708-23-00921 RELIEF VALVE
Introduction to bulldozer safety valve 1. Definition Bulldozer safety valve is an automatic opening and closing pressure control valve installed in key circuits of hydraulic systems (such as working devices, steering, walking, etc.). When the system pressure exceeds the preset safety value, the valve automatically opens to relieve pressure; After the pressure returns to normal, the valve is closed to maintain the normal working pressure of the system. 2. Working principle The core principle of safety valves is based on "pressure force balance": The valve is equipped with a spring and a valve core, and the preload force of the spring corresponds to the safety pressure (preset value) of the system. When the system pressure is below the safe value, the valve core closes under the action of spring force, and hydraulic oil cannot pass through, and the system works normally. When the system pressure exceeds the safe value, the pushing force of hydraulic oil on the valve core is greater than the spring force, and the valve core is pushed open. Part of the hydraulic oil is discharged back to the oil tank through the safety valve (pressure relief), causing the system pressure to decrease. When the pressure drops below the safe value, the spring force pushes the valve core to close again, and the system returns to normal pressure The bulldozer safety valve is the core safety device of its hydraulic system, mainly used to prevent the system pressure from exceeding the specified value. When the pressure of the medium inside the equipment or pipeline rises and exceeds the set threshold, the safety valve will automatically open to reduce the pressure by discharging the medium outside the system, avoiding equipment damage or safety accidents caused by overpressure. Its structure usually includes key components such as valve body, valve core, and spring. The valve core achieves opening and closing control under the balance of spring force and system pressure, similar to the "spring valve core" driving principle of loader safety valves
Application of bulldozer safety valve
The hydraulic system of a bulldozer is the "power center" for its operation and walking, covering working devices (bulldozer, bulldozer), steering system, walking system, etc. Safety valves play a key protective role in these systems:
1. Working device hydraulic system (core application scenario)
The bulldozer's bulldozer blade (lifting, tilting) and loosening device (lifting, entering the soil) rely on hydraulic cylinders to drive, and during operation, sudden loads (such as the bulldozer blade encountering hard rocks or the loosening device getting stuck) can cause a sudden increase in pressure inside the cylinder.
The safety valve is installed in the oil inlet circuit of the oil cylinder. When the pressure exceeds the safety value (usually 1.1-1.2 times the rated pressure of the system), the valve opens to discharge some high-pressure oil back to the oil tank, avoiding deformation or bursting of the cylinder barrel and piston rod due to overload, and protecting the hydraulic pump that drives the oil cylinder (preventing pump damage due to overpressure).
Steering hydraulic system
Bulldozer steering relies on hydraulic cylinders (or hydraulic motors) to drive the differential speed of the tracks. If the tracks suddenly become obstructed during steering (such as getting stuck in mud or colliding with obstacles), the pressure in the steering oil circuit will instantly increase.
The safety valve in the steering circuit can quickly relieve pressure, preventing the steering cylinder, steering pump, or steering control valve from failing due to overpressure, ensuring the reliability of the steering system, and avoiding the risk of "stuck and out of control"
. Walking hydraulic system
Some bulldozers use hydraulic drive for walking (such as fully hydraulic bulldozers), and the walking motor drives the track to rotate through hydraulic oil. If the track is stuck by rocks or the load is too large when climbing, the pressure in the walking oil circuit will increase abnormally.
The safety valve of the walking circuit is now opened to relieve pressure, protecting the walking motor, hydraulic pump, and high-pressure pipeline to prevent motor gear cracking, pipeline bursting, and other faults caused by overload. The General Industrial Value of Safety Valves
Safety valves are widely used in fields such as boilers, pressure vessels, steam systems, etc., for example:
Steam system: installed downstream of pressure reducing valves, flash tanks, heat storage devices, and other equipment to prevent explosions caused by overpressure.
Special industry: The heat transfer oil boiler adopts A40 type safety valve to deal with high temperature oil and gas above 350 ℃, and the air compressor protects the safety of the gas collection tank through the safety valve. The core mechanism of "automatic overpressure relief pressure recovery closure" is a universal guarantee for the safe operation of industrial systems
The bulldozer safety valve is the "safety guard" of the hydraulic system, which prevents overload by accurately controlling pressure. Its application runs through core systems such as the working device, steering, and walking, and is a key component to ensure efficient and safe operation of bulldozers. In practical use, it is necessary to regularly check the pressure setting and sealing of the safety valve to ensure its sensitivity and reliability
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