Plug valve EH

manualshut-offfor control

Fisher EH series valves are specially designed for high-pressure applications. These valve configurations incorporate proven techniques in flow-stream contouring for higher capacities and in valve trim design for reliability in severe applications. Key Features Improved Cage Design – Drilled-hole cages, offering excellent strength and additional resistance to destructive vibration, are standard. Special materials of construction are readily available. Piping Economy – The availability of expanded end connections on EH valves may eliminate the need for line swages while accommodating oversized piping arrangements. 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 232C (450F). O-ring construction is standard on EHT valves. The flat sheet seat ring gasket construction is available for elevated design temperatures and/or NACE constructions where a suitable O-ring material is not available. 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 ASME Intermediate Special Ratings, which allow even higher pressure/temperature applications. See table 7 for specific ratings. Long Trim Life – Hardened materials of construction for the cage, valve plug, cage guiding, and other trim parts are standard for all applications, providing excellent wear resistance. In all applications, rugged cage guiding provides increased valve plug stability.