Relay cylinder

1.In a variable expansion central-valve engine, a small auxiliary engine for automatically adjusting the steam distribution to the load on the main engine.
References in periodicals archive ?
Tenders are invited for Set Of Gasket Tap Changer And Notching Relay Cylinder,One Set Consisting For Following Two Items, 1 Washer For Percent U2018t Percent U2019 Switch As Per Drg.