SANITARY DIAPHRAGM VALVE

WIPO Patent Application WO2001073327

A3

A sanitary diaphragm valve (10) is provided that includes a generally dome shaped diaphragm (E) having a central boss that can be connected to or driven by a valve actuator (D). The diaphragm includes an outer peripheral edge and a relatively thin web portion (16) that connects the boss to the outer edge. In one embodiment, the web portion is arcuate or dome shaped. The thinner web portion (34) permits the diaphragm to have an extended cycle life and to permit the valve to operate at higher fluid pressures. The thin web may be defined by two different contoured surfaces, one convex and the other concave, such as formed by two radiuses. A valve body (F) is provided that includes a bowl shaped valve cavity (K). This valve cavity includes an outer vertical edge to permit more thorough cleaning and to eliminate entrapment areas. The valve assembly provides support surfaces for the diaphragm that reduces stress on the diaphragm particularly at higher operating pressures. A deep bowl embodiment (300) is provided in which the valve cavity (308) is defined by a spherical and preferably a hemispherical surface (302) with the cavity diameter being about the same as the diaphragm diameter. The diaphragm for the deep bowl design has a stem tip that seals one of the valve ports radially outward from the port. The port may include a chamfered valve seat adjacent the port, and the port may be formed by a conical bore.

BROWNE RONNIE A (US)
KERG DAVID C (US)

PCT/US2001/009116

March 07, 2002

March 22, 2001

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SWAGELOK CO (US)
BROWNE RONNIE A (US)
KERG DAVID C (US)

F16K7/16; F16K7/17; F16K7/12; F16K31/122; F16K41/12; (IPC1-7): F16K41/12; F16K7/16

US5222523A	1993-06-29
DE3123028A1	1983-01-05
US5333643A	1994-08-02
US5265843A	1993-11-30

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