172-65604MA-00 (
PN-COSR
Pneumatic Control Valve) 10 Sep 2014
20
Disassembling the Main Valve / Cover Section
Turn the
PN-COSR-16
upside down for easy dismantling of the main valve. Loosen
the cover plug (15 – 25 mm ((
1
/
2
– 1 in)) or cover bolts (40, 50 mm (1
1
/
2
, 2 in)).
Removal of the cover plug (15 – 25 mm ((
1
/
2
– 1 in)) or the cover (40, 50 mm (1
1
/
2
, 2
in)) permits removal of the main valve, main valve holder and main valve spring.
Loosen the main valve seat with a socket wrench and remove it from the main body.
Check for damage on the seating surfaces of the main valve and main valve seat,
gaskets, and sliding surfaces of each part.
15 – 25 mm (
1
/
2
– 1 in)
Main Body
Main Valve Seat & Gasket
Main Valve
Main Valve Holder
Main Valve Spring
Cover Plug
Cover Plug
Gasket
40, 50 mm (1
1
/
2
, 2 in)
Cover
Main Body
Main Valve Seat & Gasket
Main Valve
Main Valve Holder
Main Valve Spring
Cover Bolt
Cover Gasket
Cleaning
After inspection and removal of any abnormality, clean and reassemble the parts. The
following parts will require cleaning before reassembly:
Cover Plug/Cover
Piston
Main Valve Seat
Piston Ring
Main Valve
Cylinder
Main Valve Holder
Pilot Valve
Pilot Screen
Pilot Valve Seat
It is permissible to clean using water, however cleaning with a mild detergent is
recommended for more effective cleaning.
(Coat threaded position with anti-seize after cleaning.)
