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ELKHART BRASS MANUFACTURING COMPANY
INSTALLATION and OPERATING INSTRUCTIONS
for
PRESSURE-MATIC®
I. Models and Sizes Covered:
UR-20, 1-1/2" size, bonnet types W,X,Y,YZ,Z,ZA,ZB,ZZ & ZZA
UR-25, 1-1/2" size, bonnet types W,X,Y,YZ,Z,ZA,ZB,ZZ & ZZA
UR-20, 2-1/2" size, bonnet types A,B,C,CD,D,DE,E,EF & F
UR-25, 2-1/2" size, bonnet types A,B,C,CD,D,DE,E,EF & F
UR-20S, 2-1/2" size, bonnet types A,B,C,CD,D,DE,E,EF & F
Inlet and Outlet Connections:
*NPT = American National Standard Taper Pipe Threads (ANSI/ASME B1.20.1-1983, R2006)
NH = American National Fire Hose Connection Screw Thread (NFPA 1963-2009 Ed.)
II. Application Guidelines:
A. Automatic Sprinkler Systems
Pressure-Matic® valves are most commonly used in automatic sprinkler systems as floor control valves in highrise buildings where supply riser pressures exceed 175 psi. These valves are listed by Underwriters Laboratories
as Special System Water Control Valves-Pressure Reducing and Pressure Control Type (VLMT), and also meet
the listing requirements for indicating valves. Requirements for the installation of pressure reducing valves in
automatic sprinkler systems are given in Section 4-6.1.2 of NFPA 13, Standard for the Installation of Sprinkler
Systems, Latest Edition. When designing Pressure-Matic® valves into a sprinkler system, the following maximum
flow rate limits should be observed:
98278000 Rev
Valve Model & Size
UR-20, 1-1/2"
UR-25, 1-1/2"
UR-20, 2-1/2"
UR-25, 2-1/2"
UR-20S, 2-1/2"
B
AUTOMATIC PRESSURE REDUCING VALVES
*Inlet Thread
1-1/2" fem. NPT
1-1/2" fem. NPT
2-1/2" fem. NPT
2-1/2" fem. NPT
2-1/2" fem. NPT
*Outlet Thread
1-1/2" fem. NPT
1-1/2" male NH
2-1/2" fem. NPT
2-1/2" male NH
2-1/2" fem. NPT
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Valve Model Bonnet Type Max. Flow (gpm) Max. Pressure (PSI)
A 500 400
B 500 400
C 500 400
UR-20 & UR-25
2-1/2"
UR-20S
2-1/2”
UR-20 & UR-25
1-1/2"
* ULC rated to 400 PSI
** ULC rated to 394 PSI
*** ULC rated to 316 PSI
These valves are also listed as a checking device, which eliminates the need for a separate check valve. When
sprinklers on a given floor are fed from dual risers, the Pressure-Matic® valve acts as a check valve to prevent
loss of sprinkler water supply in the event of damage to one riser.
Supervisory Switch Mounting Brackets
Brackets are available for the attachment of the following listed supervisory switches to the Pressure-Matic®
valves.
Switch Mfr. & Model No. Bracket No.
Potter Electric
System Sensor
CD 500 400
D 500 360
DE 500 330
E 500 290
EF 500 250
F 500 220
A 400 400
400
B
C
CD
D
DE
E
EF
F
W 200
X
Y
YZ
Z
ZA
ZB
ZZ
ZZA 200
OSYS-B
PCVS
PIVS-B
" "
PIVSU-A1
PIVSU-A2
PIBV2
OSY2
400
400
400
400
400
400
400
300*
200
300*
200
300*
200
300**
200
300***
200
200
200
190
80738001
80574001
80736001(
80763001(
for sprinkler application)
hose valve application)
80823001
80823001
80574001
80574001
400
400
400
360
330
290
250
220
280
250
220
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For proper installation of bracket and switch, see instruction sheet which accompanies bracket kit, and also refer
to switch manufacturer's instructions.
Sprinkler System Installation Requirements
1. To permit easy replacement or repair of valve, pipe unions or rubber gasketed mechanical couplings should be
installed immediately upstream or downstream of the valve.
2. A relief valve of not less than 1/2 inch size is to be installed on the downstream side of each Pressure-Matic®
valve.
3. Pressure gauges are to be installed on the inlet and outlet sides of each pressure reducing valve.
4. Valve type should be selected to provide an outlet pressure not exceeding 165 psi at the maximum inlet
pressure.
5. Upon system completion, each Pressure-Matic® valve must be tested under both flow and no-flow conditions
to verify that static and residual outlet pressures and flow rates satisfy system design requirements, per
requirements of Section 8-2.5 of NFPA 13.
B. Standpipe System Applications
With their male hose thread outlet connections, the model UR-25 valves are intended for use as pressure
reducing hose valves in standpipe systems. When hose racks are used, the UR-20 valves can be utilized along
with a special hose nipple for support of the rack. The Pressure-Matic® valves are listed by Underwriters
Laboratories as Standpipe Equipment Pressure Reducing Devices (VUTX). Requirements for the installation of
pressure reducing valves in standpipe systems are given in Section 5-8 of NFPA-14, Standard for the Installation
of Standpipe and Hose Systems, Latest Edition. The 2-1/2" UR-25 can be used for both Class I and Class III
service, while the 1-1/2" version can used for Class II systems. NFPA 14 requires that hose valve outlet pressure
for Class I and Class III service be no greater than 175 psi, and no less than 100 psi. When permitted by the
authority having jurisdiction, pressures less than 100 psi may be allowed, but in no case shall the valve discharge
pressure be less than 65 psi. Class II hose valves must be limited to a maximum residual outlet pressure of 100
psi, but the minimum outlet pressure shall not be less than 65 psi.
Acceptance Tests
Upon completion of system, each Pressure-Matic® hose valve shall be tested in accordance with paragraph 8-5.5
of NFPA 14 to verify that the installation is correct, that the valves are operating properly, and that the inlet and
outlet pressures at the valve are in accordance with the design.
III. Valve Performance Characteristics & Limitations:
A. Valve Construction & Operating Principle
The Pressure-Matic® is a fairly simple pressure reducing valve, which utilizes a hydraulic piston and cylinder
assembly within the valve bonnet to allow the valve to self-throttle in response to the pressure on the downstream
side of the valve. Because the piston, main stem and valve seat float freely from the manual valve stem and
handwheel assembly, the valve is able to self-close under static conditions, and maintain a reduced pressure
under no-flow conditions, as well as under flowing conditions. Valve discharge pressure is transmitted to the top
side of the piston through pressure passages in the main stem. The presence of the piston results in a net area
differential which produces a hydraulic balancing force in the closed direction. The magnitude of this balancing
force is in direct proportion to the hydraulic area of the piston.
The Pressure-Matic® is a non-adjustable pressure reducing valve design, which means that the pressure
reduction ratio of a given valve cannot be varied. However, the valves are available with any of nine (9) different
piston diameters in order to satisfy all expected inlet/outlet pressure ratios. The valve piston size is designated by
a "type" letter, ranging from "A" through "F" for the 2-1/2" valves, and from "W" through "ZZA" for the 1-1/2"
valves. Each valve "type" then provides a fixed pressure reduction ratio, meaning that the outlet pressure will
always be a fixed percentage of the inlet pressure, regardless of inlet pressure. It should be noted, however, that
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this pressure reduction ratio will tend to decrease with increase of flow rate through the valve. This behavior
results due to friction loss through the valve.
B. Valve Type Selection
To determine the correct type (bonnet) for each Pressure-Matic® valve in the system design, please use the
following steps.
1. Determine the standpipe or sprinkler riser residual pressure for each valve location. This is
the inlet pressure at each valve under design flow conditions. In order to accurately determine
these pressures, complete water supply data will be required, including results of municipal
supply flow test, and the pump performance curve. The Pressure-Matic® inlet pressure will be
equal to the sum of the pump discharge pressure and the municipal supply pressure at the design
flow rate, less piping friction loss, and elevation loss.
2. Turn to the appropriate valve performance chart (Figs. I through VIII), based on valve size
and body style. The valve flow range for each chart is indicated in the lower right corner of the
chart. Be sure to use the correct chart for the designed flow rate through the valve.
3. Locate the valve inlet residual pressure on the vertical axis of the chart and draw a line from
this pressure horizontally across the chart.
4. Locate the desired valve outlet residual pressure on the chart horizontal axis and draw a
vertical line from this pressure across the chart.
5. From the intersection of the inlet and outlet pressure lines constructed in (3) and (4) above,
move horizontally to the nearest valve performance curve (actually straight diagonal lines). This
will be the appropriate valve for the chosen location.
EXAMPLE: The residual inlet pressure at a straight pattern sprinkler system floor
control valve is 275 psi at a design flow demand of 280 gpm. The desired
residual outlet pressure is 120 psi. On the appropriate chart (Fig. III) it is seen
that the intersection of the residual inlet and outlet pressure lines fall very close
to the performance curve (straight line) for the "DE" valve. Therefore, the "DE"
valve would be chosen, and would provide an actual residual outlet pressure of
125 psi.
6. Determine the valve static inlet pressure. This will be the sum of the municipal supply static
pressure plus the pump churn pressure, less elevation loss.
7. To determine the valve static outlet pressure, refer to the appropriate static chart (Fig. IX or
X). Locate the valve static inlet pressure on the vertical axis of the chart. Follow across to the
appropriate valve curve (straight line) and drop down to the horizontal axis to read valve outlet
static pressure.
EXAMPLE: For the valve in step (5) above, the static inlet pressure is 290 psi.
Follow the 290 psi inlet pressure line across the chart horizontally to the "DE"
curve. Read the outlet static pressure of 153 psi on the horizontal axis directly
below the point of intersection.
NOTE: If static outlet pressure is found to exceed the maximum outlet pressure allowed by NFPA 13 or NFPA
14, it will be necessary to re-select a valve type to the left of the originally chosen type
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IV. Valve Care & Maintenance:
Pressure-Matic® valves require minimal maintenance, and can normally serve reliably for twenty years or longer
in fire protection systems. However, a routine inspection and testing program is essential for any fire protection
system to insure that it is in proper operating condition. NFPA 25, Standard for the Inspection, Testing and
Maintenance of Water-Based Fire Protection Systems should be consulted for a determination of required test
frequency and methods.
Below is a summary of the required frequency of inspections and testing for pressure reducing valves:
Valve Application
sprinkler system pressure regulating
control valve
hose connection and hose rack assembly
pressure regulating valve
Flow test results should be compared to previous test results, and to system performance criteria. Because the
Pressure-Matics® are non-adjustable type valves, test results should not vary significantly from previous test
results unless the water supply or pump characteristics have changed, resulting in a higher or lower inlet pressure
to the Pressure-Matic® valve. If changes to the water supply result in unsatisfactory performance of the PRV, the
upper bonnet subassembly may be field replaced with a different type to achieve a different reduction ratio.
For information on bonnet subassembly replacement or on any repair parts, please contact:
NOTE: The outlet pressure shown on the following charts
Inspection
quarterly
quarterly
Elkhart Brass Mfg Co
PO Box 1127
Elkhart, IN 46514
574-295-8330
are subject to a tolerance of ±10%.
Flow Test
annually
5-years
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Fig. I Model UR-20S, 2-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
A
B
VALVE OUTLET PRESSURE (PSI)
CCD
D
USE THIS CHART FOR
50-100 GPM FLOW
DE
E
EF
F
Fig. II Model UR-20S, 2-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
A
B
VALVE OUTLET PRESSURE (PSI)
CCD
D
DE
USE THIS CHART FOR
100-200 GPM FLOW
E
EF
F
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Fig. III Model UR-20S, 2-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
A
B
VALVE OUTLET PRESSURE (PSI)
CCD
D
USE THIS CHART FOR
DE
E
EF
F
200-300 GPM FLOW
Fig. IV Model UR-20S, 2-1/2"
A
80
60
50 75 100 125 150 175
PRESSURE (PSI)
VALVE INLET RESIDUAL
400
380
360
340
320
300
280
260
240
220
200
180
160
140
120
100
B
CCD
D
EF
VALVE OUTLET PRESSURE (PSI)
DE
E
F
USE THIS CHART FOR
300-400 GPM FLOW
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Fig. V Model UR-20 & 25, 2-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
A
B
VALVE OUTLET PRESSURE (PSI)
CCD
D
USE THIS CHART FOR
50-400 GPM FLOW
DE
E
EF
F
Fig. VI Model UR-20 & 25, 2-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
A
B
VALVE OUTLET PRESSURE (PSI)
CCD
D
USE THIS CHART FOR
400-500 GPM FLOW
DE
E
EF
F
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ULC APPROVED
Fig. VII Model UR-20 & 25, 1-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
W
X
VALVE OUTLET PRESSURE (PSI)
Y
TO 400 PSI
YZ
Z
ZA
ZB
ZZ
ZZA
USE THIS CHART FOR
50-200 GPM FLOW
ULC APPROVED
Z
ZA
ZB
ZZ
TO 400 PSI
USE THIS CHART FOR
200-250 GPM FLOW
Fig. VIII Model UR-20 & 25, 1-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET RESIDUAL
180
160
140
120
100
80
60
50 75 100 125 150 175
W
X
Y
YZ
ZZA
VALVE OUTLET PRESSURE (PSI)
UL APPROVED
TO 300 PSI
UL APPROVED
TO 300 PSI
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Fig. IX Model UR-20, UR-25 & UR-20S, 2-1/2"
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET STATIC
180
160
140
120
100
80
60
50 75 100 125 150 175
A
VALVE OUTLET PRESSURE (PSI)
B
CCD
USE THIS CHART FOR
STATIC OUTLET
D
DE
E
EF
F
Fig. X Model UR-20 & 25, 1-1/2"
UL APPROVED
400
380
360
340
320
300
280
260
240
220
200
PRESSURE (PSI)
VALVE INLET STATIC
180
160
140
120
100
80
60
50 75 100 125 150 175
TO 300 PSI
W
VALVE OUTLET PRESSURE (PSI)
X
ULC APPROVED
TO 400 PSI
STATIC OUTLET PRESSURE
Y
USE THIS CHART FOR
YZ
Z
ZA
ZB
ZZ
ZZA
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