SELF SHUTTING-OFF VALVE FOR WATER PASSAGE WITH BLOCKED WATER PASSAGE

摘要

PURPOSE: A self shutting-off valve for a water passage is provided to maximize the water saving by forcibly shutting off the water passage. CONSTITUTION: A self shutting-off valve for a water passage comprises a housing(10) having a main water passage(13) which connects an inlet(12) and an outlet(14) and has a pressure chamber(16) at a side of a center part thereof; a piston valve body(30) installed to the pressure chamber to open or close the main water passage; a pusher(40) connected to the piston valve body and extended to the outside of the housing; auxiliary water passages(50) communicating the inlet to the pressure chamber; forcing water passages(70,76) which is arranged in the housing and which communicates the inlet to the pressure chamber; an auxiliary valve body(80) supported by a spring(82) to close the forcing water passages; and an auxiliary pusher(90) installed at the outside of the housing to close the open the forcing water passages by pushing the auxiliary valve body.