Parker PV140 Axial Piston Pump | PV140R1K1T1NMM1 Variable Displacement

The PV140 Series axial piston variable displacement pumps manufactured by Chengyuan Hydraulic are heavy-duty fluid power generation modules fully engineered to match global Parker PV industrial standards. Tailored for high-pressure open-circuit hydraulic systems, this commercial-grade unit specifically aligns with the complete specification catalog code PV140R1K1T1NMM1. Delivering a robust volumetric displacement of $140\text{ cm}^3\text{/rev}$ at a continuous operating envelope of 350 bar, the configuration integrates right-hand clockwise rotation (R), a single standard shaft extension (1), an ISO-standard 4-bolt flange with a parallel keyed drive (K1), premium NBR elastomer seals (T1), and the critical NMM1 modular standard pressure compensator control mechanism. Every singular PV140 pump undergoes 100% simulated load testing for peak high-pressure limits, variable stroke response dead-band calibration, zero-position case leakage constraints, and continuous volumetric efficiency checks prior to shipment to guarantee genuine original-matching parameter tracking, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications :

• Core Product Framework: Parker PV Series Template Heavy-Duty Open-Circuit Axial Piston Variable Pumps

• Full Model Configuration: PV140R1K1T1NMM1

• Geometric Volumetric Displacement: 140 $cm^3/rev$

• Continuous Nominal Operating Pressure: 350 bar (35 MPa / 5075 psi)

• Intermittent Peak System Pressure Cap: Reaches up to 420 bar (42 MPa / 6090 psi)

• Maximum Self-Priming Speed (at 1 bar absolute inlet pressure): 2200 rpm

• Maximum Allowable Speed (with inlet boost / flooded suction): 2500 rpm

• Mounting Flange & Drive Shaft Specification (K1):

  • Mounting Interface: 4-bolt circular alignment matching ISO 3019-2 specs (180 mm pilot diameter)

  • Input Shaft Extension: Parallel cylindrical key shaft conforming to ISO standards (50 mm diameter)

• Main Fluid Process Ports:

  • Suction Intake Port: SAE 2½ standard high-pressure split-flange connection

  • Pressure Discharge Port: SAE 1¼ heavy-duty high-pressure flange split configuration (Code 62 / 6000 psi rating)

• Displacement Variable Control Type (NMM1): Standard Pressure Compensator (Pressure Cut-off mechanism), adjustable from 20 bar up to 350 bar.

• Elastomer Sealing Configuration (T1): Premium Nitrile (NBR) compounds, authorizing mineral-based fluid temperatures from -20°C to +80°C.

• Component Net Weight: Approximately 90 kg (198.4 lbs)

Key Technical Advantages:

• FEM-Optimized Shock-Absorbing Ductile Iron Housing: The main housing of the PV140 is cast from high-grade structural ductile iron utilizing finite element method (FEM) optimization. The thick-walled profile features integrated fluid-stabilizing internal galleries that prevent structural breathing or micro-stretching under a sustained 350 bar load. This design dampens mechanical vibration from the piston shoe assembly, keeping operational noise levels exceptionally low.

• Advanced Timing Plate with Integrated Pre-Compression Chambers: To mitigate fluid backflow spikes and sharp acoustic waves generated as the pistons cross from the low-pressure suction tract to the high-pressure discharge zone, the valve plate features sub-micron ground pre-compression blind holes and progressive fluid throttling grooves. This smooths pressure escalation steps and anchors total fluid sound emissions below 72 dB(A).

• 9-Piston Rigid Rotating Grid with Hydrostatically Balanced Shoes: The primary cylinder block drives 9 high-carbon alloy steel pistons fitted with hydrostatically balanced thrust slippers. Operating with a continuous 10-15 micron dynamic oil film separating the slippers from the swashplate face, the design prevents boundary dry-friction contact during high-frequency stroke changes, locking long-term volumetric efficiency above 94%.

• High-Response NMM1 Servo-Assisted Swashplate Control: The NMM1 control module features a high-sensitivity pilot spring cartridge. When downstream system resistance reaches the predetermined pressure cutoff threshold, internal pilot fluid shifts to drive the large servo piston, quickly forcing the swashplate to a minimum stroke position. This delivers a fast response time of $\le 80\text{ ms}$ for effective over-pressure protection and minimized power consumption.

Application Areas:

• Heavy Industrial Centralized HPUs: Main fluid power generation for heavy metal scrap balers, primary metallurgical sheet shears, and heavy-duty industrial die-casting machinery.

• Heavy Mobile & Engineering Equipment: Primary hydraulic circuit power drives for rotary crawler drilling rigs, heavy marine cargo winches, and auxiliary propulsion arrays on tunnel boring machines (TBM).

Expert Maintenance Tips:

• Mandatory Cavity Fluid Priming Prior to Prime Mover Activation: The rotating components and swashplate journal bearings of the PV140 depend entirely on the fluid pool within the pump housing for cooling and lubrication. You must fill the pump casing with clean, matching hydraulic oil via the highest drain port (typically G ¾ thread size) and index the shaft 3 to 5 times by hand before starting the motor. Never dry-start the pump; doing so will permanently score the cylinder block face and valve plate within the first 2 seconds of operation.

• Isolate Case Drain Line and Enforce Tight Backpressure Limits ($\le 2\text{ bar}$): The PV140R1K1T1NMM1 incorporates standard NBR shaft seals. The case drain line must feature an internal diameter of no less than 20 mm and must route directly back to the reservoir below the oil line, completely independent of main return blocks or check valves. Maintain a continuous internal housing pressure under 1.5 bar (2.0 bar peak transients). Excessive case pressure will flip or blow the shaft seal lip and delay variable servo piston stroke action.

• Enforce Rigorous Fluid Cleanliness Targets and Install High-Pressure Filtration: High-pressure axial piston blocks are highly sensitive to abrasive suspended particulates. The system fluid cleanliness must be continuously filtered to match or exceed ISO 4406 18/16/13 (NAS Class 7). It is highly recommended to position a high-pressure inline filter rated at $\beta_{10} \ge 200$ downstream of the pump discharge, preventing micro-particulate contamination from jamming the NMM1 pilot valve core and causing control drift or failure to stroke.