1st Stage Suction
(Specification 6P—Reverse Unloader)
1st Stage Suction
(Specification 4P—Standard)
1st Stage Discharge
(All Specifications)
1
2
3
4
5
6
Spring down
7
8
9
10
11
10
12
13
14
15
16
17
18
19
20
21
22
24
14
15
16
17
23
18
19
22
23
23
25
19
24
14
16
18
15
Spring down
Spring up
Appendix E—1st Stage Valve Assembly Details for Model WFD551
Ref
No.
Part No.
Description
Qty.
1.
7002-025TP125A
Socket head 1/4"-20 x 1-1/4"
3
2.
5275
Unloader body cap (spec 6P)
1
3.
5277
Unloader spring (spec 6P)
1
4.
7002-025NC037A Socket head 1/4"-20 x 3/8"
1
5.
5272
Unloader piston cap
1
6.
5279-X
Piston seal assembly
1
7.
5276
Unloader piston (spec 6P)
1
8.
5000-87SS
Retainer ring
1
9.
5280
Unloader washer
1
10.
5278-X
Piston seal assembly
2
11.
5345
Unloader body (spec 6P)
1
12.
5281
Unloader washer
1
13.
5000-150SS
Retainer ring
1
14.
2-031_
a
O-ring
2
15.
7001-043NC125A Hex head 7/16-14 x 1-1/4"
8
16.
2715
Valve hold-down screw
2
17.
1763
Cover plate
1
18.
2-151_
a
O-ring
2
19.
2797
Valve cage
2
20.
4032
Unloader actuator (spec 6P)
1
21.
5284
Actuator spring (spec 6P)
1
22.
3856-3X2
Suction valve assembly
1
23.
2114-2
Valve gasket (iron-lead standard)
2
2114-1
Valve gasket (copper optional)
2
2114
Valve gasket (aluminum optional)
2
24.
2714-1
Valve cap (spec 4P and discharge)
2
25.
3857-2X2
Discharge valve assembly
1
Head and Valve Assembly Bill of Materials
WARNING
Always relieve pressure in the unit before attempting
any repairs.
28