When starting a hand-held diesel pump manually using a pull rope, the pressure relief valve must be pressed in advance
Thread Content
When starting a hand-held diesel pump manually using a pull rope, it is necessary to press the pressure reducing valve in advance. It is said online that pressing the pressure reducing valve opens the valves of the diesel engine, thereby reducing the resistance to movement. I don’t understand this; could someone explain it in simple terms? My understanding is as follows: imagine a suction cup that cannot be pulled off easily, but if one lifts one of its edges, it will fall off on its own
My understanding is that diesel engines don’t have spark plugs; the force generated at the start isn’t sufficient to meet the requirements of the compression stroke. So, the pressure relief valve is opened to relieve the compression in the cylinder, and once there’s enough inertia, the pressure relief valve is closed, allowing the engine to start