3
ANDERSON GREENWOOD
TYPE 91 AND 94 PILOT OPERATED SAFETY RELIEF VALVES
INSTALLATION AND MAINTENANCE INSTRUCTIONS
2.3 Assembly
Assemble in reverse order of disassembly.
If the nozzle was removed from the body,
cross torque socket head nozzle cap screws to
45/55 in·lb (5.1/6.2 Nm).
The bellows shield must be installed on
the bellows before the seat plate assembly
is attached. A seal is used under the head
of the guide bolt and between the seat plate
and guide tube. On 6” (150 mm) and larger
valves, a lockwasher is used under the locknut.
Place the bellows assembly in the valve body.
The top of the bellows and bellows shield,
where used, must locate in the counterbore
of the body. Locate the cap gasket on the
bellows top plate and place the cap with
guide tower in place. The cap gasket should
be positioned in the counterbore. If not, the
Item
Description
100
Body
110
Screw
140
Retainer seat
150
Retainer seat disc
160
Plate - seat
170
Bellows
180
Bellows shield
[1]
210
Cap
310
Flange - guide tower
320
Guide - bellows
340
Guide - tower
350
Ring - taper
[2]
360
Ring - wedge
[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 placed on the gasket will help keep it
in place. Install the cap bolts and cross torque
to 55/65 ft·lb (6.21/7.35 Nm). Install drag ring
assembly around bellows guide in guide tower
in sequence shown in Figure 2. The wedge and
taper rings
must be fully seated
in the bottom
of the tower. When properly assembled, these
rings will be below the top of the bellows guide.
Install the spring and spacer in the tower. Apply
a light coat of lubricant to the hex bushing and
install in the guide tower. It will be necessary to
compress the spring to install the bushing.
460
Nozzle
490
Bolt
500
Bushing - hex
510
Nut
520
Nut
540
Screw
550
Washer
560 *
Guide tower seal
570 *
Secondary seat
590 *
Bellows guide seal
610 *
Primary seat
620 *
Cap gasket
630 *
Nozzle gasket
640 *
Guide bolt seal
650
Bolt seal
700
Cap bolt - hex
710
Cap bolt - eye
[3]
750
Tubing
760
Nipple
Item
Description
