PRINCIPAL OF OPERATION
Water is admitted to the main cylinder (3) at 90 psi via the control valve (2) lifting the main piston and the rods. As the crosshead rose, it made contact with the upper lever which in turn moved the small piston rod and pistons in cylinder (4) upwards allowing low pressure water to act on the underside of piston (6) forcing it up. This also raised piston (7) and the cut off valve (8).The used water in the cylinder above piston (7) was forced out through the bottom of cylinder (4) to drain away. With the main water supply cut off and the exhaust (12) open, the weight of the piston and the rods forced the water out of the main cylinder to drain away through (12). As the piston rod dropped, the crosshead made contact with the bottom lever which in turn pulled down the rod linkage and small pistons in cylinder (4) to allow low pressure water to act upon piston (7). At the same time, piston (6) was pulled down forcing used water out of the cylinder via the exposed route in cylinder (4) and the cut off valve (8) was moved to block the exhaust pipe (12). Water was once again able to freely enter the main cylinder and the cycle was repeated.