Hydraulic piston pump additional features completed by the safety valve and check valve. When the pressure relief valve to avoid excessive increases fuel line blockage, caused by pipeline rupture or hydraulic piston pump damage occurred. The purpose of the one-way valve is set, when the fuel pump to stop working in the oil seal, so that the fuel system to maintain a certain residual pressure to the engine easier to start the next. Hydraulic piston pump is the main pump oil can be divided according electric petrol pump to their different structures and flat roller blade. The most common roller hydraulic piston pump. Hydraulic piston pump is installed in the vehicle fuel tank mounted on the outside and the fuel tank outside. There are a few models in the fuel tank, outside of the installation of an hydraulic piston pump, both series in oil on the road.In modern cars used in a variety of fuel injection system, fuel supply means they are different, but must be safe with an hydraulic piston pump. Its main task is to supply enough fuel system and there is a certain pressure fuel. Due to the mechanical petrol dispenser pump diaphragm by structural constraints, installation location away from heat both fixed-line and also can not be tapped installed. The hydraulic piston pump location can be arbitrarily chosen, and have no air resistance characteristics.
Normally the gas transfer pump ballast valve are arranged, it can refer to the manual mechanical vacuum pump oil seal technology. This gas transfer pump is easy to return oil and fuel injection, in order to overcome these shortcomings, the manufacturer at the same time with the molecular sieve, oil mist collector, dust filtration and oil filter and other accessories.With the operation and the manual fuel transfer pump oil circulating gas transfer pump, in return for high vacuum end will re evaporated into steam. Will affect the Portable fuel pump performance, increase the gas transfer pump. Set the gas ballast valve can effectively prevent the condensation of condensable gases, namely the pump in the compression process, gas ballast valve through the gas hole of the permanent dry gas mixed with compressed gas, condensable gas partial pressure in the pump when the temperature reaches the saturation vapor pressure, pressure of compressed gas can reach exhaust pressure, exhaust valve is opened, the condensate and dry gas discharged simultaneously. The auxiliary exhaust valve to work, whereby part of the gas is discharged, and the remaining gas is electronic diesel fuel pump by a low level of vacuum. Gas transfer pump when the inlet pressure is reduced, the auxiliary exhaust valve displacement will be reduced, ultimately closed.
Air is sucked into the common faults of external gear pump, following the first volume of the air sucked into this fault exclusion method : Pump with stainless steel end caps on both sides of the external gear pump in direct contact with a hard seal, if the flatness of the contact surfaces do not meet requirements, the work of the manual fuel transfer pump when air is sucked into the easily; Similarly, the pump and the pressure cap also for direct contact between the cover, the air is easily invade into; If the gland is plastic products, due to its damage or deformation due to temperature changes, but also make Mifengbuyan enter the air. Exclude this failure is: when the flatness dispenser fuel pump of the external gear pump or pump cover less than the specified time, you can press shaped route from grinding on the plate with emery also be on the surface grinder grinding to flatness of not more than petrol dispenser pump, and the need to ensure that the vertical plane of the hole which requires; leakage and the gland to the external gear pump at the head, can be coated with an adhesive such as epoxy resin for sealing.External gear pump shaft seal skeleton generally used for sealing. If the garter spring off the lip, or the anti-oil package, or lips were strained, aging, will make the seal often in a negative state backend sucked into the air, and can be replaced with new seals to be addressed.