Gas cylinder with a double jacket

Double liner gas cylinder comprising

• an internal gas cylinder having a concentric outer tube and inner tube with a space for gas to pass between two internal cambers separated by a piston operating inside the inner tube, the gas cylinder being provided with a valve cap formed by two parts, a valve shaft, a shaft cap and a shaft linked to the piston and also having an outer bushing which surrounds the gas cylinder, the outer tube fits inside a longer straight walled tube, within said straight walled tube having a cylindrical portion also straight walled which is longer than the outer tube and is open at its ends, with the end formed as a tapered conical section, being the outer tube positioned by inserting the end of the valve shaft up to the start of said conical section and being the outer tube held in position by three grooves spaced at 120° from each other near the end where the end is a raised area that increases surface contact with the bushing when the shaft is fully extended, a tube limiter being housed inside a tapered conical action of the straight walled tube and, in turn, housing a pusher connected to a projecting end of the gas cylinder valve shaft, being the tube limiter provided with evenly-spaced ribs, the valve cap housed inside the outer tube being held in place by an outer washer that holds a ring seal in place, with the washer housed in a ring-shaped groove formed on the end of the valve cap.