Hydrualic pressure amplifier

A hydraulic pressure amplifier comprising:

• a cylinder provided at opposite ends with plunger chambers of smaller cross section and said cylinder and coaxial therewith;
• a piston displaceable in said cylinder and formed at opposite ends with respective plungers extending respectively into said plunger chambers and lying along the axis of said piston, said piston being stepped and defining in said cylinder a first annular chamber of relatively smaller effective cross section continuously connected to a source of a primary fluid under pressure, and a second annular chamber of large effective cross section;
• a pilot valve formed with a valve member differentially displaceable and connected with said second annular chamber for alternately connecting same with said source and with a return passage for said primary fluid;
• means forming a single pilot passage communicating with said cylinder at an orifice disposed at an intermediate location along the length of said cylinder and alternately uncovered and blocked by said piston, said pilot passage being connected to said pilot valve to control the fluid pressure differential displacement of said valve member;
• and
• respective check valves allowing a secondary fluid to be induced into said plunger chambers and driven therefrom at high pressure.