PVK Pumps

PVK Pump Features

• Controls are Easily Field Convertible.– By using pilot control modules (PCM’s) for

various control functions.

P Control Module

Load Sense Module

Load Sense Connector Module

Visual Stroke Indicator

PVK Pump Features

• Hydrodynamic Cylinder Barrel Bearing– Allows for a more compact design

PVK Pump Features

• Hydrodynamic Cylinder Barrel Bearing– Allows for a more compact design– Enables operation on low viscosity or special

fluids.

PVK Pump Features

• Hydrodynamic Cylinder Barrel Bearing– Allows for a more compact design– Enables operation on low viscosity or special

fluids.– Provides infinite bearing life

PVK Pump Features

• Hydrodynamic Cylinder Barrel Bearing– Allows for a more compact design– Enables operation on low viscosity or special

fluids.– Provides infinite bearing life– Permits the pump to operate continuously at

high pressure, without degradation of the bearings.

Hydrodynamic Bearing

PVK Pump Features

• Outboard Driveshaft Bearing Design– Pre-lubricated

PVK Pump Features

• Outboard Driveshaft Bearing Design– Pre-lubricated– Oversized

PVK Pump Features

• Outboard Driveshaft Bearing Design– Pre-lubricated– Oversized– Allows the pump to operate on special and low

viscosity fluids.

PVK Pump Features

• Outboard Driveshaft Bearing Design– Pre-lubricated– Oversized– Allows the pump to operate on special and low

viscosity fluids.– Allows the pump to operate continuously at

high pressure.

Pre-lubricated, oversized driveshaft bearing

PVK Pump Features

• Swashblock and Saddle Design– Eliminates troublesome yolk bearings

PVK Pump Features

PVK Pump Features

Saddle & Bearings

Saddle Bearings & Saddle

PVK Pump Features

• Swashblock and Saddle Design– Eliminates troublesome yolk bearings– Increased Bearing Area vs Needle or Roller

Bearings.

PVK Pump Features

• Swashblock and Saddle Design– Eliminates troublesome yolk bearings– Increased Bearing Area vs Needle or Roller

Bearings.• Pressure Lubricated Swashblock

• More consistent control response

PVK Pump Features

Pressure Lube Galleries

PVK Pump Features

• Swashblock and Saddle Design– Eliminates troublesome yolk bearings– Increased Bearing Area vs Needle or Roller

Bearings.• Pressure Lubricated Swashblock

• More consistent control response• Allows for operation on special and low viscosity

fluids.

PVK Features

• Optional Minimum and Maximum Volume Stops– Allows the customer to tailor pump flows to his

exact needs.

Optional Minimum Volume Stop Standard Maximum Volume Stop

PVK Features

• Caution: When using a minimum volume stop a full flow high pressure relief valve must be used.

PVK Pump Features

• Quiet Valve Plate & Port Plate– Minimizes noise at typical electric motor

speeds.

PVK-140 Quiet Valve Plate

PVK 270/370 Quiet Port Plate

PVK Pump Features

• Quiet Valve Plate– Minimizes noise at typical electric motor

speeds.• This is accomplished by porting the trapped high

pressure oil in the cylinder barrel, through the de-compression orifice, into the pump case

De-compressed oil is bled into the pump case instead of the inlet port.

Port Plate for PVK-270

De-compression orifice

Port Plate for PVK-270

De-compression exhaust

PVK Pump Features

• Quiet Valve Plate– Minimizes noise at typical electric motor

speeds.• This is accomplished by porting the trapped high

pressure oil in the cylinder barrel, through the de-compression orifice, into the pump case.

• Compression Slot slowly compresses the oil in the pumping piston chamber, before being fully connected to the outlet port.

Compression Slot

Inlet Port

De-compression V slot

The Competition

• What happens to oil when it ported through a flow control?

• What happens to oil when it ported through a flow control?– 1. A pressure drop is created.

• What happens to oil when it ported through a flow control?– 1. A pressure drop is created.

• Creating heat.

• What happens to oil when it ported through a flow control?– 1. A pressure drop is created.

• Creating heat.– 2. Fluid is accelerated.

• What happens to oil when it ported through a flow control?– 1. A pressure drop is created.

• Creating heat.– 2. Fluid is accelerated.

• Creating turbulent flow.

• Where is this hot, turbulent going?

• Where is this hot, turbulent going?

–Back into the rotating group!

Inlet Port

De-compression V slot

PVK Pump Features

• Thru-Shaft (standard)– 100% thru-shaft torque capability

PVK Pump Features

• Thru-Shaft (standard)– 50% thru-shaft torque capability*

• Enables multiple pump installations from one drive source.

• * Consult Factory for Higher Torque Capabilities

Thru-shaft

Cover Plate

PVK Pump Features

• Hard-on-Hard Running Surfaces (PVK-140)– Provides greater contamination resistance.

Hardened running surfaces

PVK-140

PVK Pump Features

• Hard-on-Hard Running Surfaces (PVK-140)– Provides greater contamination resistance.– Allows for operation on special and low

viscosity fluids.

PVK Pump Features

• Hard-on-Hard Running Surfaces– Provides greater contamination resistance.– Allows for operation on special and low

viscosity fluids.– Helps facilitate longer pump life.

PVK Pump Features

• Hard-on-Hard Running Surfaces– Provides greater contamination resistance.– Allows for operation on special and low

viscosity fluids.– Helps facilitate longer pump life.– ISO Contamination Rating of 18/15

PVK Pump Specifications

• Two Frame Sizes– SAE “D” Four-bolt Mount

PVK Pump Specifications

• Two Frame Sizes– SAE “D” Four-bolt Mount– SAE “F” Four-bolt Mount

PVK SAE 4-Bolt Mounts

6.00 7.00

PVK-140 PVK-270/370

SAE “D” SAE “F”

PVK Specifications

• A Variety of Controls to choose from

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

• P-2NN Two Pressure Compensator

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

• P-2NN Two Pressure Compensator• P-3NN Three Pressure Compensator

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

• P-2NN Two Pressure Compensator• P-3NN Three Pressure Compensator• P-C** Single Pressure w/ N.O. Soft Start

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

• P-2NN Two Pressure Compensator• P-3NN Three Pressure Compensator• P-C** Single Pressure w/ N.O. Soft Start• P-D** Two Pressure w/ N.O. Soft Start

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

• P-2NN Two Pressure Compensator• P-3NN Three Pressure Compensator• P-C** Single Pressure w/ N.O. Soft Start• P-D** Two Pressure w/ N.O. Soft Start• P-E** Three Pressure w/ N.O. Soft Start

PVK Specifications

• A Variety of Controls to choose from– P-1NN Single Pressure Compensator

• P-2NN Two Pressure Compensator• P-3NN Three Pressure Compensator• P-C** Single Pressure w/ N.O. Soft Start• P-D** Two Pressure w/ N.O. Soft Start• P-E** Three Pressure w/ N.O. Soft Start• P-RNN Remote (“P” Control off pump)

PVK Specifications

• “P” Controls cont.• P-A** N.O. Proportional Pressure Compensator

PVK Specifications

• “P” Controls cont.– P-A** N.O. Proportional Pressure Compensator– P-B** N.C. Proportional Pressure Compensator

PVK Specifications

• “P” Controls cont.– P-ANN N.O. Proportional Pressure Compensator– P-B N.C. Proportional Pressure Compensator

• Optional Control Modifiers– /F Load Sensing

PVK Specifications

• “P” Controls cont.– P-ANN N.O. Proportional Pressure Compensator– P-B N.C. Proportional Pressure Compensator

• Optional “P” Control Modifiers– /F Load Sensing– /G Horsepower Limiting w/ Load Sensing

PVK Specifications

• “P” Controls cont.– P-ANN N.O. Proportional Pressure Compensator– P-B N.C. Proportional Pressure Compensator

• Optional “P” Control Modifiers– /F Load Sensing– /G Horsepower Limiting w/ Load Sensing– /H Horsepower Limiting

PVK Specifications

• V-M Electronic Servo Control– 2 Servo Valve Sizes Available for Fast or

Slower Response.• 25 Liter Servo Valve• 50 Liter Servo Valve

PVK Specifications

• V-M Electronic Servo Control– 2 Servo Valve Sizes Available for Fast or

Slower Response.• 25 Liter Servo Valve• 50 Liter Servo Valve

– * requires a separate pilot source

– LVDT Pump Feedback• Feeds back pump position

PVK Specifications

• RU Control– Two Position Pump Control

• Two adjustable deliveries

PVK Specifications

• RU Control– Two Position Pump Control

• Two adjustable deliveries• Uses Standard CETOP 3 Pilot Valve

– * requires a separate pilot source

PVK Pump Specifications

UNIT THEORETICAL RATED MAXIMUM FLOW RATE POWER INPUTMAXIMUM CONTINUOUS PRESSURE at 1800 rpm at rated contin.

DISPLACEMENT PRESSURE rated contin. pressure

pressure and 1800 rpm

in3/rev ml/rev psi bar psi bar gpm I/min hp kw

140 8.61 141 5000 345 5800 400 63 238,7 207.2 154,6

270 16.3 267 5000 345 5800 400 120 454,8 392.3 292,8

370 22.4 367 3500 241 4250 293 162.1 614,4 389.4 290,6

PVK Pump Specifications

• Caution:– PVK 270 and 370’s are specifically balanced

for 1200 rpm or 1800 rpm. – When ordering, please specify the electric

motor drive speed.

PVK Pump Specifications

• Caution: The PVK-270/370 requires 35 psia at the inlet in order to operate at 1800 rpm.

SPECIFICATIONS PVK-140 PVK-270 PVK-370

DRIVEMaximum RPM Flooded Inlet Supercharged Inlet

Minimum RPM Flooded Inlet Supercharged Inlet

Torque to turn shaft (ft. lbs.)

18002400

600600

15

1500 1800*

600600

60

1500 1800*

600600

60

InletPressure (psia) 1800 rpm 1500 rpm 1200 rpm

13.710.08.0

35.013.010.5

35.014.011.0

PVK Viscosity & Temperature Specifications

SPECIFICATIONS PVK-140 PVK-270 PVK-370Fluid Also see “Additional Notes” For filtration & contamination levels

Viscosity SSU Minimum Maximum

802000

802000

802000

Operating Temperature (F°)* Inlet Maximum Minimum Case Range

200-20

150-250

150-20

150-200

150-20

150-200

*Minimum and maximum viscosities should be observed

PVK-140 LH Valve PlateControl Cylinder Bore

LH Valve Plate

Compression Slot

De-compression Orifice

Hardened Running Surface

PVK-140 RH Valve Plate

RH Valve Plate

PVK-140 RH & LH Valve Plates

LH - CCW RH - CW

Note: Compression slots point in the opposite direction of pump rotation.

PVK “P-1NN” Control

OP 1 OP 2

OP 3 OP 4

OP 6

OP 7

OP 14

GPA

RP1“A” Port

“B” Port

PVK Control Specifications

SPECIFICATIONS PVK-140 PVK-270 PVK-370Control Minimum Pilot Pressure (psi) Volume Control Control piston stroke (inches) Control piston areas (inches²) Pressure Controls On Stroke Off Stroke Volume Controls On & Off are equal Volume (in³) Pressure Controls On Stroke Off Stroke

5001.21

0.4052.436

2.436

0.492.95

5001.62

0.6013.693

3.693

0.975.98

5001.62

0.6013.693

3.693

0.975.98

Volume Controls On & Off are equal Swashblock angle (degrees) max. Rate (msec.) at 1800 Rpm & rated pressure* On stroke Off stroke

2.9517

10070

5.9815

11070

5.9815

11070

*Fastest possible times. When using “Pressure Controls”, stroking times may be slower….depending on conditions. Consult Oilgear Technical Sales Department.

PVK Do’s and Don’ts

• The Do’s List– Check Alignment (.005 TIR)

– Fill the pump case!– Verify shaft rotation.– Connect case drain line directly back to

tank with no restrictions, full sized and separately.

PVK Do’s and Don’ts

• The Do List– Use a fast acting spike relief valve.– Back off the compensator and relief

valve adjustments prior to initial start-up.

PVK Do’s and Don’ts

• The Don’t List or the “If it breaks, you bought it list.”

–Do not restrict the case drain line.• No filters (if one is used make sure it

is sized for peak case flows and install a 5 psi check valve in parallel.)

PVK Do’s and Don’ts

• Case Restriction cont.– No in-line (Hedland style) flow meters, they

tend to be quite restrictive, the flow path through the meter is only a ½” inch diameter hole. If using one please, install a ball valve in parallel with the meter. Keep the ball valve open when you are not monitoring case flow.

PVK Do’s and Don’ts

• Case Restrictions cont.– No heat exchangers. –What does a heat exchanger need to

operate properly?

PVK Do’s and Don’ts

• Case Restrictions cont.– No heat exchangers.

• What does a heat exchanger need to operate properly.

• Answer: Turbulent Flow or pressure drop. Turbulent flow scrubs cold oil off the tubes and mixes it with hot oil, thus creating cooler oil.

PVK Do’s and Don’ts

• Case Restriction cont.– No other return or drain lines.

• Whew, thought we’d never get through case restrictions, didn’t ya.

• Inlet– No inlet strainers or filters.

PVK Do’s and Don’ts

• Inlet cont.– Strainers and filters can cause

cavitation. This is especially true as temperature and viscosity change.

• What is cavitation?

PVK Do’s and Don’ts

• Cavitation: Creating a low enough pressure to allow gasses normally in solution, to become free state. On the inlet of a pump this “free state gas (air)”, creates a bubble. When the bubble re-compresses (on pressure side of the pump) it implodes. This implosion generates temperatures in excess of 2300º F.

The Effects of Case Restriction

• Will cause the piston shoes to lift off the swashblock.– Maximum differential pressure for a PVK pump varies depending

on rpm. It can be as high as 10 psi at 1800.

• Vickers PVH 7 psi• Rexroth AA10VSO 7 psi• Oilgear PVWH 10 psi• Oilgear PVG 60 psi @1800 rpm• Oilgear PVM 10 psi

PVK Case Differential vs Inlet Curves

The Effects of Case Restriction

30 PSI on Inlet, 0 PSI on Case

0 PSI on Inlet, 30 PSI on Case

The Start of a bad thing

PVK-140 swashblock

The Final Stage

Thank you for buying Oilgear Products