Data Sheet

GX Control Valve and Actuator
D103171X012
Product Bulletin
51.1:GX
March 2012
2
Figure 1. Fisher GX Control Valve Assembly with Port-Guided Contoured Plug (Port Sizes 36 to 136 mm)
W8568-1A
COMPACT FIELD-REVERSIBLE
MULTI-SPRING ACTUATOR
INTEGRATED POSITIONER
MOUNTING
NAMUR POSITIONER
MOUNTING CAPABILITY
ONE-PIECE SCREWED
PACKING FOLLOWER
CLAMPED BONNET DESIGN
STANDARD LIVE-LOADED PACKING
INTEGRAL PNEUMATIC PASSAGEWAYS
Optimized valve and actuator system. Product
simplicity and ease of selection form the foundation of
the GX. Mounted with a digital or analog positioner,
the GX provides high performance control across a
wide range of process applications.
Compact actuator design. The GX utilizes a compact,
multi-spring actuator. The GX design has been
optimized to eliminate complicated actuator sizing
procedures - once the valve body, port size, and air
supply pressure are selected, the actuator size is fixed.
Modular design. The design architecture has been
optimized to maximize the use of common parts
across sizes. The actuator stem and stem connector
are used across all GX sizes. The GX actuator uses a
total of 5 different springs across all valve sizes. These
spring sets have been optimized to allow for maximum
application coverage. The plug/stem assemblies and
packing sets are common across several sizes, as well.
Low lifetime costs. Reduced product complexity, low
parts count, and part commonality all contribute to
reduced inventory and maintenance costs.
Contents
Features 1.....................................
Principle of Operation 4.........................
The Fisher GX Control Valve 6....................
Fisher GX Control Valve Specifications
and Materials of Construction 7................
GX Cavitrolt III for DN25 (NPS 1) through
DN50 (NPS 2) 14.............................
GX Whisper Trimt III for DN80 (NPS 3) through
DN150 (NPS 6) 14............................
The Fisher GX Diaphragm Actuator 15.............
GX ISO 5210 Electric Actuator Mounting 16.........
Bellows Extension Bonnet 16.....................
Valve-Actuator Dimensions and Weights 21........
Fisher GX Actuator Accessories 23.................
The Fisher FIELDVUE DVC2000
Digital Valve Controller 23.....................
Optional Positioners and Instruments 24...........
Manual Handwheels 25..........................
Coefficients 27.................................