Self:sealing valve for domestic water tap - has spring:biased valve piston on control spindle screwed away from seat

摘要

The self-sealing valve is used in a domestic water tap. The seal (12) is an apertured disc which is sandwiched between the valve piston (11) and the valve seat (21) when the valve is closed. There is a spring (22) inside a tubular piston guide which biases the valve into a closed position. The valve insert is screwed into a dividing wall (41) across the tap flow outlet. A handle (34) is connected to the upper end of a control rod (32) which pushes the valve piston (11) down, opening the flow channel. The piston can rotate freely relative to the control spindle (11), and a threaded bush (31) caps the tap spindle opening, preventing leakage there.