DIAPHRAGM VALVE WITH DUAL POINT SEAL AND FLOATING DIAPHRAGM WEB

摘要

A high purity valve (10) includes a valve body (12) having an inlet (40) and an outlet (42) separated by a valve seat (32), and a diaphragm (22) having a central stem (23) that has a first end coupled to a piston (20) for actuating the valve, and a poppet (28) for engaging the valve seat to close the valve. The poppet forms a dual point seal (50/52, 50′/52′) with the valve seat having at least two points of contact between an annular surface (30) of the poppet and the valve seat. The annular surface of the poppet may be either a concave surface or a convex surface that provides the dual point seal. The valve has a retainer (14) adjacent the diaphragm, and the diaphragm has a flexible web (26) that extends radially outward from the central stem. The retainer has a surface (60) adjacent the web, and the surface is spaced apart from the web such that the web does not contact the surface when the valve is pressurized.

主权项

1. A valve comprising:
a valve body having an inlet and an outlet separated by a valve seat; and a diaphragm comprising a central stem that has a first end coupled to a piston for actuating the valve, and a second end that comprises a poppet for engaging the valve seat to close the valve; wherein the poppet forms a dual point seal with the valve seat having at least two points (50/52, 50′52′) of contact between an annular surface of the poppet and the valve seat.