Pressure Controllers
38 customer.honeywell.com 70-6925
PP901; PP902 Pressure Reducing Valves
Used to control the pressure of the air delivered to pneumatic
control systems. Models available for single-pressure systems or
two-pressure systems (Day/Night or Summer/Winter) requiring
two independently regulated pressure settings. Dual-pressure
units switch from the lower settings to the higher settings when
main air is applied to the pilot port. Models also available
including a sub-micron filter assembly and pressure gauges.
Replacement devices are available for Johnson, Powers,
Robertshaw, Barber-Colman and older Honeywell pressure
reducing valves.
• Built-in adjustable safety relief valve for limiting downstream
pressure.
• For two-pressure models: Pressure changes accomplished with
manual switch or automatically with electric pneumatic switch.
• Adjustable stops for desired settings.
Dimensions in inches (millimeters)
PP902D Typical Operation
Dimensions in inches (millimeters)
PP902C Typical Operation
1- 1/ 2
(38)
1/4 NPT
OUTLET
1/4 NPT
INLET
C5146
GAGE
CONNECTION
1/8 NPT
SWITCHOVER
INLET PORT
(PP901B ONLY)
2-1/4
(57)
3-1/4 (83)
4-7/8
(124)
IN
2
3
1
EX
FROM
COMPRESSOR
FILTER
OUT
PRV
REDUCED
PRESSURE
TO SYSTEM
C5544
TO AUTOMATIC OR
MANUAL SWITCHOVER
CONTROL
EP RELAY
5-3/8
(135)
C5325
8-5/8
(219)
3-7/8
(100)
9-5/8
(244)
5-3/4
(146)
15
20
25
30
0
5
10
psig
80
100
120
160
0
20
40
psig
140
60
IN
FROM
COMPRESSOR
FILTER
REDUCED
PRESSURE
TO SYSTEM
C5543
PRV
OUT
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