What type of selector valve is most commonly used in hydraulic systems for simultaneous flow?

The four-port, closed-center valve is commonly used in hydraulic systems when simultaneous flow is required. This type of valve allows for multiple circuit paths to be serviced at the same time, which is essential in applications where multiple actuators need to operate in coordination without competing for flow.

The closed-center configuration helps maintain system pressure by preventing flow from moving through the valve unless directed by control signals. Since it possesses four ports, it can efficiently manage the flow between various components in the hydraulic circuit while ensuring that the operation remains fluid and controlled.

This functionality makes the four-port, closed-center valve ideal in systems where precise control and simultaneous operation are necessary, such as in heavy machinery, where multiple hydraulic functions may be needed concurrently.