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A Introduction to Control Valves
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  • A Introduction to Control Valves

  • The working of ball valve
    Ball valves are usually found in controlling the flow of high-weight fluids and gas lines. This is because that these valves don’t reduce the flow weight and limit liquid flow. Ball valves are dominantly put in where the supply pipe’s internal breadth is 6 inches or less.   A ball valve is a valve used to divert the flow. When open, it gives access to the medium and when closed, it cuts off t...
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  • Chose between bronze and brass valves
    Bronze and brass are two of the most common materials used to produce valves. This preference comes because both metals are quite malleable. They both are artificially made from natural metallurgical elements: brass is made from copper and zinc, while another is made primarily from copper and tin. Each metal offers valves numerous and various advantages...
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  • Knife Gate Valve vs. Gate Valve
    The biggest difference between a knife gate valve and a gate valve is that gate valve is manufactured according to ANSI , while knife gate valve meets TAPPI Standards. Gate valves are also flanged, wider in size, ANSI pressure rated, and their API leak tightness standards need to be met as well. Gate valves are bi-directional, widely used in fluid applications, and they only come with metal seats....
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  • Physical Reason Why Check Valve Born
    For high-pressure piping systems where multiple pumps are used together, the problem of water hammer in the piping system is even more acute. Water hammer is a pressure wave of the ever-changing flow in a pressure pipe, which is a hydraulic shock caused by a pressure rise or fall due to the change in the fluid flow rate in the pressure pipe. Water hammer is the combined result of the inc...
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  • Structural Features of Floating Ball Valve
    The ball of the floating ball valve is suspended. Under the pressure of the medium, the ball will move and press against the outlet side of the seal. The floating ball valve is only widely used for medium and low-pressure conditions because the pressure of the medium completely transfers the ball weight to the seal at the outlet. For the same reason, the design of the floating ball valve should fo...
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  • Measures To Prevent Abnormal Boost of Cryogenic Valves
    If the medium remained in the cavity after the cryogenic gate valve is closed, the residue will gradually absorb the heat in the air and re-gasify. After the gasification, it will expand violently up to 600 times and generate extremely high pressure on the valve, which is called 'abnormal boost'. When the unusual occurrence happens, the wedge will be pressed firmly onto the seat and can’t be opene...
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  • Testing methods of various valves Ⅲ
    6.For globe valve and choke valve When it comes to the strength test of the globe valve and the choke valve, the assembled valve is usually placed in the pressure test frame. Then, open the wedge, inject the medium to the specified value, finally check if the body and the bonnet of the valve‘sweat’or leak. Only the globe valve can be put in the sealing performance test. During the test, keep the s...
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  • Testing methods of various valves Ⅱ
    3, For Butterfly Valve The pneumatic test of the butterfly valve is the same as the test of the globe valve. The test medium should flow into the valve from the inputting end when the test begins. Open the disc and close another end. Check the packing and other sealing parts weather it leaks after the pressure has been pumped up to the set value. Then close the disc, open the other end, check the ...
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  • Testing methods of various valves Ⅰ
    In general, industrial valves don’t have to do a strength test in use. But repaired or corroded body and bonnet should do that. Common media used in valve pressure testing are water, oil, air, steam, nitrogen and so on. And valve pressure test methods of all kinds of industrial valves, including pneumatic, are as follows: 1.For ball valve The pneumatic test of the ball valve should be carried out ...
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