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ET Valve
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Fisher Valves
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Product description
Fisher™ ET, EAT, and ETR Sliding-Stem Control Valves
Fisher ET, EAT, and ETR general-purpose control valves (figures 2, 3, and 4) are used for throttling or on-off control of a wide variety of liquids and gases. All three valve designs have single ports, balanced valve plugs, and cage guiding. Metal-to-PTFE seating for stringent shutoff requirements is standard in all valves except those with Cavitrol III cages. Metal-to-metal seating for higher temperatures is standard for valves with Cavitrol III cages and optional for all other valves.
The temperature limits of ET valves can be extended above 232C (450F) 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 316C (600F) for non-oxidizing service and to 260C (500F) for oxidizing service.
The ET product line is available for a wide range of applications, including sulfide and chloride stress-cracking environments common to the oil and gas production industries. To discuss available constructions, contact your Emerson sales office and include the applicable codes and standards required for these environments.
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