Pneumatic Valves

About pneumatic valves

Pneumatic valves regulate the flow and pressure of compressed air within a system, controlling actuators, cylinders, and other pneumatic components. Key types include solenoid valves, which use an electrical signal to actuate a spool or poppet; manual valves, operated by levers, pushbuttons, or rotary mechanisms; check valves, which permit flow in one direction only; and flow-control valves, designed to meter the rate of air flow. Manifold valves consolidate multiple valve functions into a single block, simplifying plumbing and reducing space requirements. Selection criteria typically involve port size (e.g., 1/8 NPT, G1/4), operating pressure range (e.g., 0.15 to 1.0 MPa), flow rate (e.g., Cv factor or L/min), and actuation method (e.g., 24V DC solenoid, detented lever). Spool configurations are often designated by the number of ways and positions (e.g., 5/2-way, 3/2-way normally closed). Common body materials include aluminum, brass, and engineering plastics, with seals typically made from NBR, FKM, or EPDM, chosen based on operating temperature and media compatibility.