Valve Opened Flowing Under Pressure (Diagram 1.)
With flow through valve, primary disc (1) opens away from diaphragm seal (2). Atmospheric port (3) remains closed by deflection of diaphragm seal. Secondary disc (4) opens away from downstream seat (5). Ball check (6) opens away from ball check seat permitting flow of water through valve.
Features
Incorporates an additional ball type check valve to protect against strong water hammer created by fast acting drink dispenser taps
CAPACITY
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| Specific Installantion Requirements |
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Not to be located in a corrosive or polluted environment |
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Insulation or other protection not to interfere with its operation or maintenance |
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Not to be located in a pit, or buried in the ground |
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No heat to be applied during installation |
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Not to be subject to freezing temperatures |
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Suitable for horizontal or vertical installation |
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Have minimum air gap below vent of 40mm |
 Valve
Closed b Backpressure in System (Diagram 2.)
With a backpressure condition, ball check seats against ball check seat. Secondary disc seals against downstream seat. Primary disc seals against diaphragm. Atmospheric port is now open permitting air to enter air break chamber. In the event of fouling of downstream check valve, leakage of CO2 gas would be vented to atmosphere through the vent port safeguarding the potable water system from CO2 gas contamination.
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