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 Khách trực tuyến: 58 |
 Lượt truy cập: 50117 |
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Surge Anticipating valve, Pressure Relief Valve,
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Surge Anticipating valve, Pressure Relief Valve, |
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The surge anticipating valve is adjusted to eliminate hazardous pressure surges typical of water hammer conditions. A water hammer is caused by an abrupt shutoff of a pump or rapid closure of a main valve, causing a fast propagation of low pressure front, followed by an extremely high pressure back-wave. A series of pressure waves, each one composed of alternating low & high pressure, is created within a few minutes.
Application of surge anticipating valve:
Use a surge anticipating valve to protect water lines against water hammer damages. Uphill supply lines of considerable length & large diameter pipes are more susceptible to water hammer damages.
For more info or hazard analysis of particular network consult Iva Vietnam Engineers.
Installation
The Surge Anticipating hydraulic Valve is activated by line pressure & controlled by two pilot valves. Both pilots include spring-loaded membranes. The low pressure pilot (the left one in the drawings) is preset to open the surge anticipating valve gradually when the line pressure drops about 10m below normal. The high pressure pilot (on the right) is preset to open the surge valve when the line pressure rises about 10m above normal. The surge valve is normally closed. Only when the line pressure is drops below or rises above the preset limits, the surge valve is piloted to open. A water hammer event starts with a considerable pressure drop, which cause the surge valve to open. Then, as the water wave rolling backward, the valve remains open & let the pressure out to diminish its impact.
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