Oil Filled Shock Resistant Pressure Gauge

Oil-filled shock-resistant pressure gauges are core pressure measurement instruments in the industrial field for dealing with vibration and shock environments. By filling the gauge case with damping oil (such as glycerin or silicone oil) and adopting a special structural design, they solve the problems of pointer jitter, inaccurate readings, and easy damage to components of ordinary pressure gauges under harsh working conditions. They are widely used in mechanical manufacturing, petrochemicals, hydropower, shipping, and other scenarios.

I. Core Working Principle
The core advantage lies in the synergistic effect of "damping oil buffering + sealed structure", with the specific principle as follows:
Pressure transmission basis: Similar to ordinary pressure gauges, it senses the pressure of the measured medium through elastic elements (such as spring tubes or diaphragms). After deformation, the elastic element drives the connecting rod and gear mechanism, ultimately rotating the pointer to display the pressure value.
Shock resistance core: The role of damping oil: The damping oil filled in the gauge case (commonly glycerin or silicone oil) has high viscosity characteristics and can:
Absorb external vibration / shock: When the instrument is subjected to mechanical vibration or sudden impact, the damping oil can absorb kinetic energy, reducing the violent shaking of the pointer and internal gears, and preventing the pointer from "sticking" or component wear.
Stabilize pointer readings: In scenarios with frequent pressure fluctuations (such as pump outlet), the damping oil can slow down the pointer's response speed, avoiding high-frequency pointer jitter and ensuring clear and distinguishable readings.
Sealing and protection: The gauge case adopts a fully sealed design (usually with a protection level of IP65/IP67), which not only prevents the leakage of damping oil but also isolates external dust and water vapor from entering, protecting the internal mechanism from corrosion.

II. Core Technical Parameters (Key for Selection)
When selecting, the following parameters should be focused on to ensure compatibility with actual working conditions:
Measurement range (Pressure Range):
Conventional range: Vacuum (-0.1MPa) to high pressure (such as 100MPa), which should be selected based on the actual measured pressure (it is recommended that the actual pressure be within 1/3 to 2/3 of the range to avoid overpressure damage).
Accuracy class (Accuracy Class):
Commonly used in industry are 1.0 class (error ≤ ±1% of the range) and 1.6 class (error ≤ ±1.6%); for precision scenarios (such as laboratories), 0.5 class is used.
Dial size (Dial Size):
Common specifications: Φ40mm (for small equipment embedded installation), Φ63mm/Φ100mm (for wall-mounted installation on pipelines, convenient for reading), Φ150mm (for long-distance reading).
Medium compatibility (Media Compatibility):
The elastic element + interface material should be compatible with the medium:
Ordinary gases / liquids (such as water, air): copper alloy (brass).
Corrosive media (such as acid and alkali solutions, seawater): 316 stainless steel.
High-temperature media (such as steam, temperature > 80℃): "High-temperature type" should be selected, with high-temperature damping oil and metal bellows.
Environmental adaptability (Environmental Rating):
Temperature range: Conventional type -20℃ to 60℃; low-temperature type -40℃ to 60℃ (using silicone oil); high-temperature type -20℃ to 100℃.
Protection level: IP65 (dustproof, resistant to water spray), IP67 (dustproof, short-term immersion), IP67 is preferred for outdoor or humid environments.
Shock / vibration resistance (Shock/Vibration Resistance):
Vibration tolerance: Usually ≥ 20Hz (amplitude 0.1mm) or ≥ 50Hz (amplitude 0.05mm).
Impact tolerance: ≥ 500m/s² (about 50g), some heavy-duty industrial models can reach 1000m/s².

III. Application Scenarios (Core Industrial Application Fields) The core value of oil-filled shock-resistant pressure gauges lies in their ability to "adapt to harsh working conditions". Typical applications include:
Mechanical manufacturing: Monitoring the pressure in the hydraulic systems of machine tools, stamping equipment, and hydraulic/pneumatic circuits of construction machinery (excavators, cranes), and resisting high-frequency vibrations during equipment operation.
Petroleum and chemical industry: Measuring the pressure in oil pipelines, reactors, and pump outlets, withstanding medium fluctuations and on-site mechanical vibrations, while also preventing oil and gas corrosion.
Hydropower / Nuclear power: Monitoring the pressure at the pump outlet, lubricating oil systems of steam turbines, and cooling water pipelines, adapting to the vibration and humid environment in power plant buildings.
Marine / Offshore engineering: Monitoring the pressure in the fuel lines of ship power systems (diesel engines) and oil pipelines on offshore platforms, withstanding the jolts and impacts during navigation and seawater corrosion.
Automotive industry: Testing the pressure in automotive braking systems and engine oil pressure (bench tests), resisting vibrations during engine operation.