Procedure and test
- ANSI rule for fitting, valve-flanged
- API rule Seat Tightness of pressure
- ASME rule for installation and operation
The trip parts is devided into two of the guided single seat Type of cage ballanced single seat type
The extension bonnet allow gor use of cyogenic service up to -196°C
The actuators are designed compactly as multi-spring diaphram operated type, and permit high thrust.