Remove all steam from the piping (both upstream and downstream). If the steam supply to the
system cannot be shut off, change over to bypass operation. Close shutoff valves at the inlet
and outlet of the COS/COSR completely. Relieve residual steam pressure by loosening
slightly the spring housing bolt and pilot screen holder or sensing line plug. Wait for the body
to cool before attempting to remove the COS/COSR from the line. Then remove inlet and
outlet flange retaining bolts and trap discharge pipe union connection (COS) to permit removal
of the COS/COSR for disassembly and inspection. Secure the COS/COSR in a vise to
perform the inspection.
Loosen the adjustment screw completely and remove the bolts. Having removed the spring
housing, you will see the diaphragm support, coil spring, spring retainer and ball.
6.2 Disassembling the Adjustment Section
6.1 Before Disassembly
The diaphragm is removed by utilizing the notch in the pilot body. Loosen and remove the pilot
valve seat with a box wrench. Pick up the pilot valve and the pilot valve spring with a pair of
tweezers. Loosen the pilot screen holder to remove the pilot screen.
6.3 Disassembling the Pilot Section
Check for seizure or any damaged screw threads.
15 - 150 mm ( " - 6")
2
1
/
Diaphragm
Support
Coil Spring
Spring Retainer
Ball
Bolt
Locknut
Adjustment Screw
Spring
Housing
Nameplate
Spanner Cap
• Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
• Be sure to use the proper components and NEVER attempt to modify the
product.
CAUTION
English
16
To Next Page
Loading...
Need help?
General
