Maintenance, Stroking range, Instruction manual – Emerson Process Management 1051 User Manual
Page 15: Warning
Instruction Manual
D100320X012
1051 and 1052 H & J Actuators
October 2012
15
Table 11. Recommended Bolting Torques
(1)
KEY NUMBER
ACTUATOR SIZE
40
60
70
NDm
lbfDft
NDm
lbfDft
NDm
lbfDft
6
27
20
27
20
27
20
7 & 8
41
30
41
30
102
75
9
34
25
102
75
102
75
16
34
25
61
45
102
75
18
81
60
163
120
271
200
21
23
17
68
50
68
50
23
34
25
81
60
81
60
28
81
60
163
120
271
200
34
34
25
81
60
81
60
40
9
7
9
7
9
7
54 handwheel
34
25
34
25
34
25
54 down stop
27
20
66
49
69
51
58
102
75
163
120
163
120
141
41
30
41
30
81
60
1. Exceeding any torque requirements could damage the actuator and impair safe operation.
Stroking Range
The initial spring set listed on the nameplate has been determined to be the optimum setting, and it is not
recommended to make spring adjustments that will cause this value to change or be exceeded. For
push-down-to-open (PDTO) action, the initial spring set is normally the maximum allowable to provide the maximum
spring closing force. Any increase of this setting could over-stress the spring at full travel. For push-down-to-close
(PDTC) action, the initial spring set has been determined to be the optimum balance between the air to close and the
spring to open breakout torque.
If the 1052 actuator is to be changed from one action to another (i.e., from PDTC to PDTO), first refer to the initial
spring compression values listed in the table for keys 11 and 13 in the Parts List section. Then adjust the unit according
to the procedures in the Initial Compression portion of this section.
Maintenance
Actuator parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of
inspection and replacement depends upon the severity of service conditions. Instructions are given below for
disassembly and assembly of parts. Key numbers referenced in the following steps are shown in figure 12 for 1051
actuators and in figure 13 for 1052 actuators unless otherwise specified.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or uncontrolled movement of parts.
Before performing any maintenance operations:
D
Do not remove the actuator from the valve while the valve is still pressurized.
D
Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D
Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.