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MDP Hydraulics
The shock-resistant pressure gauge for heavy machinery is a high-reliability and highly adaptable pressure monitoring instrument specially designed for the hydraulic systems of heavy mobile equipment such as construction machinery, mining equipment, agricultural machinery, and ship deck machinery. These types of equipment operate under extremely harsh conditions, often accompanied by intense mechanical vibrations, continuous pressure pulsations, dusty and humid environments, and significant temperature fluctuations. Standard pressure gauges are prone to pointer jitter, difficult reading, increased wear on the mechanism, seal failure, and even damage in such environments. This product effectively suppresses the interference of vibration and shock on measurement through internal oil filling, strengthened mechanism structure, special shock absorption design, and sturdy sealing, ensuring stable, clear, and accurate pressure readings throughout the entire lifecycle of the equipment. It is a key monitoring component for ensuring the safe, efficient operation of heavy equipment hydraulic systems and achieving preventive maintenance.
This table is based on the Bourdon Tube or diaphragm sensing principle, converting pressure into mechanical displacement, and then amplifying it through a connecting rod and gear mechanism to drive the pointer to indicate the pressure value on the scale. Its "抗震" feature is mainly achieved through the following core design：
Internal liquid filling design (liquid damping): The inner cavity of the watch case is filled with high-viscosity silicone oil or glycerin. This liquid wraps around the moving parts of the movement, effectively absorbing and buffering high-frequency vibrations and pressure pulsation impacts from the outside, enabling the hands to stabilize quickly and eliminating shaking. At the same time, the liquid can lubricate the movement, prevent rust, and prevent internal condensation.
Rigid movement: Utilizes a widened shaft diameter, reinforced gears and gemstone bearings to enhance the rigidity and wear resistance of the transmission system.
Buffering device: Elastic damping elements are installed at the connection points or key areas to further isolate the transmission of vibrations.
Anti-screw-pin design: Optimizes the gap between the pointer, the dial and the mirror surface to prevent friction or jamming from occurring during intense vibration.
Fully sealed structure: Utilizing rubber sealing rings or O-rings, combined with a sturdy case (such as stainless steel or black steel), it achieves an IP65 or higher protection level, preventing dust, water, and oil contamination from entering.
Safety pressure relief cover: Some models are equipped with a safety cover with a pressure release hole. In case of unexpected internal overpressure (such as when filling with liquid and it expands due to heat), it can safely release the pressure to prevent the case from bursting.
The internal liquid damping is the core advantage, which ensures that the pointer remains clear and stable even during continuous and high-intensity operations of equipment such as excavators, loaders, and impact hammers. There are no blurred readings, significantly enhancing the accuracy and operability of the monitoring.
To meet the requirements of different heavy equipment hydraulic systems, extremely flexible range options are provided, typically covering a wide range from low pressure to ultra-high pressure, for example:
Low pressure range: 0 - 1.6 MPa, 0 - 2.5 MPa, 0 - 4 MPa (for pilot control and lubrication system)
Medium and high pressure range: 0 - 10 MPa, 0 - 16 MPa, 0 - 25 MPa, 0 - 40 MPa (used for the main working systems, such as the arm and bucket cylinders)
Ultra-high pressure and vacuum/composite range: Customizable according to specific equipment (such as hydraulic bolt tensioners, large presses).
Sturdy and durable: The casing is made of die-cast aluminum or stainless steel, and the surface is coated with anti-corrosion paint, making it resistant to corrosion and impact.
Clear dial: High-contrast white background with black text or reflective dial, accompanied by luminous hands and markings, ensuring that the readings can be easily understood even in dimly lit driver's cabins, at night, or in outdoor conditions.
Wide temperature range operation: The designed liquid-filled and sealed materials can operate stably within a temperature range of -20°C to +80°C, and even in a wider range of environmental temperatures.
Multiple process connection interfaces (such as G1/2″, M20 * 1.5, 1/4″NPT) are provided, which can be directly installed on valve blocks, pressure measurement connectors, or pipelines. Due to the seismic design, internal wear is significantly reduced, and its Mean Time Between Failures (MTBF) is much longer than that of ordinary pressure gauges. The maintenance requirements are extremely low, and the lifespan is significantly extended.
Product Outline Drawing:
Product Specifications:
Product Features:
Pressure gauge YN refers to pressure gauges that can function normally in harsh environments such as vibration and shock. Based on their structure and function, pressure gauge YN is mainly divided into two categories: mechanical vibration-resistant pressure gauges and electronic vibration-resistant pressure gauges.
Product Advantages：
1. Accuracy Level: The accuracy level of pressure gauge YN should comply with the national standard GB/T1226-2017 "General Pressure Gauges".
2. Vibration Resistance: Pressure gauge YN should have good vibration resistance and be able to operate normally in harsh environments such as vibrations and shocks.
3. Environmental Adaptability: The liquid-filled pressure gauge YN should have good environmental adaptability and be able to work normally under changing environmental factors such as temperature and humidity.
4. Electrical Performance: The electrical performance of the electronic liquid-filled pressure gauge should meet the industry standard JB/T8249-1996 "Electronic Liquid-Filled Pressure Gauges", including stability of output signals and anti-interference capabilities.
Testing Methods:
The testing methods for pressure gauge YN mainly include appearance inspection, accuracy testing, vibration resistance testing, environmental adaptability testing, and electrical performance testing.
To ensure the normal operation and lifespan of the shock-resistant pressure gauge YN, users should pay attention to the following points during use:
1. Choose the appropriate model and specification to meet the requirements of actual working pressure and usage environment.
2. Regularly conduct appearance inspections and performance tests, and address any issues promptly.
3. Avoid using in harsh environments such as high temperatures, high humidity, and strong magnetic fields.
4. Avoid severe vibrations and shocks to prevent damage to the instrument.
Construction machinery: Main pump outlets of excavators, loaders, bulldozers, cranes, and rollers, as well as the pilot systems and pressure monitoring of each actuator circuits.
Mining machinery: Rock drilling trolley, mining trucks, hydraulic systems of crushers.
Agricultural machinery: Hydraulic lifting and steering systems for tractors and harvesters.
Ships and port machinery: Deck machinery (rudder gear, anchor gear), hydraulic power units of port cranes.
Industrial field: Pressure monitoring in environments with strong vibrations such as large hydraulic machines, metallurgical equipment, and vibration test benches.
Correct selection is the key to achieving its full performance:
When selecting the range, ensure that the normal operating pressure of the equipment is within the range of 1/3 to 2/3 of the full scale. For example, if the system's normal pressure is 20 MPa, you can choose a range of 0-40 MPa or 0-60 MPa. Do not keep the pressure at the full scale for a long time.
Measure the thread specification and installation direction (radial or axial) of the installation position. Ensure that it perfectly matches the interface of the new meter.
Determine the vibration intensity, environmental temperature, and whether there are corrosive media (such as seawater spray), in order to select the appropriate protection level and housing material (for example, stainless steel is chosen for coastal areas).
Consider readability requirements: Select a dial with an appropriate diameter based on the installation location and viewing distance.
Use the appropriate wrench to tighten the hexagonal part of the pressure interface. Do not rotate the case directly. The installation position should be convenient for observation and should be avoided from excessive heat, direct water spray or excessive mechanical stress.
After starting the equipment, there may be significant fluctuations in pressure. This is a normal phenomenon. The shock-resistant design will cause the pointer to stabilize quickly. Pay attention to checking if the pressure is within the normal range.
Clean the dial glass with a damp cloth regularly to keep it clear.
Check for any leaks or damages in the case and its connections.
If the internal filling liquid becomes cloudy or bubbles form due to long-term use, it may affect the stability of the readings. In such cases, it is advisable to have it maintained or replaced by professionals.
It is strictly prohibited to disassemble the instrument under pressure or attempt to replace the filling fluid by yourself.
The shock-resistant pressure gauges for heavy machinery (with optional range) are not merely a display tool; they are the "health monitor" and safety sentinel of the hydraulic system of the equipment. Their value lies in converting the unreadable data under harsh working conditions into stable and reliable information, helping the operators to grasp the system status in real time and assisting the maintenance personnel in quickly diagnosing faults. Through its outstanding shock resistance, wide range of selectable options and extremely long service life, it effectively reduces misjudgments, maintenance costs and downtime risks caused by instrument failure, providing a solid guarantee for the high availability, high safety and efficient operation of heavy equipment, and is a low-cost and high-return investment for maximizing the value of the equipment.
