Abstract: An improved trap primer valve may include a valve body having a central tube having a proximal end coupled to an outlet orifice and an open distal end extending into a longitudinal bore of the valve, such that fluid exiting the outlet orifice passes through the central tube. A plug, including a head portion and a rod extending from the head portion into the central tube, may be configured to selectively seat against the distal end of the central tube. An annular cartridge surrounding the central tube may have one or more apertures leading to a partially water-filled inner chamber, and may be configured to unseat the plug in automatic response to a fluctuation in system water pressure, thereby opening the valve and charging a downstream trap.

Abstract: A flow meter trap primer valve assembly for regulating flow includes an inlet for receiving water from a supply, a check valve mounted within an adaptor having an elongate bore forming a jet, and the check valve includes a piston mounted within a cartridge. A biasing element normally urges the piston against a trap seat.

Abstract: A flow meter trap primer valve assembly for regulating flow includes an inlet for receiving water from a supply, a check valve mounted within an adaptor having an elongate bore forming a jet, and the check valve includes a piston mounted within a cartridge. A biasing element normally urges the piston against a trap seat.

Abstract: A self-contained trap primer valve assembly is housed in a cabinet and includes a conduit for connection to a building's water main to carry water under pressure, a valve is operatively mounted in the conduit and a solenoid is operable for selectively opening and closing the valve, wherein a low voltage battery and a timer mechanism connected to the battery and preset for selectively actuating the solenoid, opens and closes the valve for preselected durations.

Abstract: A flow meter trap primer valve assembly for regulating flow includes an inlet for receiving water from a supply, a check valve mounted within an adaptor having an elongate bore forming a jet, and the check valve includes a piston mounted within a cartridge. A biasing element normally urges the piston against a trap seat.

Abstract: A self-contained trap primer valve assembly is housed in a cabinet and includes a conduit for connection to a building's water main to carry water under pressure, a valve is operatively mounted in the conduit and a solenoid is operable for selectively opening and closing the valve, wherein a low voltage battery and a timer mechanism connected to the battery and preset for selectively actuating the solenoid, opens and closes the valve for preselected durations.

Abstract: A self-contained trap primer valve assembly is housed in a cabinet and includes a conduit for connection to a building's water main to carry water under pressure, a valve is operatively mounted in the conduit and a solenoid is operable for selectively opening and closing the valve, wherein a low voltage battery and a timer mechanism connected to the battery and preset for selectively actuating the solenoid, opens and closes the valve for preselected durations.

Abstract: A self-contained trap primer valve assembly is housed in a cabinet and includes a conduit for connection to a building's water main to carry water under pressure, a valve is operatively mounted in the conduit and a solenoid is operable for selectively opening and closing the valve, wherein a low voltage battery and a timer mechanism connected to the battery and preset for selectively actuating the solenoid, opens and closes the valve for preselected durations.

Abstract: A pressure activated trap primer valve for drain traps includes an expansion chamber with a piston between the compressible air and water. The piston prevents waterlogging of the expansion chamber to reduce maintenance of the trap primer valve. The trap primer valve also includes an inlet pipe coaxially configured in the expansion chamber. The inlet pipe is operably connected to a chamber below the expansion chamber which is closed at the bottom by a diaphragm. The diaphragm in a relaxed, undeflected position closes an outlet that drains to the trap. A chamber below the diaphragm is replenished by the expansion chamber. When pressure in the supply pipe and inlet pipe decreases, such as when a faucet is opened, the diaphragm deflects. Deflecting the diaphragm opens the outlet, allowing a limited amount of water to flow out of the chamber and into the trap. The intermittent water flow to the trap ensures a minimum volume for maintaining a gas tight seal in the trap.