Working Principle of Rotary Valves


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Rotary valves

The rotary spool directional control valve (Figure 1) has a round core with one or more passages or recesses in it. The core is mounted within a stationary sleeve. As the core is rotated within the stationary sleeve, the passages or recesses connect or block the ports in the sleeve. The ports in the sleeve are connected to the appropriate lines of the fluid system.

Figure 1 : Parts of a rotary spool directional control valve.

Construction of a rotary spool directional control valve. We connect different ports by rotating the handle. By rotating the handle, core gets connected to different holes to give the required configuration of the valve. This type of the valve can be directly mounted on panel using bolt.

Below Figure shows three different position of the core when the handle is rotated. Left most envelope of DCV connects P to B and A to T. Middle envelope of DCV blocks all ports. Right most envelope of DCV connects P to A and T to B.

Figure : Three different positions of 4/3 way rotary spool directional control valve.

Table 1 : shows schematically the different position of core and sleeve for various middle position of 4/3 way Direction control valve.

Table 1 : Different position of core and sleeve for various mid position of 4/3 DCV