Complete Conversion to O-Ring Covers

We can also perform a complete conversion to O-ring covers using a direct-loading design in which an O-ring bore is machined in the cylinder. Cover studs seat the valve gasket and no other loading devices are required.


  • Completely eliminates the gasket seal
  • Uses existing cylinder studs to seat the valve gasket
  • Eliminates one of the two cover seals Requirements


  • Cylinder must be machined to achieve the concentricity and finish required to seal the O-ring
  • Requires replacement of the cover and cage
  • Cylinder studs often need to be redesigned to avoid damaging the valve shelf area
  • Re-hydrotesting upon completion 

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