Oil cylinder manufacturer in Lifting valve Oil circuit description of ET-02: First, we need to know that the hydraulic oil on the lifting platform is fed through the oil inlet with O-ring behind the EF-02 lifting valve. When Hydraulic system Power on the lifting valve Cartridge valve When the power is off, the hydraulic oil enters from the oil inlet, one of which goes directly to the "overflow valve", passes through the "overflow valve", passes through the "throttle valve", and then returns the hydraulic oil to the oil tank through the oil return port. When the hydraulic system is energized and the cartridge valve on the lifting valve is not energized, the other way is through the one-way valve, then to the work port, and then to pump the hydraulic oil into the cylinder from the work port. When the hydraulic system is powered on and the cartridge valve on the lifting valve is powered on, all oil lines pass through the oil inlet - overflow valve - throttle valve - oil return port. The other way is through the oil inlet - check valve - working port - cartridge valve - oil return port. The cartridge valve on the lifting valve is mainly used to start the electric lowering. When the hydraulic system is not powered on and the cartridge valve on the lifting valve is not powered on, the hydraulic oil in the system will be maintained through the one-way valve and cartridge valve, so that the hydraulic oil in the cylinder will not return directly to the oil tank to ensure the safety of the system.