Hydraulic balance valve Excavator hydraulic cylinder valve core COHA-XAN

    Cartridge valve is another type of hydraulic control valve collectively. The basic core component is a liquid-controlled, single-control port two-way liquid resistance unit installed in the main stage of the oil circuit (so it is also called two-way cartridge valve).
Various control function units of the cartridge valve can be formed by combining one or several insertion elements with corresponding pilot control stages. Such as direction control function unit, pressure control unit, flow control unit, compound control function unit.
Cartridge valve has the following characteristics: small internal resistance, suitable for large flow; Most of the valve ports are sealed with cone, so the leakage is small, and the working medium such as emulsion is also suitable for simple structure, reliable work and high standardization; For large flow, high pressure, more complex hydraulic system can significantly reduce the size and weight.
Cartridge is a multifunctional composite, which consists of basic components such as spool, valve sleeve, spring and seal ring inserted into a specially designed and processed valve body. It is equivalent to A hydraulically controlled check valve with two working oil ports A and B) and one control oil port (X). Changing the pressure of the control oil port can control the opening and closing of the A and B oil ports. When the control port has no hydraulic action, the liquid pressure under the valve core exceeds
Spring force, the valve is pushed open, A and B are connected, and the direction of the liquid flow depends on the pressure of the A and B ports. On the contrary, the control port has A hydraulic effect, and when px≥pA and px≥pB, it can ensure the closure between port A and port B.
Cartridge valves can be divided into two categories according to the control oil: the first type is an externally controlled cartridge valve, the control oil is supplied by A separate power source, its pressure is unrelated to the pressure change of A and B ports, and it is mostly used for the direction control of the oil circuit; The second type is the internally controlled cartridge valve.
The two-way cartridge valve has the characteristics of large capacity, small pressure loss, suitable for large flow hydraulic system, short main spool stroke, sensitive action, strong anti-oil ability, simple structure, easy maintenance, plug-in has the characteristics of one valve multi-energy. Therefore, it is widely used in various hydraulic systems
In the system, such as excavators, cranes, truck cranes, ship machinery and so on.