Patent ID: 8727029

Claim:
A fire protection system comprising: a fire suppressant fluid supply; sprinkler system piping; a fire protection system control valve having an inlet in communication with said fire suppressant fluid supply line and an outlet in communication with said sprinkler system piping, said fire protection system control valve including a priming chamber and an intermediate chamber; and a trim manifold assembly comprising: a manifold block; a prime line input passage in said manifold block connected to and receiving fire suppressant fluid from the fire suppressant fluid supply upstream of the fire protection system control valve; a path line output passage in said manifold block and in communication with the prime line input passage, said prime line output passage being connected to said priming chamber of said fire protection system control valve; a prime line shut-off valve disposed in said manifold block and in communication with said prime line input passage; a pressure operating relief valve passage in said manifold block and communicating with said intermediate chamber of said fire protection system control valve; and a pressure operating relief valve in said pressure operating relief valve passage and responsive to the presence of fire suppressant fluid in said intermediate chamber of said fire protection system control valve, said pressure operating relief valve including a valve portion which closes a passage between said prime line output passage and a drain passage within said manifold block when no fire suppressant fluid is in said intermediate chamber of said fire protection system control valve and opens communication between said prime line output passage and said drain passage when fire suppressant fluid is in said intermediate chamber of said fire protection system control valve, wherein the fire protection system control valve is responsive to a change in fluid pressure in said prime line output passage to control the flow of fire suppressant fluid from the fire suppressant fluid supply line to the sprinkler system piping.