Importance

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Abstract

Apparatus for supplying high pressure hydraulic fluid to a hand tool comprises an intensifier having a first relatively large diameter pneumatic cylinder and a second relatively small diameter hydraulic cylinder containing hydraulic fluid. A first piston is operatively positioned in the pneumatic cylinder and mechanically coupled to a second piston operatively positioned in the hydraulic cylinder. An air switching valve is connected between a source of pressurized air and the pneumatic cylinder and has a first air outlet port connected to a first end of the pneumatic cylinder and operative in a pressurizing mode for supplying air pressure to drive the first piston in a direction to pressurize the hydraulic fluid. The valve also has a second air outlet port connected to a second end of the pneumatic cylinder and operative in a depressurizing mode for supplying air for retracting the first piston and depressurizing the hydraulic fluid. A pressure responsive valve is coupled for sensing pressure of the hydraulic fluid and responsive thereto for affecting switching of the switching valve from the pressurizing mode to the depressurizing mode when the pressure of the hydraulic fluid reaches a preselected value.

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First Claim