PVP3336R2H21 Parker PVP33 Piston Pump 33cc 248bar

Product Overview

The PVP3336R2H21 is a Parker Hannifin PVP Series size 33 open-circuit variable displacement axial piston pump with a nominal displacement of 33 cm³/rev (2.0 in³/rev), rated continuous working pressure of 248 bar (3600 psi), peak pressure of 310 bar (31 MPa), maximum speed of 3000 rpm, recommended speed range of 1200–1800 rpm, output flow of 59.0 L/min (15.6 GPM) at 1800 rpm, maximum drive power of 27.2 kW (36.5 hp) at 1800 rpm and 248 bar, and weight of approximately 20.4 kg. The pump employs a swashplate-type axial piston variable mechanism with standard built-in pressure compensation constant pressure control (no remote pressure adjustment port), automatically reducing displacement to maintain system pressure when load reaches the set point, delivering significant energy savings and low heat generation.

The PVP Series is Parker’s economical open-circuit variable piston pump platform for medium-pressure general industrial hydraulic systems, covering displacements from 16 to 140 cm³/rev with 250 bar rated continuous pressure, 350 bar peak pressure, and standard speed range of 1800–3000 rpm. The series features a high-strength cast iron housing, built-in supercharger, high-speed capability (3000 rpm), two-piece design for ease of field service, cartridge-style controls for rapid field replacement, replaceable bronze port plate and piston slipper plate, air bleed valve for quick priming, and hydrodynamic cylinder barrel bearing — with support for water-glycol fluids at rated pressure.

The PVP3336R2H21 model code decodes as follows: “PVP” represents the Parker economy open-loop variable piston pump series; “33” denotes nominal displacement of 33 cc/rev; “36” is the pressure rating code with pressure adjustment range 17–248 bar (3600 psi), continuous working pressure 248 bar, peak 310 bar; “9” specifies BSPP British Standard Pipe Thread side flange ports; “R” indicates rotation direction (clockwise right rotation, viewed from shaft end); “2” specifies displacement limiter option (with maximum displacement adjustable limit screw); “2” specifies through-shaft drive specification (SAE A flange, 3/4″ flat key through-shaft, allowing series connection of double pumps or gear pumps); “1” is the basic design version number (factory internal code, does not affect installation interchangeability).

The PVP3336R2H21 features SAE-B two-bolt mounting flange, 7/8″ keyed shaft, and port layouts conforming to Parker PVP33 Series standards, enabling drop-in interchangeability with same-frame PVP16, PVP23, PVP41 products. The pump is widely deployed in machine tools, die-casting machines, hydraulic power units, injection molding machines, marine and agricultural machinery hydraulic systems. The PVP Series is cross-referenced and cross-interchanged with Bosch Rexroth A10VO series and Eaton PVH series in market applications, with PVP pumps offering significant cost-performance advantages where stable flow, compact size, and continuous duty are required.

Every PVP3336R2H21 undergoes 100% simulated duty-cycle testing prior to shipment — covering pressure holding, flow output, compensator response, and internal leakage — ensuring complete drop-in interchangeability with original Parker pumps without installation or plumbing modifications.

Technical Specifications

PVP3336R2H21 Main Model Specifications:

• Model: PVP3336R2H21

• Brand: Parker Hannifin

• Series: PVP Series size 33

• Pump Type: Open-circuit swashplate axial variable piston pump

• Nominal Displacement: 33 cm³/rev (2.0 in³/rev)

• Rated Continuous Working Pressure: 248 bar (3600 psi / 24.8 MPa)

• Peak Pressure: 310 bar (31 MPa)

• Pressure Adjustment Range: 17–248 bar (3600 psi)

• Maximum Speed: 3000 rpm

• Recommended Speed Range: 1200–1800 rpm

• Minimum Speed: 600 rpm

• Flow at 1200 rpm (21 bar): 39.4 L/min (10.4 GPM)

• Flow at 1800 rpm (21 bar): 59.0 L/min (15.6 GPM)

• Maximum Drive Power at 248 bar (1800 rpm): 27.2 kW (36.5 hp)

• Control Type: Standard built-in pressure compensation constant pressure control (no remote pressure adjustment port)

• Direction of Rotation: R (clockwise, viewed from shaft end)

• Port Configuration: BSPP British Standard Pipe Thread side flange ports

• Mounting Flange: SAE B two-bolt flange

• Shaft Type: SAE B 7/8″ keyed shaft (22.22 mm)

• Displacement Limiter: With maximum displacement adjustable limit screw

• Through-Drive: Yes, SAE A flange, 3/4″ keyed through-shaft

• Seals: NBR (Nitrile, suitable for standard mineral hydraulic oil)

• Housing Material: High-strength cast iron

• Weight: Approx. 20.4 kg

• Fluid Cleanliness Requirement: ISO 16/13 to 18/15

• Optimum Viscosity Range: 17–180 cSt (max. start-up viscosity 1000 cSt)

• Operating Temperature Range: -40 to +71 ℃

• Mounting Mode: SAE B two-bolt flange mounting

• Case Drain Ports: 3× SAE-8 straight thread 3/4″-16UN

PVP Series Same-Family Displacement Reference (248 bar rated conditions):

• PVP16: 16 cm³/rev (0.98 in³/rev), flow at 1800 rpm 29.5 L/min (7.8 GPM), max drive power 13.1 kW (17.5 hp), max 3000 rpm, weight approx. 13.2 kg

• PVP23: 23 cm³/rev (1.4 in³/rev), flow at 1800 rpm 42.0 L/min (11.1 GPM), max drive power 19.7 kW (26.5 hp), max 3000 rpm, weight approx. 20.4 kg

• PVP33: 33 cm³/rev (2.0 in³/rev), flow at 1800 rpm 59.0 L/min (15.6 GPM), max drive power 27.2 kW (36.5 hp), max 3000 rpm, weight approx. 20.4 kg

• PVP41: 41 cm³/rev (2.5 in³/rev), flow at 1800 rpm 73.8 L/min (19.5 GPM), max drive power 33.2 kW (44.5 hp), max 2800 rpm, weight approx. 25 kg

• PVP48: 48 cm³/rev (2.9 in³/rev), flow at 1800 rpm 86.4 L/min (22.8 GPM), max drive power 40.3 kW (54.0 hp), max 2400 rpm, weight approx. 25 kg

• PVP60: 60 cm³/rev (3.66 in³/rev), flow at 1500 rpm 90 L/min, max drive power 41.7 kW, max 2200 rpm, weight approx. 41 kg

• PVP76: 76 cm³/rev (4.64 in³/rev), flow at 1500 rpm 114 L/min, max drive power 52.8 kW, max 2200 rpm, weight approx. 41 kg

• PVP100: 100 cm³/rev (6.10 in³/rev), flow at 1500 rpm 150 L/min, max drive power 69.5 kW, max 1800 rpm, weight approx. 82 kg

• PVP140: 140 cm³/rev (8.54 in³/rev), flow at 1500 rpm 210 L/min, max drive power 97.3 kW, max 1800 rpm, weight approx. 82 kg

Data based on Parker PVP Series official technical specifications.

PVP Series Control Options (Model Code Suffixes):

• No code: Standard built-in pressure compensation constant pressure control

• M: Internal control remote pressure adjustment

• ME: External control remote pressure adjustment

• A: Load sensing LS energy-saving control

• H: Constant power pressure-flow combined control

PVP Series Product Advantages:

• Full power through-shaft capability, rear tandem gear pump or piston pump for double pump configuration

• Two-piece housing design for ease of field service

• Cartridge-style controls for rapid field replacement

• Replaceable bronze port plate and piston slipper plate

• High-strength cast iron housing for reliable, quiet operation

• Optional inlet/outlet port locations for flexible installation

Key Technical Advantages

1. Standard Pressure Compensation Constant Pressure Control — Energy Savings and Low Heat

The PVP3336R2H21 features standard built-in pressure compensation constant pressure control (no remote pressure adjustment port), automatically reducing displacement to only leakage flow when system load reaches the set point for constant pressure holding. This control method offers simple construction and fast response, virtually eliminating relief losses during pressure-holding conditions for significant system heat and energy reduction. The pressure adjustment range is 17–248 bar, suitable for machine tool fixtures, die-casting machine holding, hydraulic power units, and other industrial hydraulic systems requiring extended constant-pressure holding. The pump also offers M (internal control remote pressure adjustment), ME (external control remote pressure adjustment), A (load sensing LS energy-saving control), and H (constant power pressure-flow combined control) options, meeting diverse requirements from simple constant pressure to complex load sensing control.

2. High-Speed Capability with Built-In Supercharger — Stable Operation at 3000 rpm

The PVP Series features a built-in supercharger with maximum speed of 3000 rpm and recommended operating speed range of 1200–1800 rpm. High-speed capability combined with compact structural design enables the pump to deliver flow output meeting industrial hydraulic system demands within limited installation space. At 1800 rpm, the PVP33 delivers 59.0 L/min output flow, with maximum drive power of 27.2 kW at 248 bar, with power density leading among comparable medium-pressure piston pumps. The built-in supercharger ensures adequate suction at high speeds to prevent cavitation damage.

3. Two-Piece Design and Cartridge Controls — Rapid Maintenance and Low Downtime

The PVP Series employs a two-piece housing design for ease of field disassembly and maintenance. Cartridge-style controls enable rapid field replacement without pump disassembly, significantly reducing equipment downtime. The replaceable bronze composite port plate and piston slipper plate design further reduces long-term maintenance costs. The pump housing features an air bleed valve for quick priming and venting, simplifying initial startup and post-repair commissioning. The hydrodynamic cylinder barrel bearing design effectively distributes loads and minimizes wear, extending overhaul intervals.

4. Full Power Through-Shaft Drive — Flexible Multi-Pump System Integration

The PVP3336R2H21 supports full power through-shaft drive with SAE A flange and 3/4″ flat key specification, enabling tandem installation of gear pumps or same-series piston pumps for double pump systems driven by a single prime mover. This design provides exceptional integration flexibility in multi-circuit hydraulic systems, reducing the number of independent power units and lowering piping complexity and installation costs. The SAE-B two-bolt mounting flange and standard keyed shaft ensure rapid drop-in interchangeability with original Parker PVP pumps.

5. Exceptional Media Compatibility and Wide Operating Range

The PVP Series supports water-glycol fluids at rated pressure, with NBR seals suitable for standard mineral hydraulic oil. The optimum viscosity range is 17–180 cSt with maximum start-up viscosity of 1000 cSt, and operating temperature range of -40 to +71 ℃. The wide viscosity and temperature ranges enable adaptation to various industrial hydraulic system operating conditions. The fluid cleanliness requirement is ISO 16/13 to 18/15, with moderate filtration accuracy requirements suitable for standard industrial hydraulic system maintenance conditions.

Application Areas

• Machine Tools and Tool Machines: CNC lathes, machining centers, and grinding machine clamping, feed, and tailstock drive hydraulic systems

• Die-Casting Machines: Shot and intensification system auxiliary hydraulic circuits, with standard pressure compensation control suitable for holding conditions

• Injection Molding Machines: Clamping, injection, and holding pressure auxiliary pump circuits

• Hydraulic Presses: Four-column and frame-type hydraulic press power sources

• Hydraulic Power Units: Fixed industrial hydraulic power units and non-standard equipment hydraulic power units

• Metallurgical Equipment: Rolling auxiliary equipment and metallurgical auxiliary hydraulic systems

• Marine and Offshore: Deck machinery and steering gear hydraulic systems

• Agricultural Machinery: Tractor hydraulic hitch and auxiliary hydraulic circuits

• Material Handling Equipment: Medium forklift and hydraulic lift platform power units

• Municipal Engineering Equipment: Sweeper and snow removal vehicle working device hydraulic systems

The PVP3336R2H21 is ideally suited for medium-pressure industrial hydraulic systems requiring 248 bar continuous working pressure and displacements in the 33 cm³/rev range — the classic configuration for machine tool hydraulic power units and die-casting machine auxiliary hydraulic circuits. In construction machinery, industrial hydraulic power units, and marine applications, the PVP3336R2H21 is commonly cross-referenced against Bosch Rexroth A10VO series and Eaton PVH series, with PVP pumps offering significant cost-performance advantages where stable flow, compact size, and continuous duty are required.

Expert Maintenance Tips

1. Shaft Alignment and Coupling Requirements

Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. The PVP3336R2H21 features an SAE-B two-bolt mounting flange and SAE B 7/8″ keyed shaft (22.22 mm) — never strike the shaft end during installation to avoid damaging internal seals and bearings. Tighten mounting flange bolts in diagonal sequence to the specified torque. Couplings must be equipped with protective guards. Motor-to-pump shaft alignment should be checked after installation and again after 500 hours of operation.

2. Pre-Start Priming Procedure (Mandatory)

Before initial startup, the pump must be slowly filled through the case drain port with clean hydraulic oil to ensure adequate lubrication, cooling, and sealing during startup. PVP pumps feature a standard air bleed valve for quick priming. Operating an axial piston pump dry — even for a few seconds — will score the swashplate, valve plate, and piston slippers, causing immediate total pressure loss and irreversible damage. Start the pump in jog mode until the pump and piping are sufficiently filled and vented. After complete venting, run at low pressure for 5–10 minutes, check piping and component tightness, then gradually increase to rated pressure.

3. Pressure Compensator Setting and Adjustment

The PVP3336R2H21 pressure compensator setting should be at least 10–15 bar below the system relief valve setting. The pressure adjustment range is 17–248 bar. During commissioning, first turn the pressure setting screw to the lowest pressure position, then gradually increase to the target pressure. Adjustment must be performed with the pump at full displacement and low operating pressure to avoid system pressure oscillation. In multi-pump systems, stagger the compensator settings to prevent simultaneous adjustment-induced pressure oscillation.

4. Fluid Cleanliness and Filtration

The PVP3336R2H21 requires fluid cleanliness of ISO 16/13 to 18/15. Use pressure line filters with a filtration ratio β10 ≥ 75 (per ISO 4572). Avoid suction filters, which increase suction resistance and cavitation risk; if essential, use with a vacuum switch monitor. Maximum pressure in filter and/or cooled drain lines is 7 bar (100 psi). Install a breather filter with filtration accuracy ≤10 μm on the reservoir and regularly check oil level and fluid condition. ISO VG32 or VG46 anti-wear hydraulic oil is recommended, with optimum viscosity range of 17–180 cSt.

5. Case Drain Line and Restart Procedure After Extended Shutdown

The case drain line should be independently routed to the reservoir, avoiding shared return lines. The PVP3336R2H21 case drain ports are 3× SAE-8 straight thread (3/4″-16UN). Case drain backpressure must not exceed permissible limits (max 7 bar), with drain line diameter sufficiently large to ensure free drainage under cold-start high-viscosity conditions. If the pump has been idle for more than 30 days, manually rotate the shaft several turns to verify free rotation before restarting. Check for abnormal leakage at the case drain port. After startup, operate at low pressure for 10–15 minutes until oil temperature reaches normal operating range before applying full load.