Hand operation of hand rod, so circuit to control the flow of oil to reach the direction of control.
Remarks：
1、Ready-made standard valve heart is 2B2, 3C2, 3C3, 3C4, 3C6, if the special specification, please contact our technical department.
2、3C3, 3C6 intermediate position of the maximum flow small, to allow back pressure is also small.
3、Back pressure is higher than 7MPa, please directly to the oil port in turn would fuel tank leakage.
4、Manual rod torque, as allowed back pressure to change.