1. General Introduction
Fisher GX is a compact control valve and actuator system which designed to control a wide range of process liquids, gases, and vapors. It is rugged, reliable, and easy to select and requires no actuator sizing which the actuator selection is automatic once the valve body construction is selected. The optimized design results in reduced complexity and parts count and cost of maintenance is reduced. The GX meets the requirements of both EN and ASME standards. It is available with a complete accessory package, including the Fisher FIELDVUE DVC2000 and DVC6200 integrated digital valve controllers. It mainly come with typical features as below:
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 which has been optimized to eliminate complicated actuator sizing procedures. It means 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 ENVIRO-SEAL packing sets are common across several sizes as well.
Stable flow control: The flow cavity of the GX valve body has been engineered to provide stable flow and reduce process variability.
2. Specification of Fisher GX Valve
Specifications | EN Standard | ASME Standard |
Valve Body Size | DN 15, 20, 25, 40, 50, 80, 100, 150 | NPS 1/2, 3/4, 1, 1-1/2, 2, 3, 4, 6 |
Pressure Rating | PN 10 / 16 / 25 / 40 per EN 1092-1 | CL150 / 300 per ASME B16.34 |
End Connections | Flanged raised face per EN 1092-1 | Flanged raised face per ASME B16.5 |
Valve Body/Bonnet Materials | 1.0619 steel | ASME SA216 WCC steel |
1.4409 stainless steel | ASME SA351 CF3M stainless steel | |
CW2M (DN 25 to DN 100 only) | CW2M (NPS 1 to 4 only) | |
ASME SA352 LCC | ASME SA352 LCC | |
ASTM A990 CN3MCu/ASME SA351 CN7M (Cast Alloy 20) (DN 25 to DN 100 only) | ASTM A990 CN3MCu/ASME SA351 CN7M (Cast Alloy 20) (NPS 1 to 4 only) | |
CD3MN Duplex SST(DN 25 to DN 100 only) | CD3MN Duplex SST (NPS 1 to 4 only) | |
CF3 304L SST(DN 25 to DN 100 only) | CF3 304L SST (NPS 1 to 4 only) | |
M35-2 (NPS 1 to 4 only) | ||
N7M Alloy B2 (NPS 1 to 4 only) | ||
Face-to-Face Dimensions | Consistent with EN 558-1 Series 1 | Consistent with ANSI/ISA 75.08.01 |
Long Face-to-Face | Consistent with ANSI/ISA 75.08.07 | |
Shutoff per IEC 60534-4 and ANSI/FCI 70-2 | Metal seat - Class IV (standard) | |
Metal seat - Class V (optional) | ||
PTFE seat - Class VI (optional) | ||
Flow Direction | Flow-up (Cavitrol III trim, Flow down) | |
Flow Control Characteristics | Equal Percentage and Linear | |
Trim Style | Port Diameters | Trim Style Description |
4.8 mm | Micro-Flow trim (unbalanced) | |
9.5, 14, 22 mm | Stem-Guided with Contoured Plug (unbalanced) or Port-Guided with Cavitrol III trim (unbalanced) | |
36, 46 mm | Port-Guided Plug (unbalanced) | |
70, 90, 136 mm | Balanced Trim with Contoured plug or Unbalanced Port-Guided Plug | |
Hand wheel | Available as an option | |
Travel Stop | Available as an option |
3. Specification of Fisher GX Valve
Description | Pneumatic spring-return diaphragm actuator |
Operating Principle | Air-to-open (standard), Air-to-close (optional) |
Operating Pressure Ranges | 2.0 to 6.0barg (29 to 87 psig) |
Ambient Temperature | -46 to 82℃ (-50 to 180℉) |
Pressure Connection (Fail-up Construction) | G 1/4 female casing connection |
Finish | Powder coat polyester |
4. Typical work drawings for Fisher GX Valve
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