Dashpot controlled loading valve

Claim 1

A VALVE MECHANISM COMPRISING A HOUSING HAVING A FLOW PASSAGE THERETHROUGH AND A VALVE SEAT ENCIRCLING THE FLOW PASSAGE, A VALVE ASSEMBLY MOUNTED WITHIN THE HOUSING FOR MOVEMENT TOWARD AND AWAY FROM SAID SEAT, SAID VALVE ASSEMBLY DEFINING A CHAMBER THEREWITHIN, PISTON MEANS INCLUDING A HEAD PORTION RECIPROCABLE WITHIN THE CHAMBER WITH THE PERIPHERY OF THE HEAD PORTION IN FLUID SEALING ENGAGEMENT WITH THE CIRCUMFERENTIAL WALL OF THE CHAMBER AND A SHANK PORTION PROJECTING TOWARD SAID VALVE SEAT AND THROUGH AN END WALL OF THE CHAMBER IN SLIDING, FLUID SEALING RELATION THEREWITH TO SEAL THE PART OF SAID CHAMBER BETWEEN SAID HEAD PORTION AND SAID END WALL, VALVE MEANS CARRIED BY SAID SHANK PORTION ENGAGEABLE WITH SAID VALVE SEAT TO CONTROL FLOW THROUGH SAID FLOW PASSAGE, CHECK VALVE MEANS FOR PERMITTING FLOW INTO SAID PART OF THE CHAMBER, ORIFICE MEANS FOR PERMITTING RESTRICTED FLOW FROM SAID PART OF THE CHAMBER, AND OPERATING MEANS FOR MOVING THE VALVE OFF SAID SEAT AND THE SAID VALVE ASSEMBLY AWAY FROM THE SEAT.