Ellis/Kuhnke Controls provides numerous pneumatic valves in mechanically, manually, pneumatically and electrically operated configurations. The pneumatic operated valves are available in both spool and poppet designs with 0.125" to 0.5" porting, 3- or 4-way, and in 2 or 3 position versions.

Versa Products manufactures a line of air control valves for process control, robotic, packaging, and similar applications. These directional control valves use a patented anti-extrusion arrangement of O-ring seals to offer leak-proof valves, and are made from brass, aluminum, stainless steel, and other materials. The company's V/T and V-316 valves can handle any air power task from vacuum to 200 psi, and offer features such as lockout, latching manual reset, and redundant coils. Body-ported options like the C5 and C7 provide flow ratings of 0.197 to 0.75 and 0.276 to 1.6, respectively, while the Series B316 are appropriate as reset and relay valves for emergency shutdown panels.

ASCO Valve makes a complete line of 2-, 3-, and 4-way air piloted and solenoid operated directional control valves from sizes 10-32 to 1" and flows from 0.02 Cv through 7.0 Cv. The pneumatic control valves are appropriate for applications such as medical, motion control, and robotics, and come as 3- and 4-way poppet, 5 port, and 2- and 3-way position spool valves, up to a pressure of 150 psi. The air-assisted solenoid valves have flow capabilities from 0.001 Cv through 12.5 Cv. The company also manufactures direct acting solenoid valves and the SENTRONIC valve, an electropneumatic pressure-regulating valve with a pressure range from vacuum to 725 psi, hysteresis of 0.5%, repeatability of 0.5%, and linearity of 0.5%.

The Knotts Company distributes pneumatic valves from eight different manufacturers. Air valves from Allenair and Humphrey are available in 2-, 3-, or 4-way, inline, manifold, single or double solenoid, in either brass, aluminum, or stainless steel; valves from Deltrol include flow, needle, check, slide, and quick exhaust. Other similar choices are available from KIP, Norgren, Peter Paul, Pneumadyne, and Versa.