Emerson Fisher GX Data Sheet

Product Bulletin

51.1:GX 3--Way
D103305X012
August 2011

GX 3--Way Valve and Actuator

Fisherr GX 3-Way
Control Valve and Actuator System

The Fisher GX 3-Way is a compact, state-of-the-art
control valve and actuator system, designed to
accurately control water, oils, steam, and other
industrial fluids. The robust GX 3-way valve package
is perfectly suited to address the space limitations of
the OEM industry.

The GX 3-Way is rugged, reliable, and easy to
select. The internal valve trim is designed to ensure
long service life and avoiding unnecessary
maintenance. The same construction may be used
for both converging and diverging applications.

The GX 3-Way meets the requirements of both EN
and ASME standards. It is available with a complete
accessory package, including the FIELDVUEt
DVC2000 integrated digital valve controller.

The GX 3-Way trim characteristics are designed for
accurate temperature control in heat exchanger
applications.

D Side-Port Common (SPC)----The side flange is

the common pipe connection for general converging
(flow-mixing) and diverging (flow-splitting) service
(see figure 5). Utilizes an unbalanced plug design.

D Bottom-Port Common (BPC)----A balanced

design used for high nP applications. The bottom
flange is the common pipe connection for both
converging and diverging service (see figure 9).

D High--Temperature Side--Port Common

(SPC)-- -- The side flange is the common pipe

connection for general converging (flow-mixing) and
diverging (flow-splitting) service (see figure 3).
Utilizes an unbalanced plug design, a stem
extension, a yoke extension, and includes
live--loaded ULF graphite packing and a hard--faced
seat ring.

W9557

www.Fisher.com

GE49204
X0176

GX 3--WAY

Figure 1. Fisher GX 3-Way Control Valve, Actuator, and FIELDVUE DVC2000 Digital Valve Controller

GX 3--WAY HIGH--TEMPERATURE

GX 3--Way Valve and Actuator

CLAMPED BONNET DESIGN

Product Bulletin

51.1:GX 3--Way
August 2011

COMPACT FIELD-REVERSIBLE
MULTI-SPRING ACTUATOR

INTEGRATED POSITIONER
MOUNTING

NAMUR POSITIONER
MOUNTING CAPABILITY

ONE-PIECE SCREWED
PACKING FOLLOWER

STANDARD LIVE-LOADED
PACKING

W9578-1

Figure 2. Fisher GX 3-Way Control Valve Assembly with Port-Guided Contoured Plug (Side Port Common)

COMPACT FIELD-REVERSIBLE
MULTI-SPRING ACTUATOR

CLAMPED BONNET DESIGN

INTEGRATED POSITIONER
MOUNTING

NAMUR POSITIONER
MOUNTING CAPABILITY

STEM EXTENSION

YOKE EXTENSION

ONE-PIECE SCREWED
PACKING FOLLOWER

STANDARD GRAPHITE ULF
LIVE-LOADED PACKING

GRAPHITE SEAL RING

X0094--1

HARD--FACED SEAT AND GUIDE
SURFACES ON SEAT RING

Figure 3. Fisher GX 3-Way High--Temperature Control Valve Assembly with Port-Guided Contoured Plug (Side Port Common)

2

Product Bulletin

51.1:GX 3--Way
August 2011

GX 3--Way Valve and Actuator

Contents

Features 3.................................

Principle of Operation 10.....................

GX 3-Way Control Valve Specifications

and Materials of Construction 11...........

The GX 3-Way Diaphragm Actuator 14........

Valve-Actuator Dimensions and Weights 17....

GX 3-Way Actuator Accessories 19...........

The FIELDVUE DVC2000

Digital Valve Controller 19.................

Optional Positioners and Instruments 20.......

Coefficients 21.............................

Features

D Easy to size and select

D No actuator sizing required--selection is

automatic

D Engineered for easy maintenance

D Maximum part commonality across sizes

D Replaceable trim

D Low lifetime costs

D Robust, low-profile design

D Available with integrated, easy-to-calibrate

DVC2000 digital valve controller

D Valve body sizes DN 25 to DN 100

(NPS 1 through 4)

D Pressure Classes PN 10-40,

CL150 and 300

D High capacity design

D Valve body flow passage optimized for flow

stability

D Shutoff capabilities: Class IV metal to metal

D ISO 5210 F7 mounting available for use with

electric actuators

3

GX 3--Way Valve and Actuator

LINKAGE-LESS POSITION
FEEDBACK

Product Bulletin

51.1:GX 3--Way
August 2011

INTEGRAL PNEUMATIC
PASSAGEWAYS

DVC2000
COVER

PUSH-BUTTON INSTRUMENT
SETUP

Figure 4. Fisher GX 3-Way and FIELDVUE DVC2000 Digital Valve Controller

Optimized valve and actuator system. Product
simplicity and ease of selection form the foundation
of the GX 3-Way. Mounted with a digital or analog
positioner, the GX 3-Way provides high performance
control a cross a wide range of process applications.

Compact actuator design. The multi-spring GX
3-Way actuator is a compact robust design. The GX
3-Way design has been optimized to eliminate
complicated 3-way actuator sizing procedures - once
the valve body and port size are selected, the
actuator size is fixed.

Reliable Actuator Performance. Special actuator
diaphragm material helps reduce common problems
such as air o xidation, thermal aging, low
temperature embrittlement, and loss of retention.
The double-sided diaphragm within the a ctuator
helps eliminate mechanical wear-induced failure.

Modular design. The design architecture has been
optimized to maximize the use of common parts

across sizes. The actuator stem and stem connector
areusedacrossallGX3-Way sizes.

Low lifetime costs. Reduced product complexity,
low parts count, and part commonality all contribute
to reduced inventory and maintenance costs.

Stable flow control. The flow cavity of the GX
3-Way valve body has been engineered to provide
stable flow and reduce process variability. This linear
stability for both converging and diverging flow is
perfectly suited for temperature and pH control
applications.

Live-loaded packing. The GX 3-Way comes with
live-loaded PTFE V-ring packing as standard. The
live-loaded design helps to seal your process to
conserve valuable process fluid, while reducing
emissions to the environment. The long-life and high
reliability of the live-loaded system also reduces
maintenance costs and process downtime. ULF
(ultra low friction) graphite packing is also available
for all sizes and is standard on HT (high
temperature) construction.

4

Product Bulletin

51.1:GX 3--Way
August 2011

GX 3--Way Valve and Actuator

Easy maintenance. The simple screwed seat-ring
and one -piece plug and stem design provide easy
maintenance. Design simplicity and parts
commonality contribute to reduced spares inventory.
The integrated DVC2000 digital valve controller
allows easy instrument removal, without a
requirement for tubing disconnection or replacement
(fail-down construction).

Digital valve controller. The GX 3-Wayisavailable
with the DVC2000 digital valve controller. The
DVC2000 is easy to use, compact, and designed for
easy mounting. It converts a 4-20 mA input signal
into a pneumatic output signal, which feeds the
control valve actuator. Instrument setup is performed
with a push button and liquid crystal display (LCD)
interface. This interface is protected from the
environment within a sealed enclosure. The interface
supports multiple languages, including German,
French, Italian, Spanish, Chinese, Japanese,
Portuguese, Russian, Polish, Czech, Arabic, and
English.

Intrinsic safety and non-incendive construction is
available to CSA, FM, ATEX, and IEC standards. An
optional module p rovides integrated limit switches
and a position transmitter.

Integrated mounting. The DVC2000 digital valve
controller integrally mounts to the GX 3-Way
actuator, eliminating the need for mounting brackets.
The DVC2000 transmits a pneumatic signal to the
actuator casing via an air passage in the yoke leg,
causing the valve to stroke (see figure 13). This
eliminates the need for positioner-to-actuator tubing
in the fail-down configuration.

The DVC2000 mounting interface is identical on both
sides of the actuator yoke for valve body sizes DN
25 through DN 100 (NPS 1 through 4). This
symmetrical design allows the DVC2000 to be easily
moved from one side of the valve to the other
without the need to rotate the actuator.

Linkage-less feedback. The DVC2000 digital valve
controller offers as standard a non-contacting valve
position feedback system. This is a true linkage-less
design, which uses no levers and no touching parts
between the valve stem and the positioner.

Additional Accessory selection. The GX 3-Way is
available with a variety of digital or analog
positioners besides the DVC2000, as well as
solenoid and limit switches. The actuator is also
compatible with the IEC 60534-6-1 (NAMUR)
positioner mounting standard.

5

GX 3--Way Valve and Actuator

Flow Directions --- Side Port Common Constructions

See figures 5, 6, 7, and 8.

DIVERGING

BONNET

O-RING

LEFT PORT
(COMMON PORT)

W9580-1

VALVE PLUG

SEAT RING

BOTTOM PORT

Figure 5. Side Port Common Construction Details for Diverging Constructions

Product Bulletin

51.1:GX 3--Way
August 2011

RIGHT PORT

INLET

DIVERGING

PLUG DOWN (0% TRAVEL)

ALL FLOW PASSES

THROUGH FROM LEFT TO

RIGHT-HAND PORT

Figure 6. Fisher GX 3-Way Flow Directions for Side Port Common Diverging Constructions

PLUG MID TRAVEL (50% TRAVEL)

DIVERGING

INLET

FLOW IS DIVERTED EQUALLY

BETWEEN BOTTOM AND

RIGHT-HAND PORT

DIVERGING

PLUG UP (100% TRAVEL)

INLET

ALL FLOW PASSES

THROUGH FROM LEFT TO

BOTTOM PORT

6

Product Bulletin

51.1:GX 3--Way
August 2011

CONVERGING

LEFT PORT
(COMMON PORT)

BONNET

O-RING

VALVE PLUG

SEAT RING

GX 3--Way Valve and Actuator

RIGHT PORT

W9580-1

Figure 7. Side Port Common Construction Details for Converging Constructions

CONVERGING

PLUG DOWN (0% TRAVEL)

BOTTOM PORT FLOW IS SHUT-

OFF. ALL RIGHT-HAND FLOW

EXITS LEFT-HAND PORT

Figure 8. Fisher GX 3-Way Flow Directions for Side Port Common Converging Constructions

BOTTOM PORT

CONVERGING

PLUG MID TRAVEL (50% TRAVEL)

INLET INLET

INLET

FLOW IS MIXED EQUALLY FROM

BOTTOM AND RIGHT-HAND

PORTS

CONVERGING

PLUG UP (100% TRAVEL)

INLET

RIGHT-HAND FLOW IS SHUTOFF.
ALL BOTTOM PORT FLOW EXITS

THROUGH LEFT-HAND PORT

7

GX 3--Way Valve and Actuator

Flow Directions --- Bottom Port Common Constructions

See figures 9, 10, 11, and 12.

DIVERGING

BONNET

O-RING

LEFT PORT

LOWER
SEAT / CAGE

Product Bulletin

51.1:GX 3--Way
August 2011

VALVE PLUG

SEAL RING
BACKUP RING

RIGHT PORT

W9579-1

DIVERGING

PLUG DOWN (0% TRAVEL)

INLET

ALL FLOW EXITING

RIGHT-HAND PORT

Figure 10. Fisher GX 3-Way Flow Directions for Bottom Port Common Diverging Constructions

BOTTOM PORT (COMMON PORT)

Figure 9. Bottom Port Common Construction Details for Diverging Constructions

DIVERGING

PLUG MID TRAVEL (50% TRAVEL)

INLET

FLOW IS DIVERTED EQUALLY
BETWEEN BOTH SIDE PORTS

DIVERGING

PLUG UP (100% TRAVEL)

INLET

ALL FLOW IS EXITING THE

LEFT-HAND PORT

8