172-65174MA-11 (COSR Pressure Reducing Valve) 16 Feb 2022
15
External Secondary Pressure Sensing Line
For proper use of COSR with the external secondary pressure sensing line, follow the
installation procedure below.
1)
Loosen and remove the bolts (nuts) that attach the pilot body to the main body or
the pilot valve cover (65 to 150 mm (2
1
/
2
to 6 in)) and remove the pilot body.
2)
Install the provided blind pin by first removing the connecting tube from the main
body and then substituting the blind pin.
3)
Re-install the pilot body and fasten the bolts (nuts) evenly.
4)
Remove the plug Rc(PT)
3
/
8
(or NPT
3
/
8
) and connect the secondary pressure
sensing line with a slightly falling pitch.
The end of the external secondary pressure sensing line should be connected to the
place on the steam-using equipment where the pressure is to be sensed.
A shut-off valve should be installed in the external secondary pressure sensing line.
15 to 50 mm (
1
/
2
to 2 in)
65 to 150 mm (2
1
/
2
to 6 in)
Piping Example:
Body
Inlet
Outlet
Plug Rc(PT)
3
/
8
Hex Bolt (Nut)
Pilot Body
Connecting Tubes
Pilot Body
Replace the factory-installed connecting tube
(hollow tube) with the blind pin (solid plug).
Connecting Tube Blind Pin
Valve
COSR
10 mm (
3
/
8
in) Outlet
Pressure Sensing Line
(slightly falling pitch)
1m (3.3 ft) or 15d
15d or more
Steam-using Equipment
Whichever is
larger
