Pneumatic valve manifolds combine several individual valves into one organized control assembly. A common compressed-air supply can feed the valves while separate working ports connect each valve to its associated actuator.
This arrangement can reduce individual supply lines, organize exhaust connections, simplify mounting, and concentrate the pneumatic controls for several machine functions within one location.
Operation
How Pneumatic Valve Manifolds Work
Compressed air enters a common supply passage within the manifold. Each valve connected to that passage can then control airflow toward one or more working ports.
When a directional valve changes position, the internal valve passages connect supply air to the selected actuator port while another connection may open to exhaust.
Several valves can share the same supply and exhaust infrastructure while controlling independent pneumatic devices.
Valve Functions
Directional Control in Pneumatic Systems
Directional valves determine which pneumatic connections communicate at a given time. Different valve configurations can be used according to the actuator and required motion.
A valve controlling a double-acting cylinder may alternate supply and exhaust between two actuator ports. Simpler devices may require only an on/off airflow function.
Actuators
Connecting Valve Manifolds to Air Cylinders
Pneumatic cylinders require controlled filling and exhausting of their internal chambers. The manifold valve determines which chamber receives compressed air during each movement.
Systems using air cylinders can position the manifold near the actuators to shorten tubing runs or centralize valves inside a machine control area.
Tubing length, port size, valve capacity, cylinder volume, and operating pressure can all affect actuator response.
Exhaust
Managing Pneumatic Exhaust
Unlike a closed hydraulic return circuit, pneumatic systems commonly discharge used air into the surrounding atmosphere after it leaves an actuator.
Valve manifolds may provide common exhaust passages or separate exhaust connections. Silencers can sometimes be fitted to exhaust ports when reducing discharge noise is important.
Exhaust restrictions can influence actuator speed and backpressure, so exhaust routing should be considered along with supply airflow.
Design
Pneumatic Valve Manifold Design Factors
Electrical Actuation
Solenoid-Operated Pneumatic Valve Manifolds
Automated equipment frequently uses electrically actuated valves so a controller can command pneumatic movements according to machine logic.
Each solenoid can correspond to one valve station or valve function, creating an interface between electrical automation and compressed-air power.
Explore Solenoid Valve Manifolds →Applications
Pneumatic Valve Manifold Applications
Valve manifolds are commonly associated with automated machinery containing several pneumatic devices. They can coordinate grippers, clamps, cylinders, gates, tooling, stops, indexing mechanisms, and other repetitive functions.
Concentrating the valves can make the pneumatic architecture easier to organize while also simplifying connections to electrical controls.