By Admin on

Based on design characteristics, DCVs can be classified as follows:

+) An internal valve mechanism that directs the flow of fluid. Such a mechanism can either be a poppet, a ball, a sliding spool, a rotary plug or a rotary disk.

+) Number of switching positions (usually 2 or 3).

+) Number of connecting ports or ways.

+) Method of valve actuation that causes the valve mechanism to move into an alternate position.

Classification of DCVs based on the Control Method 

Direct controlled DCV:

                            A valve is actuated directly on the valve spool. This is suitable for small sized valves.

Classification of DCVs based on the Construction of Internal Moving Parts

 Indirect controlled DCV:

                              A valve is actuated by a pilot line or using a solenoid or by the combination of electro hydraulic and electro-pneumatic means. The use of solenoid reduces the size of the valve. This is suitable for large-sized valves.

Rotary spool type: 

                    In this type, the spool is rotated to change the direction of fluid. It has longitudinal grooves. The rotary spools are usually manually operated. 

Sliding spool type: 

                       This consists of a specially shaped spool and a means of positioning the spool. The spool is fitted with precision into the body bore through the longitudinal axis of the valve body. The lands of the spool divide this bore into a series of separate chambers. The ports of the valve body lead into these chambers and the position of the spool determines the nature of inter-connection between the ports.


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