Liquid-ring gas pumps

Claim 1

A LIQUID-RING GAS PUMP COMPRISING A STATIONARY HOUSING INCLUDING OPPOSING HEAD MEANS, A STATIONARY WALL MEANS POSITIONED BETWEEN THE HEAD MEANS AND DEFINING A PUMP CHAMBER, A SHAFT ROTATABLY EXTENDING THROUGH THE CHAMBER AND SEALINGLY AND ROTATABLY EXTENDING THROUGH THE OPPOSING HEAD MEANS, SAID STATIONARY WALL MEANS INCLUDING A SIDE WALL MEANS ARRANGED AXIALLY OF THE SHAFT AND A FIRST AND A SECOND STATIONARY CONTROL DISC, SAID DISCS BEING STRUCTURALLY ASSOCIATED WITH THE SIDE WALL MEANS AND EXTENDING TRANSVERSELY THEREOF AND OF THE SHAFT AND SPACED APART ALONG THE AXIS OF THE SHAFT, SAID SHAFT PASSING THROUGH THE DISCS, AN IMPERFORATE PARTITION FIXED TRANSVERSELY BETWEEN THE WALL MEANS AND HAVING ONLY A SINGLE TRANSVERSE OPENING THROUGH WHICH THE SHAFT PASSES, SEALING MEANS BETWEEN THE SHAFT AND THE PARTITION, SAID PARTITION BEING INTERPOSED BETWEEN THE DISCS AND DISPOSED PARALLEL THERETO IN SPACED RELATION WITH THE DISCS AND DISPOSED THE AXIS OF THE SHAFT TO DIVIDE THE CHAMBER INTO TWO SEPARATE AND INDEPENDENT CHAMBER SECTION, TWO SEPARATE AND INDIVIDUAL IMPELLERS FIXEDLY MOUNTED ON THE SHAFT AND DISPOSED IN SPACED RELATION ALONG THE AXIS OF THE SHAFT, ONE OF SAID IMPELLERS BEING OPERATIVELY DISPOSED IN ONE OF THE CHAMBER SECTIONS AND THE OTHER OF SAID IMPELLERS BEING OPERATIVELY DISPOSED IN THE OTHER OF SAID CHAMBER SECTIONS, INLET MEANS AND OUTLET MEANS FOR THE CONVEYED MEDIUM STRUCTURALLY ASSOCIATED WITH THE HEAD MEANS OUTWARDLY OF THE DISCS, SAID DISCS HAVING PASSAGES FOR THE CONVEYED MEDIUM, AND MEANS ASSOCIATED WITH THE HEAD MEANS AND ASSOCIATED WITH THE CHAMBER SECTIONS FOR SELECTIVELY CONNECTING SAID IMPELLERS IN A TWO-STAGE SERIES PUMP OPERATION AND CONNECTING SAID IMPELLERS IN A PARALLEL ONE-STAGE PUMP OPERATION.