Parker 521811000 4-way 3-position Valve Lever-spring Return

Product Description

The PARKER 521811000 is a 4-way, 3-position mechanically operated directional control valve with a lever-spring return actuator. It is designed for pneumatic or hydraulic circuit control applications where a lever-actuated, spring-centered valve is required to direct flow through multiple ports. The valve features a closed-center (CC) configuration in the neutral position, 1/4 inch NPT inlet and outlet connections, a Cv rating of 0.83, and a maximum working pressure of 150 psi. It is installed by fluid power technicians and industrial maintenance professionals in machinery, automation equipment, and process control systems.

This valve is suited for use in industrial and light commercial applications requiring manual directional control of a fluid or pneumatic circuit. The lever actuator allows the operator to shift the valve between positions, while the spring return automatically returns the spool to the closed-center neutral position upon release. Typical installations include pneumatic actuator control, cylinder sequencing, and directional flow switching in compact manifold or inline configurations using standard 1/4 inch NPT ported plumbing.

Key Features

• 4-way, 3-position closed-center (CC) valve design with 5 ports for directional flow control
• Lever actuator with spring return automatically recenters spool when released
• 1/4 inch NPT inlet and outlet connections for standard threaded pipe installation
• Cv rating of 0.83 for predictable flow performance in low-flow circuit sizing
• Operating pressure range of 0 to 150 psi suits a wide range of pneumatic and low-pressure hydraulic applications
• Working temperature range of 32 to 175 degrees F for standard indoor industrial environments

Compatibility

Designed as an OEM-style or replacement mechanically operated directional control valve for industrial pneumatic and fluid power systems using 1/4 inch NPT ported connections and requiring a 4-way, 3-position closed-center spool configuration.

Installation Notes

Installation should be performed by a qualified fluid power technician or industrial maintenance professional. De-energize and depressurize the system fully before removing any existing valve or making new connections. Ensure all NPT threads are sealed with an appropriate thread sealant rated for the system media and pressure. Verify that the replacement valve spool configuration and port assignments match the existing circuit schematic before returning the system to service.