Daily maintenance of steam solenoid valve

China Industrial Valves Suppliers shares that after the installation of the steam solenoid valve, it shall conduct media entry test for several times, and only after it is confirmed to be normal can it be put into official use.

Should be cleaned regularly inside and outside of the large valve and the suction surface of the dirt, pay attention not to damage the sealing surface.

When the steam solenoid valve is not used for a long time, the manual valve should be closed before the valve, and when it is reactivated, the steam solenoid valve should remove the condensed water, and make several test actions, until the switch is normal before it can be put into use.

When the steam solenoid valve is removed from the pipeline, it should be cleaned and stored with compressed air.

When use time is longer, if the seal between piston and valve seat is not good, can grind the piston sealing surface again, grind with valve seat again.

When working, pay attention to the pressure gauge before and after the valve, the working pressure shall not exceed the rated pressure, the working pressure must be in the rated pressure range. When the working pressure exceeds the rated pressure or the working pressure difference exceeds the rated pressure difference, the steam solenoid valve to stop using, close the manual valve before and after, to avoid the steam solenoid valve explosion and leakage.

That's all for the sharing, thanks for your reading, and we also supply High Temperature Ball Valves China  for sale, if you have any demand for our products, just feel free to contact us.

Notes for field use of pneumatic butterfly valve

Pneumatic butterfly valve is usually by pneumatic actuator and valve body and some accessories with the combination of installation and debugging. This paper mainly introduces the field use of pneumatic butterfly valve notes.

1. The signal valve of the control cabinet does not operate. On the premise of installing the positioner, the pneumatic regulating butterfly valve is installed with a solenoid valve after field observation.

Solution: remove the solenoid valve, remove strong electrical interference equipment normal operation (note: the function of the solenoid valve is to play the role of the valve switch, the role of the locator is to use 4 to 20 ma signal control valve opening, so there is no need to install the solenoid valve in the premise of a locator).

2, automatic switch to manual state, switch back to automatic; Because the field operator used too much force to pull the clutch, the internal gear got stuck and could not be pulled back automatically.

Solution: when the clutch is pulled, the handwheel should rotate back and forth to release the internal turbine, so as to easily achieve automatic hand switch (when the hand is automatically switched, be sure to pull up the yellow sleeve beside).

3. The valve works normally, but the feedback is always in the state of 100%. Only after communication with the field wiring personnel did we know that the field lines are thick lines, and the hard connection is not very convenient.

Solution: replace the regular screw model; It is recommended that thin lines be used for connection.

That's all for the sharing,and we supply Pneumatic Drive Type Butterfly Valve for sale, if you have any demand for our products,just feel free to contact us.

[Valve for sale China]How to select valves in the water supply network?

Cast Iron Check Valve Supplier shares that water supply pipe network is composed of pipes, valves and other pipe  accessories. According to different needs (water volume of pipe network, water  pressure scheduling and deployment, maintenance and repair of water needs, new  and old pipe line connection, pipeline flushing, etc.), every day to open and  close the valve. The service life and quality of the valve determine the normal  operation of the pipe network.

Since the pipe network is the bridge between the water supply enterprises and  the majority of users, it can be said as follows: the management of a water  supply enterprise is reflected in the normal operation of the pipe network; The  normal operation of water supply pipe network is closely related to the service  life and quality of the valve.

Safety of water supply

Not affecting water quality is an important indicator of valve selection. The  part that the valve contacts with water directly basically is valve body inside,  sealing part, valve plate to wait, at present the sealing part of the valve that  a lot of manufacturer produce USES rubber material. The commonly used rubber  materials are NBR, CR or EPDM. These rubber are synthetic rubber. Cast Iron Gate Valve China points that in the process  of synthesis, more than ten kinds of raw materials and additives such as  anti-aging agent should be added into the natural rubber. Whether the final  synthetic rubber can be used for the sealing of water supply valves must be  determined by whether the rubber is non-toxic and meets the hygienic standard of  drinking water. As to valve inside reach the place such as valve plate, a lot of  manufacturers use the method that paints in the past, consider rustproof problem  only, and do not consider toxic. In practice, we found that: in the water supply  pipe network, the pipeline lining corrosion problem has been solved, and the  pipe network valve has no lining, due to the phenomenon of water precipitation  and iron bacteria in water on the valve chamber and valve plate erosion and  deposition, resulting in some of the valve body inner wall hilly accumulation  phenomenon. It not only affects the water quality, but also is one of the main  reasons why some valves are not closed tightly. Accordingly, we ask, these and  water contact place directly, should spray avirulent coating, had better be to  use the method of electrostatic spraying to spray avirulent epoxy powder. When  we are choosing a valve, should check above all whether to have the avirulent  proof of rubber and coating and examine eligible certificate, have the valve of  afore-mentioned conditions only, ability assures water quality is not polluted,  assure the safety that supplies water.

Valve fault maintenance[Soft seal gate valve]

Soft seal gate valve fault maintenance for soft seal gate valve material, there are the following requirements shared by the Carbon Steel Stainless Steel Gate Valve China.

1. The material of valve body shall be cast iron, cast steel, stainless steel, 316L, and indicate the brand and actual physical and chemical testing data of cast iron.

2. Stem material, strive to stainless steel stem (2CR13), large diameter valve should also be stainless steel embedded stem.

3. Nut material, cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the stem.

4. Stem liner material, its hardness and strength should not be greater than the stem, and in the case of water immersion and stem, valve body does not form electrochemical corrosion.

5. Material of sealing surface

(1)Soft seal gate valve types are different, sealing and material requirements are different;

(2) ordinary wedge gate valve, copper ring material, fixed mode, grinding mode should be explained;

(3) soft seal gate valve, valve plate lining material of physical and chemical and health testing data;

6. Valve shaft packing

(1) due to the soft seal gate valve in the pipe network, usually open and close infrequently, requires the packing in a few years not activity, packing is not aging, long-term maintain the sealing effect;

(2) valve packing should also bear frequent opening and closing, long-term sealing effect;

(3) in view of the above requirements, the valve shaft packing to life or ten years do not replace;

(4) if the packing needs to be replaced, pneumatic valve design should consider the situation of water pressure replacement measures.

That's all for the sharing,we are also the Cast Iron Gate Valve Suppliers China,welcome to purchase our products!

The Selection Principle Of Pressure Reducing Valve

Following shared by Cast Iron Ball Valve China.

1. The fluctuation of the inlet pressure of the reducing valve should be controlled within 80% ~ 105% of the given value of the inlet pressure. If the range is exceeded, the performance of the reducing valve will be affected.

2. In general, the post-valve pressure Pc of the reducing valve should be less than 0.5 times of the pre-valve pressure, that is, Pc< 0.5p1. Each gear of the valve spring is only applicable in a certain range of outlet pressure, the spring should be replaced beyond the range.

3 in the medium working temperature is relatively high occasions, the general selection of pilot piston type pressure relief valve or pilot bellows valve.

4 medium for air or water (liquid) occasions, it is generally appropriate to choose direct action film type pressure reducing valve or pilot film type pressure reducing valve.

5. When the medium is steam, pilot piston type pressure reducing valve or pilot bellows type pressure reducing valve should be selected.

6. For the convenience of operation, adjustment and maintenance, the pressure reducing valve should be installed in the horizontal pipeline.

Welcome to purchase our Cast Iron Ball Valve !

Briefly Analyze The Installation Position Of Check Valve Products

Today we discuss Cast Iron Check Valve Supplier's products: installation  location. Then how to determine the location of the check valve installation?  What is the difference between pre-pump and post-pump installation of check  valves and where is pre-pump installation applicable?

Check valves are usually used with other valves. Where should they be  installed when used with other valves? Let's discuss it together.

Check valve is also called check valve, is a kind of automatic valve, it  relies on the pressure of the flow medium in the pipeline to promote the valve  disc, to achieve the closure and opening of the valve, when the medium stops  flowing, check valve disc closed, it can effectively prevent the medium in the  pipeline backflow, which plays a great role in ensuring the safety of the  pipeline.

According to the structure of the check valve, can be divided into three  types: lifting check valve, swing check valve and butterfly check valve. Lift  check valves can be divided into vertical and straight type of two.

Swing check valve manufacturers products are divided into single - valve,  double - valve and multi - valve three. Butterfly check valve is divided into  butterfly double valve, butterfly single valve, the above check valve in the  form of connection can be divided into thread connection, flange connection,  welding and clamp connection four.

Welcome to purchase our Cast Iron Check Valve !

Commonly used valve metal material(part 2)

Cast Steel Check Valve Manufacturer shares that the valve body and bonnet of common valve are cast or forged with metal  materials. Generally speaking, castings can be of complex shape and reasonable  structure, while forgings have simple shape but high strength.

1. Gray cast iron: the broken day is gray black, also known as gray cast  iron, low melting point, good fluidity, small solidification shrinkage, can be  cast complex shape and thin wall parts, cheap, but poor tensile strength, so a  lot of used to make low-pressure valve, its nominal pressure 1 6 kg/cm 2, medium  temperature 200. C. The commonly used brands are ht20-40, ht25-47, ht30-54,  etc.

2. Malleable cast iron: it has higher tensile strength, better plasticity and  toughness than gray cast iron. It is used to produce nominal pressure 25kg/cm z  and medium temperature 300. C. nominal size 100 mm valve. The commonly used  brands are kt30-6, kt33-8, etc.

3. Ductile iron: with high tensile strength, certain plasticity, toughness,  can produce nominal pressure 40 kg/cm 2, medium temperature 300. C valve. The  commonly used brands are qt45-5, qt40-10, etc.

4. Copper alloy: used for nominal pressure 40 kg/cm 2, medium temperature  200. C. Clean neutral medium is required. Due to the more expensive, generally  only for small valves. Commonly used card guides are zosnl0-1, zqai9-2,  zhlwn58-2-2, zhaj.ie-o-3-2, etc.

5. Carbon steel: casting and forging for valves; Forged valves, generally  nominal size 32 mm, larger valves are cast. Carbon steel panning door, suitable  for nominal pressure 320 kg/cm 2, medium temperature <450. C. The commonly  used brands are A3, A5, 20, 25, 35 and ZG 25, etc.

6. Cr5Mo steel; This is a chromium lead steel of good heat and corrosion  resistance, commonly used for higher temperatures but not exceeding 550. C of  the petroleum medium.

7. Lcr18h-19t1 steel: this is commonly used cr-ni-ti stainless steel, which  has good corrosion resistance to nitric acid and other media and good casting  and processing performance.

8. Crl8N112M02T1 steel: molybdenum titanium steel for short, suitable for  acetic acid and other media.

9. 12CrlMoV steel: this is a kind of chromium-molybdenum-vanadium heat  resistant steel, used for high temperature stiffness not exceeding 540. C  noncorrosive media. More power stations are used.

Welcome to purchase our Cast Steel Check Valve!

Pressure Relief Valve Can Not Be Installed In Reverse

Pressure Reducing Valve can not be installed in reverse, gas pressure  reducing valve can not be installed in reverse, steam pressure reducing valve  can not be installed in reverse, why? Why is that?

Cast Iron Gate Valve Manufacturer says that the oil inlet and outlet of the  pressure reducing valve is inversely connected, i.e. the oil inlet is connected  to the oil outlet of the pressure reducing valve; Connect the load to the oil  inlet of the pressure reducing valve. In this way, one is when the oil pressure  is lower than the pressure relief valve setting pressure, the pressure relief  valve valve is unchanged, that is, to maintain the normal open state; Second,  when the oil pressure is higher than the pressure relief valve to set the  pressure, the pressure relief valve guide valve opened, the pressure relief  valve mouth closed small, even closed, a small amount of oil through the guide  valve leakage back to the tank.

1. The valve can reduce static pressure and dynamic pressure at the same  time.

2. The basic principle of the pressure reducing valve is by the flow of the  valve on the local resistance to reduce water pressure, water pressure drop  range is connected to the disc film or piston on both sides of the inlet and  outlet water pressure difference automatic regulation, so both dynamic pressure  reduction (water flow) and static pressure reduction (flow is 0); In particular,  it can reduce pressure without affecting water flow.

3. The term "reducing static pressure" is generally inaccurate in the strict  sense, because the word "reducing" implies an energy loss and there is no energy  loss in the above static state. Therefore, in fact, the pressure reducing valve  static pressure is the use of hydraulic balance principle to make the pressure  reducing valve in the closed state to partition upstream and downstream and  maintain (or control) a lower, stable downstream pressure value.

4. The principle of dynamic pressure reduction is to make the reducing valve  in a state of energy loss and over-current. For the pressure relief valve, the  gap is automatically adjustable, unlike the pressure relief orifice (orifice  fixed), this is the adjustable adjustable type pressure relief valve, but also  in the use of pressure relief valve, before the valve, the valve after the  pressure and not too large reason.

Pressure reducing valve supplied from Cast Iron Gate Valve Suppliers China,as  an example, the system under the condition of no water OR water will not flow,  OR pressure reducing valve is closed, the valve core exports and reducing valve  inlet are separated, so the valve outlet pressure will not suffer the effect of  inlet pressure, this also explains the building Lord said P = just rho gh  problem, because the outlet pressure reducing valve and relief valve before the  valve is not relevant.