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Question:

What is the meaning of two long lines in the hydraulic sign,

such as electrical feedback, the detailed symbol of the general hydraulic check valve, and the detailed symbols of the throttle valve?,There are four - way servo valve, four - way proportional valve. Why do they add a horizontal line on the valve body, do not use it?What do you mean by the long horizontal line up and down?

Answer:

Therefore, servo valve and proportional valve basically painted horizontal lines, fourth valves are determined by the pressure difference valve position of the valve, since there is any position, of course, can also draw a horizontal line
Because the spool is in different positions, the spool of the groove and the valve seat between the opposite position, you can get different flow area, thereby regulating the flow and pressure through the valve
A long horizontal line indicates that the spool of the valve has any intermediate positionFor example, three ordinary valve, and only in two extreme positions, not in the spool from the three position to stay. But drew a horizontal line valve, spool at any position between about two points can stay, the specific location is determined by the control pressure at both ends of the spool or the control current.

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