Precautions for selecting oil pressure of four-column hydraulic machine

(1) For all types of valves with a pressure of 20MPa, the control oil pressure shall not be lower than 0.35MPa.
(2) For all types of valves with a pressure of 31.5MPa, the control oil pressure shall not be lower than 1.0MPa.
(3) The electro-hydraulic reversing valve (such as M, H type, etc.) with the mid-position function of the spool valve that can unload the hydraulic pump should be placed on the oil return line of the main valve with a back pressure greater than the control oil pressure to ensure the reversing of the main valve. Action reliability, while controlling oil return should adopt external oil return method.
(4) The pilot control pressure of the electro-hydraulic directional valve shall comply with the application range in the product catalog. The use range of the pilot control pressure of the electro-hydraulic directional valve is based on the premise that the electro-hydraulic directional valve can work reliably. If it is less than the minimum pilot control pressure, the electro-hydraulic directional valve cannot work or cannot work reliably.
(5) Pay attention to whether the pressure of the control oil can meet the reversing requirements of the electro-hydraulic directional valve. For electro-hydraulic directional valves and hydraulic control directional valves with spool valve functions such as M, H, K, X, etc., if the control oil is provided by the main oil circuit, measures should be taken to ensure that the main oil circuit can maintain switching when the valve is in the middle position. to the required pressure.