Parts, Tools And Supplies; Safety Valve Proper - Emerson CROSBY STYLE JQ Installation And Maintenance Instructions Manual

CROSBY STYLE JQ 4 IN. PRESSURE RELIEF VALVE
INSTALLATION AND MAINTENANCE INSTRUCTIONS

6 PARTS, TOOLS AND SUPPLIES

The safety valve is manufactured by Emerson
consists of Safety Valve Proper and Breaking
Pin Assembly.Tables 6.1.A and 6.1.B indicate
standard materials of construction. Alternate
materials may be available; contact Emerson.

6.1 Safety Valve Proper

Refer to Table 6.1.A for the safety valve proper.
All parts are interchangeable within a shop
assembly number regardless of the year
of manufacture.
6.1.1 The Cap (1) and Upper Diaphragm (2)
The Cap (1) seals the Upper Diaphragm (2) to the
Casing (8). The Upper Diaphragm (2) protects
the upper portion of the valve from external
contamination. The data plate is attached to the
Casing (8). Be sure to use the data plate with the
correct set pressure and shop number (3.3).
6.1.2 Spring (5)
There are two different springs. Be sure to
assemble the valve with the correct Spring (5).
Refer to Emerson Spring Selector
Procedure SS-5703.
Crosby Standard Corrosion Resistant Coating
Spring is the standard spring for the 300 psig
valve (stamped X00367).
Yellow Spring is the standard spring for the
375 psig valve (stamped 704).
6.1.3 Disc Bushing (10A) and Disc (10B)
The Disc Bushing (10A) and Disc (10B) are
furnished as a subassembly. To change out the
metallic seat valve for elastomeric seat design,
refer to Section 12.2.
6.1.4 Spiral Pin (10C)
A Spiral Pin (10C) is used only in the elastomeric
seat valve.
6.1.5 Collar (10D)
A Collar (10D) is used in the elastomeric
seat valve.
6.1.6 Nozzle (13)
The Nozzle (13) used in the metallic seat valve
is designed for use with a Nozzle Gasket (14).
The Nozzle Gasket (14) in early versions of the
Style JQ 4 in. 300 valve was antimony lead. The
current gasket material is compressed asbestos
(Fed Spec HH-P46E). The Nozzle (13) used in the
elastomeric seat valve is designed for use with
the O-ring (10E) (Size 5-046, Viton
Viton is a mark owned by E.I. du Pont de Nemours and Co.
®
Monel is a mark owned by Special Metals Corporation.
®
TABLE 6.1 PARTS FOR STYLE JQ 4 IN. VALVE
Description
Breaking Pin Setting (PSI)
Spring Setting of Valve (PSI)
Seat Design
Crosby JQ Valve Drawings
TABLE 6.1.A SAFETY VALVE PROPER
Shop Assembly No. (Emerson)
Item Description
1 Cap
2 Upper diaphragm
3 Adjusting bolt
4 Lock nut
5 Spring
6A Spindle
6B Spindle ball
7 Disc guide
8 Casing
9 Top spring washer
10A Disc
10B Bushing
10C Spiral pin
10D Collar
10E O-ring
11 Adjusting ring
12 Lock pin
13 Nozzle
Nozzle O-ring,
14
Nozzle Gasket
15 Base gasket
16 Safety mech. Gasket
17 Base
18 Lockscrew (2 required)
19 Bottom spring washer
20 Nameplate
21 Locking strip
22 Seal and wire
TABLE 6.1.B BREAKING PIN ASSEMBLY
Shop Assembly No. (Emerson)
Item Description
Yoke (assembly
30
with 32 and 35)
31 Breaking pin alternate 1
31 Breaking pin alternate 2
32 Plunger with columns
33 Spanner nut
Breaking pin clip
34
(2 required)
Housing (assembly
A material).
®
35
with 30 and 32)
36 Follower
37 Lower diaphragm
38 Vacuum grill
300
300
Metallic
H-38572-F
Ref. No. Material
6.1.1 Ductile iron
6.1.1 3% Antimony lead
- - - - Monel -cast
®
- - - - Monel -cast
®
Carbon steel
6.1.2
(CAD, plated)
- - - - Steel
- - - - SST
- - - - Cast steel
6 in. Seamless steel
- - - -
pipe, schedule 40
- - - - Steel (CAD, plated)
K-Monel
®
6.1.3
(Bushing - KR steel)
6.1.3 SST-440C
6.1.4 SST
6.1.5 Monel
®
- - - - Viton
®
- - - - Monel
®
- - - - Monel
®
6.1.6 K-monel
Viton , asbestos
®
6.1.6
(HH-46PE)
- - - - 3% Antimony lead
- - - - 3 % Antimony lead
- - - - Cast steel
- - - - Alloy steel
- - - - Steel
- - - - Sheet brass
- - - - SST
6.1.1 Lead-SST
Ref. No. Material
6.2.1 Steel bar
6.2.2 ARMCO iron rod
American brass-
6.2.2
bronze, no. 286*
- - - - Steel
- - - - Monel
®
- - - - Piano wire
- - - - Cast steel
- - - - Monel
®
- - - - 3 % Antimony lead
- - - - Monel
®
375 300
360 300
Elastomeric
H-38572-F H-86008
36788 42169 86006
Part No.
63690 63690 63690
63691 63691 63691
63692 63692 63692
63693 63693 63693
X00367C 71561 X00367C
SA38579 SA38579 SA38579
17944 17944 17944
63695 63695 63695
63696 63696 63696
63697 63697 63697
SA38588 SA38588 SA49877
36333 36333 36333
- - - - - - - - 75745
- - - - - - - - 82554
- - - - - - - - 75746
63699 63699 63699
66807 66807 66807
63701 63701 82566
68754 68754 80482
63703 63703 63703
63704 63704 63704
63705 63705 63705
63706 63706 63706
63707 63707 63707
67130 71531 67130
74926 74926 74926
73906 73906 73906
67131 71563 67131
Part No.
67367 67367 67367
67132 71562 67132
84808 102227 84808
67368 67368 67368
67369 67369 67369
67370 67370 67370
67371 67371 67371
67372 67372 67372
67133 67133 67133
67373 67373 67373
375
360
H-86008
86007
63690
63691
63692
63693
71561
SA38579
17944
63695
63696
63697
SA49877
36333
75745
82554
75746
63699
66807
82566
80482
63703
63704
63705
63706
63707
71531
74926
73906
71563
67367
71562
102227
67368
67369
67370
67371
67372
67133
67373
5