Self Relieve Seat

This feature is designed to prevent excessive pressure build up within the valve by automatically,relieving pressure
when body cavity pressure exceeds the spring load on the seats.
Double Piston Seat is also available as and option.

Self Ring Sealing

Two o-rings or one each of an o-ring and graphite ring are used for pressure classes 150 through 600.
One lip seal with an o-ring or graphite ring is used for the pressure class 900 up to 2500.

Sealant Injection Fitting

This feature in standard except in sizes 2”~4” for pressure class 150, 300 and 600
In case of seat ring damage, sealant injection provides a fast, reliable way to restore tight sealing.
This injection system can also be used for routine flushing of the seat ring area white in service.

Stem Seal & Sealant Injection

Two o-ring and graphite packing are used for pressure classes 150 through 600.
One each of lipseal and o-ring plus graphite packing are used for pressure classes 900 through 2500.
In case of damage to the o-ring lipseat, sealant injection stops leaking and restores tight sealing.

Double Block and Bleed

Trunnion ball valves provide a positive seal at both upstream and downstream independently
Since pressure on each side of the ball is blocked from the body cavity, a pressure releasing device
can be used by an operator to check the integrity of the upstream and downstream seats.