Irrigation system employing flexible conduits

Claim 1

AN IRRIGATION CONDUIT SYSTEM COMPRISING, IN COMBINATION, A RIGID HOUSING HAVING A FIRST CONDUIT THERETHROUGH TO GENERALLY CIRCULAR CROSS SECTION, A COLLAPSIBLE SECOND CONDUIT OF ABOUT THE SAME CIRCULAR CROSS SECTION AS SAID FIRST CONDUIT, MEANS ATTACHING ONE END OF SAID SECOND CONDUIT TO THE WALL OF SAID FIRST CONDUIT, A PIPE SURROUNDING SAID SECOND CONDUIT, A SOURCE OF IRRIGATION WATER UNDER PRESSURE COMMUNICATING WITH THE OTHER END OF SAID SECOND CONDUIT, A RISER CONDUIT COMMUNICATING WITH SAID FIRST CONDUIT, A RISER HOUSING COMMUNICATING WITH SAID FIRST CONDUIT, SAID RISER CONDUIT AND SAID RISER HOUSING EXTENDING VERTICALLY FROM SAID FIRST CONDUIT, A VALVE ASSEMBLY IN SAID RISER CONDUIT AND SAID RISER HOUSING NEAR THEIR BOTTOM ENDS FOR OPENING AND CLOSING SAID RISER CONDUIT TO THE FLOW OF WATER, SAID VALVE ASSEMBLY COMPRISING MEANS IN SAID RISER CONDUIT AND IN SAID RISER HOUSING NEAR THEIR BOTTOM ENDS FOR OPENING SAID RISER CONDUIT IN RESPONSE TO PRESSURE IN THE FIRST AND SECOND CONDUITS ABOVE A PREDETERMINED SUPER-ATMOSPHERIC PRESSURE AND CLOSING SAID RISER CONDUITIN RESPONSE TO A PRESSURE BELOW SAID PRESSURE IN SAID CONDUITS THEREBY MAINTAINING SAID COLLAPSIBLE CONDUIT IN AN EXPANDED CONDITION.