Compressed air loss preventing system - increases oil volume between pneumatic and hydraulic pistons, reducing pneumatic clearance volume

摘要

The process avoids the loss of compressed air, and consequently of power, corresp. to the clearance volume of a pneumatic cylinder, the latter being used to actuate a hydraulic one. The volume of oil between the hydraulic and pneumatic pistons is increased in such manner as to bring the latter piston close to the cylinder cover. Where the pneumatic cylinder slides on the piston and actuates a tappet, it is brought into a position where piston and cover touch. Pref. a third cylinder is coupled, via a stop valve, to the hydraulic cylinder chambers. The third cylinder volume can be reduced by a floating piston to zero value.