Hydraulic-control Check Valve (For left and right lifting, hinge, front wheel incline and traction frame side swing) 1. Check Valve 2. Piston 3. Valve Body 4. Screw Plug 5. Screw Plug 6. Check Valve Operation When operate the control valve, oil enters A 1 chamber from oil pump and check valve (6) is opened and oil flows to B 1 chamber. When the pressure is produced, oil pushes piston (2) from throttle E and opens the check valve (1). In such way, oil connects the B 2 chamber and A 2 chamber and flows to oil outlet.
Because he pressure variation between cylinder head end and cylinder head bottom is consistent with the switch of check valve (1), so the swing is occurred, however, because the damper of the throttle E, so the check valve (1) will not closed immediately even the pressure in A 1 chamber is lowered. 20-111