Based on their long life, small size, rugged construction and attractive appearance, the Humphrey (Total Air Control) TAC, TAC-2 and TAC-3 family of manual/mechanical air valves are popular choices by design automation engineers.
The small stainless steel push button or plated-steel toggle are popular for panel mounting solutions to start, sequence or control equipment with the same outward appearance as traditional electric-style machine controls.
The wide variety of valves is available as 2-, 3- and 4-way in three sizes, and either spring return or detent function. Unique and miniature, three-position, 4-way exhaust-center valves in toggle or rocker operator are also available.
Humphrey asserts pneumatic logic and sequencing provides a simple, reliable, cost effective alternative to PC or PLC control. Many of today's simpler machine control, secondary operations, and assembly fixtures do not require, or sometimes even permit expensive PC or PLC control, particularly in hazardous environments.
The heart of Humphrey TAC system is the push button valve. All TAC/TAC-2 push button valves are produced with a single-button operator design, such that a variety of manual, mechanical, or air-pilot operators can be added with ease (i.e., thread-on air operator, 34A, to 3P valve, and 3P push button valves becomes air-pilot valve).