172-65175MA-13 (COS Pressure Reducing Valve) 16 Feb 2022
20
Disassembling the Separator and Main Valve Section
Turn the COS upside down for easy dismantling of the separator and main valve.
Loosen the hex bolts and remove the trap body. Be careful, as the separator may
drop off when the COS is returned to the normal attitude.
Removal of the separator and pressed-in sleeve permits removal of the main valve
coil spring, the main valve, main valve holder and screen. Loosen the valve seat with
a box wrench and remove it from the body.
Check for damage on the seating and sliding surfaces of the main valve and main
valve holder, the seating surface of the valve seat, the gaskets, and for clogging of
the screen.
At start-up following shut-down for a long period, always blow down the piston
section of the body through the plug (option).
15 to 50 mm (
1
/
2
to 2 in)
65 to 100 mm (2
1
/
2
to 4 in)
Body
Main Valve Seat &
Gasket
Main Valve
Main Valve Holder
Main Valve Spring
Separator
Sleeve
Separator Screen
Trap Body
Hex Bolt
Corrugated Spring Washer
Gasket
Body
Main Valve Seat &
Gasket
Main Valve
Main Valve Holder
Main Valve Spring
Separator
Sleeve
Separator Screen
Trap Body
Hex Bolt
Corrugated Spring Washer
Hex Bolt
Gasket
