Piping arrangement for a water purification apparatus

A piping arrangement for a reverse osmosis (RO) water purification apparatus, comprising:

• a raw water inlet pipe, with an outside end in fluid communication with a raw water source, said raw water inlet pipe provided with a solenoid valve along its length;
• a first manifold having an inner hollow forming a plurality of fluid conduits between:
• a raw water intake;
• a return loop intake;
• a recirculation intake;
• and a pump outlet, said raw water intake in fluid communication with an inside end of said raw water inlet pipe, and a conductivity sensor provided along a said fluid conduit that is adjacent to said pump outlet;
• a pump outlet pipe with an inside end in fluid communication with said pump outlet, and an outside end in fluid communication with an input of a main pressure pump;
• a water return inlet pipe with an outside end in fluid communication with a return pipe of an external use;
• a second manifold having an inner hollow forming a fluid conduit between:
• a return loop inlet and a return loop outlet;
• a joining pipe located between the said return loop outlet in the said second manifold and the said return loop intake of said first manifold for providing a flow of fluid from the said second manifold to the said first manifold, said joining pipe provided with a first non-return valve that prevents fluid from flowing in a reverse direction;
• a pump inlet pipe with an outside end in fluid communication with an output of said main pressure pump;
• a third manifold having an inner hollow forming a fluid conduit between:
• a pump inlet and a membrane outlet, said pump inlet in fluid communication with an inside end of said pump inlet pipe;
• a membrane outlet pipe with an inside end in fluid communication with said membrane outlet, and an outside end in fluid communication with a high pressure side of a reverse osmosis membrane;
• a permeate inlet pipe, with an outside end in fluid communication with a low pressure side of said reverse osmosis membrane;
• a fourth manifold having an inner hollow forming a fluid conduit between:
• a permeate inlet and a permeate outlet, having along said fluid conduit, a flow sensor and a pressure sensor, said permeate inlet in fluid communication with an inside end of said permeate inlet pipe;
• a permeate outlet pipe with an inside end in fluid communication with said permeate outlet, and an outside end in fluid communication with a delivery network for an external use;
• a concentrate inlet pipe having an outside end in fluid communication with a high pressure side of said reverse osmosis membrane;
• a fifth manifold having an inner hollow forming a plurality of fluid conduits between:
• a concentrate inlet, a recirculation outlet and a concentrate outlet, said concentrate inlet having adjacent to it a conductivity sensor and a temperature sensor, and said concentrate outlet having adjacent to it a flow sensor and a concentrate flow control valve;
• a recirculation pipe having a first end in fluid communication with said recirculation intake of first manifold and a second end in fluid communication with said recirculation outlet for fifth manifold;
• a concentrate outlet pipe with an inside end in fluid communication with said concentrate outlet of said fifth manifold, and an outside end in fluid communication with a drainage outlet, said drainage outlet in fluid communication with an external means of disposal.