Abstract: A pilot valve assembly for use with a main valve apparatus coupled to a water pipe, includes a differential pilot valve, and first and second pilot valves. An inlet of the differential pilot valve is coupled to a junction and an outlet is coupled to the first pilot valve. The differential pilot valve is responsive to a pressure differential to open and close the differential pilot valve to control water flow therethrough to the first pilot. The first pilot valve is responsive to a first pressure to close the first pilot valve to reduce water flow therethrough. The second pilot valve is coupled to the junction to facilitate water flow through the second pilot valve when the differential valve member is open. The second pilot valve is responsive to a second pressure to close the second pilot valve to reduce water flow therethrough.

Abstract: A pilot valve assembly for use with a main valve apparatus coupled to a water pipe, includes a differential pilot valve apparatus, and first and second pilot valve apparatuses. An inlet of the differential pilot valve is coupled to a junction and an outlet is coupled to the first pilot valve apparatus. The differential pilot valve is responsive to a pressure differential to open the differential pilot valve apparatus for water to flow to the first pilot valve apparatus and to close the differential pilot valve apparatus to inhibit water flow to the first pilot valve apparatus. The second pilot valve apparatus is coupled to the junction to facilitate water flow through the second pilot valve apparatus when the second differential valve member is open. Adjustment mechanisms facilitate adjustment of the pressures responsive to which the first pilot valve member and the second pilot valve member close.

Abstract: A pilot valve assembly for use with a main valve apparatus coupled to a water pipe, includes a differential pilot valve apparatus, and first and second pilot valve apparatuses. An inlet of the differential pilot valve is coupled to a junction and an outlet is coupled to the first pilot valve apparatus. The differential pilot valve is responsive to a pressure differential to open the differential pilot valve apparatus for water to flow to the first pilot valve apparatus and to close the differential pilot valve apparatus to inhibit water flow to the first pilot valve apparatus. The second pilot valve apparatus is coupled to the junction to facilitate flow of water through the second pilot valve apparatus when the second differential valve member is in an open position. Adjustment mechanisms facilitate adjustment of the pressures responsive to which the first pilot valve member and the second pilot valve member close.

Abstract: A pilot valve assembly for use with a main valve apparatus coupled to a water pipe, includes a differential pilot valve apparatus, and first and second pilot valve apparatuses. An inlet of the differential pilot valve is coupled to a junction and an outlet is coupled to the first pilot valve apparatus. The differential pilot valve is responsive to a pressure differential to open the differential pilot valve apparatus for water to flow to the first pilot valve apparatus and to close the differential pilot valve apparatus to inhibit water flow to the first pilot valve apparatus. The first pilot valve apparatus is responsive to a first pressure to close the first pilot valve to reduce flow of water therethrough. The second pilot valve apparatus is coupled to the junction to facilitate flow of water through the second pilot valve apparatus when the second differential valve member is in an open position.

Abstract: A pressure relief valve for relieving excess pressure in a fluid distribution system comprising a valve body having an inlet port and an outlet port in communication with an interior of the valve body. The inlet port is connectable to the fluid distribution system. A valve member within the interior of the valve body is movable between a closed position to prevent fluid flow through the body and an open position to permit fluid flow. The valve member is exposed to a first opening force exerted directly by the pressure in the fluid distribution system. There is a movable piston/diaphragm member co-operating with the valve member such that the piston/diaphragm is exposed to the pressure in the fluid distribution system to provide a second opening force for the valve member. A biasing system exerts a default closing force to move the valve member to the closed position. The closing force is set to be equivalent to a pre-selected pressure in the fluid distribution system.

Abstract: The invention provides a pilot valve apparatus for use in an automatic fluid control system for maintaining pressure downstream from a main control valve between two setpoints irrespective of flow changes through the main control valve. The pilot valve has a flexible pilot diaphragm which moves with a moveable pilot valve member to cooperate with a fixed pilot valve member to control fluid flow through the pilot valve apparatus. The pilot valve controls control pressure acting on the main control valve. An actuator apparatus connected to a body of the pilot valve apparatus has a moveable actuator partition which is exposed to a pressure differential signal reflecting flow through the main control valve. A resilient connector cooperates with the actuator partition and the pilot diaphragm to permit limited relative movement therebetween, and to transfer resilient force to the pilot diaphragm resulting from movement of the actuator partition.