Pressurized SpheresEach unit separates into halves. They screw together to form a solid unit that has a perfectly spherical cavity inside. A hemispherical rubber bladder conforms to one half of the cavity, secured in the seam between the two halves. The cavity is then completely charged with compressed nitrogen creating a very stable pressurized environment. (Note: more modern sphere units to not unscrew into halves, but were maufactured as integrated units) Hydraulic fluid can enter the unit through an orifice below the bladder. As a quantity of fluid is pressed into the cavity, the rubber bladder is forced upward further compressing the nitrogen gas. When pressure outside the unit decreases, the quantity of fluid will be forced back out of the cavity as the compressed nitrogen again attains equilibrium.
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