Butterfly Valve : Working Conditions,Sealing Principle and Applicable Mediums

At present, the butterfly valve has become the most widely used valve in the application field. Many people are not very familiar with the applicable occasions of butterfly valves. This article will take you to understand working conditions, sealing principle and applicable mediums of butterfly valves, so that you have a better understanding of butterfly valves.

Butterfly Valve Working Conditions

Butterfly valves are mainly used for liquid and gas low-pressure large diameter pipelines. It is suitable for occasions where the pressure loss is not high, flow adjustment is required, and the opening and closing requirements are fast; usually, the temperature is below 300 ℃ and the pressure is below 40 kg (butterfly valves generally use low pressure, like domestic ones. It is rare to achieve CL600). The medium is generally used for water and gas, and the medium is not demanding. The granular medium can also be used.

 

As a sealed butterfly valve, it brought rapid development after the emergence of synthetic rubber, so it is a new type of shut-off valve. In our country-China until the 1980s, butterfly valves were mainly used for low-pressure valves, and the valve seat was made of synthetic rubber. By the 1990s, due to increased exchanges with foreign countries, hard-seal (metal-seal) butterfly valves developed rapidly. At present, there are many valve factories that can produce medium-pressure metal-sealed butterfly valves stably, which makes the application field of butterfly valves wider.

Cast steel butterfly valve

Butterfly Valve Sealing Principle

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1. The sealing principle of a single eccentric sealing butterfly valve

Since the center of rotation of the butterfly plate (that is, the center of the valve shaft) is offset from the centerline of the valve body on the basis of the single eccentric butterfly valve, the sealing surface of the butterfly plate will be faster than the single eccentric sealing butterfly valve during the opening process. When the valve seat is separated from the sealing surface and the butterfly plate rotates to 8°~12°, the butterfly plate sealing surface is completely separated from the seat seal. When fully opened, a larger gap is formed between the two sealing surfaces. The design of this type of butterfly valve greatly The mechanical wear and extrusion deformation between the two sealing surfaces are reduced, and the sealing performance of the butterfly valve is improved.

 

2. The sealing principle of a double eccentric sealing butterfly valve

Since the centerline of the valve seat and the centerline of the valve body form a β angle offset on the basis of the double eccentric butterfly valve, the sealing surface of the butterfly plate immediately leaves the sealing surface of the valve seat at the moment of opening during the valve opening process. Only at the moment of closing does it contact and compress the seat sealing surface. When fully opened, a gap same as the double eccentric sealing butterfly valve is formed between the two sealing surfaces. The design of this type of butterfly valve completely eliminates the mechanical abrasion and abrasion between the two sealing surfaces, so that the sealing performance and service life of the butterfly valve are improved. Have been greatly improved.

 

3. The sealing principle of a variable eccentric sealing butterfly valve

The uniqueness of the variable eccentric butterfly valve is that the valve stem shaft where the butterfly plate is installed is a three-segment shaft structure. The three-segment shaft type valve stem has two shaft sections concentric, and the centerline of the central shaft is deviated from the two ends of the axis by a center distance, The butterfly plate is installed on the intermediate shaft section. Such an eccentric structure makes the butterfly plate a double eccentric shape when in the fully open position, and a single eccentric shape when the butterfly plate rotates to the closed position. Due to the effect of the eccentric shaft, when it is close to closing, the butterfly plate moves a distance into the sealing cone surface of the valve seat, and the butterfly plate matches the sealing surface of the valve seat to achieve reliable sealing performance.

 

Since the rotation center of the butterfly plate (that is, the center of the valve shaft) and the sealing section of the butterfly plate are set eccentrically, the butterfly plate sealing surface gradually separates from the valve seat sealing surface during the opening process of the butterfly valve. When the butterfly plate rotates to 20°~25°, The sealing surface of the butterfly plate is completely separated from the sealing surface of the valve seat. When fully opened, a gap is formed between the two sealing surfaces, so that the relative mechanical wear and extrusion between the two sealing surfaces of the butterfly valve is greatly reduced during the opening and closing process, thereby ensuring sealing of butterfly valves.

Cast iron rubber lined butterfly valve

Butterfly Valve Applicable Mediums

The media that the butterfly valve can transport and control are water, condensate, circulating water, sewage, seawater, air, gas, liquid natural gas, dry powder, mud, fruit pulp, and mixtures with suspended solids.

 

Butterfly valves are suitable for flow regulation. Since the pressure loss of the butterfly valve in the pipeline is relatively large, about three times that of the gate valve when selecting the butterfly valve, the influence of the pressure loss of the pipeline system should be fully considered, and the strength of the butterfly plate to withstand the pressure of the pipeline medium should also be considered. In addition, it is necessary to consider the limitation of the working temperature of the elastic valve seat material at high temperatures. The structural length and overall height of the butterfly valve are small, the opening and closing speed is fast, and it has good fluid control characteristics. The structural principle of the butterfly valve is most suitable for making large-diameter valves. When the butterfly valve is required to control the flow, the most important thing is to correctly select the size and type of the butterfly valve so that it can work properly and effectively.

1. Generally, in throttling, regulating control and mud medium, the structure length is short and the opening and closing speed is fast (1/4 revolution). Low pressure cut-off (small pressure difference), butterfly valve is recommended.

2. The butterfly valve can be used when two-position adjustment, narrow passage, low noise, cavitation and vaporization phenomenon, a small amount of leakage into the atmosphere, and abrasive media.

3. When the butterfly valve is used under special conditions, such as throttling adjustment, or strict sealing requirements, or severe wear, low temperature (cryogenic) and other operating conditions, it is necessary to use a specially designed metal seal with a triple eccentric or double eccentric adjustment device Special butterfly valve for ground.

4. The centerline butterfly valve is suitable for fresh water, sewage, sea water, salt water, steam, natural gas, food, medicine, and oil that require complete sealing, zero gas test leakage, high life requirements, and working temperature of -10℃~150℃ And various acid and alkali and other pipelines.

5. The soft-sealed eccentric butterfly valve is suitable for two-way opening and closing and adjustment of ventilation and dust removal pipelines. It is widely used in gas pipelines and waterways in metallurgy, light industry, electric power, and petrochemical systems.

6. The metal-to-metal wire sealing double eccentric butterfly valve is suitable for urban heating, gas, water supply and other gas, oil, acid and alkali pipelines, as a regulating and throttling device.

7. In addition to being used as a large-scale pressure swing adsorption (PSA) gas separation device program control valve, the metal-to-metal surface sealing triple eccentric butterfly valve can also be widely used in petroleum, petrochemical, chemical, metallurgical, electric power and other fields. It is a gate valve and a stop valve. A good alternative product.

We are a Butterfly Valve supplier, please feel free to contact us if you need them!

How To Maintain Butterfly Valve

The butterfly valve is a mechanism that regulates the flow of materials in a large pipe diameter through a quarter-turn rotation of the disc.

A rod passes through the center of the disc, and this rod is connected to a drive that controls the movement of the disc. The position of the disc is parallel or perpendicular to the flow of the medium. The butterfly valve is different from other valves because the butterfly plate is always in the fluid, resulting in pressure changes at any position of the valve.

The butterfly valve regulates the flow by starting, decelerating, or stopping the medium. The disc opens and closes with a low torque of 90 degrees, which is suitable for any compatible application. Because of their low cost and lightweight, butterfly valves are generally more popular than other types of valves.

For some processes, extreme temperatures and corrosion are factors that can easily damage the valve seal. Butterfly valves can withstand extreme cold or extreme heat. This means that the integrity of the sealing device is critical for high-risk applications such as energy production and oil processing (because a leak may threaten public safety or the environment).

Butterfly valves need regular maintenance and repair after working in different working environments for a period of time. General maintenance can be divided into minor repairs, medium repairs, and heavy repairs.

The specific analysis depends on the environmental conditions of the pipeline. Because different industries require different maintenance and repair procedures, for example, in the pipeline maintenance of petrochemical enterprises, the pipeline pressure is required to be lower than PN16MPa, and the medium temperature is lower than 550°C. Different maintenance conditions are required for various physical and chemical pipeline transportation media.

Butterfly valve

The minor repair process of various pipeline butterfly valves, including cleaning nozzles and oil cups, replacing o-rings, cleaning threads and valve stems, removing debris in the valve, tightening screws, and configuring handwheels. All of these can be used as scheduled maintenance. Medium repair: including minor repair items, replacement of clean parts, valve body repair, sanding of seals, valve stem straightening, etc. These items can be used for an overhaul in the factory. Heavy repair: Included in the mid-repair project, replacement of valve stems, repair of brackets, replacement of springs and seals. When these are needed, the butterfly valve suffers huge damage.

In order to prevent rust and oiling, butterfly valves should be properly maintained.

At the top of the valve, there is a lubricating oil fitting. This may not be observed when the valve arrives. Make sure to apply grease to the neck of the valve at regular intervals until the excess grease flows out.

In the gearbox, you can use lithium-based grease for maintenance.

You can use any silicon-based product/lubricant to easily clean all parts of the valve.

If you do not use it frequently, please try rotating or cycling the butter valve once a month.

Lugged, wafer and double flanged butterfly valves of all materials and seat types are easy to use and long lasting as long as they are installed and maintained correctly.

Storage Conditions

ㆍTo protect the seat and seals, do not unpack the valves until they are ready for installation. By doing this you are protecting the valve from dust and debris which may eventually cause seat leakage.

ㆍKeep in a cool well ventilated space if storing for a longer period of time.

Valve Installation

ㆍValves can be installed in any orientation however it is best if it can be installed upright especially in bigger sizes to reduce load on the shaft caused by the actuator or gearbox trying to pull away.

ㆍIt is common for smaller butterfly valves to be mounted in various orientations eg water trucks. This is fine and is common practice.

ㆍVerify the material of the butterfly valve, seat and disc before installation. Ensure that there are no defects caused by storage or transportation.

ㆍVerify the pressure rating of the valve vs the application requirement.

ㆍWhen installing directly to a pump or another valve be sure to have a pipe spacer between them to allow for the butterfly disc to open.

ㆍComplete all welding works before valve installation and be sure the flange has cooled to ambient temperature before installing the butterfly valve.

ㆍMake sure there is no welding residue, waste, rust or other debris in the pipe before installation. Wash with water or a mild detergent if needed.

ㆍClean the surface of the flange that will come in contact with the butterfly valve to ensure it is free of rust and debris. Wash with water or a mild detergent if needed.

ㆍMake sure there is no warpage of the flange or misalignment of the butterfly valve in relation to the flange. This is the most common cause of butterfly valve problems where it is not aligned with the flange/pipe correctly and the disc catches when trying to open/close. Support the valve where necessary to reduce load from the piping assembly.

ㆍInstall spacing bolts taking care not to damage the valve seat and adjust the face to face of the two flanges so there is space when the piping is spread open (enough space to remove the valve or replace it for maintenance).

ㆍOnce the pipes are centred, insert the bolts so that the bottom of the valve can rest upon them to prevent the valve from falling through.

Before tightening the bolts operate the valve to ensure it does not catch on the pipework or the flange.

ㆍTighten the bolts one at a time doing it in stages so even pressure is applied and a seal is formed between the valve and flanges.

ㆍOnce the installation is complete operate the valve several times to ensure it is free from impingement and it has not moved during installation.

Solder butterfly valve

Field Testing

ㆍRubber seated butterfly valves are designed to hold rated pressures only. Test pressures above rated working pressure in the closed position can cause damage to the valve.

ㆍWith the disc in the open position the pipeline can be tested up to the valve hydrostatic test pressure.

ㆍSeat leakage can occur with foreign material between the seat and disc. If this occurs open the valve 10 to 15 degrees to obtain high velocity flushing action. Close and repeat if necessary.

ㆍSeat leakage can result from a rotational shift in position of the disc in relation to the body. Readjust the closing stop on the actuator/gearbox as necessary.

ㆍFor dry applications acutator stops can be adjusted to stop the disc burying all the way into the seat. This will still allow a bubble tight seal but prolong life span of the seat.

Operation

ㆍDo not use the valve at pressures above its working pressure.

ㆍIf the valve is jammed in a position between open and closed check the actuator operation. If necessary remove the actuator and manually operate the valve to fault find. Remove and check valve for foreign objects if required (see maintenance).

ㆍExcessive torque from the actuator can damage the internal valve parts.

Maintenance

ㆍCycle the valve once a month or more if it is not used regularly.

ㆍRelieve the system pressure before maintaining the valve.

ㆍTo remove from pipework reverse the installation sequence.

ㆍReplace valve seat (liner) by removing the stem and disc. Press out liner and replace with new part. Reinstall the disc and stem along with seals and clips. Refit into line as in installation sequence.

ㆍIf the valve is operating in a dry application (eg compressed air) ensure to lubricate the disc and seat regularly to prolong life span

ㆍFor operational instructions please see each video link under products.

ㆍDesign Guidance & Product Advantages

ㆍWhen sizing the valve always consider available space for the actuator and feedback devices.

ㆍConsider valve supports to carry excess loads.

ㆍExtension shafts in SS316 are available upon request. This allows valve to be buried in pits and actuators to be above ground.

We are butterfly valve suppliers. Please feel free to contact us if you are interested in our butterfly valve or other products.

What's The Difference Between Cast Iron Valve And Cast Steel Valve

As an iron valve supplier we wholesale cast iron valves such as china cast iron gate valves. Today we are going to popularize cast iron valves and cast steel valve what is the difference.

The main difference between cast iron and steel valves is carbon content,  which directly affects steel strength and plasticity. Carbon steel is also known as carbon steel. Carbon steels generally contain a small amount of silicon,  manganese, sulfur, and phosphorus. Carbon structural steels are divided into structural steels for architecture and structural steels for machine manufacturing. Carbon steels can be divided into low carbon steels (WC less than  0.25%), medium carbon steels (WC0.25% -- 0.6%), and high carbon steels (WC>.  According to phosphorus and sulfur content, carbon steel can be divided into ordinary carbon steels (with higher phosphorus and sulfur), high-quality carbon steels (with lower phosphorus and sulfur), and high-quality steel (with lower sulfur and sulfur).

Cast iron: cast iron is an iron-carbon alloy containing more than 2% carbon

DIN Cast Iron check valve

Cast iron can be divided into 1, gray cast iron 2, white cast iron 3, malleable cast iron 4, nodular cast iron 5, vermicular cast iron 6, and alloy cast iron.

Generally speaking, the cast iron valve we use is nodular cast iron, which is obtained by spheroidizing the molten iron of gray cast iron. The precipitated graphite is spherical, referred to as ductile iron. It has higher strength, better toughness, and plasticity than ordinary gray cast iron;

Cast steel: steel used for casting castings. A type of casting alloy.

Cast steel is divided into 3 types: cast carbon steel, cast low alloy steel and cast special steel; cast carbon steel. Cast steel with carbon as the main alloy element and a small number of other elements. Casting low carbon steel with carbon content less than 0.2%, casting medium carbon steel with carbon content 0.2% to 0.5%, and casting high carbon steel with a carbon content greater than 0.5%. As the carbon content increases, the strength of the cast carbon steel increases, and the hardness increases. Cast carbon steel has high strength, plasticity and toughness, and low cost. It is used in heavy machinery to manufacture parts that bear large loads, such as rolling mill racks and hydraulic press bases. It is used to manufacture heavy stress on railway vehicles. Parts subject to impact such as bolsters, side frames, wheels, and couplers, etc.;

From the above material characteristics, cast iron is stronger than cast steel, and its brittleness is also greater than cast steel, and cast steel globe valve has better plasticity and toughness than cast iron, so cast iron is generally used In the pipeline with lower pressure, it can only be applied to the pipeline at normal temperature, because the increase in pressure or temperature means that the valve will have a certain amount of deformation, which is unfavorable for the cast iron valve, compared with the cast steel valve cast steel The valve can be used in pipelines with relatively high pressure or temperature.

The application of cast iron valves: For example, we often see valves used to transport tap water pipes. The valves are sprayed with black paint on the surface. These valves are cast iron valves.

In addition, we are also a cast iron gate valve manufacturer. If you have any professional knowledge, please feel free to contact us!

Standard for Hydraulic Control Valves

 

The hydraulic control valve is an important part of water conservancy engineering needs, related to the quality and safety of the project, hydraulic control valve is the pipeline itself medium pressure as a power source, open and close,  regulation, the leading valve, and system small pipeline different combination,  can have nearly 30 kinds of functions, now gradually get more universal use.

Pilot valves rely on as the control object of the water level and pressure changes and action, because the pilot valve type is many, can be used alone or in several combinations can make the main valve to achieve the water level and water pressure and flow, such as the function of separate or compound adjustment. However, the main valve is similar to the globe valve, when the valve is fully open, its pressure loss is much larger than other valves, and the closer the loss coefficient of each opening degree is to the full close, the greater the increase, the larger the valve diameter is more significant.

The valve with the above characteristics, in close to full closure, the action of the disc is accelerated, easy to send the water hammer (water impact pressure), close to full closure, the valve action is slower, the better, so can set throttle mechanism on the disc. In addition, the pilot valve throttling and action part should try to avoid setting a special small aperture, so as not to block. If necessary, add filter screen, periodical maintenance, and set up bypass pipeline. This kind of valve is promising for development and use.

The hydraulic control valve is a water pressure control valve, it consists of the main valve and its attached pipe, pilot valve, needle valve, Stainless Steel Ball Valve, and pressure gauge.

Use of hydraulic control valves, the first to pay attention to the selection.  Improper selection will cause water and air leakage phenomena. When selecting hydraulic control valve, the displacement of the hydraulic control valve must be selected by multiplying the equipment's steam consumption per hour by 2-3 times the maximum condensation water. In order to ensure that the hydraulic control valve can discharge condensate as soon as possible when driving, rapidly increase the temperature of the heating equipment. Hydraulic control valve discharge energy is not enough, will cause condensate can not be discharged in time,  reduce the thermal efficiency of heating equipment.

How does it work?

Flow-control valves in hydraulic systems are generally used to regulate the pressure in the flow rate of either gases or liquids as they travel through a pipeline.

Flow-control valves are extremely important for optimizing the performance of the system, so choosing the right valve for the job is likewise crucial: a flow-control valve manages the flow rate in any given portion of a system of hydraulic circuitry.

Within a hydraulic system, a flow-control valve will be used to control the rate of flow to hydraulic cylinders and motors, which in turn will impact the speed of both of those devices.

Hydraulic flow-control valves also have a secondary function of managing the energy transfer rate at a specified pressure. The most common kinds of hydraulic flow-control valves include the following designs: needle, diaphragm, butterfly, plug, and ball.

The simplest design for any flow-control valve will be one that has an aperture that can be opened or closed for the purpose of managing the flow rate. Ball valves are some of the simplest types of flow-control options, and these consist of a ball that is attached to a simple handle.

Since the ball has a hole through its center, when the handle is turned, the ball’s hole is aligned with valve openings so that fluid-stream becomes possible.

When it’s desired to reduce or shut off the flow, this handle can be used to position the ball perpendicular to all of the valve openings, which effectively blocks the fluid. Most other flow-control valves operate in a similar way, i.e. they provide some mechanism for either allowing flow to take place or blocking it.

When assembling hydraulic circuitry, there are a number of options possible for controlling flow, and these can range from the very basic to ultra-sophisticated controls managed by electronics. The most complex of these options are able to detect pressure changes and make appropriate responses, or they are capable of monitoring flow rate and making the correct response when that rate goes beyond a predefined threshold.

How to choose a hydraulic control valve

When choosing a hydraulic control valve, the hydraulic control valve cannot be selected with nominal pressure, because nominal pressure can only mean the hydraulic control valve shell to bear the pressure class, hydraulic control valve nominal pressure and working pressure are very different. So according to the working pressure difference choose the hydraulic control valve displacement. Working pressure difference refers to the difference between working pressure before the hydraulic control valve and backpressure at the outlet of the hydraulic control valve.

The choice of hydraulic control valve requires accurate steam drainage resistance, high sensitivity, can improve the utilization rate of steam, no leakage of steam, reliable performance, high back pressure rate, long service life, easy maintenance is the preferred condition.

The hydraulic control valve is a use of water self-embellish valve body, without adding oil lubrication, such as the main valve parts damaged, please according to the following instructions for disassembly. (note: the commonly consumed  damaged products in the inner valve are diaphragm and type ring, and few other  internal parts are damaged)

1. First close the Stainless Steel Gate Valve at the front and rear ends of the main valve.

2. Loosen the coupling screw on the main valve cover to release the pressure in the valve.

3. Remove all screws, including nuts for necessary copper pipes in the control line.

4. Remove bonnet and spring. 5. Remove the shaft core, diaphragm, piston,  etc. Do not damage the diaphragm.

6. After taking out the above items, check whether the diaphragm and type ring are damaged; If there is no damage, do not fight for the internal parts by yourself.

7. If damage is found to the diaphragm or the molded coil, loosen the nut on the shaft core, decompose the diaphragm or the molded coil step by step, remove and replace it with a new diaphragm or the molded coil.

8. Inspect the inner valve seat and shaft in detail to see if there is any damage. If there is any other debris inside the main valve, clear it out.

9. Assemble the replaced parts and components in the reverse order and install the main valve. Note that the valve should not be stuck.

Industrial Valves Market Analysis: Characteristics and Applications of 9 Types of Valves

Industrial valves are mechanical devices that open, close, or partially block channels to regulate the flow of liquids or gases in a system. the global industrial valves market size was USD 73 billion in 2021 and is expected to reach USD 90.5 billion by 2026, and is projected to grow at a CAGR of 4.4% during the forecast period. Increasing demand for valves in healthcare and pharmaceutical industries due to the COVID-19 pandemic, the surge in demand for setting up new nuclear power plants and retrofitting existing ones, increasing demand for maintenance of connected networks and monitoring of industrial equipment, growing adoption of automation technologies in process industries, and growing focus on the development of smart cities across the globe are the key drivers of the industrial valves market.

There are many industrial valve manufacturers across the globe. They produce various types of industrial stock valves, each with unique features and applications, and it can be challenging to find one that will provide the best results in your particular application. As applications have become more specific and complex, valves have evolved into nine main types to suit different requirements. These nine types cover all industrial applications and services.

 

1. Gate valve

Gate valves are designed to be used as isolation valves. These valves help to control the flow of liquid through the pipeline. In order to start or stop the flow of water or any other type of liquid, these valves are fixed to the pipeline. Gate valves are used for various purposes and are commonly found in homes and commercial centers. Different materials such as stainless steel, cast iron, alloy steel, forged steel, etc. are used to manufacture these valves. Gate valve suppliers classify gate valve types into two main types: parallel and wedge valves.

 

Gate valves are used to stop or start the flow of water. The function of a gate valve includes lifting the round shape of a rectangular gate out of the fluid path. When the gate valve is open, there is nothing to impede the flow because the pipe diameter and the gate have the same opening. The valve size can be determined by this orifice diameter.

 

Advantages

- Gate valves have very low frictional losses

- They can be used in both directions in the circuit

- They provide laminar flow with minimal pressure loss

- Gate valves help save energy and reduce the total cost of ownership

Will have low-pressure drop when fully open and seal tightly

 

Applications

Gate valves are excellent shut-off/open valves for any application. They are suitable for wastewater applications and neutral liquids. Gases with a temperature range between -20°C and 70°C and a maximum pressure of 16 bar can be used with gate valves. Knife gate valves are used for slurry and powder media. 2.

 

Related news: The Working Principle And Features Of Cast Iron Gate Valve

2. Globe valve

Globe valves are one of the most popular types of valves for a variety of applications. These valves are similar to gate valves and use linear motion to throttle the flow. They are used to control the flow in the pipeline and are regulated by the position of the movable disc (or plug) relative to the fixed ring seat. The main advantage of a globe valve is that it does not leak like other valves.

 

A Globe valve consists of baffles that separate the inside of the pipe, which is usually parallel to the length of the pipe. They are named after their spherical body shape, with the two halves of the body separated by an internal baffle. It consists of a removable disc element and a fixed ring seat located inside a roughly spherical body.

 

Stop valves are available in three body designs: Z-body, Y-body, and angle valves, and three designs of valve plates: ball, composite, and plug.

 

Advantages

- Stop valves throttle the flow and have a good full shutoff.

- Shorter opening and closing times.

- Easier surface preparation of the valve body seat.

- They can be used as shut-off check valves.

- They contain positive shutoff

 

Applications

Shutoff valves are suitable for a variety of applications because of their ability to stop, start, and regulate flow. Typically, you will see them used for regulatory capacity, including but not limited to fuel systems, boiler and main steam vents and drains, and cooling water systems.

Related news: Gate Valve vs Globe Valve

 

3. Ball Valves

Ball valves are valves that use a ball to control the flow of material from one opening to the next. These valves work by allowing the orifice to open, block or partially open to regulate the flow of gas/liquid. Ball valves are ideal for use with gases because they provide a better seal. They are very versatile as they support pressures up to 700 bar and temperatures up to 200°C and typically range in size from 0.5 cm to 30 cm. They are simple in construction and easy to operate and maintain.

 

They are designed with special measures to allow only the 90-degree rotation required to open and close the ball valve. These valves are a remarkable industrial choice because they provide a reliable and gas-tight seal in a closed position.

 

Types of industrial ball valves include

CSA gas ball valves: Gas ball valves are a special type of ball valve that requires CSA (Canadian Standards Association) certification for safe use incombustible gas applications. Valves that are CSA certified have undergone rigorous quality testing in accordance with U.S. law and measures established by other independent organizations (UL, ANSI, NSF, etc.).

Express/EzGrip Ball Valves: EzPress and EzGrip ball valves are ergonomically designed to be easily and quickly activated or deactivated in industrial applications. These valve connections are designed to save time and money during installation.

PEX Valves: PEX valves are two-way, full-way, right-angle rotary valves most commonly used to shut off the water supply to plumbing fixtures and other equipment during repair or maintenance service. f-1960, f-1807, and Everloc + are the most common types of sex connections.

PP-R Valves: PP-R valves are designed to be compatible with PP-R piping, which is a straight, rigid, cylindrical pipe used to transfer a variety of fluids in industrial applications. the polypropylene composition of PP-R piping and valves makes them highly resistant to corrosive chemicals and abrasive particles. The system uses hot welding and electrofusion to make socket and butt weld connections.

 

Advantages

- They incorporate a compact and low-maintenance design that requires no lubrication

- Cost-effective among all valves

- The biggest advantage of ball valves is their poor throttling characteristics, which can cause the ball valve seat to be susceptible to erosion.

- They provide leak-proof service.

- They can be opened and closed quickly.

- Ball valves offer multi-way design flexibility.

 

Applications

Ball valves are commonly used in flow systems for ships, fire protection services and in the chlorine manufacturing industry. Ball valve suppliers say these valves can be used in a variety of applications and markets, such as gas processing, transmission and storage, and industry.

Related news: Advantages Of Brass Ball Valve

 

4. Butterfly Valves

Butterfly Valves Butterfly valves are designed to regulate flow but have limited control. The butterfly valve can be easily operated by turning the handle 90 degrees. It consists of a metal disc in the valve body positioned perpendicular to the fluid in the closed position. The flow of fluid can be regulated by rotating it in the middle. Butterfly valves are configured for electric, manual or pneumatic operation.

 

Butterfly valve suppliers say these valves are used in a wide range of applications such as water supply, wastewater treatment, fire and gas supply, as well as in the chemical and petroleum industries, fuel handling systems, power generation, etc. These valves can be operated by a handle, gear, or actuator depending on specific needs.

 

Advantages

- Butterfly valves are very precise, which gives them an advantage in industrial applications.

- They are very reliable and require little maintenance.

- They have the ability to throttle the flow.

- They can be installed or removed without dislocating the piping system

 

Applications

Butterfly valves are used in wastewater treatment plants, power plants and processing plants for shut-off regulation and isolation services, and are particularly popular in oversized diameter pipelines.

Also used in pharmaceutical, chemical and food processing

They are used for corrosive fluids at low temperatures and pressures.

Related news: Butterfly Valve Introduction Guide

 

5. Check Valves

Check Valves Check valves are also known as non-return valves (NRVs). They allow liquid to flow in one direction only and prevent the medium from flowing back in the opposite direction. The purpose of a check valve is to prevent process reversal in a system, which could damage equipment or disrupt the process.

 

They are typically used to protect pumps in liquid applications or compressors in gas systems where backflow may cause the pump or compressor to shut down. The basic design of check valves reduces backflow in the line.

 

Because of their simpler design, they can operate without human interaction and automation. They rely on the flow rate of the fluid to open and close. The higher the flow rate, the more the valve opens until it reaches its maximum fully open position.

 

Types of check valves include

Lift check valves: With lift check valves, the ball or piston opens at a specified pressure to allow fluid flow. A decrease in pressure will force the piston or ball into the seat, which closes the valve and prevents backflow.

Swing check valves: Swing check valves rely on an articulating disc that swings away from the seat to allow forward flow. If the upstream flow is stopped, the valve flap returns to the seat to prevent backflow.

Butterfly Check Valves: Butterfly check valves consist of two semi-circular gates hinged together. Forward flow pushes the gate open, while reverse flow retracts them.

 

Advantages

Simple design.

Effective in preventing backflow.

Can be used as a backup system.

 

Applications

Check valves are used in applications where backflow prevention is required, such as pumps and compressors. Check valves are commonly used for feed pumps in steam boilers. Check valves are also used in chemical plants and power plants with multiple processes. Check valves are also used when there are multiple gases in a pipeline.

Related news: Common Types Of Check Valves

 

6. Needle Valves

Needle valves are named for the needle-like shape of their discs. Needle valves have a long, conical needle-like point for relatively fine adjustment of fluid flow. They are sometimes used as components of other valves because the needle allows the size of the fluid flow opening to change gradually. The mechanism of action is similar to that of a globe valve. Needle valves provide greater precision and control in smaller piping systems. Still part of the quarter-turn series, needle valves function better at low flow rates.

 

Advantages

Efficient control of fluid media, suitable for finely regulated flows.

Ideal for vacuum service or any system requiring precision.

Minimal mechanical force is required to seal the valve.

 

Applications

Needle valves are used in instruments that require more complete control of fluid fluctuations and more precise fluid flow. Needle valves are more commonly used in calibration applications. They are also associated with distribution points in piping systems where needle valves are used as regulators of the media.

 

7. Pinch Valves

Pinch valves, also known as pinch valves, are another type of valve used for stop/start and throttling. A pinch valve consists of a sleeve molded from rubber or other synthetic material and a pinch mechanism. The pinch mechanism (stem or gate) is lowered onto the valve body to shut off the flow through the system. Pinch valves are part of the linear motion valve family. Linear motion allows the medium to flow unobstructed. The clamping mechanism of the clamping tube inside the valve serves to control the flow of fluid.

 

Advantages

Simple design with no internal moving parts.

Ideal for slurries and thicker, even corrosive media.

Helps prevent media contamination.

Low maintenance costs.

 

Applications

Pinch valves are primarily used for unrestricted fluid flow. They are best suited for slurry applications. Pinch valves are ideal for applications that require complete isolation from valve components and environmental contaminants.

Other applications that use pinch valves include wastewater treatment, chemical treatment, cement handling, etc.

 

8. Plug Valves

A rotary motion valve is used to stop and start fluid flow. Plug valves are part of the angle travel valve family. The disc acts as a gas-tight shutoff device and is located on a plug or cylinder. Due to its conical end and appropriately named plug valve. Its closing and opening mechanism is similar to that of a ball valve. The disc is a solid conical or cylindrical plug with a bored passage at right angles to the longitudinal axis of the plug. When open, the plug is aligned with the inlet and outlet of the valve body. The plug is either round or cylindrical with a taper.

 

Advantages

Simple mechanism.

Easy in-line maintenance.

Low-pressure drop.

Reliable, tight-sealing capability.

Quick opening or closing with just a quarter turn.

 

Applications

Plug valves are effective in tight closing and opening valves. There are many applications that use plug valves. These include natural gas pipelines, slurries, applications containing large amounts of debris, and high temperature and pressure applications.

These valves are well suited for wastewater systems. Plug valves are also well suited for highly abrasive and corrosive media because there is no contact between the media and the internal valve components.

 

9. Pressure Relief Valves

A pressure relief valve is a valve that relieves or limits pressure in a pipeline to maintain pressure balance and avoid buildup. It is sometimes mistakenly referred to as a pressure safety valve.

 

Its primary purpose is to protect equipment in the event of an overpressure event or to increase pressure in the event of a pressure drop. There is a predetermined pressure level and if the latter exceeds the preset level, the valve will release additional pressure.

 

Advantages

Can be used in all types of gas and liquid applications.

Can also be used for high pressure and high-temperature applications.

Cost-effective.

 

Applications

Pressure-reducing valves are effective when backpressure is not a major consideration. Pressure-reducing valves can be seen in boiler applications and pressure vessels.

 

In summary - choosing the right valve for your piping system

These are the 9 types of valves used in industry today. Some act as tight protection against leaks, while others make great throttling valves. The most important question to ask yourself when looking for a valve is what do you need the valve to do? Valves are an important use in any piping system. Whatever the requirements of your system, there is always a valve that will serve that purpose. By understanding each valve, it becomes easier to learn how to apply them to your industry. Industrial valves can be purchased from manufacturers worldwide at affordable prices.

 

Are you looking for industrial valve manufacturers and valve suppliers for your business pipeline? Yuanda Valve is the world's leading valve manufacturer and supplier. We have different types of industrial valves such as check valves, control valves, fire valves, etc. Our valves are excellent in terms of packaging, dispatching and after-sales services and our uncompromising quality makes buyers contact us for future transactions. For more information, view www.yuandavalves.com.