Pressure control device

Claim 1

A PRESSURE CONTROL DEVICE FOR WELL HEAD PRESSURES COMPRISING A BODY ATTACHED TO THE UPPER END OF A WELL CASING, SAID BODY HAVING A PLURALITY OF HOLES THERETHROUGH PARALLEL TO ITS AXIS FOR THE PASSAGE OF PRODUCTION TUBING, COMPRESSIBLE SEALING ELEMENTS SEATED IN THE HOLES OF SAID BODY, HAVING AN INSIDE DIAMETER SIZED TO PERMIT THE PASSAGE OF THE TUBING COUPLINGS, A VERTICALLY MOVABLE RAM ASSEMBLY WITH LONGITUDINAL PASSAGEWAYS ALIGNED WITH HOLES OF THE BODY AND ANNULA RAM EXTENSIONS AT THE LOWER ENDS OF THE PASSAGEWAYS WHOSE CROSS SECTIONS CORRESPOND SUBSTANTIALLY TO THOSE OF THE COMPRESSIBLE SEALING ELEMENTS, CYLINDRICAL TELESCOPING MEMBERS VERTICALLY MOVABLE IN THE ASSEMBLY PASSAGEWAYS, WHEREBY THE LOWER ENDS OF SAID TELESCOPING MEMBERS AND THE ANNULAR RAM EXTENSIONS FROM PLUGERS FOR COMPRESSING THE SEALING ELEMENTS, FLUID PRESSURE CYLINDERS IN A FLUID PRESSURE SYSTEM ATTACHED AT THEIR LOWER ENDS TO THE BODY AND AT THEIR UPPER ENDS TO THE RAM ASSEMBLY WHEREBY THE RAM ASSEMBLY IS MOVED DOWNWARDLY TO COMPRESS THE SEALING ELEMENTS AGAINST THE TUBING IN PRESSURE-TIGHT RELATIONSHIP AND FASTING MEANS BETWEEN THE BODY AND RAN ASSEMBLY FOR HOLDING THEM IN SAID PRESSURE-TIGHT RELATIONSHIP.