Pass-How many times does the starting point and ending point of the arrow intersect with the blocking symbol and a square?
Bits-represented by squares, a few bits are several squares.
Springs -W, m, are drawn on both sides of the square.
Neutral function of the slide valve: that is, the state when the slide valve is in normal state, including M-type, H-type, O-type, P-type, M-type, etc.
Extended data hydraulic valve is used to control the flow direction of oil in hydraulic system or adjust its flow and pressure. As a kind of hydraulic valve, reversing valve controls the flow direction of oil by changing the flow passage. The types of directional control valves include one-way valves, hydraulically controlled one-way valves, directional valves, stroke deceleration valves, filling valves, shuttle valves, etc.
According to the flow direction of the fluid in the pipeline, if the fluid is only allowed to flow in one direction, such valves are called one-way control valves, such as one-way valves and shuttle valves. Control valves that can change the direction of fluid flow are called directional valves, such as two-way, two-way, two-way, two-way, three-way and so on.
According to the working principle, it can be divided into direct-acting valve and pilot valve. Direct-acting valve is a valve that directly realizes the reversing requirement through manpower or electromagnetic force and aerodynamic force. The pilot valve consists of a pilot head and a valve body, and the piston with the pilot head drives the valve stem in the valve body to realize commutation.
According to the working position of the reversing valve rod, the valve can be divided into two-way valve and three-way valve. According to the number of holes on the valve, it can be divided into 2-hole, 3-hole and 5-hole valves.
Baidu encyclopedia-direction control valve