Yuken Solenoid Controlled Pilot Operated Directional Valves

These valves are a combination of a small solenoid operated directional valve and a large pilot operated directional valve. The small four-way solenoid valve is used for directional control of the pilot line. The main valve (main spool) provides directional control of the main line. The pilot operated directional valve includes the spring offset, spring-centered and no-spring types. The main valve (main spool) combinations are as shown in Table 4.6. A pilot choke can be installed between the pilot valve and the main spool to adjust the pilot flow for
decreasing the changeover speed of the main spool. Thus, shock upon actuator start or stop can be reduced. Delay of the spool response to a solenoid changeover varies according to the fluid viscosity and the pilot pressure and flow.

The pilot pressure must be 0.5 to 1 MPa (72.5 to 145 psi) or higher.

Table 4.6 shows combinations of pilot operated directional valves and main spools.

Figure 4.4 shows a solenoid controlled pilot operated directional valve of the 3/4 size (DSHG-06).Table 4.7 and Figure 4.5 show the specifications and changeover time of the valve.

Solenoid Controlled Pilot Operated Directional Valves, Size 3/4

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