Fisher A11 Butterfly Valve – Rotary Valves

Fisher A11 Valve is a high performance butterfly valve with a single-flange design featuring a keyed or square-end shaft for various on/off applications.

A square or keyed shaft can combine with a variety of handlevers, handwheels, or pneumatic piston diaphragm actuators. The Fisher A11 valve can be supplied with one of several dynamic seals that can be used in a variety of demanding applications

Fisher A11 is available in NPS 3 through 24, CL600 (both keyed and square-end shafts), and NPS 30 through 48, CL150/150, CL150 and CL300

Fisher A11 Valve Butterfly Valve – Product Features

• Shaft Versatility – this valve will meet your actuator needs with a choice of square, keyed, or splined shaft connections
• Excellent Shutoff Integrity – the pressure-assisted seal design provides tight shutoff and permits the use of smaller, less expensive actuators in applications requiring full ASME B16.34 shutoff capabilities
• Excellent Emissions Capabilities – optional ENVIRO-SEAL™ packing systems are designed with very smooth shaft surfaces and live-loading to provide improved sealing, guiding, and loading force transmission. The seal of the ENVIRO-SEAL system can control emissions to below 100 ppm (parts per million)
• Sour Service Capability – Trim and bolting materials are available for applications involving sour liquids and gases. These constructions comply with NACE MR0175-2002, MR0103, and MR0175 / ISO 15156
• High-Temperature/Cryogenic Capabilities– Optional valve constructions allow this valve to meet both high-temperature and cryogenic applications (see table 7 for cryogenic and high-temperature actuator configurations)
• Easy Installation – the valve body self-centers on the line flange bolts as a fast, accurate means of centering the valve in the pipeline
• Reliable Flange Gasketing Surface – seal retainer screws are located so there is no interference with the sealing function of either flat sheet or spiral wound line flange gaskets
• True Bidirectional Shutoff Performance – a feature of the valve design is that the torque necessary to open and close the valve is the same regardless of the direction in which the differential pressure is applied
• Ease of Maintenance – interchangeability of all parts, including shafts and discs, simplifies service and reduces maintenance costs

FISHER A11 VALVE BUTTERFLY VALVE

PRODUCT Specification

Available Valve Configurations	 Flangeless (wafer) or  Single-flange (lugged)
End Connection Style	Flangeless or single flange style designed to fit between raised-face mating flanges of appropriate class pressure rating ASME B16.5 NPS 3 through 24: CL600 NPS 6 through 24: CL900 NPS 10 through 20: CL1500 ASME B16.47 Class A and MSS-SP-44 NPS 30 through 48: CL150, 300, and 600 NPS 30 through 36: CL900
Maximum Inlet Pressure/Temperature	Consistent with CL150, 300, 600, 900, and 1500 pressure/temperature ratings per ASME B16.34
Standard Construction Materials	Disk Hard Surfacing: All CL600, 900, and 1500 disk edges must be coated, regardless of the seal type. Metal, NOVEX, Phoenix III and cryogenic seals require the disk to be coated, regardless of the valve class
Shutoff Classification per ANSI/FCI 70-2 and IEC 60534-4	Standard Soft Seal: Bubble-tight shutoff (exceeds Class VI) Metal Seal: 20% of Class IV (reverse direction only) NOVEX Seal: Standard Class V (Class VI optional, reverse direction only) Phoenix III Seal: Bubble-tight (reverse direction only), Class VI (forward direction only) High Pressure Seal: Standard Class V (Class VI optional, reverse direction only) Cryogenic Seal (Reverse direction only): NOVEX: Class VI CTFE: 10% of Class IV CTFE with Aluminum Backup Ring: Class VI
Flow Characteristic	Modified equal percentage
Available Actuators	Handlever; handwheel; or pneumatic piston, spring return, double-acting, spring and diaphragm
Disk Rotation	Clockwise (CW) to close

FISHER A11 VALVE BUTTERFLY VALVE DIMENSIONS & WEIGHTS

Valve Size NPS	A		B	C	D	E	F	H	J	K	L	M(1)	Key Sq Size	Approximate Weight
	Wafer	Single Flange
mm														kg
NPS 30	864	994	121	559	516	295	95.25	337	See diagram below	76.2	See diagram below	744	12.7	528
NPS 36	1029	1178	149	683	613	295	95.25	337		76.2		888	12.7	806
NPS 42	1207	1356	210	762	695	314	114.3	337		76.2		1032	15.9	1302
NPS 48	1364	1524	229	889	826	314	114.3	305		152		1180	15.9	1904

See how Fisher Control Valves provide safe, efficient and intuitive flow control.

Installing Fisher A11 Butterfly Valve

Fisher A11 butterfly valves should be installed in reverse flow direction. Reverse flow direction is into the side of the valve body opposite the retaining ring or into the shaft side of the disk

➡ Did you know? Fisher was founded  in 1880 by William Fisher. Today Fisher valves are used throughout oil and gas, petrochemical, refining, power and paper industries – the company is now a subsidiary of the Emerson process industrial group. 

Data Sheets

• Fisher A11 Valve Butterfly Valve – Rotary Valves – Data Sheet
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