Matching Flow Diagrams to Replace an Air Directional Control Valve
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Choosing an Air Directional Control Valve
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Two-Action Air Directional Control Valves
Also known as 4-way and 4/2 valves, these valves create two actions, such as extending and then retracting a double-acting cylinder. They direct airflow from the inlet to your equipment and exhaust return airflow to create motion. Valves without an exhaust connection exhaust air to the atmosphere.
Valves with hand return actuation stay actuated and return to their original position only when you move the actuator again.
Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve.
Overall | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Flow Ports | Inlet Size | Outlet Size | Max. Flow Rate, scfm @ 100 psi | Flow Coefficient (Cv) | Pressure Range, psi | Vacuum Rating | Ht. | Dia. | Mounting Fasteners Included | Each | ||
Threaded Female Inlet × Threaded Female Outlet | ||||||||||||
Hand Return Actuation | ||||||||||||
| A | 4 | 1/8 NPT | 1/8 NPT | 7.9 | 0.14 | 0-150 | Not Rated | 1 5/8" | 2" | No | 6650K8 | 0000000 |
Single-Action Air Directional Control Valves
Manually control these valves by pushing or turning the actuator. Also known as 3-way or 3/2 valves, they create one action, such as extending a cylinder. They direct airflow from the inlet to your equipment and exhaust return airflow to create motion. In the off position, they exhaust air pressure from the system, allowing equipment to reset so the action can be repeated. Valves without an exhaust connection exhaust air to the atmosphere.
Normally closed valves block airflow until actuated.
Valves with hand return actuation stay actuated and go back to their starting position only when you move the actuator again.
Flow coefficient (Cv) is a measurement that indicates how much airflow can pass through a valve. When selecting between valves with the same port size, choose the valve with the higher flow coefficient to ensure it provides enough airflow to operate your system.
Overall | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Flow Ports | Inlet Size | Outlet Size | Max. Flow Rate, scfm @ 100 psi | Flow Coefficient (Cv) | Pressure Range, psi | Vacuum Rating, in. of Hg | Actuator Color | Ht. | Dia. | Mounting Fasteners Included | Each | ||
Normally Closed Flow Positions | |||||||||||||
Hand Return Actuation | |||||||||||||
| A | 3 | 1/8 NPT | 1/8 NPT | 7.9 | 0.14 | 0-150 | Not Rated | Black | 1 5/8" | 2" | No | 6650K7 | 0000000 |