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1. (WO2017178794) PROTECTION VALVE

Pub. No.:    WO/2017/178794    International Application No.:    PCT/GB2017/050948
Publication Date: Fri Oct 20 01:59:59 CEST 2017 International Filing Date: Thu Apr 06 01:59:59 CEST 2017
IPC: F16K 15/18
F16K 51/02
Inventors: LEECH, Ralph
A protection valve (20) isolates gas flow between an upstream vacuum chamber (14) and a downstream vacuum pump (16). The protection valve comprises a valve seat (24); a valve member (22) which in a first valve condition seals against the valve seat to prevent gas flow and in a second valve condition is spaced from the seat to allow gas flow; an actuator (36) comprising an actuator member (34) co-operable with the valve member and having a first actuator position which causes the valve member to seal against the valve seat in the first valve condition, the actuator member having a second actuator position in which the actuator member allows the valve member to move between first and second valve conditions responsive to a pressure difference between the upstream vacuum chamber and downstream vacuum pump.