Product Manual
PRINCE MANUFACTURING CORPORATION • P.O. BOX 7000 • NORTH SIOUX CITY, SOUTH DAKOTA 57049-7000
URL: www.princehyd.com • E-MAIL: prince@princehyd.com • PHONE (605) 235-1220 • FAX (605) 235-1082
O.E.M. CUSTOMER SERVICE: (605) 235-1220 • FAX (605) 235-1082 DISTRIBUTOR CUSTOMER SERVICE: PHONE (605) 235-1220 • FAX (605) 217-6300
V62
VALVES
CATV 01-04-09-02
MODEL RD-1800 PRESSURE RELIEF
MODEL RD-900 SELECTOR VALVE
The PRINCE valve model RD-900 is a manual 3-way 2-position
selector valve. This valve will allow one pump source to supply two
separate circuits. Pushing the handle in diverts oil ow to port away
from handle. Pulling the handle out diverts oil ow to port nearest
handle.
VALVE SPECIFICATIONS
Capacity: 30 gpm max inlet ow
Pressure: 3000 psi max
Weight: 7 lbs.
SEAL KIT 660590025
MODEL RD-900
SELECTOR VALVE
The PRINCE valve model RD-1800 is a direct acting ball/spring type pressure
relief. The valve is compact and simple in design. This type relief is fast
opening and is well suited for pressure spike protection. The performance
curves below indicate the low cracking pressure typical to ball/spring reliefs.
Please refer to the model RV relief for a system pressure relief. The valve is
available with a standard steel seat, model RD-1800S, or with a hardened
seat, model RD-1800H. Both models are externally adjustable.
VALVE SPECIFICATIONS:
Capacity: 20 gpm max inlet ow
Pressure: 2500 psi max
Weight: 2 Ib.
Adjustment Range: 1000 PSI to 2500 PSI
NOTE: Relief settings are 1500 PSI @ 12 GPM.
For non-standard relief settings specify PSI in
hundreds and GPM after model number.
EX: RD-1850S-12-10 for 1200 PSI @ 10 GPM
MODEL RD-1800
BALL/SPRING TYPE
DIRECT ACTING RELIEF
SYMBOL
STANDARD MODELS AVAILABLE
MODEL # PORT SIZES MAX FLOW
RD-1837S 3/8 NPTF 8 GPM
RD-1850H 1/2 NPTF 16 GPM
RD-1850S 1/2 NPTF 16 GPM
RD-1875S 3/4 NPTF 20 GPM
SYMBOL
PRESSURE (PSI)
RELIEF VALVE CURVE
AT VARIOUS SET POINTS
110 SUS OIL AT 115°F.
FLOW (GPM)
TANK
800
671800010
671900001
671500004
671800002
240016074
240016071
.31
4.56
4.13
.87
230017018
0 4
200
400
600
1.75
RD-1800H
1.50
RD-1800S
248 12 2016
2.13
230009014
1.50
670300011
PRESSURE PORT (2)
.69
190100019
2.25
INLET
RD-900
OUTLETS
2.05
.91
3.88
4.49
.265 DIA (2)
1000
1200
1400
1800
1600
2000
T
RD-1800
P
PRESSURE (PSI)
RELIEF VALVE CURVE
AT VARIOUS SET POINTS
110 SUS OIL AT 115°F.
FLOW (GPM)
TANK
800
671800010
671900001
671500004
671800002
240016074
240016071
.31
4.56
4.13
.87
230017018
0 4
200
400
600
1.75
RD-1800H
1.50
RD-1800S
248 12 2016
2.13
230009014
1.50
670300011
PRESSURE PORT (2)
.69
190100019
2.25
INLET
RD-900
OUTLETS
2.05
.91
3.88
4.49
.265 DIA (2)
1000
1200
1400
1800
1600
2000
T
RD-1800
P
PRESSURE (PSI)
RELIEF VALVE CURVE
AT VARIOUS SET POINTS
110 SUS OIL AT 115°F.
FLOW (GPM)
TANK
800
671800010
671900001
671500004
671800002
240016074
240016071
.31
4.56
4.13
.87
230017018
0 4
200
400
600
1.75
RD-1800H
1.50
RD-1800S
248 12 2016
2.13
230009014
1.50
670300011
PRESSURE PORT (2)
.69
190100019
2.25
INLET
RD-900
OUTLETS
2.05
.91
3.88
4.49
.265 DIA (2)
1000
1200
1400
1800
1600
2000
T
RD-1800
P
PRESSURE (PSI)
RELIEF VALVE CURVE
AT VARIOUS SET POINTS
110 SUS OIL AT 115°F.
FLOW (GPM)
TANK
800
671800010
671900001
671500004
671800002
240016074
240016071
.31
4.56
4.13
.87
230017018
0 4
200
400
600
1.75
RD-1800H
1.50
RD-1800S
248 12 2016
2.13
230009014
1.50
670300011
PRESSURE PORT (2)
.69
190100019
2.25
INLET
RD-900
OUTLETS
2.05
.91
3.88
4.49
.265 DIA (2)
1000
1200
1400
1800
1600
2000
T
RD-1800
P
PRESSURE (PSI)
RELIEF VALVE CURVE
AT VARIOUS SET POINTS
110 SUS OIL AT 115°F.
FLOW (GPM)
TANK
800
671800010
671900001
671500004
671800002
240016074
240016071
.31
4.56
4.13
.87
230017018
0 4
200
400
600
1.75
RD-1800H
1.50
RD-1800S
248 12 2016
2.13
230009014
1.50
670300011
PRESSURE PORT (2)
.69
190100019
2.25
INLET
RD-900
OUTLETS
2.05
.91
3.88
4.49
.265 DIA (2)
1000
1200
1400
1800
1600
2000
T
RD-1800
P
STANDARD MODELS
MODEL # PORT SIZES
RD-950 1/2 NPTF
RD-975 3/4 NPTF