okimec SQP Series Vane Pump | SQP4 SQP21 Double Pump Replacement

The SQP Series industrial high-pressure, low-noise intravane pumps manufactured by Chengyuan Hydraulic are high-efficiency fluid power units fully compatible with Tokimec (Tokyo Keiki) industrial standards. Widely recognized as the benchmark power house for injection molding machines, die-casting rigs, and precision machine tools, this series covers single configurations (SQP1 through SQP4) as well as multi-stage double pump matrices (such as SQP21, SQP31, and SQP43). For primary design codes like the heavy single pumps SQP4-50-86B-18, SQP4-35-86C-18, and the dual-circuit SQP21-14-8-1DC2-18, we utilize standard modular cartridge kit technology. Every SQP pump undergoes 100% simulated load testing for volumetric retention and pressure ripple suppression under full rated loads to guarantee original-matching performance and deliver proven 100% original-place interchangeability.

Technical Specifications :

• Core Product Series: Tokimec SQP Series Intravane Hydraulic Pumps (Single / Double)

• Model Configurations Supported: SQP4-50-86B-18 / SQP4-35-86C-18 / SQP21-14-8-1DC2-18

• Displacement Code Breakdown:

  • SQP4 Single Frame (Code 35): 110.0 $cm^3/rev$

  • SQP4 Single Frame (Code 50): 156.0 $cm^3/rev$

  • SQP21 Double Frame (Shaft-end pump code 14: 45.0 $cm^3/rev$ / Cover-end pump code 8: 26.0 $cm^3/rev$)

• Maximum Continuous Operating Pressure: 17.2 MPa (172 bar / 2500 psi)

• Permissible Speed Velocity Range: 600 – 1800 rpm

• Volumetric Efficiency Index: $\ge 92\%$ (at maximum rated pressure and 1200 rpm)

• Drive Shaft Configurations: Code 1 denotes standard straight keyed shaft / Code 86 denotes high-torque options (splined or special keyed per spec)

• Port Orientation Layout Coding: Codes like B, C, or C2 identify flexible $90^\circ$ or $180^\circ$ radial angles between the main suction port and independent delivery outlets

• Fluid Media Designator: Code 18 specifies standard anti-wear industrial petroleum oils; also compatible with water-glycol or phosphate ester fire-resistant fluids when fitted with designated seal compounds

Key Technical Advantages:

• Intravane Mechanical Balance Topology: The vane slots feature a specialized dual-vane “intravane” layout that vectors pressurized fluid beneath the tracking tips. This automatically counters the radial hydraulic loads acting against the cam ring profile during rotation. This equilibrium minimizes mechanical wear on the stator ring, providing an extended operating envelope under continuous 17.2 MPa cycles.

• Whisper-Quiet Industrial Acoustical Blueprint: The cam ring profiles are CNC-ground matching optimized fluid-dynamic geometry, smoothing out the acceleration curve of the tracking vanes. Combined with shock-absorbing micro-metering slots, the pump subdues transient pressure ripples and cavitation noise, logging a quiet operating sound index of only 62 – 70 dB(A).

• Rapid-Service Replacement Cartridge Architecture: Internal rotating groups (stator ring, rotor, vanes, and side plates) are nested into self-contained drop-in cartridge assemblies. If contaminant erosion occurs, maintenance crews can extract and slide in a fresh replacement cartridge without removing the entire pump shell from the machine base, slashing manufacturing downtime.

• High-Versatility Double Pump Circuits: The SQP21-14-8 configuration houses two independent vane cartridges spinning on a unified drive axis. This structure allows independent or combined dual-flow outputs, matching high-flow approach states and high-pressure holding cycles on hydraulic clamping cylinders for optimal energy conservation.

Application Areas:

• Plastics Injection Molding & Heavy Die-Casting: Main hydraulic pressure source governing mold clamping and high-speed multi-stage injection rams.

• Heavy Forging Metal-Stamping Presses: Providing stable, low-ripple pilot pressure or main-stage actuation for industrial cutting and bending tools.

• Footwear & Leather Processing Rigs: Industry-standard hydraulic configuration for clicking presses and heavy-duty stamping machinery.

Expert Maintenance Tips:

• Mandatory Pre-Fill Priming Protocol: Upon initial system installation, the pump casing must be pre-filled with clean hydraulic fluid through the highest output port. Turn the prime mover over using short “jog” impulses. Never start the pump completely dry, as the lack of pilot tracking pressure under instantaneous full RPM can break the un-cushioned intravane tips against the cam ring.

• Verify Precise Rotation Coding: Always cross-reference the rotation mark stamped on the main casing tag (CW for Clockwise or CCW for Counter-clockwise as viewed from the shaft end). Reversing the layout forces the suction channel to compress fluid against the seals, blowing out the shaft lip seal instantly.

• Fluid Viscosity & Temperature Redlines: The precision tracking interfaces demand premium anti-wear petroleum media. Keep operating temps bounded between $15^\circ C$ and $65^\circ C$. If oil temperature spikes and viscosity drops below $20 \text{ cSt}$, the vane tips can score the stator profile, generating fine metallic debris.