Control system

Claim 1

A CONTROL SYSTEM COMPRISING: A PRESSURE SOURCE, CONTROL VALVE MEANS, LOCKOUT VALVE MEANS, A RESERVOIR, AND POWER OPERATED MEANS; SAID CONTROL VALVE MEANS BEING COMMUNICATED TO SAID PRESSURE SOURCE, SAID POWER OPERATED MEANS AND SAID RESERVOIR; SAID LOCKOUT VALVE MEANS COMPRISING A FIRST MEMBER WHICH IS ARRANGED TO CLOSE OFF COMMUNICATION BETWEEN SAID POWER OPERATED MEANS AND SAID CONTROL VALVE MEANS BY THE PRESSURE AT SAID POWER OPERATED MEANS AND TO OPEN COMMUNICATION THEREBETWEEN BY PRESSURE CONDUCTED TO SAID POWER OPERATED MEANS FROM SAID PRESSURE SOURCE; SAID LOCKOUT VALVE MEANS COMPRISING A SECOND MEMBER COMMUNICATED WITH SAID CONTROL VALVE MEANS ARRANGED TO ENGAGE SAID FIRST VALVE MEMBER TO OPEN COMMUNICATION BETWEEN SAID POWER OPERATED MEANS AND SAID CONTROL VALVE MEANS IN RESPONSE TO PRESSURE COMMUNICATED TO SAID SECOND MEMBER FROM SAID PRESSURE SOURCE; SAID CONTROL VALVE MEANS IN NEUTRAL POSITION COMMUNICATING SAID FIRST VALVE MEMBER AND SAID SECOND MEMBER OF SAID LOCKOUT MEANS TO SAID RESERVOIR, IN A FIRST OPERATING POSITION COMMUNCIATING SAID FIRST VALVE MEMBER TO SAID PRESSURE SOURCE WHILE COMMUNICATING SAID SECOND MEMBER WITH SAID RESERVOIR, IN A SECOND OPERATING POSITION COMMUNICATING SAID SECOND MEMBER WITH SAID PRESSURE SOURCE WHILE COMMUNICATING SAID FIRST VALVE MEMBER WITH SAID RESERVOIR; SAID CONTROL VALVE MEANS HAVIONG A PAIR OF PILOT OPERATING CHAMBERS; SENSING VALVE MEANS COMMUNICATED WITH SAID PILOT OPERATING CHAMBERS AND WITH SAID PRESSURE SOURCE, SAID SENSING VALVE MEANS WHEN IN A FIRST AND SECOND OPERATING POSITION COMMUNICATING SAID PRESSURE SOURCE WITH A RESPECTIVE ONE OF SAID PILOT OPERATING CHAMBERS AND CUTTING OFF SAID LAST NAMED COMMUNICATION WHEN IN NEUTRAL POSITION; SAID CONTROL VALVE MEANS BEING RESPONSIVE TO PRESSURE COMMUNICATED TO SAID PILOT MEANS BEING ING CHAMBERS TO MOVE TO ITS FIRST OPERATING POSITION, SECOND OPERATING POSITION, AND NEUTRAL POSITION WHEN SAID SENSING VALVE MEANS IS IN ITS FIRST OPERATING POSITION, SECOND OPERATING POSITION, AND NEUTRAL POSITION, RESPECTIVELY; WHEREBY SAID PRESSURE SOURCE WILL BE COMMUNICATED WITH SAID POWER OPERATED MEANS WHEN SAID CONTROL VALVE WITH IS IN SAID FIRST OPERATING POSITION AND SAID POWER OPERATED MEANS WILL BE COMMUNICATED TO SAID RESERVOIR WHEN SAID CONTROL VALVE MEANS IS IN SAID SECOND OPERATING POSITION; SAID CONTROL VALVE MEANS HAVING A FLOW-THROUGH PORT, SAID CONTROL VALVE MEANS COMMUNICATING SAID FLOWTHROUGH PORT WITH SAID PRESSURE SOURCE VALVE MEANS COMPOSITION; AN INLET PORT FOR SAID CONTROL VALVE MEANS COMMUNICATED WITH SAID PRESSURE SOURCE; DIRECTIONAL VALVE MEANS; SAID DIRECTIONAL VALVE MEANS BEING COMMUNICATED WITH SAID PRESSURE SOURCE, SAID RESERVOIR, SAID INLET PORT AND SAID FLOW-THROUGH PORT OF SAID CONTROL VALVE MEANS, AND WITH SAID SENSING VALVE MEANS; SAID DIRECTIONAL VALVE MEANS HAVING A POWER BEYOND PORT; SAID DIRECTIONAL VALVE MEANS IN ONE POSITION COMMUNICATING SAID PRESSURE SOURCE WITH SAID SENSING VALVE MEANS AND WITH SAID CONTROL VALVE MEANS INLET PORT AND COMMUNICATING SAID FLOWTHROUGH PORT WITH SAID POWER BEYOND PORT, AND IN ANOTHER POSITION CUTTING OFF COMMUNICATION BETWEEN SAID PRESSURE SOURCE AND SAID SENSING VALVE MEANS, AND BETWEEN SAID PRESSURE SOURCE AND SAID INLET PORT AND COMMUNICATING SAID PRESSURE SOURCE WITH SAID POWER BEYOND PORT AND COMMUNICATING SAID FLOW-THROUGH PORT WITH SAID RESERVOIR.