Reverse osmosis unit
AssigneeParker-Hannifin Corporation
InventorsPaul Kamel, Kelly Sullivan, Steven T. Yoshimura, Bruce Worsley, Salvador Lopez
Life of this patent
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Abstract
An energy recovery system for use in a reverse osmosis system is provided. The energy recovery system has a pair of double headed pistons that reciprocate to pressurize unfiltered water into a reverse osmosis filtration unit. High pressure wastewater from the reverse osmosis filtration unit is used in conjunction with a pump to pressurize the unfiltered water that is pumped to the reverse osmosis filtration unit.
Claims18
A reverse osmosis energy recovery system comprising:
- a first piston having a first piston head and a second piston head connected to the first piston head, the first and second piston heads each having a pump side and a wastewater side;
- a second piston having a third piston head and a fourth piston head connected to the third piston head. the third and fourth piston heads each having a pump side and a wastewater side;
- a pump water conduit for supplying water from a pump to the pump side of the first, second, third and fourth piston heads;
- a wastewater conduit for supplying pressurized wastewater from a reverse osmosis filter arrangement to the wastewater side of the of first, second, third and fourth piston heads;
- a release valve having:
- a valve body having a pump water inlet port in fluid communication with the pump water conduit, a wastewater inlet port in fluid communication with the wastewater conduit, and a drain port;
- a valve member within the valve body movable between a first position in which fluid is prevented from flowing from the wastewater inlet port to the drain port and a second position in which fluid is permitted to flow from the wastewater inlet port to the drain port.
A reverse osmosis energy recovery system comprising:
- a first piston having:
- a first piston head and a second piston head connected to the first piston head, the first and second piston heads each having a pump side and a wastewater side;
- first and second piston rods connecting the first piston head to the second piston head, each of the first and second piston rods having opposed, spaced apart first and second cylindrical portions and a reduced diameter region interposed between the first and second cylindrical portions, the reduced diameter region having a maximum diameter of between 0.385 and 0.395 inches.
The reverse osmosis energy recovery system of claim of 9, wherein a first intersection between the first cylindrical portion and the first transition region is spaced apart along a longitudinal axis of the piston rod a length of between 0.651 and 0.675 inches from a second intersection between the second cylindrical portion and the second transition region.
Dependencies are inferred from the claim text.