SINGLE CHECK VALVE
| A Single Check valve is designed for use in “low hazard” condition in services to prevent backflow caused by back-siphonage or back pressure. It is intended for use under continuous pressure conditions. The check is designed to maintain a minimum of 1psi across the check valve during normal operation.
SD-SCDA have a check module as SD-SCV and add a DN20 bypass line with a water meter to allow monitoring of small draw-offs of water. |
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DOUBLE CHECK VALVE
DOUBLE CHECK DETECTOR ASSEMBLY (SD-DCDA)SD-DCDA have two check module as SD-DCV and add a DN20 bypass line with a water meter to allow monitoring of small draw-offs of water. |
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REDUCED PRESSURE DETECTOR ASSEMBLY (SD-RPDA)SD-RPDA have two check module as SD-RPZD and add a DN20 bypass line with a water meter to allow monitoring of small draw-offs of water. |
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REDUCED PRESSURE ZONE ASSEMBLY (SD-RPZD)A Reduced pressure zone devices is a testable device designed for use in high hazard conditions to prevent backflow caused by back-siphonage or back pressure. It is intended for use under continuous pressure conditions. The first check is designed to maintain 40Kpa across the check valve. The second check is designed to maintain 10Kpa across the check valve during normal operation. Supply pressure on the upstream side of the first check valve acts against the diaphragm to close the relief valve during normal operation. The release valve will open to maintain the pressure in the zone at least 14Kpa less than the upstream pressure. |
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