Use and maintenance of the hottest gas pressure co

2022-08-06
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Use and maintenance of gas pressure controller

the gas pressure controller (see the attached figure) is a component used in the traveling braking system of construction machinery to control the service braking and maintain the air pressure at 0.70mpa to meet the requirements of service braking. If the air pressure of the pressure controller is less than 0.65 MPa, the friction plate cannot be in good contact with the brake disc during service braking, resulting in too long braking distance, reduced braking efficiency or failure; If the pressure is greater than 0.70 MPa, the friction plate will easily be locked with the brake disc and burned out, resulting in too short braking distance, serious tire wear, and even "emergency braking" during normal braking. In serious cases, the driver will be thrown out of the front window of the cab, causing major accidents. Therefore, the use and maintenance of the pressure controller must not be ignored. During operation, the air compressor driven by the engine discharges compressed air, enters the pressure controller through the air inlet hole a, pushes the air inlet check valve to the right, and enters the air chamber I and air chamber II. The compressed air enters the air reservoir through the air outlet hole B. the high-pressure gas in the reservoir is divided into two stages, and is led to the brake valve and barometer for braking. If the compressed air pressure in air chamber I is less than 0.07 MPa, the compressed air in air chamber II cannot push the valve drum upward, and the compressed air continuously inflates the air reservoir until the gas pressure reaches 0.07 MPa; If the compressed air in air chamber I pushes the valve drum upward (the drum spring and valve drum are adjusted by adjusting screws, and the pressure remains at 0.70 MPa), the compressed air in air chamber II enters air chamber III and air chamber IV through the gap between the valve drum and the vent valve, the high-pressure air in air chamber III pushes the cup and valve rod to the right, the valve rod pushes the air check valve to the right, and the left end of the valve rod leaves the vent hole seat, The high-pressure gas in chamber III and chamber IV is discharged from vent holes C and D through park, scope, chain and intensification. The air pressure in chamber III and chamber IV drops below 0.70 MPa, and then the vent check valve, valve rod and cup return to their original position under the action of the vent check valve spring. At the same time, the valve tympanic membrane is pushed back to its original position by the tympanic membrane spring, and the valve tympanic membrane is closely attached to the vent valve, and the gap disappears. When the air pressure in air chamber I and air chamber II drops to 0.70 MPa, the air compressor continues to inflate the air reservoir, and so on. In order to use safely, the working performance of the pressure controller shall be checked regularly: first, shut down the engine, continuously step down the brake pedal (or turn on the water inlet switch of the air receiver to discharge all the gas in the air receiver) until the barometer pointer is zero, close the water drain switch, and then start the engine and stabilize it at r/min to make the system air pressure reach 0.70 MPa. When the inflation continues, the compressed air will be discharged from the vent hole of the pressure controller. If the air pressure is lower than 0.65 MPa during exhaust, it indicates that the pressure of the air release valve is low. Screw the adjusting screw of the pressure controller into Xiao Xu. If the air pressure is higher than 0.70 MPa, it means that the air release valve pressure is too high, and the adjusting screw should be screwed out a little. If the system air pressure is continuously maintained at 0.70 MPa, it indicates that the pressure controller works normally. The pressure controller has been adjusted and sealed before leaving the factory. If there is no fault, do not disassemble it at will. The common faults, causes and troubleshooting methods of the pressure controller are as follows: 1. There is air leakage between the upper and lower shells, and there are bubbles after being coated with detergent water. The upper and lower shell castings are defective; The sealing ring between the upper and lower shells is damaged or the fastening bolt is loose; The valve tympanic membrane is aged, causing air leakage from the adjusting screw. With the rapid improvement of people's favor for LED lighting system in recent years, clean the shell surface and repair defects with metal repair agent; Replace the sealing ring or fastening bolt; Replace the valve drum. 2. The air pressure is less than 0.65 MPa and keeps decreasing, but the gas is always discharged from the vent D of the pressure controller. The valve tympanic membrane, tympanic membrane spring or vent valve are damaged, and the seal is invalid; Vent hole C is blocked; The air release check valve leaks; Failure due to loss of vent check valve spring; The leather cup is aged and leaks air. Check the valve tympanic membrane in order to prevent dust from entering the lens barrel or lens surface, the sealing condition of tympanic membrane spring or air release valve. If it is damaged, replace it with a new one and dredge the air release hole C; Replace the vent check valve; Replace the vent check valve spring; Replace the cup. 3. When the air pressure is lower than 0.65 MPa, the adjusting screw is too loose, the valve tympanic membrane air release pressure is low, and the air release valve is aging and leaks. Screw in the adjusting screw a little; Replace the vent valve. 4. The air pressure is normal, but air is constantly leaking from the pressure controller vent D or D. The valve tympanic membrane does not fit tightly with the vent valve, forming a gap and air leakage; The tympanic membrane spring is damaged and invalid, and cannot compress the valve tympanic membrane. Check the sealing condition of valve drum and vent valve, and replace with new parts if damaged; Replace the tympanic spring. 5. After the air compressor stops pumping, the vent hole D or C does not bleed, but the air pressure drops rapidly. Air leakage due to aging, damage and loose sealing of air inlet check valve; The inlet check valve spring is damaged and becomes invalid. Check the air inlet check valve and its sealing condition. If it is damaged, replace it with a new one; Replace the inlet check valve spring. 6. When the air pressure is higher than 0.70 MPa, the adjusting screw is too tight, the compression of the tympanic spring is too large, and the valve tympanic air release pressure is too high. Screw out the adjusting screw a little to reduce the compression of the tympanic spring. 7. The air pressure is higher than 0.70 MPa and keeps rising, but the air is not discharged from the vent hole D or C, and the tympanic spring is stuck; The air hole on the vent valve is blocked; The vent check valve spring is stuck; The valve rod is stuck. Replace the tympanic spring; Dredge the air hole on the air release valve; Replace the vent check valve spring; Repair or replace the valve rod. When maintaining the pressure controller, pay attention to keep all seals, joints and air inlets and outlets of the pressure controller clean to prevent dirt and impurities from entering and causing pipeline blockage or loose sealing. Its internal rubber valve and rubber material are replaced to prevent premature aging of rubber parts and affect safety. After maintenance, the working performance of the pressure controller shall be inspected and calibrated with an accurate pressure gauge. It can be used only after the adjustment is qualified

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