Design EH and EHA Control Valves
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The temperature limits of Design EHT valves can be extended above 232°C (450°F) by using PEEK PolyEtherEtherKetone) anti-extrusion rings in combination with a spring-loaded PTFE seal.
The PEEK anti-extrusion rings expand to close off the clearance gap between the plug and the cage where the PTFE seal may extrude at high temperatures and pressures.
The temperature limits are extended to 316°C (600°F) for non-oxidizing service and to 260°C (500°F) for oxidizing service.
- Improved Cage Design — Drilled-hole cages, offering superior strength and additional resistance to destructive vibration, are standard.
Special materials of construction are readily available. - Optional O — ring Seat Ring Gasket
- Construction — Use of O-ring construction provides excellent shut-off with minimal seat ring installation torques for temperatures up to 232°C (450°F).
O-ring construction is standard on Design EHT valves. - Increased Pressure/Temperature Ratings — Steel EH and EHA valves with buttwelding end connections have Intermediate Standard Ratings. With nondestructive testing, these valves can conform to ANSI Intermediate Special Ratings,which allow even higher pressure/temperature applications.