JPS5520903A - Hot water valve - Google Patents

Abstract

PURPOSE: To allow a hot water valve to be opened by low force against high water pressure at an inlet thereof by forming the valve body cylindrical with openings at both ends and sealing the end surfaces from the inner peripheral surface to thereby eliminate the adverse effect of the pressure difference between the upstream zone and the downstream zone of the valve body.

CONSTITUTION: A cylindrical valve body 14 with upstream and downstream openings 15 and 16 is provided in a fluid passage 13. A shaft 5 is mounted at the end of the opening 15, and a diaphragm 6 is secured to the shaft 5. The end of the valve body 14 at the opening 16 side makes contact with the inner wall of the passage 13 to thus form a valve seat 17. A guide 18 is stood from the inner wall of the passage 13, and inserted into the inner periphery of the valve body 14. When vacuum operates the vacuum chamber 7, fluid flows into the gap between the valve seat 17 and the seat 14 to thereby control the flow rate according to the amplitude of the vacuum by the cutout 19 of the guide 18. The pressure receiving area of the valve body 14 is only the sectional area at the end thereof to thus allow the valve to be opened by low force against high water pressure.

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