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lower control chamber, causing the main valve to powerfully open. in cases where pipeline water is contaminated (corrosive, debris laden) or where vacuum conditions exist, external control fluid is often used. normally closed, normally open and last position models are available. for " and larger valves...
filling, opening at pre-set reservoir low level and shutting off at pre-set high level. during filling, it sustains minimum upstream pressure regardless of fluctuating flow or reservoir level. n reservoir level control n prioritizing consumers over reservoir filling n backup for reservoir supply valves...
line with lower elevation consumers. each model -u protects the lower elevation consumers. it reduces their supply pressure and, in case of burst, "closes & locks," preventing flooding. the model -m, installed at the reservoir outlet, also protects against reservoir emptying. model -u quick pressure relief...
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are normally closed with a straight flow poppet design, allowing free flow in one direction, while preventing flow in the opposite direction. the internal spring enhances the sealing and the immediate closing properties of the check valve. being spring loaded these check valves are suitable for installation...
, aisi or aisi - working temperatures and seal materials: nbr ...+ oc fpm ...+ oc ptfe ...+ oc (silicon ring with teflon-fep) - threaded ends: uni iso female - opening pressure: min. bar; max. bar - nominal working pressure: bar dimensions size dn a b c weight in gr. / " " " / " / " " / " " check valves...
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are opened in proper sequence, and the system is evacuated to an ultimate vacuum in the - torr range. the vac aero design uses a holding pump to maintain a low pressure on the diffusion pump foreline at all times. this feature, combined with properly timed sequencing of vacuum valves, eliminates backstreaming...