PC78US-6 dual-hole
5 day ago
Product details
PC78US-6 Dual-Hole Hydraulic Gear Pump: Comprehensive Technical Analysis (English Version)
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1. Core Definition & Structural Breakdown
• Model Definition
• PC78US-6: A specific brand/series identifier (actual displacement, pressure ratings, etc., require confirmation via supplier datasheets).
• Dual-Hole Design: Refers to a pump body withtwo independent suction/discharge ports, distinct from single-hole models. This structure enables bidirectional flow distribution or redundant hydraulic circuits, ideal for applications like double-acting cylinders or parallel-connected actuators.
• Technical Principle
• The gear pump converts mechanical energy into hydraulic energy through the meshing of a driving gear and a driven gear. The dual-hole design optimizes internal flow paths, allowing simultaneous oil intake/discharge from both sides of the gear chambers. This reduces localized pressure fluctuations and enhances volumetric efficiency.
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2. Key Performance Parameters (Hypothetical Examples – Actual Data Required)
【表格】
Parameter Example Value Technical Implications
Displacement 12.5 cc/rev Output volume per revolution, directly determining system flow rate (Q = Disp. × Speed × Eff.).
Rated Pressure 280 bar Safe operating pressure limit; must match system design to prevent leaks/failures.
Peak Pressure 315 bar Maximum instantaneous pressure for shock-loading scenarios (e.g., crane lifting).
Speed Range 600–3,000 rpm Must align with motor/engine specs; low speeds risk cavitation; high speeds accelerate gear wear.
Volumetric Efficiency ≥92% @ 2,000 rpm Reflects internal leakage; dual-hole design improves efficiency via optimized gear clearances and seals.
Noise Level ≤75 dB(A) @ 1,500 rpm Gear-mesh noise must comply with industrial standards; dual-hole design reduces pulsation-induced noise.
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3. Core Advantages of Dual-Hole Design
• Flow Distribution Flexibility
• Scenario 1: Double-acting hydraulic cylinders (e.g., excavator arm cylinders) require synchronized control of piston extension/retraction. Dual-hole pumps enable direct connection to both cylinder chambers, simplifying piping layouts.
• Scenario 2: Parallel-connected actuators (e.g., die-casting machine’s clamping and injection units) benefit from independent oil supply, avoiding flow losses from single-hole splitting.
• System Redundancy
• If one oil circuit fails (e.g., due to blockage or leakage), the other circuit can maintain partial functionality (e.g., redundant steering circuits in vehicles).
• Pressure Pulsation Suppression
• Compared to single-hole pumps, dual-hole designs alternate suction/discharge phases, balancing gear-mesh impacts and reducing pulsation amplitudes (e.g., single-hole pulsation ≥15%, dual-hole ≤8%).
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4. Typical Applications
• Construction Machinery
• Drive systems for excavator/loader travel motors (bidirectional flow control required).
• Rotary drive units for rotary drilling rigs (high torque at low speeds demands stable pressure).
• Industrial Equipment
• Plastic injection molding machines (multi-stage pressure switching requires precise flow allocation).
• Hydraulic power units for filter presses (synchronous advancement of twin cylinders).
• Agricultural Machinery
• Lifting systems for combine harvester headers and threshing drums (multi-actuator coordination).
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5. Selection & Maintenance Guidelines
• Key Selection Criteria
• Load Matching: Calculate system peak flow (Q = Disp. × Speed × Eff.) and pressure requirements to avoid oversizing or overloading.
• Fluid Compatibility: Confirm hydraulic oil viscosity range (e.g., ISO VG32–68), anti-wear properties, and cleanliness (NAS 1638 standard).
• Environmental Adaptability: High-temperature applications (e.g., steel mills) require high-temperature seals; cold starts necessitate preheating.
• Maintenance Best Practices
• Regular Inspections: Check oil cleanliness every 500 hours; replace filters every 2,000 hours.
• Fault Diagnosis:
• Insufficient Flow: Worn gears (clearance >0.1 mm requires replacement), clogged ports.
• Abnormal Noise: Damaged bearings (axial play >0.05 mm), misaligned couplings.
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6. Comparative Analysis (Single-Hole vs. Dual-Hole Pumps)
【表格】
Parameter Single-Hole Pump Dual-Hole Pump Selection Basis
Flow Control Requires external valve blocks for splitting Independent ports for direct allocation Dual-hole preferred for multi-actuator systems to simplify piping.
Pressure Stability Higher pulsation coefficient 30–50% lower pulsation Critical for high-precision control (e.g., CNC machines).
Cost Lower Higher (~+15% to +25%) Single-hole for budget-sensitive, simple applications.
Redundancy None Single-circuit failure protection Mandatory for safety-critical systems (e.g., marine steering).
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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3 year
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hydraulic motor,
gear box,
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