The Drallim Rotary Selector Valve (RSV) was formally called the Pneumatic Interlok Valve.

A Fluid Control Valve Suitable For Air/Gases/Vapours and other Liquids, Pressure range –1 +10 Bar, 

Fluid Temperature 85°C (185°F) Available in Brass and St/Stl, with Fluoro-Elastomer Seals and PTFE or ACETAL Resin Stems, depending on the nature of the fluid or gas being used. 

Some Typical Applications of Rotary Selector Valves (RSV)

Propeller pitch controls
Fuel changeover systems
Energy conservation control systems
Tank gauging
Emergency Stop system on trains
Water fountain display control
Cylinder control and bypass and test circuits.

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