172-65604MA-00 (
PN-COSR
Pneumatic Control Valve) 10 Sep 2014
18
Disassembly
Use hoisting equipment for heavy objects (weighing approximately
20 kg (44 lb) or more). Failure to do so may result in back strain or other
injury if the object should fall.
CAUTION
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
It is a recommended practice to dismantle and inspect the
PN-COSR-16
once a year
for preventive maintenance purposes. It is especially important to perform an
inspection immediately after the initial run of a new line or before or after equipment
such as a heater is out of service for a long period of time. (Installation, inspection,
maintenance, repairs, disassembly, adjustment and valve opening/closing should be
carried out only by trained maintenance personnel.)
Remove all steam from the piping (both upstream and downstream). Stop supplying
motive air to the
PN-COSR-16
. Remove the spanner cap, and then pull up the
adjustment screw until there is no load on the coil spring. Wait for the body to cool
before attempting to remove the
PN-COSR-16
from the line as it may be heated with
the residual heat of steam. Then remove the inlet and outlet flange retaining bolts and
nuts to permit removal of the
PN-COSR-16
. Secure the
PN-COSR-16
in a vise to
perform the inspection.
Disassembling the Adjustment Section (Drive Section)
Make sure that the position of the adjustment screw is such that no load is applied to
the coil spring.
Remove the hex bolts and then take off the spring housing. Remove the C-ring with
an appropriate tool to remove the adjustment screw. Remove the adjustment screw by
loosening it. Then remove the packing retainer by turning it counterclockwise.
Spanner Cap
Adjustment Screw
Spring Housing
Steel Ball
Hex Bolt
O-ring
Packing Retainer
Gland Packing
C-ring
Spring Retainer
Coil Spring
Diaphragm Support
NOTE: Make sure that there are no scratches or wear on the internal parts. Do not reuse the
O-ring and the gland packing.
