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Fisher A31A Instruction Manuals

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Instruction Manual
Form 5291
March 1998
Introduction
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Scope of Manual
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Description
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Specifications Table
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Maintenance
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Phoenix III Fire-Tested Seals
FireTested Seal Installation
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Parts Ordering
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Parts Reference
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Scope of Manual
This instruction manual includes installation, mainte-
nance, and parts ordering information for Size 14-
through 24-inch, POSI-SEAL Model A31A High-Per-
formance Butterfly Valve (see figure 1). Refer to sep-
1
1
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3
4
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6
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W5811-1/IL
W5812-1/IL
Figure 1. Typical Model A31A Valves
arate instruction manuals for information covering the
actuator and accessories.
Only personnel qualified through training or experience
should install, operate, and maintain this control valve.
If you have any questions concerning these instruc-
tions, contact your Fisher Controls sales representa-
tive or sales office before proceeding.
Description
The valve is available in either a flangeless wafer body
or a single-flange (lugged) body design, with a variety
of seals and internal components. The pressure-as-
sisted seal provides tight shutoff against the full ANSI
class pressure range for the specific type. The keyed
shaft combines with a variety of handlevers, hand
wheels, pneumatic piston or spring-and-diaphragm
actuators. Maximum inlet pressure/temperature rat-
ings are consistent with ANSI Class 150 and 300.
Model A31A

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Summary of Contents for Fisher A31A

  • Page 1: Table Of Contents

    ....... NOVEX , Phoenix III and/or Phoenix III Fire-Tested Seals Figure 1. Typical Model A31A Valves FireTested Seal Installation ....
  • Page 2 , wafer-style (flangeless) or single- Noise Levels flange (lugged) with raised-face flanges, ANSI Class 150 or 300 See Fisher Controls Catalogs 10 or 12 for sound/ pressure level prediction Maximum Pressure Drop Valve In-Line Position Consistent with ANSI Class 150 and 300 -pressure- temperature ratings per ASME B16.34-1996 unless...
  • Page 3 Model A31A B2335–2/IL Figure 2. Maximum Pressure-Temperature Ratings...

  • Page 4: Form

    Cryogenic Seal Ring or sales office 1. NACE trim constructions are available; consult your Fisher Controls sales office or sales representative. 2. PEEK stands for poly-ether-ether-ketone. 3. For a complete material description, contact your Fisher Controls sales office or sales representative.

  • Page 5: Valve Orientation

    Use lock-out procedures to be sure that the above If the Model A31A valve is equipped with a fail-open actuator, cycle the valve into measures stay in effect while you are work on the the fully closed position.
  • Page 6 Model A31A Table 3. Valve Body Data, Class 150 Table 4. Valve Body Data, Wafer-Style Valves, Class 300 SHAFT FACE-TO- SHAFT FACE-TO- MINI- APPROX. MINI- APPROX. DIA. FACE DIA. FACE WEIGHT, WEIGHT, VALVE VALVE AT YOKE DIMEN- AT YOKE DIMENSI .(2)

  • Page 7: Adjusting The Actuator Travel Stops Or Travel

    Key number locations are shown in figure 9, unless The maximum allowable inlet pressures for Model otherwise noted. A31A valves are consistent with the applicable ANSI pressure/temperature ratings except where limited by 1. Refer to the actuator instruction manual to locate...

  • Page 8: Packing Adjustment And Shaft Bonding

    ANSI B16.5 standard or user’s The valve drive shaft is not necessarily standard, can be used on Model A31A valves depend- grounded to the pipeline when installed. ing on the service conditions of the application.

  • Page 9: Removing And Replacing The Actuator

    Figure 6. Optional Shaft-to-Valve Body Bonding Strap Assembly Packing Maintenance Valve parts are subject to normal wear and must be The Fisher Controls Model A31A control valve is de- inspected and replaced as necessary. The frequency signed so the packing can be replaced without remov- of inspection and replacement depends upon the se- ing the valve from the process pipeline.
  • Page 10 Model A31A C0758-1/IL Figure 7. Anti-Blowout Design Details 1. Before loosening any parts on the valve, release CAUTION the pressure from the pipeline. Then, remove the hex nuts (key 15) and lift off the packing follower (key 11). Be careful when cleaning the packing box.

  • Page 11: Removing The Valve

    Bolts Bolts Nore: These values are based upon standard materials, S66286/Inconel screws and ASTM A193GRB6 bolts. For other special fasterer materials, please contact your Fisher Controls sales office or sales representative. 3. Loosen the flange bolting that holds the valve.

  • Page 12: Ptfe Seals

    A maintenance kit with installation tools is available To install a new seal, O-ring (key 6), and retaining ring through your Fisher Controls sales office or sales rep- gasket, follow the appropriate instructions given below. resentative. 1. Locate the replacement seal ring (key 5) and note PTFE Seals the shape of the ring.

  • Page 13: Anti-Blowout Design, Packing, Valve Shaft

    Note screws by pushing the screws through the graphite gasket and threading them into the valve body. The A31A valve has a two-piece shaft. In these procedures, the shaft (with the splined end) is called the upper shaft 5. Tighten the retaining ring socket head cap screws (key 3).
  • Page 14 Model A31A 1. Remove the valve from the pipeline. Remove the tend several inches above the disk when it is screwed into a pin. actuator from the valve. d. After screwing the rod into the pin, slide the spacer over the rod and pin. Thread a nut onto the CAUTION rod and tighten it.

  • Page 15: Installing The Two-Piece Shaft

    Model A31A 11. Inspect the valve body bore, bearings, bearing 5. Insert the drive shaft into the valve body through bores, and packing box for damage. the packing box. Push the drive shaft throught the bearing. Hold the drive shaft drive bearing (key 24) in...

  • Page 16: Gasket Retainer

    TANGENTIAL PIN OR DISK PIN representative or sales office about a Model A31A RETAINING RING GASKET, GRAPHITE valve, please identify the valve as a Model A31A and NAMEPLATE (NOT SHOWN) provide the valve serial number. For valve/actuator DRIVE SCREW (NOT SHOWN)
  • Page 17 Model A31A B2388/IL Figure 9. Model A31A Wafer Style Valve Assembly...
  • Page 18 Model A31A ENVIRO-SEAL, POSI-SEAL, NOVEX, Phoenix III, Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rose- mount Systems, Inc.All other marks are the property of their respective owners. Fisher Controls International, Inc. 1991, 1998; All Rights Reserved...

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