ENGINEERING DATA Industrial Hydraulics

Variable Volume Vane Pumps

Models SV-20 & SV-25

Flange & Subplate
Mounted

SYMBOL

Quick Reference Chart

GPM @ MAXIMUM PRESSURE THEORETICAL INPUT HP

MODEL 100 PSI & PRESSURE MAXIMUM COMPENSATING DISPLACEMENT @MAX PSI
1800 RPM (PSI) RPM RANGE (PSI) RANGE (PSI) & 1800 RPM
Standard
15 2000 1800 375-2000 1.9 20
SV-20
Standard
20 1000 1800 300-1000 2.56 20.3
SV-25
Low Pressure
15 750 1800 175-750 1.9 7.25
SV-20
Low Pressure
20 750 1800 175-750 2.56 9.75
SV-25

STANDARD PUMP – The SV pump is a pressure compensated LOW PRESSURE PUMP – On some applications, such as
vane pump and is available in four basic displacements; one, two, grinders, the pump must compensate at very low pressures which
four and eight cubic inches. This bulletin covers the Model SV-20 are not within the normal compensating range of the standard
(two cubic inch displacement) and variations of it all of which are pump. By making internal modifications to the standard pump, the
dimensionally the same. The SV-25 is a modified SV-20 which compensating range can be reduced to create a “low pressure”
uses a different ring to allow the ring to shift further and increase pump for this kind of application.
the displacement. By increasing the ring stroke, the vanes extend
further and requires the maximum pressure rating to be reduced.
Increasing the flow of the basic pump allows the design engineer
to reduce circuit costs by using a smaller pump instead of
selecting the next larger size provided the reduced pressure rating
is adequate.

PUMP MODEL SERVICE BULLETIN

Standard SV-20 & SV-25 9 535 233 240
Low Pressure SV-25 & SV-25 9 535 233 241

Product Literature Disclaimer: Specifications and/or

For repair parts, refer to the service dimensions are subject to change without prior notice.
bulletin listed in the table. Please consult factory.
 2 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

Standard Pump

PRESSURE RATING – FILTRATION – A 10 micrometer return line filter is recommended

SV-20 – 2000 psi (138 bar) for increased pump life. If a suction strainer is used, it should not
SV-25 – 1000 psi (69 bar) be finer than 100 mesh (149 micrometer) when using petroleum
fluids. The higher specific gravity of fire resistant fluids and the
PRESSURE COMPENSATING RANGE – higher vapor pressure of water containing fluids will aggravate the
SV-20 – 375-2000 psi (26-138 bar) two stage compensator pump inlet conditions. If a suction strainer is used with these
300-2000 psi (23-138 bar) single stage compensator fluids, the mesh must be coarser (60 mesh or 238 micrometer)
SV-25 – 300-1000 psi (21-69 bar) two stage compensator than what is used with petroleum oil of the surface area increased
280-1000 psi (19-69 bar) single stage compensator to reduce the pressure drop. Bosch Rexroth does not
recommend the use of inlet suction strainers.
FLOW @ 1800 RPM –
SV-20 – 15 gpm (56.8 l/min) @ 1900 psi OVERHUNG LOAD – Radial and axial forces on the shaft are not
SV-25 – 20.25 gpm (75.7 l/min) @ 900 psi recommended. Pump and prime mover should be mounted with
shafts inline (coaxial) and connected with a flexible coupling. Consult
THEORETICAL DISPLACEMENT – factory Applications department for applications with overhung load.
SV-20 – 2 in3/rev (32.8 ml/rev)
SV-25 – 2.6 in3/rev (42.6 ml/rev) MAXIMUM ADDITIONAL HP ON THRU SHAFT –
20 HP (15 Kw) @ 1800 rpm
MAXIMUM INLET VACUUM AT SEA LEVEL – 13.25 Hp (10 Kw) @ 1200 rpm
6 in. Hg (152 mm Hg) FLUID RECOMMENDATIONS – A premium quality hydraulic oil
3 in. Hg (76mm HG) with fluids containing water with zinc complex anti-wear additives is highly recommended.
Refer to Bosch Rexroth Group publication 9 535 233 456,
MAXIMUM CASE PRESSURE – 10 psi (0.7 bar) “Petroleum Hydraulic Fluids” for a list of fluids which meet or
Case drain line should be full intended size (not reduced down). exceed the Bosch Rexroth lubrication requirements.
Case pressure spikes can be minimized by using as straight and
direct path to tank as possible. Other drain lines should not be Optimum Viscosity at 150-250 SUS
connected to the pump drain line. Always terminate the drain line Operating Temperature (32-54 cSt)
below the fluid level in the reservoir. Failure to do so will result in
loss of pump prime approximately 30 minutes after it is shut down 100 SUS
and possible introduction of air into the circuit. Case drain line Minimum Operating Viscosity
(21 cSt)
should be routed to the opposite side of the baffle in relation to
the suction line. 1000 SUS
Maximum Operating Viscosity
(215 cSt)
CASE DRAIN FLOW – The values listed below are the average
4000 SUS
flows which occur only when the pump is compensating. When Maximum Start-up Viscosity
(864 cSt)
the pump is not compensating, the values are much lower.
To compensate for the reduced lubrication values of even the
100 in3/min (1.6 l/min) @ 1000 psi (69 bar) premium quality water containing fluids (glycols and water-in-oil
150 in3/min (2.5 l/min) @ 1500 psi (103 bar) emulsions), it is necessary to limit system pressure to the values
200 in3/min (3.3 l/min) @ 2000 psi (138 bar) listed in the table below for an equivalent life.

DRIVE SPEED RANGE – 750-1800 rpm Water-in-Oil

(Consult factory Applications department for higher speeds.) Water Glycol
Emulsion

MOUNTING – Available in the following: Maximum Pressure 1500 psi 1000psi

Subplate
SAE 2-bolt Flange, side or rear ported (SAE straight thread of 4- Maximum RPM 1800 rpm 1200 rpm
bolt Flange Connection.) Refer to Bosch Rexroth Group publication 9 535 233 457, “Fire
Resistant Fluids”, for further details on fluid selection. Fluid
ROTATION – Rotation is always determined when viewing the suppliers should be consulted regarding proper fluid maintenance
shaft end. Rotational arrows are cast into the body of all pumps. when using fire resistant fluids containing water.
Right hand rotation is standard. Left hand rotation pumps are no
longer available. TEMPERATURE– The temperature of the fluid in the reservoir
should not exceed 130°F (54°C). The pump will operate with fluid
SEALS – Viton seals are standard. Buna seals are no longer at higher temperatures provided the viscosity is within the
available. recommended range. under no circumstances should the oil
temperature exceed 160°F (71°C). When using fire resistant fluids
containing water, the fluid temperature should not exceed 120°F
(49°C) to prevent an excessive rate of water evaporation.
 Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 3

SCREW VOLUME CONTROL– The screw volume control is an SHAFT ALIGNMENT – Shaft alignment should be within 0.003"
adjustable stop which is used to reduce the maximum pump flow total indicator reading. If the shafts are not properly aligned,
and is optional. Turning clockwise will reduce the flow in direct increased mechanical noise from the unit will result.
proportion to the displacement of the adjusting screw. During
initial start-up, the flow setting should be at least 50% of the START-UP – To insure priming on initial start-up, air in the pump
maximum pump flow. and inlet must be allowed to escape. If the pump outlet is normally
blocked, it must be temporarily vented. This can be accomplished
SV-20 – 1/4 turn (90°) clockwise will reduce the flow by opening the valve, temporarily cracking a fitting, or installing an
approximately 2.2 gpm (8.3 l/min) when the pump is air bleed valve.
driven at 1800 rpm.
SV-25 – 1/4 turn (90°) clockwise will reduce the flow CONTROL OPTIONS – Many energy saving controls are available
approximately 2.9 gpm (11 l/min) when the pump is in addition to the standard two-stage pressure compensator.
driven at 1800 rpm. Refer to Bosch Rexroth publication 9 535 233 092 for
performance and dimensional data.
When a volume control is used to reduce the maximum flow of the
pump, the horsepower required to drive the pump is also reduced. COMBINATION MOUNTING – To simplify multi-pump circuits,
To determine the input HP, use the following formula: adapter kits are available to mount additional pumps in
combination on the rear cover of the flange mounted (side ported)
Input gpm x psi pumps. Refer to Bosch Rexroth publication 9 535 233 094 for
= + Deadhead HP at the compensator setting horsepower limitations, adapters available, dimensional data and
HP 1714
How-To-Order.
MOUNTING POSITION – Unrestricted. Caution must be
exercised with vertical mounting to prevent the weight or end WEIGHT (Approximate) –
thrust of the prime mover from being applied to the pump shaft. Subplate Mounted Pump . . . . . . . . . . . . . . . . . . .65 lbs. (29.5 Kg)
Flange Mounted Pump . . . . . . . . . . . . . . . . . . . . .70 lbs. (31.8 Kg)
Add for Screw Volume Control . . . . . . . . . . . . . . . . .1 lb. (0.5 Kg)
Add for Thru Shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . .1lb. (0.5 Kg)

Low Pressure Pump

NOTE: All of the specifications for the standard pump also

pertain to the low pressure pump except those listed
below.

PRESSURE RATING – CASE DRAIN FLOW – 210 in3/min (3.4 l/min) is the average flow
SV-20 – 750 psi (52 bar) which will occur only when the pump is compensating at 750 psi
SV-25 – 750 psi (52 bar) (52 bar). When the pump is not compensating, the values are
much lower.
PRESSURE COMPENSATING RANGE –
SV-20 – 175-750 psi (12-52 bar) ROTATION – Right hand only. Clockwise when viewing shaft end.
SV-25 – 175-750 psi (12-52 bar)
SEALS – Viton seals are standard.
FLOW @ 1800 RPM –
SV-20 – 15 gpm (56.8 l/min) @ 650 psi (45 bar) SCREW VOLUME CONTROL– The screw volume control is standard.
SV-25 – 20 gpm (75.7 l/min) @ 650 psi (45 bar)
4 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

Performance Characteristics – Standard Pump

Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 5

Performance Characteristics – Low Pressure Pump

6 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

Dimensional Data – RH Subplate Mounted

Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 7

Dimensional Data – LH Subplate Mounted

(No longer available)
8 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

Dimensional Data – RH Flange Mounted, Side Ported

Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 9

Dimensional Data – RH Flange Mounted, Rear Ported

10 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

Dimensional Data – LH Flange Mounted, Side Ported

(No longer available)

Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 11

Dimensional Data – LH Flange Mounted, Rear Ported

(No longer available)

 12 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

Dimensional Data – Foot Bracket, (PSV-20-70B)

Bolt kit B-90 is included to mount the

pump to the foot bracket. Consists of 2
each 1/2-13 x 11/4 hex head screw.

The center line height of the shaft of an

electric motor can be determined by
dividing the first two numbers of the motor
frame size by four.

INCHES
(MILLIMETERS)

NOTE:
UNLESS OTHERWISE SPECIFIED
ALL DIMENSIONS ARE NOMINAL.

Dimensional Data – Subplate, (PSV-20-20S-10)

The height of the pump shaft

center line is 6.25 inches
(158.8 mm) when the pump
is mounted to the subplate.

When subplate is not used, a machined

pad as shown by clear area must be
provided for mounting. Pad must be flat
within 0.0003 in/in with a surface finish of
63 RMS.

Bolt kit B-16 is included to mount the

pump to the subplate. Consists of 4 each
7/16-14 x 11/4 socket head cap screws.

INCHES
(MILLIMETERS)

NOTE:
UNLESS OTHERWISE SPECIFIED
ALL DIMENSIONS ARE NOMINAL.
Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 13

How to Order – Standard Pump

PSV – PNSF – 20HRM – 56

DESIGN DIGIT
–56 (Subplate Mounted only)
–66 (Flange Mounted only)
MOUNTING
S – Subplate
A – Flange, Side Ported SHAFT
(SAE Straight Thread) M – Keyed Shaft Medium Length
B – Flange, Rear Ported D – Thru Shaft Medium Length
(SAE Straight Thread) (Subplate Mounted only)
C – Flange, Side Ported
(4 Bolt Flanged Connections) ROTATION (Viewing Shaft End)
R – Flange, Rear Ported R – Right Hand (Clockwise)
(4 Bolt Flanged Connections) L – Left Hand (Counterclockwise)
CONTROL OPTIONS PRESSURE RATING
N – No Volume Control H – 2000 PSI
S – Screw Volume Control E – 1000 PSI (SV-25 only)
CONTROL OPTIONS
P – Standard Pressure Compensator FLOW
*S –Solenoid Two-Pressure (Normally 20 – 15 GPM @ 1800 RPM
Low, Energize for High Pressure) 25 – 20 GPM @ 1800 RPM
*H –Solenoid Two-Pressure (Normally
SEALS
High, Energize for Low Pressure)
F – Viton Seals
*V – Solenoid Two-Pressure (Normally
Vented, Energize for High Pressure)
J – Hydraulic Two-Pressure (Normally
Low, Energize for High Pressure) SOLENOID VOLTAGE AVAILABLE
L – Load Sensing 110/115 VAC 50/60 Hz (Dual frequency)
T – Torque Limiting 220/230 VAC 50/60 Hz (Dual frequency)
K – Single Stage Compensator 12 VDC
*Indicate the desired solenoid voltage and 24 VDC
frequency at the end of the pump code. For Solenoids with quick connect
To order the lock for the compensator adjusting (Hirschmann type) consult factory
screw, specify “LOCK” at the end of the code.

How to Order – Low Pressure Pump

PSV – PSSF – 20DRM – 56
DESIGN DIGIT
–56 (Subplate Mounted only)
–66 (Flange Mounted only)
SHAFT
MOUNTING
M – Keyed Shaft Medium Length
S – Subplate
A – Flange, Side Ported ROTATION (Viewing Shaft End)
(SAE Straight Thread) R – Right Hand (Clockwise)
B – Flange, Rear Ported
(SAE Straight Thread) PRESSURE RATING
C – Flange, Side Ported D – 750 PSI
(4 Bolt Flanged Connections)
R – Flange, Rear Ported FLOW
(4 Bolt Flanged Connections) 20 – 15 GPM @ 1800 RPM
25 – 20 GPM @ 1800 RPM
VOLUME CONTROL
S – Screw Volume Control SEALS
CONTROL F – Viton Seals
P – Standard Pressure Compensator
 14 Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch Rexroth

How to Order

Subplate
Subplate and mounting bolts are not included with
Height of Pump
* Subplate subplate mounted pumps and must be specified in
Center Line When
Model Number addition to the pump.
Mounted to Subplate

PSV-20-20S-10 6.25 Example: (1) PSV-PNSO-20HRM-56 Pump

P/N 725309 (158.8 mm) (1) PSV-20-20S-10 Subplate

* Includes bolt kit B-16 to mount pump to subplate.

Foot Bracket
Foot bracket and mounting bolts are not included
Height of Pump
* Bracket Model with flange mounted pumps and must be specified
Center Line When
Number in addition to the pump
Mounted to Subplate

PSV-20-70B 7.00 Example: (1) PSV-PSCO-20HRM-66 Pump

P/N 959770 (177.8 mm) (1) PSV-20-70B Bracket

* Includes bolt kit B-90 to mount pump to bracket.

Flange Kit
Flanges are not included with pumps which have 4
Flange Kit No. Consists of: bolt flange ports and must be specified in addition
to the pump
1 Ea – 11/2" NPT Flange (Inlet)
4 Ea – 1/2-13 x 1.75 Socket Head Cap Screw Example: (1) PSV-PSCO-20HRM-66 Pump
PSV-20-20F-60 1 Ea – 1/8 x 17/8 x 21/8 O-ring (1) PSV-20-20F-60 Flange Kit
P/N 953638 1 Ea – 1" NPT FLange (Outlet)
4 Ea – 3/8-16 x 1.5 Socket Head Cap Screw
1 Ea – 1/8 x 115/16 x 19/16 O-ring
Bosch Rexroth Engineering Data Variable Volume Vane Pumps Models SV-20 & SV-25 15
 Bosch Rexroth Corporation
Industrial Hydraulics Division
2315 City Line Road
Bethlehem, PA 18017
Phone (610) 694-8300
Fax (610) 694-8467
www.boschrexroth-us.com

Bosch Rexroth Corporation*#

Pneumatics
P.O. Box 13597
1953 Mercer Road
Lexington, KY 40511-1021
Phone (859) 254-8032
Fax (859) 254-4188
(800) 489-4188
Email: customer.pneumatics
@boschrexroth-us.com
www.boschrexroth-us.com

Bosch Rexroth Corporation

Electric Drives and Controls
5150 Prairie Stone Parkway
Hoffman Estates, IL 60192-3707
Phone (847) 645-3600
Fax (847) 645-6201
Email: info@indramat.com
www.boschrexroth-us.com

Bosch Rexroth Corporation

Linear Motion and
Assembly Technologies
816 East Third Street
Buchanan, MI 49107
Phone (616) 695-0151
Fax (616) 695-5363
www.boschrexroth-us.com

Bosch Rexroth Corporation*

Mobile Hydraulics Division
P.O. Box 395
1700 Old Mansfield Road
Wooster, OH 44691-0394
Phone (330) 263-3300
Fax (330) 263-3333
Email: info@rexroth.com
www.boschrexroth-us.com

Bosch Rexroth AG
Zum Eisengiesser 1
D-97816 Lohram Main
Telefon +49 (0) 93 52/18-11
Fax +49 (0) 93 52/18-11 90
Email: pr@rexroth.de
www.boschrexroth.de

*ISO9001 Certified Quality System

#QS9000 Certified Quality System

For more information, you may contact your nearest Bosch Rexroth distributor:

9 535 233 089 4/02