1.Check the valve line on the valve plug and the valve seat, it should be in good condition, and there is no defect that affects the sealing effect. If there is a slight defect, the grinding method should be used to eliminate the grinding method; if ...

The throttle valve is used to adjust the flow of the medium in the equipment and the pipe. The working principle is mainly to change the flow passage area between the valve core and the valve seat to achieve the purpose of regulating the flow. The st...

Control valve leakage test method Type A test method 1.1 The test medium is a cleaning gas (air or nitrogen) or a liquid (water or kerosene) at 5 ° C to 40 ° C. 1.2 The test medium pressure is 0.35 MPa, and the specified allowable pressure difference...

The electric butterfly valve is a valve that uses a circular disc as a starting and closing member and rotates with the valve stem to open, close and adjust the fluid passage. The butterfly valve is not only simple in structure, small in size, light ...

When some media that are easy to precipitate and contain solid particles are adjusted by ordinary valves, they are often blocked at the throttle and guide, and the gas and steam can be flushed at the bottom of the lower bonnet. When the valve is bloc...

The flow-opening type flows toward the opening direction, and the cavitation and erosion mainly act on the sealing surface, so that the sealing surface of the valve core and the valve seat is quickly damaged; the flow-closing type flows toward the cl...

PVC It is polyvinyl chloride plastic with bright color, corrosion resistance, firmness and durability. Due to the addition of some toxic auxiliary materials such as plasticizers and anti-aging agents in the manufacturing process, its products general...

By increasing the diameter of the valve to increase the working opening, the specific methods are as follows: 1. Change the valve of a small first diameter, such as DN32 to DN25; 2. The valve body does not change, replace the valve with small valve s...

1. Large opening work extended life method Let the regulator work as far as possible at the maximum opening, such as 90%. Thus, cavitation, erosion, and the like occur on the head of the spool. As the spool is broken, the flow rate increases, and the...

The action of the regulating valve is unstable. The symptoms and causes are as follows: 1. The air source pressure is unstable. A. The compressor capacity is too small; B. The pressure reducing valve is faulty. 2. The signal pressure is unstable. A. ...

1. Leakage of valve body and bonnet ► Reason: 1. The casting quality of iron castings is not high, and there are defects such as blisters, loose tissues, slag inclusions on the valve body and bonnet body; 2. Day freeze cracking; 3. Poor welding, ther...

When the regulating valve is made of graphite-asbestos, the lubricating oil should be added to the packing for about three months to ensure the flexibility of the regulating valve. If it is found that the packing pressure cap is pressed very low, the...