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

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?

–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?

–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 PVK-140PVK-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

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.

PVK Viscosity & Temperature Specifications

PVK-140 LH Valve Plate Control 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 1OP 2 OP 3OP 4 OP 6 OP 7 OP 14 GPA RP1 “A” Port “B” Port

PVK Control Specifications

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 Vickers PVH 7 psi Rexroth AA10VSO 7 psi Oilgear PVWH 10 psi Oilgear PVG 60 rpm Oilgear PVM10 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

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