The role of small fuel dispenser spill

For the analysis of the various parts of the small tanker, thereby enhancing the understanding of the small tanker. Introduced the case of a small tanker vane pumps and oil pumps, etc. It should be noted in a previous article. Works and analysis of fault diagnosis and now we look at the role of the relief valve in the pump its principal role.
Relief role is:
High pressure relief valve within the pump chamber of a door leading to the low pressure chamber, which is mainly from limiting the maximum pressure and protect the hydraulic system of the hydraulic system, and can regulate output retail fuel dispensers traffic.
Relief works:
When the motor is started, the oil pump, pressure oil flows from the pump pressurized area of ​​oil and gas separator and P relief valve opening time if open oil gun, pressure oil flows to oil separator, pressure relief valve is turned off, the pump The positive pressure and negative pressure zone area pass each other; when the oil gun is closed, the pressure in the hydraulic system of the rapid increase in oil pressure relief valve spring will overcome, the spool to the right, high-pressure oil through the relief valve P O ports and port flows to the pump suction area to achieve a circulating oil pump.
Increase the spring force can be increased up pressure in the hydraulic system. Without relief, when the hydraulic system pressure is higher than a certain value. System weak link in most book will be destroyed.
When the pressure relief valve adjustment screw clockwise twist, the pressure required to open the relief valve increases, most or all of the flow of oil and gas separator. The output portable fuel transfer pump traffic increases; when the adjusting screw counter-clockwise, the pressure required to open the relief valve is reduced, some oil through the relief valve back to the pump suction area, the external output flow decreases.