Diaphragm and hydraulically-operated valve using same

Abstract

The present invention relates to fluid control valves. The invention provides an improved diaphragm useful for a large hydraulically-operated valve or pressure regulating valve of the type used in pipelines to transport water, oil, gas, acids, alkalis and other fluids. The diaphragm being provided with an upper face arranged to be exposed to a control hydraulic pressure and a lower face arranged to selectively seal and open a passage between a valve inlet and a valve outlet, ribs on said upper face urging the diaphragm towards a sealing position. The diaphragm being characterized by the addition of an elastomer ring element disposed adjacent to the upper face and adjacent to the largest diameter of the diaphragm exposed inside a valve to which it may be assembled, an upper face of the flexible ring element being in pressure contact with a portion of the rigid body of the valve. The flexible ring element further urging the diaphragm towards its lower position and allowing closure of the valve without use of a metallic compression spring.

1 . An elastomer diaphragm for use in a hydraulically-operated valve and in a hydraulic pressure regulator, said diaphragm being provided with an upper face arranged to be exposed to a control hydraulic pressure and a lower face arranged to seal and open a passage between a valve inlet and a valve outlet, ribs on said upper face urging said diaphragm towards a sealing position, said diaphragm being characterized by the addition of an elastomer ring element disposed adjacent to said upper face and adjacent to the largest diameter of the diaphragm exposed inside a valve to which it may be assembled, an upper face of said flexible ring element being in pressure contact with a portion of the rigid body of said valve, said flexible ring element further urging said diaphragm towards its lower position and allowing closure of said valve without use of a metallic compression spring.  
   
   
       2 . The elastomer diaphragm as claimed in  claim 1 , wherein said flexible ring element has a circular cross-section.  
   
   
       3 . The elastomer diaphragm as claimed in  claim 1 , wherein said flexible ring element has a trapezoidal cross-section.  
   
   
       4 . The elastomer diaphragm as claimed in  claim 1 , wherein said flexible ring element has a V-shaped cross-section.  
   
   
       5 . The elastomer diaphragm as claimed in  claim 1 , wherein said flexible ring element and said diaphragm are separate components.  
   
   
       6 . The elastomer diaphragm as claimed in  claim 1 , wherein said flexible ring element is produced as part of an integral diaphragm molding.  
   
   
       7 . A hydraulically-operated valve fitted with a diaphragm as claimed in  claim 1.