Technical Instructions
Document No. 155-049P25
RV 201-1
Rev. 1, May, 2000
Powers™ Controls
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RV 201 Pressure
Reducing Valves
Dual Pressure PRV
Single Pressure PRV
Description
The RV 201 Pressure Reducing Valve (PRV) is a diaphragm operated self-relieving
regulator valve that provides precision control of air supply pressures for pneumatic
control systems. A single compact assembly provides a single or dual pressure
regulating valve, a safety relief, and a pilot port for gauge indication. The PRV can
mount in any position and is adaptable to wall mounting (bracket provided) or a pipe
supported installation. The dual pressure PRV is piloted to regulate the reduced
pressure at either of two selected control pressure values.
Features
• Integral safety relief valve
• 2-1/2 inch (64 mm) gauge with 0 to 30 psig (0 to 207 kPa)
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• 200 mesh stainless strainer
• Locking handle
Product Numbers
• 201-1001 Single-stage, compressed air pressure reducing valve
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• 201-1002 Dual-stage, compressed air pressure reducing valve
Siemens Building Technologies, Inc.
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Application
Powers Controls™ RV 201 Pressure Reducing Valves
The primary function of the RV 201 PRV is to regulate the control air pressure for a
pneumatic control system. Although the primary supply pressure may vary from 60 to
125 psig (413 to 861 kPa) depending on the compressor size and operating
differentials, the reduced pressure must be precisely regulated to maintain consistent
control operation and calibration.
VP0136R1
CLEAN DRY AIR
150 PSI (1033 kPa) MAX
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The single air pressure regulator is appropriate for any pneumatic system requiring a
consistent regulated source of control air for system components. Single pressure
regulators are normally adjusted to maintain the controlled air pressure at the highest
acceptable value to ensure the highest possible system capacity, and to compensate
for any line losses in the control air piping (Figure 1).
IN
OUT
REGULATED
AIR SUPPLY
ADJUSTABLE
UP TO A MAX.
OF 35 PSI (240 kPa)
RV 201
SINGLE PRESSURE
REGULATOR
Figure 1. Single Air Pressure Regulator Application.
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The dual air pressure regulator provides either of two selected control air pressures.
This step changes to a different control air pressure implements mode or system
changes to pneumatic instruments and other mechanical system components in any
number of locations. The regulator maintains a source of control air supply for all
instruments at either of the selected control pressures. Individual dual pressure
systems can be applied to separate zones or areas to achieve a greater degree of
centralized control (Figure 2). Figure 3 shows a typical dual pressure system with
recommended pressure settings.
TWO POSITIION
PNEUMATIC SWITCH
ACTUATED MANUALLY,
ELECTRICALLY, OR
PNEUMATICALLY
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NOTE: AIR PRESSURE
APPLIED TO TOP MUST
BE WITHIN 2 PSI (13.78 kPa)
OF REGULATOR OUTLET
VP0137R1
CLEAN DRY AIR
150 PSI (1033 kPa) MAX
IN
OUT
REGULATED
AIR SUPPLY
RV 201
DUAL PRESSURE
REGULATOR
AIR APPLIED
TO TOP
NO AIR APPLIED
TO TOP
HIGHER OF
TWO SETTINGS
LOWER OF
TWO SETTINGS
Figure 2. Dual Air Pressure Regulator Application.
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NOMINAL SPAN FOR INTEGRAL
CHANGE OVER MECHANISM
25 PSIG
(172 kPa)
23 PSIG
(159 kPa)
24 PSIG
(165 kPa)
21 PSIG
(145 kPa)
18 PSIG
(124 kPa)
AIR PRESSURE
ADJACENT TO
AIR COMPRESSOR
OR REGULATOR
PD = 1 PSI (6.9 kPa)
23 PSIG
(159 kPa)
21 PSIG
(145 kPa)
17 PSIG
(117 kPa)
SYSTEM
RECOMMENDED
PRESSURE
PRESSURES
DROP TO
IN PSI (kPa)
HIGH FARTHEST POINT
LOW
18 (124) 25 (172)
1 (6.9)
18 (124) 26 (179)
2 (14)
18 (124) 27 (186)
3 (21)
AIR PRESSURE
AT FARTHEST POINT
IN DISTRIBUTION
PIPING
Figure 3. Typical Dual Pressure System Pressure Settings.
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Siemens Building Technologies, Inc.
Powers Controls™ RV 201 Pressure Reducing Valves
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Specifications
Air capacity
Ambient temperature range
Stability with 25 psig (172 kPa)
change in supply
Repeatability
Physical
150 psig (1033 kPa)
2 to 35 psig (14 to 240 kPa)
35 psig (240 kPa) maximum
2 psig (14 kPa) minimum
0 to 14 psig (0 to 96.5 kPa)
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Maximum inlet pressure
Outlet pressure range:
Single pressure PRV
Dual pressure PRV
Higher pressure
Lower pressure
Differential
Integral relief valve:
Adjustment span
Factory setting
20 to 40 psig (137 to 275 kPa)
30 psig (206 kPa)
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Operating
Piping connections:
Inlet and outlet
Outlet gauge
Pilot chamber (dual pressure PRV)
Filter
Body
Finish
Bracket for wall mounting
Outlet pressure gauge
Within 0.4 psig (2.76 kPa)
Within 0.6 psig (4.13 kPa)
1/4-inch NPT
1/8-inch NPT
1/8-inch NPT
Integral 200 mesh screen filter
Zinc die cast
Iridescent chromate
Standard – all units
2-1/2 inch (64 mm) diameter
0 to 30 psi (0 to 207 kPa)
1/8-inch Allen wrench
Adjustable nut
See Figures 14 and 15
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Adjustments
Primary pressure
Higher pressure (dual pressure PRV)
Dimensions
10 scfm (4720 cm3/S
40 to 140 °F (4.4 to 60 °C)
Siemens Building Technologies, Inc.
Page 3
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Operation
Powers Controls™ RV 201 Pressure Reducing Valves
Pressure regulation is achieved by allowing the actual regulator pressure to
counterbalance the desired pressure setting (spring force). A balanced condition exists
when the two forces are equal. Too high an air pressure unbalances the main
diaphragm assembly toward exhausting or lowering the air pressure. Too low an air
pressure unbalances the diaphragm assembly downward toward opening the supply
valve to admit enough supply air to raise the regulated air pressure.
The design of the RV 201 PRV includes a large diaphragm/supply valve ratio to allow
consistent regulation over a wide flow range.
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Dual pressure regulators include a piston assembly in the upper housing so that a
positive pneumatic pilot signal increases the regulator spring tension (previously
adjusted for lower pressure setting). This forces the regulator to operate at a higher
output pressure.
The pilot operated piston assembly in the upper housing is adjusted for a fixed travel to
ensure consistent repeatability of the higher pressure setting.
ADJUSTMENT
SCREW
LOCKNUT
UPPER
HOUSING
MOUNTING
BRACKET
SPRING
SUPPLY VALVE
PLUNGER
ASSEMBLY
RELIEF VALVE &
DIAPHRAGM
ASSEMBLY
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Sizing
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VP0129R1
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HIGH
PRESSURE
INLET
REGULATED
OUPUT
SCREEN
FILTER
RELIEF VALVE
ASSEMBLY
Figure 4. RV 201 PRV Operation.
Both single and dual pressure PRVs maintain and deliver an acceptable control air
pressure over wide flow variation. The maximum capacity requirement for a PRV can be
defined as the maximum instantaneous demand that can occur. This maximum demand
is higher than the average flow requirements. RV 201 PRV valves are rated for a
nominal 10 scfm (4720 cm3/S) capacity. As system flow requirements increase, a slight
droop or deterioration of control pressure can occur (Figure 5). In a single pressure
system, this control pressure droop has little or no effect on the operation of controls in
the system. However, dual pressure systems require a very stable control air pressure
for proper operation. Particular care should be taken when selecting PRVs for dual
pressure systems to ensure adequate capacity without excessive droop.
Siemens Building Technologies, Inc.
Powers Controls™ RV 201 Pressure Reducing Valves
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
REGULATED PRESSURE
kPa
PSI
27
185
180
26
ACTUAL DELIVERED PRESSURE
175
25
170
165
24
PILOT GAUGE PRESSURE
160
155
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 CFM
0.1500
0.2500
0.3500
0.4500
0.5500
0.6500
0 0.0500
0.1000
0.2000
0.3000
0.4000
0.5000
0.6000
0.7000
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VP0135R1
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FLOW
Figure 5. Chart of Typical Flow Requirements.
Installation
Refer to Figure 3 for typical dual pressure setting.
Adjustment Procedure
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Pressure regulating valves can be used in multiples to accommodate total compressor
capacity, if each PRV is the sole source for a zone or area. Using two PRVs in parallel
at the same pressure setting is not recommended. If this is attempted and the two PRVs
are not operating at exactly identical pressures, the PRV with the lower setting may
bleed constantly.
Regulated Pressure
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The single pressure PRV is easily reset to any desired pressure from 2 to 35 psig
(13.78 to 35 kPa) with the Allen screw adjustment provided (Figure 6). The same
adjustment is used to set the lower pressure for dual pressure PRVs with no air in the
pilot chamber (Figure 7). To reset the higher pressure for dual pressure PRVs, apply full
control pressure to the pilot chamber and turn the adjustment nut until the correct
setting is reached (Figure 8).
For dual pressure PRVs, be certain to adjust the lower pressure before
setting the higher pressure. Any regulated setting of 30 psig (206.7 kPa) or
higher will require resetting the integral relief valve to a higher value.
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CAUTION:
Figure 6. Setting the Single PRV
Pressure.
Siemens Building Technologies, Inc.
Figure 7. Setting the Dual PRV
Lower Pressure.
Figure 8. Setting the Dual PRV
Higher Pressure.
Page 5
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Adjustment Procedure
(Continued)
Powers Controls™ RV 201 Pressure Reducing Valves
Relief Valve
Change the relief valve setting as follows:
1. Loosen the locknut.
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2. Set the regulator for the desired
pressure that should actuate the relief
valve. If necessary, tighten the relief
valve adjustment screw (clockwise) to
prevent the relieving of air pressure.
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3. Slowly turn the relief valve adjustment
screw counterclockwise until the relief
valve opens (Figure 9).
4. Lower the regulator pressure setting
until the relief valve closes.
5. To verify calibration, re-adjust the
regulator pressure upward until the
relief valve opens.
Preventive
Maintenance
Figure 9. Changing the Relief Valve
Setting.
Optimize regulator operation and life as follows:
1. Install an adequate filter on the inlet side of the regulator to prevent particulate
matter from accumulating in the supply and exhaust valve mechanisms.
2. The air supply should be dry and essentially free of excessive water and oil that
could condense within the regulator.
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3. A dust cap is provided on dual pressure PRVs to protect the primary Allen wrench
adjustment screw from accumulated dirt and grime. This cap should remain on the
regulator except when actually adjusting the pressure setting.
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4. For dual pressure PRVs, the upper housing and piston seals should be periodically
cleaned and lubricated to provide an air seal and to prevent unnecessary wear.
Page 6
Siemens Building Technologies, Inc.
Powers Controls™ RV 201 Pressure Reducing Valves
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Corrective
Maintenance
Replacement of Piston
Seals
The following parts are required to replace
the piston seals on the dual pressure PRV:
Replace the piston seals (Figure 10) as
follows:
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1. Remove the upper housing by
removing the four hex head cap
screws.
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047-033 O-ring
201-078 Cup Packing
2. Remove the piston assembly from the
upper housing.
3. Install new O-ring and cup packing in
piston assembly.
NOTE:
Replacement of Relief
Valve and Diaphragm
Assembly
Lubricate the interior surface
of the upper housing with
silicone grease before
replacing the piston assembly.
Figure 10. Replacing the Piston Seals.
The following part is required to replace
the relief valve and diaphragm assembly:
201-060 Relief Valve
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Replace the relief valve and diaphragm
assembly (Figure 11) as follows:
1. Remove the upper housing to gain
access to the relief valve and
diaphragm assembly.
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2. Replace the relief valve and
diaphragm assembly.
3. Reassemble the unit.
Siemens Building Technologies, Inc.
Figure 11. Replacing the Relief Valve.
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Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Renew Valve Plunger
Powers Controls™ RV 201 Pressure Reducing Valves
Renew the valve plunger (Figure 13) as
follows:
1. Remove the upper housing and
diaphragm assembly to gain access to
the valve plunger unit.
3. Replace the O-ring on plunger
assembly and diaphragm spring.
Lubricate the internal surface
of valve plunger housing with
silicone grease before
replacing the unit.
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NOTE:
4. Reassemble the unit.
NOTE:
Renew Valve Assembly
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2. Remove the diaphragm spring and the
plunger assembly.
Figure 12. Renewing the Valve Plunger.
Install the valve plunger spring
with the large diameter upward
toward the diaphragm and
relief valve assembly.
The following parts are required to renew
the valve assembly:
047-117 O-ring
201-074 Spring
Renew the valve plunger (Figure 13) as
follows:
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1. Remove the locknut and relief valve
adjustment screw by turning it
counterclockwise.
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2. Remove the spring and valve disc
assembly.
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3. Inspect and clean the seating surface
if necessary.
Figure 13. Renewing the Valve
Assembly.
4. Replace the O-ring on the disc
assembly and install the new spring.
5. Reassemble the unit.
Siemens Building Technologies, Inc.
Powers Controls™ RV 201 Pressure Reducing Valves
Dimensions
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
2-1/2"
(63.5)
3-5/16"
(84)
6-7/16"
(163.5)
2-1/2"
(63.5)
3-13/32"
(137)
3-7/8"
(98)
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5-1/32"
(128)
VP0133R1
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1-19/32"
(40.5)
3"
(76)
Figure 14. Single Pressure PRV Dimensions in Inches (Millimeters).
2-1/2"
(63.5)
3-5/16"
(84)
6-23/32"
(171)
2-1/2"
(63.5)
5-13/32"
(137)
VP0134R1
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4-1/32"
(102)
5-13/32"
(137)
1-19/32"
(40.5)
3"
(76)
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Figure 15. Dual Pressure PRV Dimensions in Inches (Millimeters).
Siemens Building Technologies, Inc.
Page 9
Technical Instructions
Document Number 155-049P25
Rev. 1, May, 2000
Powers Controls™ RV 201 Pressure Reducing Valves
Construction
Table 1. Single Pressure PRV.
Part Name
No.
Required.
Material
1
201-072
Spring
1
Steel
2
047-117
1/4 x 3/8 x 1/16 O-Ring
1
Rubber
3
201-066
Valve Disc & Pin Assembly
4
201-074
5
6
Steel
047-033
1/2 x 5/8 x 1/16 O-Ring
1
Rubber
201-079
Mounting Bracket
1
Steel
4
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VP0130R1
-
1
3
Figure 16. Single Pressure PRV.
1
Spring
2
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Part No.
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Item
Table 2. Dual Pressure PRV.
7
2
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5
Part No.
Part Name
No.
Required
Material
1
047-033
1/2 x 5/8 x 1/16 O-Ring
1
Rubber
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1
Item
2
201-078
Clip Packing
1
Rubber
3
047-117
1/4 x 3/8 x 1/16 O-Ring
1
Rubber
4
201-074
Spring
1
Steel
5
201-072
Spring
1
Steel
6
201-079
Mounting Bracket
1
Steel
7
201-060
Relief Valve Diaphragm
Assembly.
1
-
VP0131R1
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3
4
Figure 17. Dual Pressure PRV.
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Powers™ is a trademark of Siemens Building Technologies, Inc.
© 2000 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
Landis & Staefa Division
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
Your feedback is important to us. If you have
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Document No. 155-049P25
Printed in the U.S.A.
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