Patent ID: 9605764
Date: 2017-03-28
CPC Classifications: F16K,Y10T

Claim:
1. A liquid pressure control valve including a body forming a cavity and incorporating an inlet port and an outlet port joining to the cavity and forming a flow path for a liquid through the body, a flexible member retained within the cavity to extend over the inlet port to separate the inlet port from the outlet port and to also form a chamber separated from the outlet port, a bleed passage joining the inlet port to the chamber, in a closed position of the liquid pressure control valve, whereby pressure in the chamber will displace the flexible member toward the closed position with a seal of the flexible member seated over the inlet port, within an open position the bleed passage venting the chamber, characterised in that a slide is mounted within the cavity and is coupled to a section of the flexible member surrounding the seal of the inlet port, the slide is formed of a rigid material and is configured to be displaced with displacement of the flexible member, and a stop provided to prevent closing displacement of the slide after the flexible member has seated and sealed over the inlet port in the closed position, wherein the flexible member is in the form of a diaphragm with a diaphragm body retaining an outer peripheral section of the diaphragm, the diaphragm including a central dished section surrounded by an annular wall section disposed substantially normal to the central dished section with a junction of the annular wall section and the central dished section forming the seal, the slide being coupled to the annular wall section of the diaphragm to enable the diaphragm in the open position to move the slide out of the flow path to achieve maximum fluid flow through the outlet port, wherein a section of the diaphragm adjacent to the outer peripheral section incorporates at least one annularly disposed wave formation to facilitate longitudinal displacement of the central dished section of the diaphragm.