Variable Volume Vane Pumps Models SV-20 & SV-25 Flange ...

1 Industrial HydraulicsGPM @MAXIMUMPRESSURETHEORETICALINPUT HPMODEL100 PSI &PRESSUREMAXIMUMCOMPENSATINGDISPLACEMENT @MAX PSI1800 RPM(PSI)RPMRANGE (PSI)RANGE (PSI)& 1800 1000 1800 300-1000 Volume Vane PumpsModels SV-20 & SV-25 Flange & SubplateMountedENGINEERING DATAQ uick Reference ChartSTANDARD PUMP The SV pump is a pressure compensatedvane pump and is available in four basic displacements; one, two,four and eight cubic inches.

2 This bulletin covers the Model SV-20 (two cubic inch displacement) and variations of it all of which aredimensionally the same. The SV-25 is a modified SV-20 whichuses a different ring to allow the ring to shift further and increasethe displacement. By increasing the ring stroke, the vanes extendfurther and requires the maximum pressure rating to be the flow of the basic pump allows the design engineerto reduce circuit costs by using a smaller pump instead ofselecting the next larger size provided the reduced pressure ratingis PRESSURE PUMP On some applications, such asgrinders, the pump must compensate at very low pressures whichare not within the normal compensating range of the standardpump.

3 By making internal modifications to the standard pump, thecompensating range can be reduced to create a low pressure pump for this kind of SV-20 & SV-259 535 233 240 Low Pressure SV-25 & SV-259 535 233 241 PUMP MODELSERVICE BULLETINFor repair parts, refer to the servicebulletin listed in the Literature Disclaimer: Specifications and/ordimensions are subject to change without prior consult Data Variable Volume Vane Pumps Models SV-20 & SV-25 Bosch RexrothPRESSURE RATING SV-20 2000 psi (138 bar) SV-25 1000 psi (69 bar)PRESSURE COMPENSATING RANGE SV-20 375-2000 psi (26-138 bar) two stage compensator300-2000 psi (23-138 bar) single stage compensatorSV-25 300-1000 psi (21-69 bar) two stage compensator280-1000 psi (19-69 bar) single stage compensatorFLOW @ 1800 RPM SV-20 15 gpm ( l/min)

4 @ 1900 psiSV-25 gpm ( l/min) @ 900 psiTHEORETICAL DISPLACEMENT SV-20 2 in3/rev ( ml/rev) SV-25 in3/rev ( ml/rev)MAXIMUM INLET VACUUM AT SEA LEVEL 6 in. Hg (152 mm Hg)3 in. Hg (76mm HG) with fluids containing waterMAXIMUM CASE PRESSURE 10 psi ( bar)Case drain line should be full intended size (not reduced down).Case pressure spikes can be minimized by using as straight anddirect path to tank as possible. Other drain lines should not beconnected to the pump drain line. Always terminate the drain linebelow the fluid level in the reservoir.

5 Failure to do so will result inloss of pump prime approximately 30 minutes after it is shut downand possible introduction of air into the circuit. Case drain lineshould be routed to the opposite side of the baffle in relation tothe suction DRAIN FLOW The values listed below are the averageflows which occur only when the pump is compensating. Whenthe pump is not compensating, the values are much in3/min ( l/min) @ 1000 psi (69 bar)150 in3/min ( l/min) @ 1500 psi (103 bar)200 in3/min ( l/min) @ 2000 psi (138 bar)DRIVE SPEED RANGE 750-1800 rpm(Consult factory Applications department for higher speeds.)

6 MOUNTING Available in the following:SubplateSAE 2-bolt Flange , side or rear ported (SAE straight thread of 4-bolt Flange Connection.)ROTATION Rotation is always determined when viewing theshaft end. Rotational arrows are cast into the body of all hand rotation is standard. Left hand rotation Pumps are nolonger Viton seals are standard. Buna seals are no A 10 micrometer return line filter is recommendedfor increased pump life. If a suction strainer is used, it should notbe finer than 100 mesh (149 micrometer) when using petroleumfluids.

7 The higher specific gravity of fire resistant fluids and thehigher vapor pressure of water containing fluids will aggravate thepump inlet conditions. If a suction strainer is used with thesefluids, the mesh must be coarser (60 mesh or 238 micrometer)than what is used with petroleum oil of the surface area increasedto reduce the pressure drop. Bosch rexroth does notrecommend the use of inlet suction LOAD Radial and axial forces on the shaft are notrecommended. Pump and prime mover should be mounted withshafts inline (coaxial) and connected with a flexible coupling.

8 Consultfactory Applications department for applications with overhung ADDITIONAL HP ON THRU SHAFT 20 HP (15 Kw) @ 1800 Hp (10 Kw) @ 1200 rpmFLUID RECOMMENDATIONS A premium quality hydraulic oilwith zinc complex anti-wear additives is highly to Bosch rexroth Group publication 9 535 233 456, Petroleum Hydraulic Fluids for a list of fluids which meet orexceed the Bosch rexroth lubrication compensate for the reduced lubrication values of even thepremium quality water containing fluids (glycols and water-in-oilemulsions)

9 , it is necessary to limit system pressure to the valueslisted in the table below for an equivalent to Bosch rexroth Group publication 9 535 233 457, FireResistant Fluids , for further details on fluid selection. Fluidsuppliers should be consulted regarding proper fluid maintenancewhen using fire resistant fluids containing The temperature of the fluid in the reservoirshould not exceed 130 F (54 C). The pump will operate with fluidat higher temperatures provided the viscosity is within therecommended range. under no circumstances should the oiltemperature exceed 160 F (71 C).

10 When using fire resistant fluidscontaining water, the fluid temperature should not exceed 120 F(49 C) to prevent an excessive rate of water )tSc45-23(ytisocsiVgnitarepOmuminiMSUS00 1)tSc12(ytisocsiVgnitarepOmumixaMSUS0001 )tSc512(ytisocsiVpu-tratSmumixaMSUS0004) tSc468(Standard PumpEngineering Data Variable Volume Vane Pumps Models SV-20 & SV-253 Bosch RexrothLow Pressure PumpSCREW Volume CONTROL The screw Volume control is anadjustable stop which is used to reduce the maximum pump flowand is optional. Turning clockwise will reduce the flow in directproportion to the displacement of the adjusting screw.