Company Overview

Roquet is a prominent Spanish manufacturer specializing in fluid power transmission with over 50 years of experience. It serves diverse sectors such as agriculture, naval, automotive, construction, mining, wind energy, and food industries. Operating four plants with 400 employees, Roquet produces annually large volumes of gear pumps, valve bodies, cylinders, and compact power packs. The company emphasizes in-house manufacturing of critical components and rigorous quality control, including 100% unit testing and advanced R&D facilities.

Product Description: PLA Gear Pumps

The PLA series features hydrostatically balanced gear pumps with automatic lateral adjustment, designed for hydraulic oils with anti-foam and extreme pressure additives. Recommended oil viscosity ranges from 3° to 8° E at 50°C, and fluid temperature tolerance is from -20°C to +80°C. Filtration is critical, with minimum recommended filtration of 125 µm on suction and 25 µm on return lines. Direct drive via elastic couplings is preferred to absorb vibrations, allowing minimal radial and axial movement (0.3–0.4 mm). Suction lines must be sized to maintain cavitation below 0.3 bar. Pumps support clockwise or counterclockwise rotation and multiple configurations (double, triple, quadruple) with interchangeable mounting flanges and shafts.

Connection and Port Specifications

Threaded port connections (type "R") use BSP standards: smaller pumps (24–36 cc/rev) have 3/4" BSP suction and 1/2" BSP pressure ports; larger pumps (44–56 cc/rev) have 1" BSP suction and 3/4" BSP pressure ports. Reversible pumps have identical suction and pressure ports on both sides matching suction port dimensions.

Coding System and Model Identification

Model codes specify pump type (single/multiple), flow rate at 1500 RPM at zero pressure, rotation direction (D=clockwise, I=counterclockwise, R=reversible), shaft form, pulley type, priority flow rating, relief valve pressure setting, valve variants, and flange connection types.

Hydraulic Technical Data

• Flow rates at 1500 RPM range from 24 to 84 L/min depending on displacement (24–56 cc/rev).
• Minimum RPM varies with pressure and pump size (500 to 3000 RPM).
• Maximum continuous pressure ratings are 100, 175, and 250 bar depending on model.
• Maximum RPM ranges from 2000 to 2800 RPM.
• Volumetric efficiency exceeds 90% at 1500 RPM across pressures up to 250 bar (tested with ISO VG 46 oil at 50°C).
• Performance charts assist in system design and power estimation.

Mechanical and Dimensional Details

Multiple front flange types (01, 09, 10, 19, 23) are available with detailed shaft forms, key dimensions, fit torques (11–12 mkg), and maximum driving torque (up to 120 Nm). Shaft diameters, key sizes, taper angles, and thread specifications are precisely defined. Reversible pumps feature symmetrical port dimensions with suction and pressure port inversion depending on rotation.

Installation and Operational Recommendations

• Use oils with recommended additives and viscosity to maximize pump and oil life.
• Maintain proper filtration to prevent contamination-related failures.
• Employ elastic couplings to reduce vibration transmission.
• Size suction lines to avoid cavitation (limit suction depression to 0.3 bar).
• Verify rotation direction before startup.
• Adhere to specified torque values for mounting screws and shaft fittings.

Summary of Critical Parameters

Assembly, Shaft, and Connection Specifications

• Multiple shaft forms (G, K, H, E, C, X) with detailed dimensions, including SAE flat base splines (16/32 diametral pitch, 30° pressure angle, 13 teeth).
• Connection types include threaded ports (BSP) with sizes M6, M8, M10, M12 and specific thread lengths.
• Rotation direction affects port inversion; clockwise rotation indicated by "D", counterclockwise by "I".

Pump Models and Dimensions

Various models are detailed with displacement volumes (8.55 to 9.65 cc/rev for single pumps, up to 66 cc/rev for double pumps), weights (up to ~200 kg for double pumps), and dimensional parameters. Examples include 1PLA36D, 1PLL36-36D, and others.

Torque and Power Ratings

• Fit torque for shaft assembly is 11–12 mkg.
• Maximum power absorption is 40 HP at 1500 RPM for double pump assemblies.
• Maximum driving torque for spline shafts is 120 Nm.

Assembly Components and Spare Parts

Comprehensive lists include pump housings, bearings, gears, compensation plates, seals (oil seals, O-rings, anti-extrusion gaskets), keys, circlips, screws, washers, nuts, elastic pins, flanges, couplings, and pulleys. Spare seal kits are identified by part numbers to facilitate maintenance.

Port and Flange Details

• Ports for suction and pressure include side and rear options with BSP thread sizes (3/8" and 3/4").
• Front flange types are specified with fixing dimensions.
• Leakage ports are provided for drainage.

Rotation and Port Inversion

Changing pump rotation from clockwise to counterclockwise requires inversion of suction and pressure ports to maintain correct hydraulic operation.

Additional Notes and Recommendations

• Additional port connection forms, including lateral ports, are available.
• Reference specific flange type pages for fixing dimensions.
• Various pulley and belt types are described for mechanical integration.

Hydraulic Pumps with Relief and Priority Flow Valves

Detailed specifications for pumps equipped with relief valves and priority flow valves include component descriptions, assembly details, pressure settings, and connection types.

Components and Parts

• Screws and fasteners: M12x1.5 screws, DIN washers, circlips, copper gaskets.
• Seals and rings: O-rings, oil seals, metal-buna bonded gaskets.
• Valve components: relief valve bodies, plugs, springs, heads, seat assemblies, priority flow valves.
• Flanges and supports for mounting.

Pump Models and Specifications

Pressure Settings and Valve Details

• Relief valve pressure settings range from 5 to 250 bar with specific components for different ranges.
• Valve components include springs, plugs, washers, heads, and seat assemblies with part numbers.
• Priority flow valves enable controlled flow distribution in some models.

Connection and Shaft Details

• Standard shaft form E with options for rotation direction.
• BSP threaded ports for suction and outlet with optional sizes.
• Side port connection form R specified for certain models.

Assembly and Maintenance Notes

• Screw fit torque specified at 11–12 mkg.
• Spare parts ordering examples with quantities and part numbers provided.
• Components designed for interchangeability within series.

Manufacturer's Disclaimer and Additional Information

PEDRO ROQUET, S.A. reserves the right to modify specifications without prior notice. For further details, consult the manufacturer’s website or authorized distributors.

Conclusion

The Roquet PLA gear pump series offers robust, reliable, and versatile hydraulic pumps suitable for a wide range of industrial and mobile applications. Their design prioritizes durability, ease of maintenance, and adaptability with multiple configurations and connection options. Strict quality control and extensive testing ensure high performance and long service life when installed and operated according to recommended guidelines.