Parker 520211000 4-way 2-position Valve 1/4 Inch Npt

Product Description

The PARKER 520211000 is a 4-way, 2-position mechanically operated directional control valve designed for pneumatic circuit switching in industrial and automation applications. Actuated by a roller-spring return mechanism, the valve shifts to its alternate position when the roller contacts a cam or trip dog, then returns automatically via spring force when the actuator is released. The valve carries a Cv rating of 0.83 and is rated for working pressures from 0 to 150 psi. With 5 ports and NPT threaded connections, it suits inline pneumatic plumbing where positive mechanical actuation and reliable spring return are required. Installation is typically performed by industrial maintenance technicians or pneumatic system integrators.

This valve is suited for pneumatic directional control on light-duty to medium-duty industrial equipment, including conveyors, clamping fixtures, and actuator sequencing systems. The 1/4 inch NPT inlet and outlet ports allow direct connection to standard compressed-air lines. The roller-spring return configuration makes it appropriate for applications where the valve must reset to its home position without external electrical or manual input, such as end-of-stroke detection on linear actuators or machine guarding circuits.

Key Features

• 4-way, 2-position spool configuration for directional air flow switching
• Roller-spring return actuator provides automatic reset to home position on cam disengagement
• Cv rating of 0.83 supports controlled flow in compact pneumatic circuits
• 0 to 150 psi working pressure range suits standard shop-air and pneumatic control systems
• 1/4 inch NPT threaded ports on both inlet and outlet for straightforward inline plumbing
• 5-port design enables full 4-way directional control in a single valve body
• Operating temperature range of 32 degrees F to 175 degrees F covers most indoor industrial environments

Compatibility

Designed as an OEM-style replacement or direct-fit component for pneumatic directional control circuits requiring a 4-way, 2-position mechanically operated valve with 1/4 inch NPT porting and roller-spring return actuation.

Installation Notes

Installation should be performed by a qualified pneumatic technician or industrial maintenance professional. Depressurize and lock out the compressed-air supply before removing or installing the valve. Ensure all NPT threaded connections are made with appropriate thread sealant rated for pneumatic service and tightened to avoid leaks without over-stressing the port threads. Verify the roller actuator alignment with the trip cam or actuating surface before returning the system to service.