I
MO-D52/R52
15
9/21 Rev. 0
Disassembly
Please follow below instructions when disassembling this actuator.
Separating the valve and actuator
Follow the procedure indicated below.
•
Follow the instructions given below for separating, ensure not to damage the valve seat
surface.
• For the direct-action type, reduce the air-pressure within the diaphragm chamber to zero
(valve-open state).
• For the reverse action type, apply air-pressure to the diaphragm chamber and keep the
valve 10 to 40% open.
•
Loosen the hex socket head bolt 131, which fastens the connector 112 shown in Fig. 12, to
remove the indicator 137. The state is to be as shown in Fig. 13.
•
Apply a rectangle-tipped chisel to the
concave section of the yoke nut 17 and hit it
with a hammer to loosen the nut as shown
in Fig. 14.
•
When the hex socket set screw 132 in
Fig. 14 is loosened, the actuator can be
separated from the valve unit.
When installed on a Hammel Dahl control valve,
the stem 5 will include a stem adapter as shown
in Fig. 12A. When valve maintenance is
required, remove the stem adapter 5A and hex
jam nut 5B.
•
Lower the hex jam nut, separating it from
the stem adapter.
Unthread the stem adapter and then the jam
nut, removing both from the valve stem 5.
Fig. 12.
Fig. 12A.
Fig. 13.
Fig. 14.
