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Type EZH Relief
ParT naME
Tool Size
Hex Head
Cap Screw
Torque
(key 6)
Tool Size
allen Head
Screw
Torque
(key 16)
Tool Size
Hex Head
Cap Screw
(keys 21 and
Torque
39)
Tool Size
Stud Bolts
(key 24)
Torque
Tool Size
Hex Head nut
(key 26)
Torque
Tool Size
allen Head
Screw
Torque
(key 33)
Tool Size
allen Screws
(keys 68 and
Torque
74)
Tool Size
Hex Head
Cap Screw
Torque
(key 77)
Disk Maintenance
NPS 4, 6, 8, 12 x 6 / DN 100, 150, 200, 300 x 150
(refer to Figure 4)
1. If present, remove travel indicator assembly by unscrewing
the travel indicator fitting (key 141), then pull out the stem
(key 139). Please see the Travel Indicator Maintenance
section for the proper maintenance procedure.
2. Remove cap screws (key 77).
3. Carefully lift the cap (key 70) off the upper actuator
casing (key 11) and unscrew an eye bolt (key 35) from
the cap (key 70).
4. Loosen captured screws (key 68) until free to spin.
5. Remove the O-ring (key 69). Inspect the O-ring for
damage or wear and replace if necessary. Lubricate
O-ring before placing inside the cap (key 70).
6. Loosen captured screws (key 68) until free to spin.
7. Fit eye bolt (key 35) into the upper spring seat (key 73)
threaded hole.
6
Table 3. Torque Specifications and Tool Recommendations
nPS 1 / Dn 25
13/16 in. or 21 mm
Ft-lbs
50 to 60
N•m
68 to 81
4 mm
Ft-lbs
4.2 to 5.8
N•m
5.6 to 7.9
19 mm
Ft-lbs
50 to 55
N•m
68 to 75
3/4 in.
Ft-lbs
50 to 70
N•m
68 to 95
3/4 in. or 19 mm
Ft-lbs
45 to 50
N•m
61 to 68
3 mm
Ft-lbs
2.5 to 3.3
N•m
3.4 to 4.5
Ft-lbs
N•m
Ft-lbs
N•m
BODy SiZE
nPS 2 / Dn 50
NPS 3 / DN 80
3/4 in. or 19 mm
15/16 in. or 24 mm
50 to 60
70 to 95
68 to 81
95 to 129
5 mm
5 mm
4.2 to 5.8
4.2 to 5.8
5.6 to 7.9
5.6 to 7.9
24 mm
32 mm
130 to 150
250 to 270
176 to 203
339 to 366
3/4 in.
1-1/8 in.
50 to 70
100 to 120
68 to 95
136 to 163
3/4 in. or 19 mm
1-1/4 in. or 32 mm
45 to 50
80 to 95
61 to 68
108 to 129
4 mm
5 mm
4.2 to 5
6.7 to 8.3
5.6 to 6.8
9 to 11
- - - -
- - - -
8. Carefully remove the sleeve assembly from the sleeve
guide (key 61) using the eye bolt (key 35).
The sleeve assembly may be oriented
upside down for ease of maintenance, but
care should be taken not to drop small
components into the sleeve assembly.
9. Remove socket head cap screws (key 33) and lock
washers (key 32).
10. Lift off the disk retainer (key 31) and disk holder assembly
(key 30).
11. Remove the O-ring (key 29). Inspect the O-ring for
damage or wear, replace if necessary. Lightly lubricate
O-ring before placing the sleeve adaptor (key 27).
12. Place disk holder assembly (key 30) onto disk
retainer (key 31).
13. Place disk retainer (key 31) with the disk holder
assembly (key 30) into sleeve adaptor (key 27) and align
screw holes.
nPS 6, 8 and 12 x 16 /
nPS 4 / Dn 100
Dn 150, 200 and
300 x 150
1-1/8 in. or 29 mm
19 mm Allen
140 to 155
374 to 414
190 to 210
507 to 561
6 mm
6 mm
8.3 to 9.6
17.7 to 19.8
11 to 13
24 to 27
41 mm
41 mm
280 to 310
483 to 497
380 to 420
655 to 675
- - - -
- - - -
221 to 244
299 to 331
30 mm
- - - -
140 to 160
190 to 220
5 mm
5 mm
6.7 to 8.3
6.7 to 8.3
9 to 11
9 to 11
4 mm
4 mm
3
3
4
4
20 mm
30 mm
90 to 110
221 to 244
122 to 149
299 to 331
note
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