Solenoid Directional Control Valve Symbol

Connections to the valve are shown on these squares by capital letters usually they are named only in their normal position and not repeated in other positions actuation system of the valve is also designated.

Solenoid directional control valve symbol. Directional air control valves are the building blocks of pneumatic control. The top symbol shows a manually activated valve that is pushed over against a spring. Figures 8 5 through 8 10 show schematic symbols for 3 way directional control valves. The only difference between this valve and symbol and those in figure 10 23 is that the pilot control is a double solenoid detented valve instead of.

Basics of the iso symbols. Solenoid control valves that change valve position open close etc by direct movment from a solenoid are called direct acting. Schemes of directional valves the description of directional valves is standardized by din iso 121. The iso symbols display only the function of the valves.

The following are different spool positions of schematic symbols that are commonly used in directional control valves. At this point it is necessary to review the three most common center configurations fig. Here is a brief breakdown of how to read a symbol. Solenoid control valves that change position open close etc by opening small pilot circuits allowing pressurised air fluid or gas to move the valve are called pilot operated or servo pressure assisted valves.

The double arrow in the left box shows that the flow may pass in both directions. Each position the valve can take is represented by a square. The symbol for directional control valve is made of number of square boxes adjacent to each other depending on the number of positions. The valves are available in both 2 or 3 position and various spool flow patterns.

Inlet outlet and exhaust or tank. They do not give any further information about the design flow orifice size etc. 3 way directional control valves a 3 way valve has three working ports. The directional control valve symbol is the most intuitive and selfexplanatory of the symbols.

Symbols show the methods of actuation the number of positions the flow paths and the number of ports. A 3 way valve not only supplies fluid to an actuator but allows fluid to return from it as well. The vsd m and vpd m pilot operated directional control valves are available with either electric solenoid or hydraulic actuation of the main spool. This means they have two flow pipe connections and can switch into two different positions.

Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent. 3 1 for spool type directional control valves. The valves shown are all two way two position directional valves.