Emergency pressure relief valve with enhanced reset

Details Emergency pressure relief valve with enhanced reset Emergency pressure relief valve with enhanced reset

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 17/02 (2006.01) F16K 31/122 (2006.01)

Patent

CA 2485817

A pressure relief valve has a housing fluidly connected to a pressurized system line carrying a system fluid. The housing carries a moveable piston and a valve member that both move between closed and open positions. The piston defines an upper chamber and a lower chamber within the housing. A pressurized fluid is supplied to the upper chamber to bias the piston toward the closed position. After the relief valve opens from excessive system pressure, the pressurized fluid is injected into the lower chamber to delay the return of the piston to the closed position. Initially, the fluid in the lower chamber flows through a check valve while the piston returns to the closed position. Then the fluid went in the lower chamber vents from the lower chamber as the piston and valve member approach the closed position.

Une soupape de surpression est dotée d'un corps relié par un liquide à une conduite sous pression d'un circuit qui transporte un liquide. Le corps comprend un piston mobile et un clapet qui s'ouvrent et se ferment. Le piston établit les limites d'une chambre supérieure et d'une chambre inférieure dans le corps. Un liquide sous pression est acheminé à la chambre supérieure pour pousser le piston à la position fermée. Une fois la soupape de surpression ouverte à cause d'une pression circuit excessive, le liquide sous pression est injecté dans la chambre inférieure afin de ralentir le retour du piston à la position fermée. Au départ, le liquide qui se trouve dans la chambre inférieure s'écoule par un clapet antiretour pendant que le piston retourne à la position fermée. Puis, le liquide s'écoule de la chambre inférieure par les évents de la chambre inférieure pendant que le piston et le clapet s'approchent de la position fermée.

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