Corken 91 - Page 75

Appendix E—Parts Details for 491 and F491 Head and Valve Assembly
Head and Valve Bill of Materials
Ref
No.
Part No. Description Qty.
1. 3712
a
Head (model 491, ductile iron) 1
2. 4297
Head
(model F491, Class 300 RF flange)
1
3. 2-253_
a, b, c
O-ring (model 491) 2
4. 3442 Pipe plug (1/4" NPT) 3
5. 1479
b
Center head bolt 2
6.
7005-043NC125A
b
Bolt (ferry head, 7/16"-14 x
1-1/4", 490 and 491 prior to serial
#FZ44188)
12
7005-043NC150A
b
Bolt (ferry head, 7/16"-14 x 1-1/2",
491 serial # FZ44188 and later)
12
7. 1477 Valve screw nut 4
8. 1478 Gasket (steel) 4
9. 1476 Valve holddown screw 4
10. 1475 Valve cover plate 4
11. 2-143_
c
O-ring for cover plate 4
12. 1409
d
Valve spacer 4
13. 2448 Cage 4
14. 1418 Valve gasket (aluminum) 4
15. 2446 Bolt 2 or 4
16. 2438 Suction valve seat 2
17. 2442 Valve plate 4
18. 2445
d
Spacer (two per valve) 8
19. 3355 Washer 4
20. 1407 Valve spring 4
21. 2440 Suction valve bumper (spec 4) 2
22. 2441 Discharge valve bumper 2
23. 2439 Discharge valve seat 2
24. 2533-1 Adjusting screw 2
25. 1411 Relief ball spring 2
26. 1410 Relief ball 2
27. 2532-1 Suction valve seat 2
28. 2534-1 Suction valve post 2
29. 2447 Suction valve bumper (spec 3) 2
30. 7001-043NC125A Bolt (hex head, 7/16"-14 x 1-1/4") 16
Ref
No.
Valve Assembly No. Assembly Name
101. 2438-X Suction valve assembly—spec 4
102. 2439-X Discharge valve assembly—all specs
103. 2532-1X Suction valve assembly—spec 3
Head Assembly No. Model Valve Specification
3712-X1
a
491 3
3712-X2
a
491 4
4297-X1 F491 (Class 300 RF) 3
4297-X 2 F491 (Class 300 RF) 4
a
S/N FZ44188 and later.
b
Not included in head assembly.
c
_ denotes material code. See material code chart for
details.
d
Place spacers back to back as shown.
e
Registered trademark of the DuPont company.
Material Code
A Buna-N
B Neoprene
®e
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