I
MO-D52/R52
9
9/21 Rev. 0
Changing air-pressure by the spring range, check that the rod moves as
specified. When a positioner is attached, follow the instructions in the
previous section (1) for adjustment and checking.
(b)
Reverse action actuator (the valve opens when the instrument air-
pressure is increased.)
Apply the air-pressure, which is the minimum value of the spring range.
Lower the valve body stem so that the plug contacts the valve seat.
Engage the connector with the threaded portion of the actuator rod 106
and that of the valve stem and fix them firmly with the hex socket set
screws. If they do not engage well with each other, slightly increase the
air-pressure from the minimum value of the spring range and engage them
again.
Changing air-pressure by the spring range, check that the rod moves as
specified. When a positioner is attached, follow the instructions in the
previous section (1) for adjustment and checking.
Operation
Manual operation: This unit is an optional accessory used to open/close the valve unit
when the air-pressure for operation is not available.
When manual operation is finished, be sure to return the handle shaft to its specified position
(within the distance between a point about 1 mm away from the edge of the elongate hole on
the MO cover and the edge as shown in Fig. 5 and 6). If it is not returned to the specified
position, rod stroke will be insufficient during automatic operation.
If excessive force is applied when the handle is moved past the specified position, the manual
override may be damaged.
•
When the crank handle 205 is turned clockwise, the valve stem 5 moves toward the
valve-closed position. When it is turned counter-clockwise, the valve stem moves toward
the valve-open position.
•
For operating the valve in the automatic operation mode, be sure to return the handle to the
specified position as shown in Fig. 5 and 6.
Fig. 5. Direct action (DA) type Fig.6. Reverse action (RA) type
Fig.7. Stem adapter
