Automatic shut-off valve

Claim 1

IN AN AUTOMATIC AND MANUALLY RESETTABLE SHUT-OFF VALVE OPERATIVE TO PASS FLUID CONCURRENTLY WITH THE FLOW OF CURRENT IN AN ELECTRIC CIRCUIT AND TO TERMINATE THE FLOW OF FLUID UPON CIRCUIT FAILURE IN COMBINATION, A VALVE CASING PROVIDING A VALVE SEAT, A VALVE MEMBER MOVABLE AXIALLY BETWEEN OPEN AND CLOSED POSITIONS WITH RESPECT TO THE SEAT, FIRST SPRING MEANS YIELDINGLY URGING SAID VALVE MEMBER TOWARD SAID SEAT, A YOKE MEMBER AXIALLY SLIDABLE ON SAID VALVE MEMBER AND MOVABLE BETWEEN PROXIMATE AND REMOTE POSITIONS WITH RESPECT TO THE SEAT, MEANS ON SAID VALVE AND YOKE MEMBERS RESPECTIVELY DEFINING A PAIR OF OPPOSED SHOULDERS, A KNOCK-OUT ARM ADAPTED FOR POSITIONING BETWEEN SAID SHOULDERS AND OPERATIVE WHEN SO POSITIONED TO MAINTAIN THE VALVE MEMBER OPEN WHEN THE YOKE MEMBER IS IN ITS REMOTE POSITION, A SOLENOID ADAPTED FOR POSITIONING IN THE ELECTRIC CIRCUIT AND INCLUDING AN IMPACT PLUNGER MOVABLE BETWEEN A PROJECTED POSITION WHEREIN A PORTION THEREOF IS INTERPOSED BETWEEN SAID SHOULDERS IN BLOCKING RLEATION WITH RESPECT TO THE KNOCK-OUT ARM AND A RETRACTED OUT-OF-THE-WAY POSITION, SECOND SPRING MEANS YIELDINGLY URGING SAID PLUNGER TOWARD ITS PROJECTIED POSITION, SAID PLUNGER BEING MOVABLE TO ITS RETRACTED POSITION AGAINST THE ACTION OF SAID SECOND SPRING MEANS UPON ENERGIZATION OF THE SOLENOID, SAID KNOCK-OUT ARM BEING MOVABLE BETWEEN AND ADVANCED POSITION WHEREIN IT IS DISPOSED BETWEEN SAID SHOULDERS AND A WITHDRAWN POSITION, THIRD SPRING MEANS NORMALLY URGING SAID KNOCK-OUT ARM TOWARD ITS ADVANCED POSITION, SAID PLUNGER BEING OPERATIVE WHEN THE YOKE MEMBER IS IN ITS REMOTE POSITION AND THE KNOCKOUT ARM IS POSITIONED BETWEEN SAID SHOULDERS AND UPON DEENERGIZATON OF THE SOLENOID FORCIBLY TO ENGAGE THE KNOCK-OUT ARM AND DISPLACE THE SAME FROM BETWEEN THE SHOULDERS AGAINST THE ACTION OF SAID THIRD SPRING MEANS, SAID YOKE MEMBER WHEN IN ITS PROXIMATE POSITION PERMITTING ENTRY OF THE KNOCK-OUT ARM BETWEEN SAID SHOULDERS FOR VALVE-OPENING PURPOSES DURING MOVEMENT OF THE YOKE MEMBER TOWARD ITS REMOTE POSITION, AND MANUALLY OPERABLE RESET MEANS FOR MOVING SAID YOKE MEMBER BETWEEN ITS PROXIMATE AND REMOTE POSITIONS AND FOR MAINTAINING THE SAME IN THE LATTER POSITION.