Ball Valve Structure Improvement And Grinding Tool Design

 

The X-shaped seal ring is now widely used in the sealing of ball valves of all pressure levels. X-shaped seal ring has a sealing surface all around, and there are lubrication grooves outside the sealing ring. This structure is superior to the O-ring. Its advantages are low installation accuracy, good reliability, no maintenance, low price, and the ability to adjust the compression amount through the gasket. It can effectively prevent the occurrence of leakage. Greatly prolong the service life of the ball valve and improve the reliability of the valve.

 

1. X-shaped sealing ring material

 

X-shaped seal material using polyurethane (CPU) material can effectively solve the problems that exist in the traditional O-shaped seal ring. Cast polyurethane is a kind of sealing material that is adopted internationally now. Its elastic modulus is large, its physical and mechanical properties are good, and it can bear a large impact load, and the polyurethane has basically solved the problem of hydrolysis resistance, and the temperature resistance level is being improved, which greatly expands the application field of polyurethane. The production of an X-shaped seal with cast polyurethane is a simple process with a low manufacturing cost. Its pressure resistance level can reach 60MPa or even higher, and the pressure retention effect is also quite good, basically reaching zero leakage.

 

2. Abrasive design

 

Ensure that the product use requirements, in line with the design requirements;

 

Easy to release and clear the mold, easy to operate;

 

Low manufacturing cost;

 

The grinding tool material is 45 steel;

 

The shrinkage rate is designed according to 1.5%~1.7%;

 

10° slope positioning without flying edge, product accuracy is guaranteed, high yield rate;

 

The grinding tool is composed of the upper die, inner die, and outer die.

 

3. Ball valve sealing principle

 

The grinding tool is composed of the upper die, inner die, and outer die.

 

5. Packing cavity size

 

The packing cavity decides the number of material transfers according to the pressure and bore size of the ball valve, and the width is decided by the size of the shaft. Pressure 0.6 ~ 2.5MPa, DN250mm below prevent an X-shaped seal; 2.5 ~ 10MPa, DN300 above the placement of two X seals. The packing cavity size depth is determined by the height of the transfer pad, pressure transfer ring, and X-shaped seal ring.

4. Pressure transfer ring

 

The pressure transfer ring is set at high pressure and large diameter, it is installed between two groups of X-shaped seal, its main role is to transfer the pressure above, change the X-shaped seal state so that the X-shaped seal is stressed and radial deformation, to achieve sealing performance.

 

6. X-shaped seal ring force analysis

 

X-shaped seal ring force is transmitted to the X-shaped seal ring through the pressure ring (packing gland) pressure, the bottom of the seal ring has a support ring (packing gasket) three points of force way, the shaft and valve hole sealing surface force uniform, you can get a more ideal sealing effect.

　

7. Finite element analysis of X-shaped seal

 

The X-shaped seal ring is a lip-shaped seal ring, is used in combination with a pressure ring (packing gland) and support ring (packing gasket), it can effectively stop the media leakage.

 

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How To Avoid Pressure Instability Caused By Strainer Valves?

 

Troubles related to pressure oscillation on a consumption-site basis such as showers and also faucets in structures are commonly related to a pressure control valve since it is typically the only point in the system that has a manometer that allows the verification of this oscillation. However, oscillations revealed upstream of pressure decreasing valves might really stem from the pressure control valve gravel trap or strainer.

Preferably, a Y strainer should develop a small sufficient pressure decrease to preserve compatibility with the style pressure of the factor where it is installed. To stay clear of too much pressure loss and also subsequent pressure surges in the system, strainers need to get routine upkeep. It is a great concept to clean and check pressure control valve strainers whenever the top reservoirs undergo cleansing or upkeep.

In order to secure the PRV from debris that may move in the pipe and disrupt its procedure, a stress reduction terminal needs to include a strainer that is mounted on the upstream side of the PRV.

The following are some feasible reasons for too much stress loss at the strainer site:

 

Exceedingly fine or perforated strainer displays

A strainer with a display that is too great can easily connect up and also obstruct water flow, triggering a pressure drop. Our recommendation is that the strainer quality in Y kind strainers ought to be at least 0.5 mm.

A mesh strainer screen is far preferable to a perforated sheet strainer screen. Since the number of openings in a perforated strainer is a lot smaller sized, a 0.5 mm perforated strainer will commonly stop working to acquire the flowability needed to keep adequate stress in the pipeline. The following is a comparative photo of strainer screens with the opening percent of each.

Lack of strainer upkeep

Even an appropriately sized strainer can block if it is not correctly kept. As the pictures listed below demonstrate, it is not uncommon for significant blockages to be performed supply pipes and lodge in the strainer. Partly or totally clogged strainers concession water flow, which can result in solid pressure oscillations in the system.

Strong pressure oscillations are especially likely to take place when there is a rise in usage need. While the stress control valve itself will certainly have a modulating impact, when the stress loss lies in the strainer, it might endanger the outlet stress of the valve.

 

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A Guide to a Strainer Valve

 

What is a strainer valve?

A strainer valve can be specified as a pipe installation whereby fluid is masqueraded purification, filtering, or separation from strong matter; anything made use of to stress a fluid; any type of device working as a screen or filter made use of to avoid solid bodies from mixing in a liquid stream or circulation line. Filters arrest pipe particles such as scale, rust, jointing substance, and also weld metal in pipes, protecting equipment and procedures from their hazardous effects, hence lowering downtime and also upkeep.

 

Types of strainer valves

Strainers can be categorized right into 2 primary types according to their body setup: Y-type as well as T-type (or basket type).

 

Y-type Strainer

A Y-type strainer valve takes its name from its arrangement as well as is most typically used in pressurized lines, gas, or fluid. They can additionally be utilized in suction or vacuum conditions. Y-Strainers are intended for applications where percentages of strong particulate are anticipated and where clean-out will certainly be seldom. If solids are flushed easily from the screen, as well as the liquid can be exhausted to the ambiance, a blow-down valve on the drain port will certainly permit clean-out without elimination of the display and also without interrupting the process flow.

 

A Y-type strainer has the advantage of being mounted in either a straight or upright position. Obviously, in both situations, the testing component has to get on the drawback of the strainer body so that the entrapped product can be correctly gathered in it.

 

In straight heavy steam or gas piping, a Y-type strainer ought to be installed in such a fashion so that the pocket is in the horizontal plane. This stops water from gathering in the pocket which can create erosion and impact warm transfer procedures.

 

In liquid systems, the pocket ought to aim vertically downwards. This makes certain that the gotten rid of particles are not drawn back right into the upstream pipework during reduced circulation problems.

 

Although it is suggested to install strainers in straight lines, this is not always possible, and they can be set up in vertical pipes if the circulation is downwards, in which instance the debris is naturally guided right into the pocket.

 

Some manufactures decrease the dimension of the Y -Strainer body to save material as well as cut the price. Before installing a Y-Strainer, make sure it is big sufficient to effectively handle the flow. A discounted filter might be an indicator of an undersized unit.

 

T-type or Basket Strainer Valve

T type or basket type or pot type strainer is specified by a vertically related chamber, normally larger than that of a Y-type strainer. Dimension for size, the stress drop throughout a basket strainer is less than that throughout the Y-type as it has a better complimentary straining area, which makes the basket type filter the preferred kind for liquid applications. As the dust holding ability is additionally higher than in Y-type strainers, the basket type strainer is additionally utilized on larger diameter heavy steam pipelines.

 

Basket strainers can only be set up in horizontal pipes, and for bigger, heavier basket strainers, the base of the strainer requires to be supported.

 

To service a basket type strainer, the cover can be gotten rid of so specialists obtain instant accessibility to the filtering element if it requires a substitute (because of accumulated debris). When basket type strainers are made use of on heavy steam systems, a substantial amount of condensate may be formed. As a result, strainers designed for use in steam systems normally have a drain plug, which can be fitted with a heavy steam catch to remove the condensate.

 

Distinctions between Strainer Valves and Filters

A filter is a device that gets rid of fragments from a liquid or gas. It consists of a disposable medium to remove bits of specified micron dimensions. All strainers are filters, yet not all filters are strainers. A filter is only one sort of filter. A strainer valve uses a perforated plate or screen mesh to eliminate bigger bits from a procedure stream. The significant advantage of a Filter is that it is reusable. The filter display is only made use of as soon as and needs to be altered when it is blocked.

 

The main distinction seems to be in the size of the holes in the media display also described as mesh dimension when it comes to the strainer. There is no hard and fast size department to define filters from filters.

 

An additional distinction is a resistance. Strainers usually present reduced resistance to fluid circulation. The pressure decrease throughout most filters is reasonably little contrasted to the stress decline throughout thick media filters or membrane filters.

 

Lastly, is their feature. A strainer is used to secure various other downstream devices from damage by rogue scrap. A filter is utilized to divide particles from the liquid.

 

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What Is a Brass Ball Valve?

 

A brass ball valve is an alloy of copper and zinc. If the brass is only made up of copper and zinc, it is called plain brass. Brass is often used in the manufacture of valves, water pipes, connecting pipes for internal and external air conditioning units and radiators.

 

Why are ball valves made of brass?

Brass ball valves are made of cast iron, brass, carbon steel, stainless steel, alloy steel, PVC, ABS, and other materials, brass ball valves are generally used for household water pipes or gas pipes on low-pressure small diameter valves, the manufacturing process is simple, inexpensive, brass than the price of steel is high, lower than the price of stainless steel.

 

Brass ball valve working principle

The brass ball valve is an evolution of the plug valve. It has the same rotating 90-degree action, the difference is that a ball valve is a sphere with a circular through hole or passage through its axis. The ratio of the sphere to the passage opening should be the same. That is, when the ball is rotated 90 degrees, it should have all spherical surfaces at the inlet and outlet, thus cutting off the flow. The ball valve can be closed tightly with only 90 degrees of rotation operation and very little rotating torque. The completely equal valve body cavity provides the medium with very little resistance and a straight flow path.

 

Brass ball valve features and applications

 

Features: The main feature of the ball valve is its own compact structure, small fluid resistance, full diameter ball valve basically no flow resistance. Seal reliable, simple structure, small volume, lightweight, easy maintenance, sealing surface and the spherical surface is often in a closed state, not easy to be media erosion, easy to operate and repair, suitable for water, solvents, acids, and natural gas and other general working media, but also for harsh working conditions, such as oxygen, hydrogen peroxide, methane, and ethylene, etc., various industries are widely used, fully open or fully closed, the ball and seat sealing surface and When fully open or fully closed, the ball and seat sealing surface is isolated from the medium, the medium will not cause erosion of the sealing surface of the valve when it passes through, the range of application is wide, the passage diameter is from small to a few millimeters, large to several meters, from high vacuum to high pressure can be applied. The ball valve body can be integral or combined.

  

Application: 

The brass ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. The ball valve designed as a V-shaped opening also has a good flow adjustment function. Used in chemical, petrochemical, petroleum, paper, mining, power, liquefied gas, food, pharmaceutical, water supply and drainage, municipal administration, mechanical equipment, electronics industry, urban construction and other fields.

 

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What Is a Check Valve?

Check valves are usually installed in the pipeline to prevent backflow. A check valve is basically a one-way valve in which the flow can flow freely in one direction, but if the flow turns, the valve will be closed to protect the piping, other valves, pumps, etc. If the flow is diverted without a check valve installed, a water hammer may occur. Water hammer often occurs with extreme force and can easily damage pipes or components.

What is a water hammer?

In a pumping system, water is forced from a lower water level to a higher water level by the pump. Only when the pump is running, the fluid will flow in one direction. When the pump stops, the flow of fluid will decrease until the pump also stops. Because the entire pipeline will rise, when the fluid stops, it will return to the pipe. To prevent the fluid reversal from entering into the pump, well, or water inlet, a check valve is installed.

In many cases, the fluid reversal rate is not a concern, and the performance of standard check valves is also very good. However, in a pumping system, rapid backflow may occur, and it is critical to choose the correct check valve.

If the pump stops before the check valve is completely closed, and the forward fluid flows back into the pipeline to the pump, the fluid will force the valve door to hit its valve seat. In this case, the backflow can be stopped almost instantaneously, and it is this instantaneous stop that causes the water to hammer in the pipeline. This may produce a huge hammering noise. This is not the noise when the valve enters the seat position, but the stretching of the pipe under these conditions.

Check Valve

The ensuing pressure wave (surge) can cause considerable damage to the system, including pipe cracks, bursts, cavitation, and implosion due to the formation of vacuum pressure. It should also be noted that these failures may not be caused by a single, large impact pressure, but by repeated impacts that ultimately lead to system fatigue failure.

It is worth noting that in order to ensure that the system is safe and trouble-free, other factors need to be considered. The correct number, type, and size of air valves, closing and opening times of isolation valves, flow control valves, etc. all need to be considered to protect the system from pressure surges.

In order to prevent the occurrence of a check valve slam, the valve should be closed very quickly to prevent the onset of reverse flow or very slowly when reverse flow occurs. In order to close the check valve slowly, additional auxiliary equipment, such as a hydraulic damper, is needed to cushion the valve when it enters the seated position. However, this slower closure does allow fluid to pass through the check valve until the check valve closes, and the upstream pump must be considered to ensure that it is suitable for reverse spin and flow.

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