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Understand Valve Versatility for Better Designs (.PDF Download)

Directional control valves perform three functions: stopping, allowing, and changing the direction of fluid flow. Although international standards describe a valve by its number of ports, it is common in North America to use the term ways, so a 4-way valve is a valve having four ports. Double-acting actuators require 4-way valves because they pressurize and exhaust two pairs of ports independently. Both hydraulic and pneumatic circuits use them, but a 3-position, 4-way valve is more common in

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