Threaded cartridge valve SV08-30 Direction control valve DHF08S-230

Cartridge valve, also known as logic valve, is a new type of hydraulic component, which is characterized by large flow capacity, good sealing performance, sensitive action and simple structure, so it is mainly used in hydraulic systems with large flow or systems with high sealing performance requirements.

The structure principle and symbol of cartridge valve
It consists of a control cover plate, a cartridge unit (composed of a valve sleeve, a spring, a valve core and a seal),
A cartridge block and a pilot element (arranged on a control cover plate) are composed. Because the cartridge unit of this valve mainly plays the role of controlling on and off in the loop, it is also called two-way cartridge valve. The control cover plate encapsulates the cartridge unit in the cartridge block and communicates the pilot valve and the cartridge unit (also known as the main valve). Through the opening and closing of the main valve spool, the main oil circuit can be controlled. The use of different pilot valves can constitute pressure control, direction control or flow control, and can be composed of composite control. A hydraulic circuit is formed by assembling a number of two-way cartridge valves with different control functions in one or more cartridge blocks.

In terms of working principle, the two-way cartridge valve is equivalent to a liquid-controlled check valve. A and B are the only two operating oil ports of the main oil circuit (called two-way valves), and X is the control oil port. Changing the pressure of the control oil port can control the flow of the A and B oil ports
Fuck. When there is no hydraulic action at the control port, the liquid pressure at the lower part of the spool exceeds the spring force, and the spool is pushed open, A and B phases
The direction of the liquid flow depends on the pressure of port A and port B. Conversely, the control port has a hydraulic action when
When px≥pA or px≥pB, the connection between port A and port B can be closed. In this way, the "not" gate of the logical element is acted upon
It is also called a logic valve.
Cartridge valves can be divided into two categories according to the source of the control oil: the first type is an externally controlled cartridge valve, and the control oil is supplied by a separate power source
The pressure has nothing to do with the pressure change of A and B ports, and is mostly used for the direction control of the oil circuit; The second type is internally controlled insertion
The valve, which controls the A or B port of the oil inlet white valve, is divided into two kinds of spool with damping hole and without damping hole, and is widely used
Extensive.