172-65587MA-02 (CV-COSR Pneumatic Control Valve) 3 Jun 2019
15
Disassembly/Reassembly
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble. (Installation, inspection, maintenance, repairs, disassembly,
adjustment and valve opening/closing should be carried out only by trained
maintenance personnel.)
NOTE: Be sure to coat all threaded portions of the valve seat and bolts with anti-seize.
Perform the following procedure before beginning disassembly:
1. After connecting the air piping, operate the air pressure reducing valve to maintain
the positioner air supply pressure at 0.38 MPaG (54 psig).
2. Connect a current generator or a controller for input of an operation signal of 4 to
20 mA.
Removing/Reattaching the Stem Bracket Plates
Part
During Disassembly
During Reassembly
—
Set the actuator air supply
pressure to 0 MPaG (0 psig)
to maintain the valve in the
fully closed position.
Set the actuator air supply
pressure to 0 MPaG (0 psig) to
maintain the valve in the fully
closed position.
Check to make sure the valve
stem and actuator stem are in
firm contact with each other.
Bolts and
Nuts
Remove with a socket wrench
Consult the table of tightening
torques and tighten to the
proper torque
Stem
Bracket
Plate
Take the bracket apart
(separates into 2 plates)
After aligning the plates, tighten
the nuts and bolts while making
sure the gap between the
plates is even on both sides
CAUTION
Be careful not to pinch your fingers between the
valve stem and actuator stem!
Disassembling/Reassembling the Valve and Actuator Sections
Part
During Disassembly
During Reassembly
The actuator unit
orientation can be
changed.
—
Set the operation signal input
to 12 mA (50%)
Make sure the gap between
the valve stem and the
actuator stem is open
Set the operation signal input
to 12 mA (50%)
Make sure the gap between
the valve stem and the
actuator stem is open
Valve
Bonnet Nut
Remove with an open-end
wrench
Consult the table of tightening
torques and tighten to the
proper torque
CAUTION
Be careful not to pinch your fingers between the
valve stem and actuator stem!
