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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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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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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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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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1. What is the difference between Cast iron and Cast steel? The difference between Cast iron and Cast steel is their carbon content. Cast Iron with carbon content greater than 2.06% is iron; steel with carbon content between 0.02% and 2.06% is steel. 2. What is carbon steel? How many categories does it fall into? An alloy of carbon and iron (when the carbon content is between 0.02% and 2.06%) is c...
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1. What is the value of flow coefficient Kv? What is the flow coefficient Cv? Volumetric flow of water flowing between 5 ° C (40 ° F) and 40 ° C (104 ° F) through the valve to produce a pressure loss of 1 bar (14.7 psi), expressed in cubic meters per hour. Kv = Cv / 1.156 Flow coefficient Cv: It is the mass flow rate when water flows through the valve at 15.6 ° C (60 ° F) to produce 1psi, expresse...
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1. How do the pressures of ultra high pressure valves, high pressure valves, medium pressure valves, and low pressure valves differ? Ultra high pressure valve, nominal pressure PN≥100MPa; high pressure valve, nominal pressure PN10.0MPa-80.0MPa; medium pressure valve, nominal pressure PN2.5MPa-PN6.4MPa; low pressure valve PN≤1.6MPa. 2. How to distinguish the calibers of extra large caliber valves, ...
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Compared with other mechanical manufacturing processes, the valve manufacturing process has the following characteristics: A. The manufacture and inspection technology of valve rough is very complicated. The valve's casting blank is a thin-walled shell with complicated structure. Casting requires a smooth surface, casting characters clear, especially to have a dense structure, and do not allow the...
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To understand the difference between globe valve and stop check valve, we should first figure out what is a stop check valve. Stop check valve combines the functions of a general globe valve and check valve, which means besides isolating and regulating the flow rate, it can also prevent reverse flow. From the appearance, globe valve and stop check valve almost look the same. The main difference li...
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Valve actuator is a device for operating and connecting valve. The device can be driven by power source of electric power, air pressure, hydraulic pressure or other combination, and its motion process can be controlled by the stroke, torque or axial thrust. Because the actuator working characteristics and utilization rate depend on the valve type, the working specifications, and the position of th...
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