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Diaphragm Seal Manufacturing

PCI manufacture a wide range of diaphragm seals for hygienic and chemical applications. Our diaphragm seals are made to suit the pressure sensing instrument and the application. Our most common diaphragm seals are made from stainless steel grade 316L which is the standard material for the pharmaceutical industry. Using our own CNC lathes combined with computer controlled welding equipment enables us to produce the highest quality diaphragm seals.
 
       
We manufacture exotic metal diaphragm seals. Exotic metal diaphragms are often required for aggressive applications were stainless steel would not be suitable. Using a specialist CNC welding process, we can weld exotic metal diaphragms such as Tantalum to a stainless steel body. This is far more economic than producing the full flange body in exotic material. These are often required within the Nuclear, Oil+Gas and Chemical industries. Examples of exotic metals include:
Tantalum, Titanium, Hastelloy, Inconel and Monel.
 

We also offer special coatings such Gold, Rhodium, PFA and PTFE. 
 
Design Comparison
 
              
      A PCI Diaphragm Seal    VS    A Non PCI Diaphragm Seal
 
Low volume capacity
Reduced fill fluid volume reduces possibility of
temperature induced measurement errors. Minimises potential process contamination.
 
High volume capacity
High volume capacity means greater probability of
pressure indication errors caused by temperature. Greater process contamination when ruptured.
Backup diaphragm convolution
Helps the diaphragm maintain its original form.
Protects the diaphragm against rupturing.
 No backup diaphragm convolution
Leaves the diaphragm vulnerable to rupture should
a pressure over load take place.
Recessed diaphragm
Protects the diaphragm from installation damage.
Minimises gasket induced errors.
 
Protruded diaphragm
Leaves the diaphragm vulnerable to installation damage.
Increases chances of gasket induced errors.
 
 
Diaphragm Helium Leak Testing
 
All our diaphragm seals are helium leak tested up to 10x-10 mbar l/s to ensure there are no microscopic holes that could lead to instrument failure or a fill fluid leak contamination into the process medium.