Fluid pressure servo operated valve

Claim 1

A VALVE FOR THE FLUSH TANKS OF TOILETS OR THE LIKE COMPRISING A BASE PLATE, A DOME ATTACHED TO SAID BASE PLATE AND PROVIDING A RELATIVELY LARGE PRESSURE CONTROL CHAMBER, SAID BASE PLATE HAVING A FIRST ANNULAR WALL PROJECTING INTO SAID CONTROL CHAMBER, SAID BASE PLATE HAVING A SECOND ANNULAR WALL LOCATED INSIDE OF THE FIRST WALL AND PROJECTING INTO SAID CONTROL CHAMBER, A FLEXIBLE DIAPHRAGM ATTACHED TO THE FIRST WALL AND SEALING OFF THE SPACE INSIDE THE FIRST WALL FROM SAID CONTROL CHAMBER, SAID DIAPHRAGM BEING ARRANGED TO SEAT ON THE SECOND WALL AND SEAL OFF THE SPACE INSIDE THE SECOND WALL FROM THE SPACE BETWEEN THE FIRST AND SECOND WALLS, SAID DIAPHRAGM BEING SUBJECT ON ONE SIDE TO THE PRESSURE IN SAID CONTROL CHAMBER AND ON THE OTHER SIDE TO THE PRESSURES OF THE SPACE INSIDE THE FIRST WALL, FIRST MEANS FOR CONNECTING THE SPACE BETWEEN THE FIRST AND SECOND WALLS TO AN INLET WATER SUPPLY LINE, SECOND MEANS FOR CONNECTING THE SPACE INSIDE THE SECOND WALL TO A SPACE RECEIVING WATER FROM THE VALVE, CONDUIT MEANS INCLUDING A NEEDLE VALVE MEANS TO ADJUST THE RATE OF FLOW FOR CONNECTING THE FIRST MEANS TO THE CONTROL CHAMBER, A RELIEF VALVE FOR SAID CONTROL CHAMBER MOUNTED IN SAID BASE PLATE AND ADAPTED WHEN OPEN TO CONNECT SAID CONTROL CHAMBER TO A SPACE OUTSIDE THE VALVE, SAID RELIEF VALVE BEING MANUALLY OPERATED, WHEN SAID RELIEF VALVE IS OPEN THE PRESSURE OF FLUID IN THE FIRST MEANS ACTING TO LIFT THE DIAPHRAGM FROM ITS SEAT ON THE SECOND WALL TO CONNECT THE FIRST MEANS TO THE SECOND MEANS.