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A dispensing valve apparatus and method for rapidly dispensing fluid from a fluid reservoir of a pressure vessel include a piston translatable within a cavity that closes a discharge passage opening the cavity when positioned in a first position and opens the discharge passage to fluid flow from the

A dispensing valve apparatus and method for rapidly dispensing fluid from a fluid reservoir of a pressure vessel include a piston translatable within a cavity that closes a discharge passage opening the cavity when positioned in a first position and opens the discharge passage to fluid flow from the fluid reservoir when positioned in a second position. The piston may be rapidly repositioned from its position to its second position by venting a cavity disposed between the piston and an actuator cap by selectively opening a check valve to vent the pressure within the cavity to the discharge passage.

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1. A dispensing valve apparatus for dispensing a fire suppressant fluid from a pressure vessel having a fluid reservoir containing the fire suppressant fluid under pressure, said dispensing valve apparatus comprising: a valve body having a forward end adapted to mount to the pressure vessel, said va

1. A dispensing valve apparatus for dispensing a fire suppressant fluid from a pressure vessel having a fluid reservoir containing the fire suppressant fluid under pressure, said dispensing valve apparatus comprising: a valve body having a forward end adapted to mount to the pressure vessel, said valve body having a bore extending axially therethrough, said bore defining an axially extending central cavity having a forward cavity for receiving fluid from the fluid reservoir of the pressure vessel and a rearward cavity, said valve body having a generally radially extending discharge passage opening to the forward cavity;a piston disposed within said cavity, said piston being axially translatable within the forward cavity and the rearward cavity from a first position wherein said discharge passage is closed to fluid flow and a second position wherein said discharge passage is open to fluid flow;an actuator cap secured to said valve body at a rearward end of the rearward cavity, said actuator cap having a central bore establishing a fluid flow passage in fluid flow communication with the rearward cavity and extending through said actuator cap;a check valve disposed within said central bore through said actuator cap, said check valve positionable between a first position wherein said central bore through said actuator cap is closed to fluid flow and a second position wherein said central bore through said actuator cap is open to fluid flow; andsaid valve body having a vent passage extending through said valve body, said vent passage being in fluid flow communication with said discharge passage, said vent passage being in fluid flow communication with said rearward cavity when said check valve is positioned in its second position, said vent passage fluidly connecting said rearward cavity and said discharge passage internally of said valve body. 2. A dispensing valve apparatus for dispensing a fire suppressant fluid from a pressure vessel having a fluid reservoir containing the fire suppressant fluid under pressure, said dispensing valve apparatus comprising: a valve body having a forward end adapted to mount to the pressure vessel, said valve body having a bore extending axially therethrough, said bore defining an axially extending central cavity having a forward cavity for receiving fluid from the fluid reservoir of the pressure vessel and a rearward cavity, said valve body having a generally radially extending discharge passage opening to the forward cavity;a piston disposed within said cavity, said piston being axially translatable within the forward cavity and the rearward cavity from a first position wherein said discharge passage is closed to fluid flow and a second position wherein said discharge passage is open to fluid flow;an actuator cap secured to said valve body at a rearward end of the rearward cavity, said actuator cap having a central bore establishing a fluid flow passage in fluid flow communication with the rearward cavity and extending through said actuator cap;a check valve disposed within said central bore through said actuator cap, said check valve positionable between a first position wherein said central bore through said actuator cap is closed to fluid flow and a second position wherein said central bore through said actuator cap is open to fluid flow;said valve body having a vent passage extending through said valve body, said vent passage being in fluid flow communication with said discharge passage, said vent passage being in fluid flow communication with said rearward cavity when said check valve is positioned in its second position;a valve cap secured to a rearward end of said valve body, said valve cap defining a valve cap cavity; andan actuator disposed within the valve cap cavity, said actuator being selectively axially translatable toward said actuator cap for repositioning said actuator cap check valve from its first position to its second position. 3. A dispensing valve apparatus as recited in claim 2 wherein said vent passage is in fluid flow communication with the valve cap cavity. 4. A dispensing valve apparatus as recited in claim 1, wherein a section of the rearward cavity disposed between said piston in its first position and said actuator cap comprises a balance pressure chamber. 5. A dispensing valve apparatus as recited in claim 4, wherein said piston is held in its first position when a fluid pressure in the balance pressure chamber is equal to a fluid pressure within said forward cavity.