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Introduced in 1960, the ROSS Series 27 inline valves have lead the industry with its innovative head and body design. Known for its longevity and consistent response times over the life of the valve, the Series 27 has become a proven standard and a customer favorite. To meet specific application needs, Series 27 LOGICAIR^® adaptors provide special functions. When coupled with the many possible configurations of Series 27 valves, they create a powerhouse of possibilities

The Timed Sequence adaptors come in both air control or solenoid piloted designs. They allow the actuation or de-actuation of a valve to be delayed up to 30 seconds for 2-way valves, and up to three seconds for 3- or 4-way valves. For a "timed in" function, the air signal is applied (or solenoid is energized) after the preset time delay valve is actuated. When the air signal is removed (or solenoid is de-energized), the valve is immediately deactuated. For a "timed out" function, the air signal is applied (or solenoid is energized) and the valve is immediately actuated. When the air signal removed (or the solenoid is de-energized), after the preset time delay, the valve is deactuated. A "timed in and timed out" function is also available which combines these previous two options.

The "F" modification adaptors are used in conjunction with the timed-in air sequence adaptor, above. They permit valve actuation and deactuation to be controlled by the pressure at the inlet port. When pressure is applied, an internal passage conducts the pressure to the sequence adaptor. After the preset time delay, the valve is actuated. When pressure is removed from the inlet port, the valve is deactuated.

"Q" adaptors are used in conjunction with a Timed Sequence adaptor (air or solenoid piloted), above, to increase the maximum time delay interval to 60 seconds. It also helps to obtain "snap" action of the valve. By keeping pressure off the main valve piston until it is high enough to ensure prompt valve response, the "Q" adaptor prevents the piston from creeping.

Air Index adaptors are used in applications requiring momentary/pulse controls. The air index adaptor allows a valve with a single signal source (or single solenoid pilot) to function as an impulse-controlled, mechanically-detented valve. Successive momentary signals from the same source will actuate and de-actuate the valve.

"PB" adaptors provide an increase in the actuating force on the valve piston which is useful in applications where the inlet pressure exceeds the available signal pressure, or when the signal pressure is less than 15 psig (1 bar). The valve's signal (pilot) pressure is applied to a piston in the "PB" adaptor that has a larger area than the piston in the valve. The force on the piston in the adaptor is thereby larger than that which could be produced by the piston in the valve. This larger force is applied to the valve's piston directly so that there is then sufficient force to shift the valve properly.

Air Index controls allow a valve with a single signal source (or controlled by a single solenoid pilot) to function as an impulse-controlled, mechanically-detented valve. A momentary pressure (or electrical) signal shifts and holds the valve. A second momentary pressure signal from the same source returns the valve to its original position.

When combined with the Series 27's many configurations, the application possibilities are almost limitless.

For more information on how the Series 27 valves or adaptors can help solve your application needs, please download Bulletin 104G, consult your local ROSS distributor or contact ROSS Technical Services.