Diaphragm valve with leak detection

申请公布号：

US5967173(A)

申请号：

US19970914058

申请日期：

1997.07.14

申请公布日期：

1999.10.19

申请人：

FURON CORPORATION

发明人：

KINGSFORD, KENJI A.;NGUYEN, HY BA

分类号：

F16K7/12;F16K7/17;F16K11/048;F16K41/12;(IPC1-7):F16K11/48;F16K31/126

主分类号：

F16K7/12

摘要：

A valve assembly comprises a valve body and at least one valve seat is disposed within the valve body. A groove is disposed therein concentrically around the valve seat. A poppet assembly is disposed within the valve body and comprises an imperforate valve stem and a valve plug at an end of the valve stem. For three-way flow, the valve body includes two valve seats, and a valve plug at each valve stem end. A cap is attached to an end of the valve body top and a first flexible imperforate diaphragm is disposed within the cap. A second flexible imperforate diaphragm is disposed within the valve body between the poppet assembly and the first diaphragm, and forms a leak-tight seal with the valve body. A base is attached to an opposite end of the valve body. A third flexible imperforate diaphragm is disposed in the valve body between the poppet assembly and the base, and forms a leak-tight seal with the valve body. A spring means is disposed between the base and the third diaphragm for imposing a biasing force onto the poppet assembly. A containment body is used to encapsulate the spring means and isolate it from any liquid that leaks past the third diaphragm.