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...

The cut-off valve, also called the cut-off valve, is the most widely used valve, which is mainly composed of a valve body, a valve clack, a valve cover, and a valve stem. The valve body and valve cover are pressure-bearing parts, and the valve clack ...

Pneumatic control valve is one of the widely used instruments in petrochemical enterprises. Its accurate and normal operation is of great significance to ensure the normal operation and safe production of the process equipment. Therefore, it is neces...

The body material of the desulfurization butterfly valve is: ductile iron, cast steel, stainless steel, etc. From the cost considerations, there are many spheroidal graphite cast irons. If the weather and temperature are considered in the north, the ...

In order to reduce the operating torque of the ball valve and increase the reliability of the seal, oil seal ball valves have appeared in recent years, and the special lubricating oil is injected between the sealing faces to form an oil film, which e...

Safekeeping ◆The purpose of storage and maintenance is to prevent damage to the valve during storage, or reduce quality. In fact, improper storage is one of the important reasons for valve damage. ◆Valves should be kept in an orderly manner. Small v...

Ball valves have been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rocket and other departments, as well as people's daily lives. The ball valve can be divided according to the structure: First, the floating b...