Trap primer

摘要

An embodiment providing one or more improvements includes a trap primer with upper and lower chambers separated by a flexible diaphragm which also interacts with a valve stem to start and stop the flow of water from the trap primer to the trap(s). The lower chamber contains a polymeric foam medium such as a foam ring containing closed cells containing gas or gases. In use, equilibration of water pressures in the upper and lower chambers causes distortion of the foam ring, resulting in equilibration of the gas pressure in the closed cells with that of the chambers. A decrease in line water pressure causes water from the lower chamber to be emitted into the traps.

主权项

1. A trap primer for maintaining water levels in a drain trap in a building having a water supply line comprising:
a connection to the building water supply line, an upper chamber, an anti-oscillating valve located between the supply line and the upper chamber. a lower chamber having a bottom and a circumferential upper edge, the upper and lower chambers separated by a free floating flexible diaphragm, a valve stem extending vertically from the bottom to the upper edge of the lower chamber, the valve stem having a bore with an orifice at the upper end, and a port leading to a trap at the lower end, the diaphragm reversibly sealing the valve stem orifice, and a resilient gas enclosure located in the lower chamber.