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Flow Restrictors

AMI Flow Restrictors for Home RO Systems
Designed for use in residential reverse osmosis systems to restrict the flow on the drain (reject) line, keeping the membrane pressurized and controlling the recovery ratio of the system. The flow restrictor must be properly sized according to the flow of the RO membrane system. The recommended sizes per flow rate are listed in the below tables.

It is recommended that the flow restrictor is replaced each time an RO membrane is replaced in order to keep your system working at optimum performance, as scale build up can occur and clog the capillaries. Additionally, if changing to a different flow-rate membrane element, the flow restrictor must be changed to the appropriate size as well.

Available in several styles including encapsulated capillaries (in both quick connect and male threaded end connections) and inserts for use in fittings. Encapsulated capillary style flow restrictors should be installed in the membrane reject line between the housing outlet and the drain. Insert style flow restrictors should be inserted in the fitting between the membrane housing reject outlet and the tubing that leads to the drain.

Encapsulated Capillary Flows Restrictors with Quick Connect End Connections

¼” QC Tube Fittings

Quick Connect Flow Restrictors for Home RO
Model No. Restrictor Flow
(mL per Minute)		 Recommended For Membrane (GPD)
H-R2051QC 150 10
H-R2052QC 200 16
H-R2061QC 250 18
H-R2062QC 300 24
H-R2063QC 350 30
H-R2064QC 420 36
H-R2068QC 600 50/55
H-R2074QC 650 55
H-R2071QC 750 65
H-R2069QC 850 75
H-R1000QC 1000 100
Encapsulated Capillary Flows Restrictors with Male Threaded End Connections

¼” Male NPT Threads.
Requires ¼” FNPT compression nut (sold separately)

Male Threaded Flow Restrictors for Home RO Systems
Model No. Restrictor Flow
(mL per Minute)		 Calibrated For Membrane (GPD)
H-R2051M 150 10
H-R2061M 250 18
H-R2064M 420 36
H-R2065M 550 50
H-R2069M 850 75
F-1050-004 Nut for M Flow Restrictor ¼” FNPT
Insert-Style Flows Restrictors

For use with a ⅛” Male Fitting (sold separately)

Flow Restrictor Inserts for Home RO Systems
Model No. Restrictor Flow
(mL per Minute)		 Calibrate For Membrane (GPD)
H-R2066 300 24
H-R2087 350 30
H-R2067 400 35
Flows Restrictor Insert in Fitting

AMI flow restrictor insert pre-installed into a ¼”T x ¼”M NPT AMI Quick Connect Elbow Fitting

Flow Restrictor Elbows for Home RO Systems

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Model No. Restrictor Flow
(mL per Minute)		 Calibrate For Membrane (GPD)
H-R2057QC 250 18
H-R2087QC 350 30
H-R2067QC 400 35