Parker
Parker 521811000 4-way 1/4 in NPT manual air control valve
Controls airflow with a 4-way lever valve, 1/4 NPT ports, 150 psi rating and spring return
- Manual lever operation with spring return for reliable shifting
- Four-way three-position design enables versatile air circuit control
- Quarter-inch NPT threads connect directly to standard fittings
- Rated for 150 psi maximum pressure in pneumatic systems
- Aluminum body resists corrosion while keeping weight low
Parker 4-way manual air valve
The Parker 521811000 is a 4-way, 3-position manual air control valve designed for pneumatic systems. It features a 1/4 inch NPT port size and a lever actuator with spring return. The aluminum body operates within a temperature range of 32 to 175 degrees F.
Integration into pneumatic circuits
This DirectAir 4 series valve requires a compressed air supply rated up to 150 psi. The closed center position blocks all ports when the lever is centred, holding downstream pressure. Its 0.8 Cv coefficient and 0.83 cfm flow capacity suit low-flow control applications.
Thermals, noise and power
The valve operates passively with no electrical power draw and generates no audible noise during actuation. The aluminum body dissipates heat from the compressed air stream within the stated 32 to 175 degree F range. No external cooling or power source is required for normal operation.
Highlights
- Manual lever operation with spring return for reliable shifting
- Four-way three-position design enables versatile air circuit control
- Quarter-inch NPT threads connect directly to standard fittings
- Rated for 150 psi maximum pressure in pneumatic systems
- Aluminum body resists corrosion while keeping weight low
Specifications
| Brand | PARKER |
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Questions about this item
How much airflow can the 521811000 valve pass at its 150 psi pressure rating?
The valve is rated for a maximum flow of 0.83 cfm when operated up to its 150 psi limit.
Does the lever-spring actuator generate noticeable heat or noise during continuous daily operation?
The valve body is aluminium and the actuator is a simple lever with spring return; it has no motor or solenoid, so it produces no electrical noise or self-generated heat beyond the compressed air temperature range of 32 to 175 °F.
What thread type and size must the existing air lines have to connect directly to this valve?
Each of the four ports uses a 1/4 inch NPT connection, so your supply and cylinder lines need matching 1/4 inch NPT fittings.
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