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Instruction Manual

D500242X012

A31A Cryogenic-Rotary Valve

February 2019

9

D

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

Figure 3. Properly Installed Cryogenic Valve

16B5084 / DOC

COLD BOX

TRANSITION

4” ‐ 8” MIN

20

_

MIN

Replacing Packing

The A31A Cryogenic valve is designed so the packing can be replaced without removing the valve from the process
pipeline, provided there is no internal pressure. Packing may be PTFE V‐rings or graphite.

Key numbers for the parts in this section may be found in figures 7 and 8.

CAUTION

Tighten the packing flange only enough to prevent shaft leakage. Excessive tightening will only accelerate wear of the
packing and could produce higher torques on the valve than expected.

Usually, packing leakage can be eliminated by merely tightening the hex nuts (key 15) located above the packing
flange while the valve is in the pipeline. However, if leakage continues, replace the packing.

CAUTION

Never use a wrench or pliers on the valve shaft. A damaged shaft could cut the packing and allow leakage.

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Содержание Fisher POSI-SEAL A31A

Страница 1: ...W7451 IL Introduction Scope of Manual This instruction manual provides installation maintenance and parts ordering information for the POSI SEAL A31A Cryogenic high performance butterfly valves see figure 1 The Series C 3 through 6 inch Class 150 300 and 8 inch Class 150 feature a cast one piece extension The 8 inch Class 300 and 10 through 24 inch Class 150 300 designs have a two piece extension ...

Страница 2: ...ure limits in this manual and any applicable code or standard limitation should not be exceeded Description The A31A Cryogenic Series C 3 through 6 inch Class 150 300 and 8 inch Class 150 High Performance Butterfly Valve features either a double D drive shaft to allow direct coupling to the 1035 actuator or keyed shaft optional The A31A Cryogenic is a reliable high performance butterfly valve for ...

Страница 3: ...re pressure drop temperature and controlled fluid conditions Because pressure drop and temperature range capabilities limit some combinations of materials do not apply any other conditions to the valves without first contacting your Emerson sales office Before installation check the maximum allowable inlet pressures for A31A Cryogenic valves shown in figure 2 and the Specifications table Figure 2 ...

Страница 4: ...on Note When the process flow is gas install the valve with the shaft in the horizontal position When the process flow is liquid the valve should be installed at an incline above horizontal of at least 20 degrees as shown in figure 3 Inclined installation can enhance valve performance by preventing direct cryogenic liquid contact with the packing The A31A Cryogenic valve is designed for installati...

Страница 5: ...ANSI class Minimum inside diameters for flanges or pipe mating with valves are shown in tables 2 and 3 Be certain to align the valve accurately to avoid contact between the disk and the flanges Improper alignment or insufficient space for disk rotation could result in damage to the disk Additionally be certain that the valve body and any adjacent pipelines are free of foreign material such as pipe...

Страница 6: ... 2 1 4 5 7 8 15 3 8 570 956 20 2 3 4 6 1 4 17 13 32 884 1282 24 2 3 4 7 1 8 20 19 32 1128 1903 1 Face to face dimensions are in compliance with MSS SP68 and API 609 specifications 2 Minimum I D is the minimum pipe or flange I D required for disk swing clearance 3 Select the appropriate gaskets for the application Flat sheet spiral wound or other gasket types made to ANSI B16 5 group or user s stan...

Страница 7: ... 18 32 48 1 1 8 8 1 1 4 8 3 1 4 4 20 40 48 1 1 8 8 1 1 4 8 3 1 2 4 24 40 48 1 1 4 8 1 1 2 8 3 1 2 4 1 2 1 Thread engagement in accordance with ANSI B31 3 Chemical Plant and Petroleum Refinery Piping 2 Properly orient the valve according to the specific application For optimum performance install the valve so that the shaft will be on the high pressure side of the valve at shutoff reverse flow Inst...

Страница 8: ...in to allow for gasket compression Note The optional graphite ribbon packing and metal bearings are composed of all conductive material to electrically bond the shaft to the valve for hazardous area service as opposed to the non conductive PTFE packing and bearings Maintenance Valve parts are subject to normal wear and must be inspected and replaced as necessary The frequency of inspection and rep...

Страница 9: ...e is no internal pressure Packing may be PTFE V rings or graphite Key numbers for the parts in this section may be found in figures 7 and 8 CAUTION Tighten the packing flange only enough to prevent shaft leakage Excessive tightening will only accelerate wear of the packing and could produce higher torques on the valve than expected Usually packing leakage can be eliminated by merely tightening the...

Страница 10: ...ratches to the shaft or inside diameter of packing bore might cause leakage 5 Before installing new packing clean the packing box 6 Install new packing key 13 one ring at a time using the packing follower key 11 as a driver If using split ring packing stagger the splits in the rings to avoid creating a leak path 7 Reinstall all parts Tighten the packing follower nuts key 18 as needed to stop leaka...

Страница 11: ... retaining ring by placing a socket head retaining ring screw from the retaining ring in each of the two retaining ring jacking screw holes Slowly turn the screws until the retaining ring has been lifted from the valve body Remove the retaining ring to expose the seal ring in the T slot area of the valve body Note The A31A Cryogenic valve is available with different seal designs and components See...

Страница 12: ...s is available through your Emerson sales office 1 Locate the replacement seal ring key 7 and note the shape of the ring The ring is wider across one edge diameter and narrower across the other edge diameter Also note the wide groove around the outside circumference Before installing the seal ring into the valve body place the backup ring if applicable key 8 into the wide outer groove of the seal ...

Страница 13: ...el stop to protect the disk With a rubber mallet tap the disk until it contacts the internal travel stop When the disk makes contact with the stop manually rotate the disk counterclockwise back out of the seal ring to a 90 degree open position 9 The final seating of the retaining ring screws can now be done For the screw torque values refer to table 5 10 Repeat steps 8 and 9 two more times Note Wh...

Страница 14: ...16 72 53 53 39 1 2 112 83 80 59 9 16 161 119 117 86 5 8 225 166 161 119 3 4 401 296 286 210 7 8 651 480 447 330 1 976 720 651 480 1 1 8 1356 1000 837 617 Note These values are based upon standard materials S66286 Inconel screws and ASTM A193GRB6 bolts For other special fastener materials please contact your Emerson sales office 2 Install the seal ring and if applicable back up ring in the valve bo...

Страница 15: ...ing to a 90 degree open position 9 The final seating of the retaining ring screws can now be done For the screw torque values refer to table 5 10 Repeat steps 7 and 8 two more times Note When attaching the actuator to the valve make sure the valve disk is not in contact with the internal travel stop The valve disk should be positioned from 0 03 to 0 76 mm 0 001 to 0 030 inch away from the internal...

Страница 16: ...he actuator from the valve do not use a hammer or similar tool to drive the lever off the valve shaft Driving the lever or actuator off the valve shaft could damage the valve internal parts If necessary use a wheel puller to remove the lever or actuator from the valve shaft It is okay to tap the wheel puller screw lightly to loosen the lever or actuator but hitting the screw with excessive force c...

Страница 17: ... the drive shaft 1 disk pin in the follower shaft D Class 300 12 inch size Two piece shaft with 2 tangential pins in the drive shaft 1 disk pin in the follower shaft D Class 150 and 300 14 through 24 inch sizes Two piece shaft with 2 tangential pins in the drive shaft 1 disk pin in the follower shaft 5 Proceed as appropriate using the following instructions For valves with taper key s locate the t...

Страница 18: ... of the valve body 9 After removing the shaft s remove the disk and the thrust bearings key 28 Do not force the disk past the seal ring or T slot area 10 Remove the journal bearings key 9 Using a suitable punch or puller drive or pull the journal bearing s into the valve body bore from the drive shaft bearing bore Do not attempt to remove the bearing stop Remove the journal bearing from the follow...

Страница 19: ...ollows Valve Size Inches Minimum Depth to Drive Taper key After Initial Solid Contact mm Inches ANSI Class 150 and 300 size 3 4 6 inch valves and 8 inch ANSI Class 150 valves 5 0 188 b The disk shaft and taper key assembly must be inspected to verify that the taper key spans the entire shaft flat width If so this procedure is complete If not the taper key must be driven in farther until this condi...

Страница 20: ...er the valve body over the disk using caution not to dislodge or damage the thrust bearings placed on the ends of the shafts 9 With the valve disk properly positioned in the valve body push the drive shaft and follower shaft the rest of the way through the thrust bearings and into the shaft bores in the valve disk 10 Align the holes in the shafts with the holes in the disk CAUTION To avoid damage ...

Страница 21: ...he Gasket Retainer Valves with a two piece shaft use a gasket retainer and gasket to cover the follower shaft opening in the valve body 1 Replace the gasket key 15 and gasket retainer key 14 over the end of the follower shaft Use a new gasket 2 Replace the four hex head bolts key 21 and lockwashers key 20 to hold the gasket retainer in place 3 Be sure to center the gasket over the follower shaft b...

Страница 22: ...act your Emerson sales office Key Description 1 Valve Body If you need a valve body as a replacement part order by valve size serial number and desired material Contact your Emerson sales office for assistance 2 Retaining Ring 3 Disk 4 Shaft 5 Follower Shaft 8 inch size Class 300 only 6 Taper Key 7 Seal Ring 8 Backup Ring 9 Bearing Journal 2 req d 4 req d for 8 inch Class 300 10 Bearing Outboard 1...

Страница 23: ...Instruction Manual D500242X012 A31A Cryogenic Rotary Valve February 2019 23 Figure 7 Fisher A31A Cryogenic 3 through 12 inch Typical Assembly 16B5086 DOC ...

Страница 24: ...Instruction Manual D500242X012 A31A Cryogenic Rotary Valve February 2019 24 Figure 7 Fisher A31A Cryogenic 3 through 12 inch Typical Assembly continued 16B5085 DOC 16B5087 DOC ASSEMBLY ...

Страница 25: ...00242X012 A31A Cryogenic Rotary Valve February 2019 25 Figure 8 14 through 24 Inch Fisher A31A Cryogenic Valves Wafer Style Shown Shown without 2 piece Extension Housing B2388 IL ANTI BLOWOUT FLANGE ANTI BLOWOUT FLANGE NUT ...

Страница 26: ...Instruction Manual D500242X012 A31A Cryogenic Rotary Valve February 2019 26 ...

Страница 27: ...Instruction Manual D500242X012 A31A Cryogenic Rotary Valve February 2019 27 ...

Страница 28: ...h are available upon request We reserve the right to modify or improve the designs or specifications of such products at any time without notice E 1999 2019 Fisher Controls International LLC All rights reserved POSI SEAL NOVEX and Fisher are marks owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co Emerson Automation Solutions Emerson and the Emer...

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