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Now that you know the operating parameters for your hydraulic system, you must specify the high-pressure water valves needed to meet the operation and actuation requirements of your application. Will a poppet valve meet your needs? Or do you need the robust performance of a hollow spore spool valve?

Poppet Valve Instructional Diagram
The following are the most common high-pressure water valve designs for hydraulic applications:

1. Poppet valve: 
Operation: A cone- or ball-shaped plug is held in place on the valve seat by a bias spring or hydraulic piston when operating as normally closed. When the plug is permitted to move away from the valve seat, fluid flows through the valve.Actuation: Poppet valves can

Actuation: Poppet valves can controlled by manual operation, a solenoid, pneumatic/hydraulic pressure or a combination of methods.Advantage: This industrial valve offers a higher flow rate than spool-style valves. Its internal seals experience less wear, extending its operational life.

Advantage: This industrial valve offers a higher flow rate than spool-style valves. Its internal seals experience less wear, extending its operational life.

2. Spool valve: 
Operation: This industrial valve contains a piston or spool that extends and retracts in the valve housing. As the spool travels, it opens or closes ports in the valve body. Flow through the valve is determined by the position of the spool.Actuation: This industrial valve is actuated in a similar way to the poppet valve.

Actuation: This industrial valve is actuated in a similar way to the poppet valve.Advantage: Spool valves are not effected by pressure, requiring less force for actuation. They are balanced and can be used for vacuum operation.

Advantage: Spool valves are not effected by pressure, requiring less force for actuation. They are balanced and can be used for vacuum operation.

3. Hollow bore spool valve:
Operation: With this type of industrial valve, the spool is hollow and contains a series of slots that are spaced evenly around the circumference of the spool.

Actuation: When in the open position, the spool is extended to a position where the slots are located between two seals. As fluid enters the inlet, it travels into the valve body, up through the spool, out through the slots and into the valve outlet. When the spool is retracted, a section of the plunger without slots moves between the seals to prevent flow from reaching the outlet. The seals are only briefly subjected to the water flow, which is advantageous when working with flow media that contains contaminants.

Advantage: This valve can operate over extended periods of time with water that contains some degree of contamination from sand or scale.

Remember to plan ahead when selecting your hydraulic system components, including high-pressure water valves, so you can get the safety and performance required by your application.

To learn more about industrial valve selection for high-pressure hydraulic applications, download “How to Select the Right Valve for High-Pressure Water Applications“.