Vickers V vs VQ Series: Which Replacement Vane Pump Do You Need?

An Eaton Vickers V or VQ series vane pump is the most common single-stage hydraulic pump on plastic injection molding machines, shoe-making machines, die-casting machines, and metallurgical equipment, and the V vs VQ decision is the replacement specification that determines whether a 20,000-30,000 hour service life pump delivers its rated performance or fails prematurely. The V and VQ series share the same cartridge kit architecture, the same shaft diameter, the same mounting flange, and the same overall envelope, but the VQ series is the higher-pressure evolution with reinforced cam ring, higher-strength port plate, and tighter internal clearances. The replacement buyer's framework is the comparison of displacement, maximum continuous pressure, noise emission, service life, oil cleanliness requirement, and price premium, with the application-specific recommendation being the V series for low-pressure continuous duty and the VQ series for high-pressure continuous duty or noise-sensitive applications. This 2026 replacement guide draws on the in-house product engineering data from VICKS Intelligent Equipment's V/VQ series replacement catalog, the 20V/25V/35V/45V single-stage vane pump product line, and the VICKS engineering and quality system background, and the published reference data from the Bosch Rexroth hydraulic pump catalog, the International Electrotechnical Commission (IEC) standards for industrial hydraulic equipment safety, and the European standards body on fluid power systems and pneumatic power systems.

VICKS Vickers V/VQ series single-stage replacement vane pump — 20V/25V/35V/45V frame sizes for plastic injection, shoe-making, die-casting, and metallurgical equipment. Photo: VICKS Intelligent Equipment.

1. Why the V vs VQ Decision Is the First Specification in a Replacement Pump RFQ

The V vs VQ decision is the first specification in a replacement pump RFQ, and it is the decision that determines the pump's continuous pressure rating, the noise emission level, the service life expectation, and the price benchmark for the RFQ. The decision is also the decision that determines whether the buyer can re-use the existing mounting hardware and shaft, or whether the buyer needs to re-engineer the mounting and the coupling. The replacement decision is most cost-effective when the buyer chooses the same frame size in the opposite series (V to VQ or VQ to V), because the shaft and the mounting flange are identical between the two series in the same frame size.

The V series was launched by Vickers in the 1960s as the first-generation high-performance vane pump, and it became the de facto standard for plastic injection molding machines, shoe-making machines, and die-casting machines over the following decades. The VQ series was launched in the 1990s as the higher-pressure evolution, with a reinforced cam ring, a higher-strength port plate, and tighter internal clearances that together deliver 20-30% higher continuous pressure rating and 2-4 dB(A) lower noise emission. The VQ series retains the same shaft diameter, the same mounting flange, the same port size, and the same overall envelope as the V series in the same frame size, which is the design decision that makes the V to VQ cartridge kit upgrade possible as a field-replaceable unit.

The replacement specification is typically written by the buyer's procurement team or the buyer's hydraulic engineering team, and it is typically reviewed by the pump supplier's application engineer before the quote is submitted. The specification should include the displacement (cc/rev), the continuous pressure rating (bar), the maximum pressure rating (bar), the speed range (rpm), the noise emission level (dB(A)), the shaft type (keyed, splined, or tapered), the port size and thread type, the mounting flange standard (SAE, ISO, or DIN), and the oil cleanliness requirement. The specification is the document that drives the quote, the lead time, the price, and the warranty terms. The reference standards for the specification include ISO 4413 (hydraulic fluid power — general rules for systems), ISO 4391 (hydraulic fluid power — pumps, motors and integral transmissions — performance and test methods), and the Hydraulic Institute standards for positive displacement pumps.

2. What Each Series Builds: Architecture, Pressure, and Noise Comparison

The V and VQ series share the cartridge kit architecture, which is the field-replaceable unit that contains the rotor, the vanes, the cam ring, and the port plate. The cartridge kit is the part that wears during the rated duty cycle, and it is the part that is replaced when the pump reaches the end of its service life. The cartridge kit is identical between the V and VQ series in the same frame size in terms of the shaft engagement and the mounting interface, but the VQ cartridge kit has a reinforced cam ring (with thicker walls and higher-strength material), a higher-strength port plate (with thicker walls and improved port geometry), and tighter internal clearances (with 5-10% tighter tolerances on the rotor-to-cam-ring gap and the vane-to-slot gap).

The continuous pressure rating is the most important specification difference between the V and VQ series, with the V series rated to 175 bar (2,500 psi) and the VQ series rated to 210 bar (3,000 psi) in the same frame size. The maximum pressure rating is 210 bar (3,000 psi) for the V series and 250 bar (3,600 psi) for the VQ series in the same frame size. The pressure rating difference reflects the higher stress levels in the cam ring and the port plate, which are the components that experience the highest cyclic load. The VQ series is the preferred choice for high-pressure continuous-duty applications, such as plastic injection molding machines with clamping forces above 250 tons, die-casting machines with high injection pressures, and metallurgical equipment with high-pressure hydraulic circuits.

The noise emission is the second most important specification difference, with the V series rated at 68-72 dB(A) at rated speed and the VQ series rated at 64-68 dB(A) at rated speed in the same frame size. The 2-4 dB(A) difference is achieved through the tighter internal clearances (which reduce the vane-to-slot impact noise), the higher-strength port plate (which reduces the port plate vibration noise), and the optional low-noise port plate geometry (which reduces the pressure ripple noise). The VQ series is the preferred choice for noise-sensitive applications, such as plastic injection molding machines in residential areas, shoe-making machines in workshop environments, and metallurgical equipment in enclosed factory buildings.

3. Cartridge Kit Upgrade: The Field-Replaceable Path from V to VQ

The cartridge kit upgrade is the field-replaceable path from V to VQ, and it is the path that delivers the VQ series performance to an existing V series pump without replacing the complete pump assembly. The upgrade consists of the VQ cartridge kit (rotor, vanes, cam ring, port plate), the VQ rear cover, and the VQ nameplate, and the upgrade takes approximately 2-4 hours per pump with standard hand tools. The shaft and the mounting flange from the original V series pump are retained, which is the design decision that makes the upgrade field-replaceable.

The upgrade procedure is documented in the Eaton Vickers V/VQ series service manual, and the procedure includes the following steps: (1) drain the hydraulic oil from the pump and the reservoir, (2) remove the pump from the machine and place it on a clean workbench, (3) remove the rear cover and the old cartridge kit, (4) inspect the shaft and the mounting flange for wear and damage, (5) install the new VQ cartridge kit and the VQ rear cover, (6) reinstall the pump on the machine and refill the hydraulic oil, (7) bleed the air from the pump and the circuit, and (8) run the pump at low pressure (below 50 bar) for 30 minutes to verify the alignment and the noise emission. The upgrade is the most cost-effective way to extend the service life of an existing V series pump, and the upgrade is typically performed by the buyer's maintenance team or by the pump supplier's service team.

The cartridge kit upgrade is priced at $400-$600 per kit in 2026, which is approximately 60-70% of the cost of a new VQ series pump. The upgrade delivers the full VQ series performance (210 bar continuous pressure, 64-68 dB(A) noise, 25,000-30,000 hours service life) at a 30-40% lower cost than a new VQ series pump. The upgrade is the preferred choice for buyers who have a fleet of V series pumps and who want to standardize on the VQ series performance without replacing all pumps at once. The upgrade is also the preferred choice for buyers who want to extend the service life of an existing V series pump without re-engineering the mounting or the coupling.

4. Frame Size Selection by Application: Plastic Injection, Shoe-Making, Die-Casting, Metallurgy

The frame size selection is the second specification in the replacement pump RFQ, and it is the specification that determines the displacement, the maximum flow rate, the shaft load, and the mounting envelope. The frame size is selected based on the application's displacement requirement (cc/rev) and the maximum continuous pressure requirement (bar), with the rule of thumb being that the displacement should be sized for the application's average flow demand at the rated speed, and the maximum continuous pressure should be sized for the application's peak pressure demand with a 10-20% safety margin.

For a plastic injection molding machine, the frame size is selected based on the clamping force, with the V20 or VQ20 (60 cc/rev) for 50-90 ton clamping force, the V25 or VQ25 (90-100 cc/rev) for 90-250 ton clamping force, the V35 or VQ35 (140 cc/rev) for 250-500 ton clamping force, the V45 or VQ45 (180 cc/rev) for 500-1,000 ton clamping force, and the 3525V or 3525VQ (108 cc/rev double pump) for very high tonnage or fast cycle time applications. The double pump delivers two flow rates in a single pump housing, with the front pump and the rear pump driven by the same shaft, and the double pump is the preferred choice for applications that require both high flow at low pressure (for the mold clamping and the plastic injection) and low flow at high pressure (for the holding pressure and the plastic melting).

For a shoe-making machine, the frame size is typically the V25 or VQ25 (90-100 cc/rev) for the main hydraulic pump, with the V20 or VQ20 (60 cc/rev) as the auxiliary pump for the mold clamping and the insole pressing. For a die-casting machine, the frame size is typically the V35 or VQ35 (140 cc/rev) for the main hydraulic pump, with the V25 or VQ25 (90-100 cc/rev) as the auxiliary pump for the injection cylinder and the clamping cylinder. For metallurgical equipment, the frame size is typically the V45 or VQ45 (180 cc/rev) or the 3525V or 3525VQ (108 cc/rev double pump) for the main hydraulic pump, with the V35 or VQ35 (140 cc/rev) as the auxiliary pump for the auxiliary functions. The frame size selection is the specification that should be reviewed by the pump supplier's engineering team before the RFQ is finalized.

5. Oil Cleanliness, Service Life, and Replacement Cycle

Oil cleanliness is the single most important factor in the V and VQ series service life, and it is the factor that determines whether the pump delivers the rated 20,000-30,000 hour service life or fails prematurely at 10,000-15,000 hours. The oil cleanliness requirement is ISO 4406 18/16/13 as the minimum for the rated service life, with NAS 1638 Class 7 or better. The oil cleanliness is achieved through a 10-micron absolute filter with a beta ratio of β₁₀ ≥ 100, with the filter typically located on the return line and on the pressure line (for the high-pressure circuit). The oil cleanliness is monitored through periodic oil analysis (every 1,000-2,000 hours or quarterly), with the analysis measuring the particle count, the water content, and the viscosity.

The oil temperature is the second most important factor in the service life, with the optimal temperature range being 30-60 °C for ISO VG 46 mineral oil at 30-50 cSt. The oil temperature above 70 °C accelerates the oil oxidation and the vane wear, and the oil temperature below 20 °C increases the oil viscosity and the pump load. The oil temperature is controlled through a heat exchanger (water-cooled or air-cooled) on the reservoir, with the heat exchanger sized for the pump's continuous-duty heat generation. The oil temperature sensor and the high-temperature alarm are typically installed on the reservoir, with the alarm set point at 65-70 °C for the standard industrial duty and 55-60 °C for the high-temperature duty.

The replacement cycle for a V or VQ series pump in a standard industrial duty (plastic injection molding machine running 2 shifts at 175 bar for V or 210 bar for VQ) is typically 6-8 years for the complete pump and 4-6 years for the cartridge kit. The replacement cycle is shorter in high-pressure continuous-duty applications (above 175 bar for V, above 210 bar for VQ) and longer in low-pressure intermittent-duty applications (below 100 bar). The replacement cycle is also affected by the oil cleanliness and the oil temperature, with a pump running at ISO 4406 19/17/14 and 60 °C achieving only 70-80% of the rated service life. The replacement cycle is the specification that drives the spare parts inventory, the maintenance budget, and the planned downtime schedule.

6. Price Benchmark and Total Cost of Ownership

The price benchmark for the V and VQ series in 2026 is approximately $650-$850 for the V25 single pump and $950-$1,200 for the VQ25 single pump, with the price scaling linearly with the displacement and the frame size. The price for the V35 single pump is $850-$1,100 and the VQ35 single pump is $1,200-$1,500. The price for the V45 single pump is $1,100-$1,400 and the VQ45 single pump is $1,500-$1,800. The price for the 3525V double pump is $1,400-$1,800 and the 3525VQ double pump is $1,800-$2,400. The price is the FOB China price for the OEM equivalent, with the OEM price typically 40-60% of the OEM-branded price for the same frame size.

The total cost of ownership (TCO) over a 10-year horizon is the comparison between the V series and the VQ series, with the VQ series typically delivering a lower TCO despite the higher initial price. The TCO calculation includes the initial purchase price, the cartridge kit replacement cost (typically 1-2 replacements over 10 years), the energy cost (the pump's mechanical efficiency is 88-92% for the V series and 90-94% for the VQ series), and the downtime cost (the VQ series has 20-30% longer service life and therefore 1-2 fewer unplanned downtime events over 10 years). The TCO calculation is the specification that should be performed by the buyer's procurement team before the RFQ is finalized, and the calculation should be based on the buyer's specific operating profile (shifts per day, hours per shift, duty cycle, oil cost, and downtime cost per hour). The TCO comparison is the specification that typically drives the decision to upgrade from V to VQ for existing pumps and to specify VQ for new installations.

V vs VQ TCO Worked Example (25 Frame, 10-Year Horizon, 2 Shifts)

For a V25 single pump running 2 shifts (4,000 hours/year) at 175 bar continuous pressure, the 10-year TCO is approximately $11,200, broken down as follows: initial purchase $750 (7 %), cartridge kit replacement at year 5 and year 8 at $500 per kit = $1,000 (9 %), energy at 90 % mechanical efficiency × 4 kW absorbed × 4,000 h × 10 years × $0.10/kWh = $17,800 (the energy cost dominates), maintenance labor 10 years × 8 hours/year × $50/hour = $4,000 (36 %), and unplanned downtime 2 events × 8 hours × $200/hour = $3,200 (29 %). The 10-year TCO is dominated by the energy cost (which scales with the mechanical efficiency), the maintenance labor cost, and the unplanned downtime cost. The V series TCO is calculated at $26,750 over 10 years.

For a VQ25 single pump running 2 shifts (4,000 hours/year) at 210 bar continuous pressure, the 10-year TCO is approximately $11,400, broken down as follows: initial purchase $1,075 (8 %), cartridge kit replacement at year 6 and year 10 at $600 per kit = $1,200 (9 %), energy at 92 % mechanical efficiency × 4 kW absorbed × 4,000 h × 10 years × $0.10/kWh = $17,400 (the energy cost dominates with the higher mechanical efficiency), maintenance labor 10 years × 6 hours/year × $50/hour = $3,000 (26 %), and unplanned downtime 1 event × 8 hours × $200/hour = $1,600 (14 %). The VQ series TCO is calculated at $24,275 over 10 years.

The VQ series TCO is approximately $2,475 lower than the V series over 10 years, driven by the higher mechanical efficiency (which saves approximately $400 in energy cost), the longer cartridge kit life (which saves approximately $200 in replacement cost), the lower maintenance labor cost (which saves approximately $1,000), and the lower unplanned downtime cost (which saves approximately $1,600). The VQ series is the preferred choice for high-duty-cycle applications where the downtime cost is significant, and the V series is the preferred choice for low-duty-cycle applications where the initial purchase price is the dominant variable. The TCO calculation is the framework that VICKS's engineering team uses for replacement pump recommendations, and the TCO model is delivered to the buyer as part of the OEM RFQ response.

7. Selection Flowchart: Which Series Fits Your Application?

The selection flowchart is the one-page summary that the buyer's procurement team can use to resolve the V vs VQ decision for a specific application, and it is the flowchart that VICKS's application engineer uses when delivering replacement pump recommendations. The flowchart is the framework that should be referenced before any V or VQ pump is specified, and it is the framework that should drive the OEM RFQ.

1. Step 1: Identify the application's continuous pressure requirement. If the continuous pressure is below 150 bar, the V series is the standard choice. If the continuous pressure is 150-175 bar, the V series is the standard choice with the VQ series as the upgrade. If the continuous pressure is 175-210 bar, the VQ series is the standard choice. If the continuous pressure is above 210 bar, the VQ series is the standard choice with the 3525VQ double pump as the upgrade.
2. Step 2: Identify the application's noise requirement. If the application is in a residential area or a noise-sensitive workshop, the VQ series is the preferred choice (2-4 dB(A) lower noise). If the application is in a standard industrial factory, either series is acceptable, with the V series as the lower-cost option.
3. Step 3: Identify the application's service life expectation. If the service life expectation is below 15,000 hours (5 years at 2 shifts), either series is acceptable. If the service life expectation is 15,000-25,000 hours, the VQ series is the preferred choice. If the service life expectation is above 25,000 hours, the VQ series is the standard choice with the cartridge kit replacement planned at 15,000-20,000 hours.
4. Step 4: Identify the existing mounting hardware. If the existing pump is a V series and the mounting hardware (shaft, flange, coupling) is in good condition, the cartridge kit upgrade from V to VQ is the most cost-effective option. If the existing pump is a VQ series and the mounting hardware is in good condition, the cartridge kit replacement is the standard maintenance.
5. Step 5: Identify the oil cleanliness status. If the hydraulic system is maintained at ISO 4406 18/16/13 or better, either series delivers the rated service life. If the hydraulic system is at ISO 4406 19/17/14 or worse, the V series is the preferred choice because the higher internal clearances of the V series are more tolerant of the higher particle count.
6. Step 6: Validate the total cost of ownership. For a high-duty-cycle application (above 5,000 hours/year) where the downtime cost is significant, the VQ series delivers a lower 10-year TCO despite the higher initial price. For a low-duty-cycle application (below 3,000 hours/year) where the downtime cost is minimal, the V series delivers a lower 10-year TCO because of the lower initial price.
7. Step 7: Request a custom OEM replacement quote. Submit the application's pressure requirement, displacement requirement, shaft type, mounting flange, and oil cleanliness status to the VICKS OEM engineering service. The OEM engineering service delivers a custom V vs VQ replacement recommendation within 5 business days, with the frame size, the cartridge kit upgrade or the complete pump replacement, and the 10-year TCO model spelled out for the buyer's specific scenario.

The selection flowchart is the framework VICKS's application engineering team uses for replacement pump recommendations. For an OEM replacement pump RFQ, the OEM engineering service starts with Step 1 and walks the buyer through the 7 steps to arrive at the recommended V or VQ series frame size, the cartridge kit upgrade or the complete pump replacement, and the 10-year TCO model. The OEM engineering service is part of every VICKS replacement pump project, and the OEM RFQ can be submitted through the website contact form. For a buyer who wants to see the full V and VQ series product range before submitting the RFQ, the VICKS V/VQ replacement series page is the starting point, and the 20V/25V/35V/45V single-stage pump product page is the specification reference.

8. Frequently Asked Questions

What is the main difference between Eaton Vickers V and VQ vane pumps?

The Eaton Vickers V series and VQ series vane pumps share the same cartridge kit architecture, but the VQ series is the higher-pressure evolution with reinforced cam ring, higher-strength port plate, and tighter internal clearances. The V series is rated to 175 bar (2,500 psi) continuous pressure, while the VQ series is rated to 210 bar (3,000 psi) continuous pressure in the same frame size. The VQ series also offers a higher displacement per frame size, with the VQ25 reaching 100 cc/rev versus the V25 at 90 cc/rev, and lower noise emission by 2-4 dB(A) at rated speed.

Are Vickers V and VQ vane pumps dimensionally interchangeable?

Yes, the Vickers V and VQ vane pumps are dimensionally interchangeable in the same frame size, with the same shaft diameter, mounting flange, port size, and overall envelope. The cartridge kit (rotor, vanes, cam ring, port plate) is the field-replaceable unit, and a V series pump can be upgraded to VQ performance by replacing the cartridge kit and the rear cover. The shaft and the mounting flange do not need to be replaced. The drop-in replacement makes the VQ series the preferred replacement choice when an existing V series pump reaches the end of its service life and the buyer wants to upgrade to higher pressure and lower noise without re-engineering the mounting.

Which frame size should a buyer choose for a plastic injection molding machine?

For a plastic injection molding machine with a clamping force of 90-250 tons, the Vickers 25V or 25VQ (100 cc/rev displacement) is the standard choice for the main hydraulic pump, with the 35V or 35VQ (140 cc/rev) as the upgrade for higher-tonnage machines or faster cycle times. For a clamping force of 250-500 tons, the 35V or 35VQ (140 cc/rev) is the standard, with the 45V or 45VQ (180 cc/rev) as the upgrade. For a clamping force of 500-1,000 tons, the 45V or 45VQ (180 cc/rev) is the standard, with the 3525V or 3525VQ (108 cc/rev double pump) as the upgrade for very high tonnage.

What is the typical service life of a Vickers V or VQ vane pump?

The typical service life of a Vickers V or VQ vane pump is 20,000-30,000 operating hours under standard industrial duty (ISO VG 46 mineral oil at 50 °C, continuous pressure at rated speed), with the cartridge kit typically requiring replacement at 15,000-20,000 hours. The service life is shorter in high-pressure continuous-duty applications (above 175 bar for V series, above 210 bar for VQ series) and longer in low-pressure intermittent-duty applications (below 100 bar). The service life is also affected by oil cleanliness, with ISO 4406 18/16/13 or better required for the rated service life. The replacement cycle for a plastic injection molding machine running 2 shifts is typically 6-8 years for the complete pump and 4-6 years for the cartridge kit.

Can a VQ cartridge kit be used to upgrade an older V series pump?

Yes, a VQ cartridge kit can be used to upgrade an older V series pump in most frame sizes, with the upgrade being a field-replaceable unit that takes approximately 2-4 hours per pump. The upgrade includes the VQ cartridge kit (rotor, vanes, cam ring, port plate), the VQ rear cover, and the VQ nameplate. The shaft and the mounting flange from the original V series pump are retained. The upgrade delivers 25-35% higher continuous pressure rating, 2-4 dB(A) lower noise, and 20-30% longer service life. The upgrade is the most cost-effective way to extend the service life of an existing V series pump without replacing the complete pump assembly.

What oil cleanliness standard does a Vickers V or VQ vane pump require?

The Eaton Vickers V and VQ vane pumps require ISO 4406 18/16/13 oil cleanliness as the minimum for the rated service life, with NAS 1638 Class 7 or better. The oil cleanliness is the single most important factor in the pump's service life, and a pump running at NAS 1638 Class 9 typically achieves only 50-60% of the rated service life. The oil temperature should be maintained at 30-60 °C for optimal viscosity (ISO VG 46 mineral oil at 30-50 cSt), and the oil should be replaced every 4,000-6,000 operating hours or annually, whichever comes first. The oil filter should be rated to 10 microns absolute with a beta ratio of β₁₀ ≥ 100.

What is the price difference between a Vickers V and VQ vane pump in 2026?

In 2026, a Vickers V series single-stage vane pump is priced at approximately 60-75% of the VQ series equivalent in the same frame size. For example, a V25 single pump is priced at $650-$850, while a VQ25 single pump is priced at $950-$1,200. The price premium for the VQ series reflects the higher-pressure rating, the lower noise, and the longer service life. The cartridge kit upgrade from V to VQ is priced at $400-$600 per kit, which is the most cost-effective way to extend the service life of an existing V series pump. For a new installation, the VQ series is the recommended choice because the 20-30% price premium delivers 25-35% higher pressure, 2-4 dB(A) lower noise, and 20-30% longer service life.