hydraulic pressure gauge

5 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

3 year

Product details

2 gauges+2 cables+24 joints 3 gauges+3 cables+24 joints digital gauge

5 gauges 3 tubes 11 joints 10 T-joint 3 gauges 3 tubes 11 joints 12 T-joint 3 gauges 3 tubes 9 joints

14 T-joints and 20 joints Four in one measuring joint for breaker Distribution valve pressure plug set

1. Product Definition and Function

Ahydraulic silicon oil pressure gaugeis a specialized pressure measurement instrument designed for hydraulic systems. It uses silicon oil as a damping medium to effectively buffer hydraulic shocks and vibrations, ensuring stable pressure readings. Its core functions include:

• Real-time monitoring of hydraulic system pressure: Displays pressure values in key components such as excavator hydraulic arms, swing motors, and travel drives.

• System safety protection: Prevents hydraulic component damage by alerting to abnormal pressures (overpressure or underpressure).

• Fault diagnosis: Assists in identifying issues like hydraulic leaks, blockages, or pump failures.

Applicable Scenarios:

• Real-time pressure monitoring in high-pressure areas of excavators (e.g., hydraulic arms, rotary motors).

• Hydraulic system calibration during engineering machinery maintenance.

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2. Structure and Working Principle

2.1 Structural Components

1. Gauge Head (Housing):

• Material: Stainless steel (304/316L) or engineering plastic for corrosion resistance and impact resistance.

• Protection Rating: IP65 (dustproof and waterproof) for harsh outdoor environments.

2. Sensor (Sensitive Element):

• Type: Bellows or Bourdon tube (commonly copper alloy or stainless steel).

• Function: Converts hydraulic pressure into mechanical displacement.

3. Silicon Oil Filling Layer:

• Properties: High viscosity, chemical stability, and wide temperature range (-50°C to +200°C).

• Advantages: More heat-resistant than glycerin or air damping, with minimal volatility.

4. Pointer and Dial:

• Range: 0–600 bar (adjustable based on excavator model; common range: 0–400 bar).

• Units: bar, MPa, psi (customizable).

5. Connection Interface:

• Thread Specifications: G1/4, G1/2, M16×1.5 (compatible with international hydraulic fittings).

• Connection Types: Straight-through or bottom-mounted for flexible installation.

2.2 Working Principle

1. Hydraulic oil enters the gauge through the interface, applying pressure to the sensor (e.g., Bourdon tube).

2. The sensor deforms elastically, driving the pointer to rotate.

3. The silicon oil layer dampens vibrations, stabilizing the pointer.

4. The pointer indicates the corresponding pressure value on the dial.

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3. Key Performance Parameters

【表格】

Parameter Typical Value/Range Description

Measurement Range 0–400 bar (customizable) Covers common excavator hydraulic pressures.

Accuracy ±1.5% FS (full scale) Meets ISO 5167 standards.

Overpressure Capacity 1.5× rated pressure (transient) Prevents damage from accidental overpressure.

Operating Temperature -40°C to +120°C Suitable for extreme cold or hot environments.

Response Time ≤0.5 seconds (stable reading) Quickly reflects pressure changes.

Vibration Resistance Complies with ISO 16750-3 (5g vibration) Withstands construction machinery vibrations.

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4. Selection Guide

4.1 Define Measurement Requirements

• Pressure Range: Select based on the excavator’s maximum hydraulic pressure (e.g., 200–300 bar for small machines, 400–600 bar for large ones).

• Accuracy: Choose ±1.5% FS for maintenance or ±0.5% FS for precision control (requires digital sensors).

• Display Type:

• Mechanical analog: Low cost, high reliability.

• Digital LCD: With data storage and alarm functions (for smart monitoring systems).

4.2 Interface and Installation

• Connection Type:

• Straight-through: For direct pipeline installation.

• Bottom-mounted: Saves space in compact hydraulic compartments.

• Mounting Orientation: Vertical (gauge head upward) to prevent silicon oil leakage; horizontal installations require additional dampers.

4.3 Environmental Adaptability

• Corrosion Resistance: Use 316L stainless steel for coastal or chemical plant environments.

• Explosion-Proof: Select Ex dIIB T4 models for mining excavators.

• Low-Temperature Start: Choose heated silicon oil gauges for arctic regions (prevents oil freezing).

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5. Installation and Maintenance

5.1 Installation Steps

1. Pipeline Preparation: Ensure hydraulic lines are clean and debris-free.

2. Interface Sealing: Use PTFE tape or metal gaskets to prevent leaks.

3. Vertical Calibration: Tap the gauge housing lightly after installation to zero the pointer (analog models).

4. Power-On Test(Digital Models): Verify readings against a standard pressure source.

5.2 Routine Maintenance

• Periodic Calibration: Every 6 months; replace if errors exceed tolerances.

• Silicon Oil Replenishment: If pointer oscillation worsens, check for leaks and refill as needed.

• Dial Cleaning: Wipe with a soft cloth; avoid organic solvents (may damage markings).

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6. Common Faults and Solutions

【表格】

Symptom Possible Causes Solutions

Zero Offset Sensor fatigue, silicon oil leak Replace gauge or refill silicon oil.

Fluctuating Readings Excessive hydraulic pulses, low oil viscosity Add an accumulator or use higher-viscosity oil.

Gauge Head Leakage Aged seals, housing cracks Replace seals or housing.

Digital Display Error Sensor failure, circuit board moisture Return for repair or replace digital module.

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7. Alternative Solutions Comparison

【表格】

Type Advantages Disadvantages

Mechanical Silicon Oil Gauge Low cost, vibration-resistant, no power required Lower accuracy, no data storage.

Digital Pressure Gauge High precision, alarms, and logging Expensive, requires battery calibration.

Wireless Pressure Sensor Real-time remote monitoring, smart management Network-dependent, high initial cost.

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8. Application Cases

• Caterpillar 336D Excavator: Installed with a 400 bar silicon oil gauge at the main pump outlet to monitor output stability.

• Komatsu PC200-8 Maintenance: Used to detect internal leaks in the swing motor by measuring pressure.

• Polar Research Vehicle: Equipped with -50°C low-temperature silicon oil gauges for arctic hydraulic systems.

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Summary: Excavator hydraulic silicon oil pressure gauges are critical for ensuring hydraulic system safety. Selection should consider pressure range, accuracy, environmental adaptability, and installation. Proper maintenance and usage significantly extend lifespan and reduce failure rates.

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This translation maintains technical accuracy while adapting terminology for international engineering standards. Let me know if you need further refinements!