The selection criteria of the check valve are as follows 1. In order to prevent the medium from flowing back, check valves should be installed on the equipment, devices and pipelines; 2. Check valves are generally suitable for clean media, not for me...

1. The structure length is short, and its structure length is only 1/4~1/8 of the traditional flange check valve 2. Small size and light weight, its weight is only 1/4~1/20 of the traditional flange check valve 3. The valve flap closes quickly and th...

    ASME B16.5 has clear regulations on the number of bolt holes and the diameter of bolt holes in flanges. The number and diameter of flange bolt holes are different due to different flange pressure levels, but all types of flanges of the same press...

Check valve refers to the valve that automatically opens and closes the disc depending on the flow of the medium itself to prevent the medium from flowing back. It is also called check valve, one-way valve, reverse flow valve and back pressure valve....

With the advancement of skills, high-parameter and messy working conditions such as high temperature, high pressure, deep cold, high vacuum, strong corrosion, radioactivity, highly toxic, flammable and explosive, etc. in industrial production are inc...

The disadvantage of the rubber-sealed butterfly valve is that when it is used for throttling, it will cause cavitation due to improper use, causing the rubber seat to peel off and damage. For this reason, metal sealing butterfly valves are now being ...

To maintain air tightness, the valve 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, prevent...

After the valve is used for a long time, the sealing surface of the valve disc and the valve seat will be worn and the tightness will be reduced. Repairing the sealing surface is a large and very important task. The main method of repair is grinding....

At first glance, there are not many valve parts, simple structure, and average precision. They are simple parts in the machinery industry, but the core sealing parts of the valve are particularly demanding. The valve manufacturing process is complex ...

1. Leakage at the packing of soft seal gate valve (1) The packing gland is too loose, and the nuts used to compress the packing gland can be tightened evenly. (2) The number of packing circles is not enough, so packing should be added. (3) The packin...

   When it comes to flanges, many people may not have a special understanding, and they may not be particularly familiar in our daily lives. However, it is very common in some pipeline projects. There are holes in the flanges and bolts make the flang...

Cleaning method Welding slag, rust, slag, etc. in the pipeline cause blockage or jam in the throttle, guide part, and balance hole of the lower bonnet, causing strain and scratches on the valve core surface and guide surface, and indentation on the s...