Blog

11

2018

/

04

Causes and solutions of electric actuator vibration

09

2018

/

04

Forged steel globe valve three kinds of body cover connection design form

Forged steel cut-off valve has three kinds of body cover connection design: the first is the body cover bolt connection forged steel cut-off valve, according to this connection form of the design of the valve, the valve body and the valve cover with bolts, winding gasket seal, the advantage is easy to repair. The second kind of body cover welding connection forged steel globe valve, according to this connection form design of the valve, the valve body and the valve cover full welding seal, the advantage is no external leakage. The third is the pressure self-tightening valve cover forged steel globe valve, according to this connection form design of the valve, the valve body and the valve cover with screw mosquito connection, internal pressure from the sealing ring seal, the advantage is that the greater the internal pressure, the better the sealing performance. You can according to the actual

29

2018

/

03

Cleaning steps and assembly requirements for degreasing valves

1. Cleaning steps for valve degreasing: valve degreasing parts must go through the following processes before assembly: 1) according to processing requirements, some valve parts need to be polished, and the surface should not have processing burrs, etc.; 2) Degreasing treatment for all valve parts; 3) Pickling passivation after degreasing (the cleaning agent does not contain phosphorus);4) Rinse with purified water after pickling passivation, there should be no drug residue (this step is omitted for carbon steel parts);5) each valve parts should be dried with non-woven fabric, and the surface of the retained parts such as wire wool should not be dried, or blow-dried with clean nitrogen; 6) Use non-woven fabric or precision filter paper

26

2018

/

03

Several major technical characteristics of fully welded ball valve

1. The valve body structure is integrally welded, and there will be no external leakage. 2. The valve seat is composed of PTFE sealing ring and spring, which has strong adaptability to changes in pressure and temperature, and will not produce any leakage within the scope of use. 3. The anti-leakage structure of the valve stem has a PTFE self-sealing gasket and an O-ring at the bottom of the valve stem. There are two O-rings and two PTFE gaskets on the valve stem to ensure no leakage. 4. The valve body material is the same as the pipe material, and there will be no uneven stress, nor will it be squeezed and deformed due to earthquakes and vehicles passing through the ground. 5. The valve body is light and easy to keep warm. 6, directly buried ball valve can be directly

23

2018

/

03

Valve electric device is an indispensable equipment

Valve electric device is to achieve the valve is now controlled, automatic control and remote control indispensable equipment, the movement process can be controlled by the size of the stroke, torque or axial thrust. Since the working characteristics and utilization of the valve electric device depends on the type of valve, the device work specification and the position of the valve in the pipeline or equipment, the correct selection of the valve electric device is essential to prevent overload phenomenon (working torque is higher than the control torque). Valve electric device of its special requirements, that must be able to limit the torque or axial force. Usually the valve electric device uses a torque-limiting coupling. When the specification of the electric device is determined, its control torque

21

2018

/

03

Preventive Measures for Leakage Steam of Valve

How to deal with valve leakage, leakage of steam, we must first understand why there is leakage, leakage of steam, know it and know why. Valve to maintain air tightness, must have a good seal. If there is a problem with the seal, there will be air leakage. As a control component in the fluid conveying system, the valve has the functions of cut-off, regulation, diversion, prevention of countercurrent, pressure stabilization, diversion or overflow pressure relief. It is an indispensable control component for many industrial and mining industries. Once the valve fails, especially The leakage incident will not only affect the stable operation of industrial and mining equipment, but may even harm the environment and cause immeasurable economic and social

19

2018

/

03

Fault performance and maintenance method of one-way valve

The failure of the one-way valve is always on and always off in two forms. Always on will cause refrigeration normal, but the compressor running time is too long. Always cut off will cause the refrigerant not to flow, not cooling. The common faults of the one-way valve mainly include blockage, lax closing, leakage and so on. Check valve maintenance method When the nylon valve body in the valve is dirty and does not move, or the bypass capillary integrated with it is also dirty and blocked, it will cause poor cooling or heating effect, or even no cooling or heating. For this kind of fault, a new one-way valve of the same type is used to replace the fault valve. At the same time, nitrogen must be filled after cleaning the refrigeration system.

18

2018

/

03

Troubleshooting Method of Soft Seal Gate Valve

The soft sealing gate valve uses compressed air as its power, and the club drives the ball to rotate 90 degrees to realize the full opening-full closing action. Its supporting the use of accessories have air filter valve, limit switch, solenoid valve. Among them, the main function of the air filter pressure reducing valve is to stabilize the pressure and filter the impurities and water vapor in the air. The valve is used for a certain period of time the frequent failure is leakage. The following is a brief introduction to the common faults of the valve and the corresponding maintenance methods. For the soft seal gate valve leakage mode, the common are the following: 1, the cylinder on the solenoid valve leakage, may be due to the pressure reducing valve in the pressure is too high. 2. The exhaust hole of the cylinder leaks

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