Fisher GX Control Valve UK & Ireland | ESI Technologies Group

Fisher GX Control Valve

The Fisher GX Control Valve and actuator system can meet a wide range of flow and pipeline sizing requirements. The GX Design is a single port, a flow-up globe-style valve that offers stem-guided, port-guided, and balanced trim with a screwed-in seat ring (see table below for a description of trim style availability). Each valve size offers an unbalanced plug design, which eliminates dead spaces where fluid polymerization might occur

Sizes DN80, 100, and 150 (3-, 4-, and 6-inch) also offer balanced trim to reduce actuator thrust requirements.

The Design GX incorporates a clamped bonnet and an easy-to-adjust screwed packing follower. The plug and stem are a rugged, one-piece welded assembly.

The standard construction incorporates metal-to-metal seating, with a PTFE soft seat option for Class VI shutoff. Class V shutoff is available with metal trim. Hardened trim with stellite overlay is available for erosive service, as well. PTFE V-ring stem packing is standard with the GX.

Product Benefits

Easy to size and select.
No actuator sizing required; one actuator per port diameter minimises selection errors
Optimized actuator allows for a wide range of air supply.
Engineered for easy maintenance.
Maximum part commonality across sizes – fewer recommended spare parts in inventory
Trim is replaceable.
Low lifetime costs.
Robust, low-profile design.

Features

The live-loaded system provides excellent stem sealing and extended service life. Live-loaded graphite ULF packing and extension bonnets are available for high-temperature applications. Both linear and equal percentage flow characteristics are available in full port and restricted trim. Micro-FlowTM is available for applications requiring low flow control capability.

Standard valve body materials are carbon steel and stainless steel. Alloy materials are available for valve body sizes DN 15 through DN 100 (0.5 through 4-inch) for highly corrosive applications.

Integrated Air Supply. When mounted with the DVC2000 Series digital valve controller, the Design GX uses an integrated actuator air supply system

In the air-to-open construction, the air is supplied to the lower actuator casing via a port on the actuator yoke face — no tubing is required

In the air-to-close configuration, the air is supplied to the upper casing via tubing.

The design architecture has been optimised to maximise the use of common parts across sizes.

The actuator stem and stem connector are used across all GX sizes.

Application

The GX product line lets you meet a wide range of flow and pipeline sizing requirements.

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