Ports D2, E1, E2, SC2, G1, G2, M1 to be drilled on request. Port identified with D1 and SC1 are not protected with calibrated orifice but in direct connection with pressure channels.Description
The electro hydraulic check and metering E-valve for excavators prevents uncontrolled lowering of the actuator in case of hose failure and provides the load holding when the joystick is released in neutral position. Lifting operations are performed with very limited pressure losses across the valve. The valve includes also a pressure relief stage (1) which prevents any overloads into the cylinder.
The actuation of the valve is performed by energizing the electro-proportional pilot stage (2) whose setting and characteristic curve are determined by changing the electrical parameters. Based on the two stages opening principle (2, 3), the valve provides flow metering from the cylinder to the main control valve and offers the possibility to change the behavior of the machine only by adjusting the pilot stage parameters. For safety reasons, the valve is directly mounted on the cylinder flange and provides a compact installation with the elimination of the pilot piping and the positioning of all hydraulic ports on the back surface. The valve is also equipped with a by-pass function (4) which can be used for emergency boom lowering in case of power supply failure.
Series E-valve
Maximum operating pressure: 420 bar (6090 psi)
Max. flow: 500 l/min. (132 gpm)
