A pilot valve is used to control other valves or functions by utilizing a smaller control pressure—known as pilot pressure—to open, close, or regulate a larger main valve. The pilot valve is typically electrically actuated, which in turn hydraulically controls the main valve. Pilot valves are commonly used when the main valve requires more force than a solenoid coil can generate. There are two main types of pilot valves: directional on/off pilot valves (which simply open or close the flow) and proportional pressure control pilot valves (which allow for stepless and precise pressure regulation). A 3-way pilot valve is an on/off type.
3-way, FLeX series, solenoid-operated directional spool valve, direct-acting, pilot capacity. Coil options low power 3000 psi, high power 5000 psi or explosion proof.
A 3-way pilot valve is an on/off valve, also referred to as a 3/2 pilot valve, as it has three ports and two positions. The valve switches between connecting the pilot line to either pressure or tank. In this way, pilot pressure can activate the main valve, or be released to allow the main valve to return to its original—often closed—position. This function is especially important to ensure that no pressure remains trapped, for example, in the spring chamber of the main valve, which could otherwise prevent proper operation or stop the valve from returning to its neutral position.
3-way pilot valves are available in both normally open (N/O) and normally closed (N/C) versions. These valves switch a pilot line between being connected to the pressure line or to tank, ensuring that no pressure remains trapped in the spring chamber of the main stage valve.
3-way pilot valves from Sun Hydraulics feature the T-8A cavity, allowing them to be mounted directly in the main stage valve for optimal space utilization. When ordering, remember to specify the main stage valve with an integrated T-8A cavity to ensure a smooth and compact installation.
To electrically control the valve function, both simple and user-friendly amplifiers and I/O units are available. This enables smarter and more automated solutions through electronic feedback of flow, pressure, or temperature, allowing precise regulation and optimization of hydraulic functions in real time. Please contact one of our sales engineers, we will help you find the right components for your needs.
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