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System and method for controlling a hazardous fluid distribution facility wherein a control arrangement is provided at the facility having a power on switch providing for its general energization and de-energization along with a start switch which is actuated by an operator for an interval of time s

System and method for controlling a hazardous fluid distribution facility wherein a control arrangement is provided at the facility having a power on switch providing for its general energization and de-energization along with a start switch which is actuated by an operator for an interval of time sufficient for a gas pressure control monitor to assume an enable condition causing the actuation of tank valves and the enablement of emergency shut-off valves. A receiver is incorporated with the housing which performs in conjunction with strategically positioned emergency transmitters which are actuated by personnel in the event of a perceived emergency condition. The transmitters transmit an off-state signal which is responded to by the receiver circuit to vent the pneumatic actuation and enablement system as well as to disenable electrical input to pump motors. The transmitters are polled periodically by the receiver circuit to determine their operational status.

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System and method for controlling a hazardous fluid distribution facility wherein a control arrangement is provided at the facility having a power on switch providing for its general energization and de-energization along with a start switch which is actuated by an operator for an interval of time s

System and method for controlling a hazardous fluid distribution facility wherein a control arrangement is provided at the facility having a power on switch providing for its general energization and de-energization along with a start switch which is actuated by an operator for an interval of time sufficient for a gas pressure control monitor to assume an enable condition causing the actuation of tank valves and the enablement of emergency shut-off valves. A receiver is incorporated with the housing which performs in conjunction with strategically positioned emergency transmitters which are actuated by personnel in the event of a perceived emergency condition. The transmitters transmit an off-state signal which is responded to by the receiver circuit to vent the pneumatic actuation and enablement system as well as to disenable electrical input to pump motors. The transmitters are polled periodically by the receiver circuit to determine their operational status. and an on/off valve (40). piston location; a unidirectional seal positioned to allow air to flow between said inside diameter of said dampener cylinder and said piston assembly when said piston moves toward said outlet end of said valve body; said unidirectional seal also being positioned to prevent air from flowing between said inside diameter of said dampener cylinder and said piston assembly when said piston moves away from said outlet end of said valve body. 4. The unloader check valve of claim 1 in which said dampener further comprises: a dampener cylinder having a first end, a second end, and an inside diameter, said first end of said dampener cylinder being positioned at the outlet end of said valve body, said second end of said dampener cylinder having a dampener orifice therethrough; said piston assembly extending into said dampener cylinder when said piston is at the first piston location; an o-ring seal positioned to prevent air from flowing between said inside diameter of said dampener cylinder and said piston assembly when said piston moves toward said outlet end of said valve body; said o-ring seal also being positioned to prevent air from flowing between said inside diameter of said dampener cylinder and said piston assembly when said piston moves away from said outlet end of said valve body. 5. The unloader check valve of claim 1, said check valve seal comprising an o-ring mounted on said piston. 6. The unloader check valve of claim 1, said piston assembly including a ball positioned to reciprocate with said piston and to comprise said check valve seal, said ball contacting said check valve seat when said piston is in the first piston location. 7. The unloader check valve of claim 1, said piston assembly including a bumper mounted on said piston between said valve seat assembly and said output end of said valve body, said bumper having a size which allows a sufficient amount of clearance with said valve body to allow air pressure to flow from said check valve seal to said outlet end of said valve body when said piston is at a location that is downstream of the first piston location. 8. The unloader check valve of claim 1, said piston assembly including a first bumper comprising an o-ring mounted on said piston between said valve seat assembly and said output end of said valve body, said bumper having a size which allows a sufficient amount of clearance with said valve body to allow air pressure to flow from said check valve seal to said outlet end of said valve body. 9. The unloader check valve of claim 1, said piston assembly including a first bumper comprising a ball positioned to reciprocate with said piston, said bumper having a size which allows a sufficient amount of clearance with said valve body to allow air pressure to flow from said check valve seal to said outlet end of said valve body. 10. The unloader check valve of claim 1, said piston assembly including a ball positioned to reciprocate with said piston, said ball comprising said check valve seal and contacting said check valve seat when said piston is in the first piston location, said ball further comprising a first bumper having a size which allows a sufficient amount of clearance with said valve body to allow air pressure to flow from said check valve seal to said outlet end of said valve body. 11. The unloader check valve of claim 1, said plurality of raised unloader seating elements comprising three approximately equidistantly spaced seating elements. 12. The unloader check valve of claim 1, said plurality of raised unloader seating elements comprising three approximately equidistantly spaced seating elements, each said unloader seating element having one said passage leading from said groove toward said inlet end of said valve body. 13. The unloader check valve of claim 1, said unloader valve seal comprising a material that is sufficiently resilient to allow said unloader seating elements to impress and seal against said unloader valve seal when said unloa