How to install valves properly?
Valves are used in a wide range of applications, from the simplest shut-off valves to various valves used in extremely complex automatic control systems. Valves are closely related to people's daily life, such as the tap for water pipes, the pressure reducing valve for LPG stoves are valves. Valve is also a variety of mechanical equipment such as internal combustion engines, steam engines, compressors, pumps, pneumatic transmission devices, hydraulic transmission devices vehicles, ships, and aircraft in indispensable components.
Valve is the most common equipment in chemical enterprises, the installation of valves, is seemingly easy, but if not in accordance with the relevant technical implementation, will cause safety accidents.
Valve installation before the check
Pressure test of the valve
Low-pressure, medium-pressure and high-pressure valves to strength test and tightness test, alloy steel valves should also be carried out on a case-by-case spectral analysis, review of the material.
The strength test of the valve is tested in the valve open state, checking the leakage of the external surface of the valve. pn ≤ 32MPa valve, the test pressure of 1.5 times the nominal pressure, the test time of not less than 5min, the shell, packing gland at no leakage for qualified.
In the valve completely closed test, check whether the valve sealing surface leakage, the test pressure, in addition to butterfly valves, check valves, bottom valves, throttle valves outside the valve, generally should be nominal pressure, in the ability to determine the working pressure, also available 1.25 times the working pressure for testing, to the valve sealing surface does not leak as qualified.
General provisions of valve installation
Valve installation precautions
Installation of pressure relief valves
The role of valve installation seat valve
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