Emerson 91 Installation And Maintenance Instructions Manual Download Page 6

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ANDERSON GREENWOOD

TYPE 91 AND 94 TYPE OPERATED SAFETY RELIEF VALVES

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Type 91

View A - A

Item

Description

100

Body

110

Nozzle

130

Boost spacer

140

Sense spacer

150

Sense plate

160

Boost plate

200

Bonnet assembly

210

Upper diaphragm case

220

Lower diaphragm case

230

Spacer ring

350

Blowdown adjustment needle

400

Filter screen

420

Seat - retainer

430

Ring - retainer

500

Spindle diaphragm

510

Diaphragm - sense

550

Spindle

560

Check plate

570

Seat

580 *

Bonnet gasket

590 *

Boost tube seal

610 *

Body bolt seal

620 *

Blowdown seal

630 *

Bushing seal

640 *

Gasket case

660 *

Spindle seal

690 *

Spindle diaphragm gasket

[1]

760

Cap

790

Pressure adjustment screw

800

Body vent

810

Bonnet vent

840

Spring

NOTES

Recommended spare parts for repairs

1. Only used if item 500 is PTFE
Refer to Section 8 for soft goods repair kits.

FIGURE 4

Exhaust

Summary of Contents for 91

Page 1: ...o protect head eyes ears etc anytime you are near pressurized valves Never attempt to remove the pressure relief valve from a system that is pressurized Never make adjustments to or perform maintenance on the pressure relief valve while in service unless the valve is isolated from the system pressure If not properly isolated from the system pressure the pressure relief valve may inadvertently open...

Page 2: ...ly tube Nameplate External blowdown adjustment Main valve typical in order to isolate them when maintenance is required When putting the safety valve in service be sure the block valve is fully opened If the block valve is opened after system start up the safety valve may briefly vent before the dome gets pressurized It will then close off positively 2 2 Repair Clean all metal parts and replace se...

Page 3: ...edge 2 370 Ring spacer 2 380 Spring 2 400 Dipper tube 410 Plug pipe not shown 420 Guide bolt FIGURE 2 NOTES Recommended spare parts for repairs 1 Used 15 psig except in 2 x 3 2 Used 6 valve and 1 psig 3 Not shown used on 4 Refer to Section 8 for soft goods repair kits Drag ring assembly Used in 6 150 mm cap may be tilted causing the bellows and seat plate to tip and the seat to leak Some lubricant...

Page 4: ...ubricate all screw threads and end of spring adjusting screw that bears against spring washer Use Dow Corning No 33 Silicone grease or equivalent When assembling pilot the following should be observed 3 2 1 The holes in spindle diaphragm must be aligned with all holes in the body The small hole in lower case must be aligned with hole in the body Two of the six case bolts for the medium pressure pi...

Page 5: ... 430 Ring retainer Type 94 only 500 Diaphragm needle 510 Diaphragm sense boost FIGURE 3 Type 91 PTFE seat Type 94 Elastomer seat View A A Low pressure pilot Exhaust NOTES Recommended spare parts for repairs 1 Only used if item 500 is PTFE Refer to Section 8 for soft goods repair kits 550 Spindle 560 Check plate 570 Seat 580 Bonnet gasket 590 Boost tube seal 610 Body bolt seal 620 Blowdown seal 630...

Page 6: ...wdown adjustment needle 400 Filter screen 420 Seat retainer 430 Ring retainer 500 Spindle diaphragm 510 Diaphragm sense 550 Spindle 560 Check plate 570 Seat 580 Bonnet gasket 590 Boost tube seal 610 Body bolt seal 620 Blowdown seal 630 Bushing seal 640 Gasket case 660 Spindle seal 690 Spindle diaphragm gasket 1 760 Cap 790 Pressure adjustment screw 800 Body vent 810 Bonnet vent 840 Spring NOTES Re...

Page 7: ...er diaphragm case 230 Spacer ring 350 Blowdown adjustment needle 400 Filter screen 500 Spindle diaphragm 550 Spindle 560 Check plate 570 Seat 580 Bonnet gasket 610 Body bolt seal 620 Blowdown seal 630 Bushing seal 640 Gasket case 660 Spindle seal 690 Spindle diaphragm gasket 1 760 Cap 790 Pressure adjustment screw 800 Body vent 810 Bonnet vent 840 Spring NOTES Recommended spare parts for repairs 1...

Page 8: ... 3 92 90 Modulating 7 WC to 1 0 psig 1 74 kpag to 6 89 kpag 3 90 100 0 2 Above 1 0 psig to 15 psig Above 6 89 kpag to 103 kpag 3 92 100 0 2 Above 15 psig to 50 psig Above 103 kpag to 345 kpag 3 92 100 0 2 7 WC to 1 0 psig 1 74 kpag to 6 89 kpag 3 90 100 0 2 Above 1 0 psig to 14 7 psig Above 6 89kpag to 101 kpag 3 92 100 0 2 Marine service Pilot action 1 Set pressure Set pressure tolerance Minimum ...

Page 9: ...ure is defined as the supply pressure were gas flow begins at the pilot exhaust FIGURE 6 1 5 mm Pipe 1 5 mm FNPT ports Accumulator Adjustable pressure regulator relieving type Supply pressure gauge Pressure adjustment Blowdown adjustment Dome pressure gauge Pilot valve to be set Pressure adjustment Blowdown adjustment Dome pressure gauge Vent Supply pressure Supply Supply port Optional bench set u...

Page 10: ... Each auxiliary pilot setting is adjusted and set at the factory to the required set pressure but is not installed on the valve Each device is to be installed per the customer s requirements see paragraph 5 2 1 Installation and Removal in the field The combined valve set pressure with auxiliary pilot setting devices installed will be the value stamped on the top most device There should be no adju...

Page 11: ...olution to all joints and seals Tighten bolts or fittings as required 7 PILOT SET PRESSURE FIELD TEST PROCEDURE 7 1 General The pilot set pressure can be checked in the field by applying an external test pressure to the pilot through the field test hand valve as shown in Figure 9 NOTE If the process pressure at the time of test is less than approximately 30 of the pilot set pressure the main valve...

Page 12: ...s NBR 010 011 012 FKM 013 014 015 EPR 016 017 018 NBR 6 019 020 896 FKM 6 021 022 897 EPR 6 023 024 898 Bolt SST 342 342 343 6 PTFE diaphragms BACKFLOW PREVENTER CHECK VALVE Kit Type Type material All pressures Soft goods Diaphragm PTFE 781 Ball NBR 344 FKM 345 EPR 346 Kalrez 782 Bolt Diaphragm SST 335 ANGMC 6025 EN 2014 2021 Emerson Electric Co All rights reserved 06 21 Anderson Greenwood is a ma...

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Emerson 91, Installation And Maintenance Instructions Manual

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