Emerson Fisher POSI-SEAL A31D Data Sheet

Product Bulletin

A31D Valve

D500213X012

September 2014

Fisherr POSI-SEALt A31D Double-Flange High-Performance Butterfly Valve

The Fisher A31D double-flange high-performance butterfly valve provides outstanding performance under extreme pressure and temperature conditions.

The A31D valve is available with face-to-face dimensions conforming to ISO 5752 Butterfly Valve Short (CL150) or Long (CL300) Series (for other face-to-face dimension requirements, consult your Emerson Process Management sales office). A splined shaft combines with a variety of Fisher spring-and-diaphragm or pneumatic piston actuators. A keyed drive shaft combines with a variety of handlevers, handwheels, or pneumatic double-acting or spring-return piston actuators. These combinations make the A31D valve a reliable, high-performance butterfly valve for both throttling and on-off applications in the process industries.

TheA31Dvalvecanbesuppliedwithoneofseveral dynamic seals (figure 1) that can be used in a variety of demanding applications. With the appropriate seal selection and materials of c onstruction, the pressure-assisted seal provides excellent shutoff against the full ASME class pressure range.

X0704

Fisher A31D Valve with 2052 Actuator

21.1:A31D

Features

 Excellent Shutoff Integrity-- The pressure-assisted

seal design provides tight shutoff and permits the use of smaller actuators in applications requiring full ASME B16.34 shutoff capabilities.

 True Bi-directional Shutoff Performance-- A31D

valve design helps to ensure that the torque necessary to open and close the valve is the same regardless of the direction in which the differential pressure is applied.

 Safety-- Shaft-blowout protection is designed into

the A31D valve (figure 2). For NPS 3 through 12 valves, the packing follower and an anti-blowout follower hold an anti-blowout gland securely around the valve shaft. Under the anti-blowout gland, a formed wire ring around the shaft completes the protection design. For NPS 14 through 24 valves, the anti-blowout gland fits securely over the valve shaft which has been turned down to form a circumferential shoulder that contacts the anti-blowout gland.

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Product Bulletin

21.1:A31D September 2014

A31D Valve

D500213X012

 Excellent Emissions Capabilities-- The optional

ENVIRO-SEAL™ packing system is designed with improved sealing, guiding, and loading force transmission. The ENVIRO-SEAL packing system can control emissions to below the EPA (Environmental Protection Agency) limit of 100 ppm (parts per million) for valves.

 Shaft Versatility-- This valve will meet your actuator

needs with a choice of splined or keyed shaft connections.

Table of Contents

Features 1.....................................

Specifications 3................................

Installation 4..................................

Standard Seal Configurations 4...................

 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.

 Reliable Flange Gasketing Surface-- Seal retainer

screws are located so there is no interference with the sealing function of either flat sheet or spiral woundlineflangegaskets.

 Easy Installation-- The valve body self-centers on the

line flange bolts as a fast, accurate means of centering the valve in the pipeline.

Tables Materials of Construction and Temperature Ranges 6 Valve Body Material Pressure/Temperature

Ratings 8...................................

Dimensions and Weights 10......................

Product Bulletin

A31D Valve

D500213X012

21.1:A31D

September 2014

A31D Valve Specifications and Materials of Construction

Table 1. Fisher A31D Valve Specifications

SPECIFICATION

Valve Body Size NPS 3, 4, 6, 8, 10, 12, 14, 16, 18, 20, and 24

Pressure Rating Consistent with CL150 and 300 perASME B16.34

Valve Body Materials

Disk Materials CF8M Stainless Steel

End Connections Mates with RF flangesper ASMEB16.5

Valve Body Style Double Flange

Shaft Connection

Face-to-Face Dimensions

Shutoff

Flow Direction Reverse (flow direction is into the shaft side of the disk)

Flow Characteristic Approximately Linear

Disk Rotation Clockwise (CW) to close

1, See table 4 and figure 4 for additional information. The pressure/temperature limits in this bulletin and any applicable codes or standard limitation should not be exceeded.

2. 0.1 scfhper unit of NPS at 80 psi.

CL150: ISO5752 ButterflyValve ShortSeries

CL300: ISO5752 ButterflyValve LongSeries

Soft Seal: Bidirectional ANSI/FCI 70-2 Class VI

NOVEX Seal: Unidirectional MSS SP-61

Phoenix III Seal: ANSI/FCI 70-2 Class VI

WCC Steel

CF8M Stainless Steel

Spline (standard)

Keyed (optional)

(1)

(2)

Product Bulletin

21.1:A31D September 2014

A31D Valve

D500213X012

Figure 1. Available Seal Configurations

BACK-UP RING

SEAL RING

RETAINING RING

E0578

Notes:

This unidirectional seal must be installed so that the retaining ring is downstream from the high pressure side of the valve at shutoff, as shown.

For this bidirectional seal, The “preferred” valve orientation places the retaining ring downstream from the high pressure side of the valve at shutoff.

BODY

VALVE DISC

SOFT SEAL WITH BACK-UP O-RING

RETAINING RING

LARGEST OUTSIDE DIAMETER

HIGH PRESSURE AT SHUTOFF

NOVEX SEAL

GRAPHITE GASKET

BODY

VALVE DISC

BACK-UP RING

BODY

VALVE DISC

PHOENIX III

FIRE-TESTED SEAL

LARGEST OUTSIDE DIAMETER

SEAL RING

HIGH PRESSURE AT SHUTOFF

LARGEST OUTSIDE DIAMETER

SEAL RING

RESILIENT INSERT HIGH PRESSURE AT SHUTOFF

Installation

Recommended or “preferred” installation for the A31D valve is with the flow into the shaft side of the disk (retaining ring downstream from the high pressure side of the valve).

The standard soft seal offers ANSI/FCI 70-2 Class VI, bidirectional shutoff. The Phoenix III seal should be installed in the preferred direction to obtain optimal shutoff performance, and it must be installed in the preferred direction for fire-tested applications. The NOVEX seal is uni-directional and should be installed in the preferred direction.

For assistance in selecting the appropriate combination of actuator action and open valve position, contact your Emerson Process Management sales office.

Standard Seal Configurations

 Standard Soft Seal (PTFE)-- A resilient dynamic seal

with an elastomeric back-up ring for low to moderate temperature applications.

 NOVEX Seal-- The NOVEX stainless steel seal is

available for severe service, Cryogenic, and high-temperature applications.

 Phoenix III Seal-- This three-component,

metal-and-polymeric seal is available for severe service with low to moderate temperature applications.

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