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The easy-e™ Valve Family 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
Controls or Helps to Eliminate Cavitation Damage—Cavitrol III trim can lengthen valve service life and reduce maintenance downtime. The shape and spacing of holes in the cage wall circumference helps prevent cavitation in a properly sized valve, effectively controlling or helping to eliminate (depending upon service conditions) cavitation
Fisher micro trims are used in those applications where the control of low flow rates is a requirement. A variety of micro trims are offered that provide application solutions for standard and severe service conditions. This bulletin lists the various micro trims available and their service capability. Trim Descriptions: An Overview
Cage-type trim allows removal and inspection of parts without taking the valve body out of the pipeline. Cavitrol III one-stage trim is interchangeable with standard trims.
HP Series high‐pressure globe and angle valves (figure 1) have metal seats, cage guiding, quick change trim, and push‐down‐to‐close valve plug action. HPD, HPAD, HPT, and HPAT valves use balanced valve plugs.
Port Guided Trim Design Challenge: Significant trim wear in early life Solution: Equal capacity at less travel enables compact size. Smaller stem required produces less friction Lateral stability reduces vibration. Plug seating surface Guide leg * Greater than 20,000 cycles with 20lb. side stem load. Unlikely to be duplicated in service.
Figure 4: This Fisher easy-e globe valve assembly utilizes an equal percentage trim. Mark notes that quick opening valves do not usually work well as control valves but can be utilized for drain/vent applications to provide high flows quickly.
