Fisher A31A High‑Performance Butterfly Valve | CL150 CL300 NPS3‑24

 

The Fisher A31A POSI-SEAL is a metal-seated high-performance butterfly valve for industrial pipeline isolation and shut-off service. Size range NPS 3-24 with CL150 and CL300 pressure classes. Keyed shaft structure supports multiple actuator options, delivers tight shut-off under diverse process operating conditions.

 

 

This valve targets on‑off and isolation duties across process facilities. Two body configurations：wafer‑style and single‑flange (lugged), fit standard ASME B16.5 raised‑face flanges. Multiple seal options and cryogenic service variants support project‑specific configuration.

 

• NPS 3‑12：compact layout, compatible with smaller actuators. Cryogenic service available.
• NPS 14‑24：reinforced valve body for large‑diameter high‑flow process lines.

 

 

 

Sealing Performance Pressure‑assisted dynamic seal structure achieves bubble‑tight shut‑off.

 

1. Phoenix III seal：fire‑safe certified, bi‑directional bubble‑tight shut‑off.
2. NOVEX metal seal：uni‑directional tight shut‑off, installation orientation shall follow high‑pressure side requirement.
3. Standard soft‑seal：bi‑directional bubble‑tight shut‑off.

 

Shaft & Body Safety Structure Keyed drive shaft transmits torque between disc and actuator. Anti‑blowout shaft design prevents shaft ejection under pipeline pressure fluctuation. Interchangeable internal components simplify field maintenance and spare‑part replacement.

 

Low Fugitive Emission Option ENVIRO‑SEAL live‑loaded packing assembly is an optional upgrade. It restricts fugitive emission below 100 ppm for sites with strict emission regulationsEmerson.

 

Field Installation Compatibility Valve body self‑centers against flange bolts during mounting. Seal retainer screw layout avoids interference with flat gaskets or spiral‑wound flange gaskets. No modification required for standard mating flanges.

 

 

Fisher A31A supports manual and automated operating assemblies:

 

• Manual：handlever, handwheel / gear operator
• Pneumatic：piston actuators, diaphragm actuators
• Digital control：Fisher DVC6200 digital valve positioner (stainless‑steel variant optional)

 

When paired with DVC6200, the valve provides real‑time feedback, on‑board diagnostics and precise modulation for process loops.

 

Standard rotation direction: clockwise‑to‑close for NPS3‑12; large‑size NPS14‑24 can be customized.

 

 

• Oil and gas processing
• Chemical and petrochemical plants
• Power generation facilities
• Water treatment and utility networks
• Pharmaceutical and general process industries

 

 

Item	Specification
Valve Body	One‑piece body;wafer‑style / single‑flange(lugged);two‑component seal plus backup O‑ring;keyed drive shaft
Size Range	NPS 3‑24Cryogenic service: NPS 3‑24
Flange Standard	ASME B16.5 CL150 / CL300
Pressure‑Temperature Rating	ASME B16.34 CL150, CL300
Disc Surface	Hard‑coated for NOVEX / Phoenix III seal versions
Shaft Extension	Extended shaft available for cryogenic service (0‑304.8 mm / 0‑12 in)
Shut‑off Performance	Standard Soft Seal: Bi‑directional bubble‑tightNOVEX Seal: Uni‑directional (follow installation orientation requirement)Phoenix III Seal: Bi‑directional bubble‑tight, fire‑tested
Supported Actuators	Handlever, handwheel‑gear, pneumatic piston / diaphragm actuators
Rotation Direction	NPS3‑12: clockwise to close;NPS14‑24 configurable
Compliance Standards	MSS SP68, API 609, ANSI/FCI 70‑2, IEC 60534, API 607

 

Note：Body style, pressure rating, seal type and actuator fit vary per valve size and configuration. Refer to official datasheet or consult our engineering team for exact project parameters.

 

 

• Global project supply for industrial valve packages
• Multiple shipping options: sea freight, air freight, express delivery
• Engineering service: model selection review, configuration check, installation guidance
• Document supply: datasheets, 2D/3D drawings for project approval and commissioning

 

Warranty terms subject to sales contract.

 

 

Q1: What body types are available for Fisher A31A butterfly valve?

Wafer‑style and single‑flange (lugged) body options. Select based on pipeline connection requirements.

 

Q2: What standards does A31A comply with?

Mainly API 609, MSS SP68, ASME B16.5 and ASME B16.34. Fire‑safe version meets API 607.

 

Q3: What information is required for quotation?

Provide valve size, pressure class, body style, seal material, actuator & positioner requirements. We confirm complete model number accordingly.

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