Bistable pneumatic logic element and valves

Claim 1

A PNEUMATIC BISTABLE ELEMENT HAVING FIRST AND SECOND CHAMBER MEANS; FIRST AND SECOND INPUT MEANS FOR CONNECTING A SOURCE OF PNEUMATIC PRESSURE TO EACH OF SAID CHAMBER MEANS, SAID FIRST INPUT MEANS HAVING A LARGER FLOW CAPACITY THAN SAID SECOND INPUT MEANS; PRESSURE REPONSIVE MEANS SEPARATING SAID CHAMBER MEANS AND DEFLECTABLE TO A SET POSITION AND A RESET POSITION, SAID PRESSURE RESPONSIVE MEANS CLOSING SAID FIRST INPUT MEANS CONNECTED TO ONE OF SAID CHAMBER MEANS IN SAID SET CONDITION AND CLOSING SAID FIRST INPUT MEANS CONNECTED TO THE OTHER OF SAID CHAMBER MEANS IN SAID RESET POSITION; MEANS CONNECTED TO EACH OF SAID CHAMBER MEANS FOR OBTAINING A PNEUMATIC PRESSURE OUTPUT FROM EACH OF SAID CHAMBER MEANS; AND MEANS FOR CONNECTING EACH OF SAID CHAMBER MEANS TO A CONTROL MEANS WHEREBY A DIFFERENTIAL PRESSURE MAY BE CREATED BETWEEN SAID CHAMBER MEANS BY THE CONTROL MEANS FOR DEFLECTING SAID PRESSURE RESPONSIVE MEANS TO SAID SET CONDITION OR SAID RESET CONDITION, SAID PRESSURE RESPONSIVE MEANS MAINTAINING SAID DIFFERENTIAL PRESSURE IN SAID CHAMBERS AFTER OPERATION OF SAID CONTROL MEANS.