I
MO-D52/R52
10
9/21 Rev. 0
Structure
Actuator without manual operation unit
In this actuator, the air-pressure signal from the controller or the air-pressure output from the positioner
is received by the diaphragm and the intended output and positioning are achieved in force balance
with the spring. This actuator consists mainly of the steel diaphragm case, diaphragm, multi-spring
(4 to 8 pieces) and the output shaft.
For each size of the actuator, two types are available. One is the direct action (the valve closes when
the air-pressure to the diaphragm chamber is increased), and the other is the reverse action (it opens
when the air-pressure to the diaphragm chamber is increased).
Fig. 8.
D52B and D52C
Structure of direct-action type and part names
Fig. 9.
R52B and R52C
Structure of reverse action type and part names
No. Name
101 Yoke
102 Diaphragm upper case
103 Diaphragm lower case
104 Diaphragm plate
105 Stopper
106 Actuator rod
107 Guide holder
108 Diaphragm
109 Spring
110 Spring seat
111 Center plate
112 Connector
113 Scale plate
115 Hanging ring
120 Dry bearing
121 Hexagon bolt
122 Hexagon nut
123 Hexagon bolt
124 Hexagon nut
125 Hexagon bolt
126 Spring washer
127 Seal washer
129 O-ring
130 O-ring
131 Hexagon socket head bolt
132 Hexagon socket set screw
133 Small cap screw
134 Speed nut
137 Indicator
138 Exhaust plug
140 Hexagon bolt
