Patent ID: 8449771

Claim:
A reverse osmosis system to treat water, said reverse osmosis system comprising: a reverse osmosis assembly having a reverse osmosis membrane to which water is delivered, an inlet via which feed water is delivered to the assembly, a first outlet to which product water is delivered, and a second outlet to which water that has passed said reverse osmosis membrane is delivered; and a pump assembly operatively associated with said reverse osmosis assembly to deliver the feed water thereto and to receive the water from said second outlet, said pump assembly having a first pump and a second pump, each of said pumps comprising: a bore having a longitudinal axis and surrounding a chamber; a first partition member extending longitudinally of said chamber; a second partition member also extending longitudinally of said chamber and moveable relative to said first partition member, and dividing said chamber into a first sub chamber and a second sub chamber; a shaft attached to said second member to cause angular movement thereof about said longitudinal axis to change the volumes of said first and second sub chambers; ducting communicating with said first and second sub chambers to provide for the flow of water with respect thereto as the volumes are varied; a valve connected to said reverse osmosis assembly and said pump assembly to provide for a flow of water therebetween; a feed water pump to deliver said feed water at a desired pressure and volume into a closed loop of said first and second pumps and said reverse osmosis assembly; and a further feed water pump to deliver said feed water at a desired pressure to said inlet of said reverse osmosis assembly, as well as said feed water pump; wherein said shaft of said first pump is coupled to said shaft of said second pump so that said second partition member of said first pump angularly oscillates in phase with said second partition member of said second pump.