Data Sheet

GX 3--Way Valve and Actuator
Product Bulletin
51.1:GX 3--Way
August 2011
14
The GX 3-Way Diaphragm Actuator
W8487-3/IL
Figure 16. Fisher GX 3 - Way Actuator
The GX 3-Wayusesamulti-spring, pneumatic
diaphragm actuator (see figure 16). It is capable of
air supply pressures up to 5.0 barg (72 psig),
allowing valve shutoff at high pressure drops (see
table 8).
The GX 3-Way product selection system
automatically matches the actuator to the valve,
eliminating the need for complex actuator sizing
procedures.
The multiple spring design provides the preload,
eliminating the need for bench set adjustment. The
actuator is available in fail-down and fail-up
configurations.
The GX 3-Wayactuatorcanbeusedforthrottlingor
on-off service.
The GX 3-Way is available with the integrated
DVC2000 digital valve controller. Other digital and
analog positioners are available, as well as optional
solenoids and limit switches.
Table 5. Actuator Specifications
Description
Pneumatic spring-return diaphragm actuator
Operating Principle
Fail-down (standard configuration)
Fail-up (optional configuration)
Operating Pressure Ranges See tables 8 and 9
Ambient Temperature
--46 to 82_C (--50 to 180_F)
Pressure Connection (Fail-Up Construction)
G 1/4 internal casing connection
Finish Powder coat polyester
Table 6. Materials of Construction
Part
Material
Upper and Lower Casings AISI 1010 stamped carbon steel
Springs Steel
Diaphragm NBR and nylon
Diaphragm Plate AISI 1010 stamped carbon steel
Yoke and Yoke Extension on HT Construction Carbon steel
Casing Fasteners
A2-70 stainless steel bolts and nuts
Actuator Rod Stainless steel
Stem Connector CF3M
Stem Connector Fasteners
SA193-B7 bolts with NCF2 coating
Stem Bushing
High-density polyethylene (HDPE)
Stem Seal NBR