Piston Valve
Reducing Valve's Features, Applicable Occasions and Selective Principles
Features
The reducing valve is a kind of valve which mainly operated by regulating, cutting the inlet pressure to be matched with the outlet, also depending on the medium energy and then making the outlet pressure remain stable automatically.
From the point of fluid mechanics, the reducing valve is a throttling component that can change partial resistance just as that the throttling area. In this way, it would make the kinetic energy of velocity and fluid change and the pressure reduce eventually. Next relying on the control and adjustment of the system, it balances the outlet pressure oscillation and spring force and keeps the outlet pressure constant within some error range.
Applicable Occasions
Reducing valve is also named automatic valve, a kind of regulator valve. It works under the throttle of disc, the cut of the inlet pressure to a needed outlet. When the inlet pressure and flow rate change, the valve could also make good use of the medium energy to make the outlet pressure unchanged basically.
According to the action principle, the reducing valve is divided into directly reducing valve and pilot reducing valve. The direct reducing valve uses the change of outlet pressure to affect the disc movement. Bellow direct reducing valve apply to low pressure and medium, small diameter steam. Diaphragm direct reducing valve apply to low pressure and medium, small diameter air and water. Pilot reducing valve is composed of pilot valve and main valve, the change of outlet pressure is made by enlarging pilot valve to control main valve¡¯s disc movement. Pilot piston reducing valve apply to all kinds of pressure, dimension and temperature steam, air and water. If the valve is made of stainless acid resistant steel, it could apply to various kinds of corrosive media. Pilot bellow reducing valve apply to low pressure and medium, small diameter steam, air and water, etc. Pilot diaphragm reducing valve apply to medium and low pressure, medium and small diameter steam or water, etc.
Selective Principles
1,The reducing valve's inlet pressure fluctuation should be controlled within its fixed value, 80%¡«105%. If surpassing that range, the performance of the reducing valve will be affected. Usually the pc should be less than p1, Pc<0.5P1.
2,Each gear of reducing valve is applicable within pc range. Once surpassing, please replace the spring.
3,At relatively high temperature place, choosing pilot piston reducing valve or pilot bellow reducing valve.
4,In air or water, choosing direct diaphragm reducing valve or pilot bellow reducing valve.
5,In steam, choosing pilot piston reducing valve or pilot bellow reducing valve.
6,For the convenience of operation, adjusting and maintaining, the reducing valve should be fixed on the level pipeline.
All rights reserved by FBIC Inc., do remember to show the source of the news when copying.
About the Author
FBIC Inc., a member of Siduona group in flow-control business, has over 15 year experience in manufacturing ball valve, gate valve, globe valve, check check valve, plug valve and butterfly valve in carbon steel, stainless steel Valve.
Barrel Sealing Piston Valve (Part 1)
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