2
1
3
4
6
a
2
1
3
5
6
a
Appendix D—Valve Holddown Assembly Details (HG600/THG600 Series)
a
Included with valve assembly.
b
_ denotes material code. See material code chart for details.
c
Prior to serial number FN (January 1, 1984), use valve cap #2714 and gasket #2716.
d
Quantity = 2 if equipped with unloaders.
e
H
2
O cylinder requires cage #4311.
f
Registered trademark of the DuPont company.
7
d
8
d
9
2
1
3
10
4
6
a
7
d
8
d
9
2
1
3
10
5
6
a
Valve Holddown Assembly (2 .75" only)
Valve Holddown Assembly
(3 .25", 4", 5", 6", & 8" only)
Ref .
No .
Description
Cylinder Diameter
2 .75"
3 .25"
4"
Part No .
Qty . per
Cylinder
Part No .
Qty . per
Cylinder
Part No .
Qty . per
Cylinder
1.
Hex head bolt
7001-050NC150A
12
7001-043NC150A
16
7001-043NC150A
16
2.
Valve cover plate
3894
4
2205
4
1764
4
3.
O-ring
2-224_
b
4
2-143_
b
4
2-235_
b
4
4.
Suction valve assembly
3900-X (steel)
2
4029-X2 (steel)
2
3807-X (steel)
2
5.
Discharge valve assembly
3901-X (steel)
2
4030-X2 (steel)
2
3808-X (steel)
2
6.
Valve gasket
3896
a
4
1418-2
a
(steel)
4
2114-2
a
(steel)
4
7.
Valve cap
N/A
—
2714-1
d
4
2714-1
d
4
8.
O-ring
N/A
—
2-031_
b
4
2-031_
b
4
9.
Holddown screw
N/A
—
2715
4
2715
4
10.
Valve cage
N/A
—
3569
4
3809
4
11.
Actuator
N/A
—
3689
2
3956
2
12.
Unloader spring
N/A
—
3690
2
3695
2
13.
Unloader cap
N/A
—
2598-1
2
2598-1
2
14.
Unloader assembly
N/A
—
3689-X1
2
3956-X
2
15.
Bolt
N/A
—
1910
2
1910
2
16.
Bal-seal
N/A
—
2619-X
4
2619-X
4
17.
Unloader piston cap
N/A
—
2857
2
2857
2
18.
Gasket
N/A
—
2858
2
2858
2
19.
Unloader piston
N/A
—
4205
2
3957
2
Suction
Suction
Discharge
Discharge
WARNING
CAUTION: Always relieve pressure in the
unit before attempting any repairs.
54
