Abstract: A double-acting pressure intensifying cylinder and method, wherein a first cylinder a second cylinder are connected via an operation chamber in series. The first fluid chamber is provided with a first piston and the second fluid chamber is provided with a second piston. In an operation chamber, a rod is slidably inserted. The first fluid chamber has a first fluid supply port and an air port, the second fluid chamber has a third fluid supply port and a fourth fluid supply port, the operation chamber has a second fluid supply port. A check valve is provided wherein the series connected first and second cylinders at a position closer to the second cylinder than to the second fluid supply port in the operation chamber and makes it possible for a fluid such as a hydraulic fluid to flow only in one direction from the operation chamber to the second cylinder.

Abstract: An offer of a double-acting pressure intensifying cylinder and method for intensifying pressure in the cylinder that the adjustable pressure-intensified stroke can be obtained, larger driving force can be obtained, downsizing of cylinders is attained, simple structure makes it possible to be inexpensive and to reduce the rate of the occurrence of trouble such as breakdown. In a double-acting pressure intensifying cylinder 30, a first cylinder 10 and a second cylinder 20 are connected via an operation chamber 14 in series. The first fluid chamber 11 is provided with a first piston 12 and the second fluid chamber 21 is provided with a second piston 22. In an operation chamber 14, a rod 13 is slidably inserted. The first fluid chamber 11 has a first fluid supply port 1 and an air port 5, the second fluid chamber 21 has a third fluid supply port 3 and a fourth fluid supply port 4, the operation chamber 14 has a second fluid supply port 2.