• Gravity type single pump: external high-level fuel tank for oil supply
• Pressure type single pump: supplying oil through pressure from the crankcase or external fuel tank
• Vacuum oil suction type: sucking lubricating oil from the bottom of the oil injector box

The top interface of the membrane regulator and piston regulator is subjected to the entry of high-pressure gas, causing the membrane/piston to deform towards the low-pressure side, pushing the top rod outward and contacting the unloading pressure fork on the intake valve. It uses mechanical means to forcibly open the intake valve, keeping the corresponding cylinder intake valve port fully open.