https://www.myoilpress.com/news/introduction-of-automatic-cottonseed-oil-expeller-machine.html
Cottonseed oil expeller machine consists of three parts: 1. Main engine. 2 hydraulic system. 3. Electrical control system
1) Hydraulic system adopts a new unloading circuit of high and low pressure double pump. It consists of high and low pressure combined double pump, high pressure manual rotary valve, high pressure relief valve, medium and low pressure relief valve, hydraulic control one-way valve, shock-resistant electric contact pressure gauge, etc. It has the characteristics of compact structure, convenient operation, universal spare parts, low energy consumption, safety and reliability.
2) Working principle of hydraulic system
Start: motor start, high and low pressure double pump output hydraulic oil through high pressure rotary valve 4 return tank.
Pre-pressure; high-pressure rotary valve to the right, high and low pressure hydraulic oil of double pump through high-pressure reversing valve into the upper chamber of the squeezing cylinder, from the beginning of work. Pre-pressing.