MODEL POSR-1
PILOT OPERATED PRESSURE RE DUC ING REGULATOR
SECTION I
I
. DESCRIPTION AND SCOPE
The POSR-1 is a pilot operated pressure reducing reg u la tor used to control downstream (P
2
) pressure. The
POSR-1-20 is a pressure loaded (no pilot) option. Sizes are 1/2", 3/4" and 1" (DN15, 20 and 25). The unit is suitable
for steam service only. Refer to Technical Bulletin POSR-1-TB for design conditions and selection recommendations.
NOT RECOMMENDED FOR DEAD END SERVICE!
SECTION II
II. INSTALLATION
A. General:
IOM-POSR-1
02-16
INSTALLATION, OPERATION & MAINTENANCE MANUAL (IOM)
B. Piping the Valve:
1. An inlet block valve should always be in stalled.
2. If service application is continuous such that
shut down is not readily accomplished, it is
recommended that an inlet block valve, outlet
block valve, and a manual bypass valve be
installed.
3. Pipe unions are recommended for NPT
screwed in stal la tions to allow removal from
piping.
4. An outlet pressure gauge should be lo cat ed
ap prox i mate ly ten pipe diameters down stream,
and within sight.
FIGURE 1
Recommended Piping Schematic for POSR-1
FIGURE 2
Recommended Piping Schematic for POSR-1-20
WARNING
Do not dead end (no flow demand) downstream of POSR-1
if P
1
- Inlet Pressure is greater than max i mum allowable
outlet design pressure.
Max.
Allowable
Spring
Range Out
let Pressure
5-15 psig (0.34-1.03 Barg)
100 psig (6.9 Barg)
10-40 psig (0.69-2.8 Barg)
200 psig (13.8 Barg)
30-80 psig (2.1-5.5 Barg)
200 psig (13.8 Barg)
70-150 psig (4.8-10.3 Barg)
200 psig (13.8 Barg)
CAUTION
Installation of adequate overpressure pro tec tion is
recommended to pro tect the reg u la tor from overpressure
and all down stream equip ment from damage in the event
of regulator failure.
PI
SRV
Pilot
Valve
Main
Valve
TR
HP Cond.
MP/LP Cond.
TR
PI
SRV
Airset or
Manual Loader
Air
Supply
TR
TR
HP Cond.
MP/LP Cond.
Main
Valve
ISO Registered Company
