Pneumatic pilot valve

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 11/048 (2006.01) F16K 11/16 (2006.01)

Patent

CA 2609292

A pneumatic pilot valve comprises a valve body (20) having an inlet (22) , an outlet (24) , a flow passage (32) , and first (28) and second (30) valves arranged to control flow through the valve. The second valve includes a tapered valve seat (46) opening into a cylindrical bore (50) , and a thrust pin (52) includes a tapered second part (60) and an annular recess having a seal. The thrust pin is movable between a first position, a second position, and an intermediate position. The tapered second part of the thrust pin is arranged to engage the tapered valve seat to close the second valve when the thrust pin moves to the second position, and the resilient seal is sized to engage the cylindrical bore when the thrust pin is in the intermediate position.

L'invention concerne une soupape pneumatique pilote comprenant un corps de soupape (20) équipé d'une entrée (22), d'une sortie (24), d'un passage d'écoulement (32), et de première (28) et seconde (30) soupapes disposées de manière à commander l'écoulement à travers la soupape. La seconde soupape comprend un siège de soupape tronconique (46) ouvrant sur un alésage cylindrique (50), et une tige poussoir (52) comprenant une seconde partie tronconique (60) et un retrait annulaire équipé d'un joint. La tige poussoir est mobile entre une première position, une deuxième position, et une position intermédiaire. La seconde partie tronconique de la tige poussoir est placée de manière à se coupler avec le siège de soupape tronconique afin de fermer la seconde soupape lorsque la tige poussoir se déplace dans la deuxième position, et le joint élastique est dimensionné de manière à ce couplé à l'alésage cylindrique lorsque la tige poussoir se trouve en position intermédiaire.

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