Fisher ET, EAT, and ETR general-purpose control valves (figures 1, 2, and 3) 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 CavitroltIII cages. Metal-to-metal seating for higher temperatures is standard for valveswith Cavitrol III cages and optional for all other valves.
ET, EAT, and ETR control valves are part of the versatile easy-e family of Fisher industrial control valves. easy-e valves share the following characteristics:
Multiple trim material choices
Interchangeable, restricted-capacity trims and full-sized trims to match variable process flow demands
Different cage/plug styles that provide particular flow characteristics for highly-specialized applications. The standard cage comes in three different flow characteristics:J quick-opening, J linear, orJ equal percentage.
Whisper TrimtI, Whisper Trim III (figure 6), and WhisperFlotcages (figures 4 and 5) attenuate
aerodynamic noise in gaseous service.
To help eliminate cavitation damage in a properly-sized valve, a standard-travel, Cavitrol III, one-stage cage (figure 8) and a long-travel, Cavitrol III, two-stage cage are available in the NPS 1 throughNPS 8 ET control valve.