Anti-syphon flow control valve

• US 4,508,136 A
• Filed: 09/29/1982
• Issued: 04/02/1985
• Est. Priority Date: 09/29/1982
• Status: Expired due to Fees

• Current Assignee: Carl L.C. Kah Jr
• Original Assignee: Carl L.C. Kah Jr
• Inventors: Kah, Carl L. C. Jr.
• Primary Examiner(s): Michalsky, Gerald A.
• Application Number:
  US06/426,375
• Time in Patent Office: 916 Days
• Field of Search: 137/218, 137/512.15, 137/217, 137/512.4, 251/46
• US Class Current: 137/218
• CPC Class Codes: F16K 31/402 acting on a diaphragm
• CPC Class Codes: Y10T 137/3294 Valved
• CPC Class Codes: Y10T 137/3331 With co-acting valve in liquid flow path
• CPC Class Codes: Y10T 137/7843 Integral resilient member forms plural valves

Abstract

A liquid flow control valve having a valve seat and a valve plug for engaging said valve seat, said plug being connected to a pressure responsive device, such as a diaphragm, for movement therewith, said control valve being opened and closed by forces acting on opposite sides of said diaphragm, an anti-syphon valve located below said diaphragm for directing air into said flow control valve when a suction occurs at the inlet to said valve seat; said anti-syphon valve comprising an annular array of flaps which control the flow of air through openings in the body of said liquid flow control valve. Said flaps can be arranged to also provide a barrier to reverse flow from the liquid flow control valve exit through said valve seat to its inlet. Said liquid flow control valve can be of the pilot valve operated type or manually operated.

Claims

1. A flow control valve having a housing including an inlet and an outlet, a liquid valve means between the inlet and the outlet, said liquid valve means comprising a valve seat and a valve plug means for engaging said valve seat, a pressure responsive diaphragm mounted in said housing above said plug means, said plug means being connected to said pressure responsive diaphragm for movement therewith, said plug means being moved between an open and closed position by forces acting on opposite sides of said pressure responsive diaphragm, a first chamber being formed above said pressure responsive diaphragm with said housing, a second chamber being formed below said pressure responsive diaphragm with said housing, a diaphragm support ring being positioned in said second chamber to support said diaphragm when said liquid valve means has its valve plug means in its closed position, said valve seat opening into said second chamber, a first conduit means connecting said valve seat to said inlet, a second conduit means connecting said second chamber to said outlet, opening means connecting the exterior of said housing to said second chamber, anti-syphon valve means cooperating with said opening means to connect the exterior of said housing to said second chamber and valve seat when a suction occurs in said inlet, said anti-syphon valve means having valve flap means extending downwardly into said second chamber, said flap means cooperating with said opening means in said housing to normally close said opening means, said flap means being pulled inwardly into said second chamber when a suction occurs, said flap means contacting the first conduit means in their innermost position to block a reverse flow from the outlet to the inlet, said diaphragm support ring being position on projections extending inwardly from said housing, each projection extending between a pair of adjacent flaps, said flaps having notches to receive said projections, said flap notches engaging the sides of said cooperating projections when said flaps have been pulled inwardly.