Solenoid Directional Control Valve Symbol

The symbol for directional control valve is made of number of square boxes adjacent to each other depending on the number of positions.

Solenoid directional control valve symbol. Directional air control valves are the building blocks of pneumatic control. Here is a brief breakdown of how to read a symbol. The following are different spool positions of schematic symbols that are commonly used in directional control valves. Pneumatic circuit symbols representing these valves provide detailed information about the valve they represent.

Solenoid control valves that change valve position open close etc by direct movment from a solenoid are called direct acting. At this point it is necessary to review the three most common center configurations fig. 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.

2 way d irectional control valves the 2 way directional valve often has 2 ports normally known as inlet and outlet. A 3 way valve not only supplies fluid to an actuator but allows fluid to return from it as well. The valves shown are all two way two position directional valves. The vsd m and vpd m pilot operated directional control valves are available with either electric solenoid or hydraulic actuation of the main spool.

Each position the valve can take is represented by a square. Symbols show the methods of actuation the number of positions the flow paths and the number of ports. Double solenoid 2 position pilot operated detented 4 way directional control valve figure 10 24 has a cutaway view and symbol for a detented solenoid pilot operated directional control valve. Inlet outlet and exhaust or tank.

The valves are available in both 2 or 3 position and various spool flow patterns. 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. Some experience with the directional control valve symbol has already been gained. Figures 8 5 through 8 10 show schematic symbols for 3 way directional control valves.

The directional control valve symbol is the most intuitive and selfexplanatory of the symbols. 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. Schemes of directional valves the description of directional valves is standardized by din iso 121. They do not give any further information about the design flow orifice size etc.

The top symbol shows a manually activated valve that is pushed over against a spring. Basics of the iso symbols. The iso symbols display only the function of the valves.