1. General Introduction
Fisher ES general purpose control valve is the unbalanced plug type used for throttling or on-off control of a wide variety of liquids and gases, designed with single ports, unbalanced valve plugs, and cage guiding. Metal-to-metal seating is standard for all general applications over a wide range of pressure drops and temperatures, Metal-to-PTFE seating is optional for more stringent shutoff requirements, which is available for a wide range of applications, including sulfide and chloride stress-cracking environments common to the oil and gas production industries. Trim temperature capability with standard metal seats to 427 ℃, with flexible graphite gaskets and interchangeable, restricted-capacity trims and full-flow trims to match variable process flow demands. It mainly come with typical features as below:
Unbalanced Valve Plug Construction & Cage guide: Rugged cage guiding provides high valve plug stability, which reduces vibration and mechanical noise.
Standard three different flow characteristics: quick-opening, linear and equal percentage.
Class V or Class VI Shutoff: Higher leakage rate compare to ED series.
Multi material selectable: Carbon Steel, Stainless, Alloy
Process Connection Type: Flanged, Butt Weld, RTJ, Threaded, Socket Weld
Easy Maintenance: Interchangeable seat with ED and ET series, also can stay in the pipeline during removal of trim parts for inspection or maintenance.
2. Comparable table of Fisher E series Valve
Type | Guide type | Plug type | Shut off | Temperature | Soft Seat | Seal Ring | Others |
ED | Cage | Balanced | II to III | 427℃ | No | Graphite | C seal |
ET | Cage | Balanced | IV-V | 204℃ | Yes | PET | |
ES | Cage | Un-Balanced | VI | 538℃ | Yes | No | |
EZ | Cage/guide | Un-Balanced | VI | 427℃ | Yes | No | |
Notes: | 1. Dimension and pressure rating of E series valve is same, thus valves can be interchanged, but internal parts are different. | ||||||
2. E series valves are top guided type, also easy remove and change internal parts for maintenance. |
3. ES series Port Diameters, Valve Plug Travel, and Stem and Yoke Boss Diameters
Full-Sized Trim [NPS] | Port Diameter [mm] | Valve Plug Travel [mm] | Standard Stem [mm] |
1 | 33.3 | 19 | 9.5 |
1 1/2 | 33.3 | 19 | 9.5 |
2 | 58.7 | 29 | 12.7 |
2 1/2 | 73.0 | 38 | 12.7 |
3 | 87.3 | 38 | 12.7 |
4 | 87 | 51 | 12.7 |
6 | 177.8 | 51 | 19.1 |
8 | 203.2 | 76 | 19.1 |
4. Typical section drawings for ES series
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