Hydraulic cylinder-zero external volumetric change type

Claim 1

A HYDRAULIC STRUT FOR USE BETWEEN TWO RELATIVELY MOVABLE STRUCTURES COMPRISING A CASING ADAPTED TO BE SECURED TO ONE OF SAID STRUCTURES AND HAVING A HIGH PRESSURE FLUID CHAMBER THEREIN CONNECTED BY AN APERTURE THROUGH ONE END OF SAID CASING DEFINING A COMPRESSION CYLINDER AND A BORE IN THE OTHER END DEFINING A TENSION CYLINDER; A COMPRESSION STROKE VALVE INCLUDING A HEAD DISPOSED IN SAID HIGH PRESSURE CHAMBER HAVING A HOLLOW STEM EXTENDING THROUGH SAID COMPRESSION CYLINDER; A TENSION STROKE VALVE INCLUDING A HEAD DISPOSED IN SAID HIGH PRESSURE CHAMBER AND A HOLLOW STEM EXTENDING IN SAID TENSION CYLINDER; SAID HEADS OF SAID COMPRESSION AND TENSION STROKE VALVES EACH HAVING A HOLE ALIGNED WITH THE HOLLOW OF ITS STEM; A ROD HAVING AN END ADAPTED TO BE SECURED TO THE OTHER SAID STRUCTURE AND THE OTHER END INSERTED THROUGH THE HOLLOW OF SAID STEM OF SAID COMPRESSION STROKE VALVE AND INTO THE HOLLOW OF SAID STEM OF SAID TENSION STROKE VALVE; A SHOULDER ON THE PORTION OF SAID ROD WITHIN THE HOLLOW OF SAID TENSION STROKE VALVE STEM AND A SHOULDER ON THE PORTION OF SAID ROD WITHIN THE HOLLOW OF SAID COMPRESSION STROKE VALVE STEM ADAPTED TO ENGAGE THE UNDER SIDE OF SAID HEAD WITHIN THEIR STEMS WHEREBY INWARD MOVEMENT OF SAID ROD UNSEATS AND COMPRESSION STROKE VALVE MOVING THE STEM THEREOF INTO SAID HIGH PRSSURE CHAMBER, DISPLACING FLUID AND CREATING A LOW PRESSURE CAVITY BETWEEN THE ROD SHOULDER AND VALVE HEAD IN SAID COMPRESSION VALVE STEM, AND OUTWARD MOVEMENT OF SAID ROD UNSEATS SAID TENSION STROKE VALVE MOVING ITS STEM INTO SAID HIGH PRESSURE CHAMBER AND CREATE A LOW PRESSURE CAVITY BETWEEN THE ROD SHOULDER AND VALVE HEAD IN SAID COMPRESSION VALVE STEM; AND PASSAGE MEANS CONNECTING SAID HIGH PRESSURE CHAMBER OF THE HOLLOWS OF SAID STEMS OF SAID VALVE INCLUDING A GROOVE IN THE END WALL AROUND SAID APERTURE AND SAID BORE, A HOLE IN THE STEM OF SAID VALVES AT THE NECK THEREOF AND A PASSAGE THROUGH THE INTERMEDIATE PORTION OF SAID ROD, AND SAID VALVE HEADS ADAPTED TO CLOSE AND OPEN SAID PASSAGE MEANS WITH SEATING AND UNSEATING THEREOF OVER SAID GROOVE.