Liquatec ProductsAutomatic Shutoff Valves (ASOV)NSF /ANSI STANDARD 58Reverse Osmosis Drinking Water Treatment Systems

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Overview

A. GeneralB. ASOV Process on RO systemC. ASOV usage on RO systemD. Liquatec ASOV specificationE. ASOV StructureF. Cross Section ViewG. ASOV NSF Testing RequirementsH. Liquatec ASOV NSF ListingI. Liquatec ASOV Factory TestingJ. Feed water/ Tank back pressureK. Performance comparison to competitors

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A. GeneralPurpose The ASOV (Auto Shut Off Valve) is a key component used in Reverse

Osmosis (RO) based Point-Of-Use (POU) drinking water treatment systems.

Scope The ASOV ( Auto Shut Off Valve) utilizes a diaphragm between the feed

water and treated water to control the flow of feed water into the treatment system.

NSF/ANSI STANDARD 58

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* Feed water goes through a set of three pre filters (Sediment filter, Carbon filter, Carbon filter), passes through the ASOV and then goes to the RO membrane to produce RO water.

* The RO water passes through the system to be stored in the water tank. When the tank fills with RO water and the tank pressure reach to 40 psi the back pressure will reverse the ASOV diaphragm and will shut off due to the pressure differential.

* When the RO water end pressure is greater than the Feed water pressure, it causes the piston to move downward and shut off the in and out channel.

* When the ASOV In and Out channel shuts off, the system will

not produce any RO water.

C. ASOV usage on RO System

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60psi

40psi

Carbon Filter

SDF FilterCarbon Filter

Shut Off Valve

D. Liquatec ASOV SpecificationOperating pressure: 30 ~ 100 psi

Operating temperature: 120°F (50°C)

Material of Construction

* Body: Polypropylene

* Diaphragm: EPDM

* Screw: SS 304

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E. ASOV Structure

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Screw

Top Case

Upper Diaphragm

Piston

Cradle

Bottom Diaphragm

Bottom Case

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F. Cross Section View

Upper Diaphragm

Piston

Bottom Diaphragm

IN OUT

G. ASOV NSF testing requirements1. Material Safety – Extraction test.

2. Structural Integrity – NSF/ANSI Standard 58 component certification requirements: a. Burst Pressure testing @ 400 psig b. Hydrostatic Pressure test @ 300 psig c. Cyclic Pressure test - 100,000 cycles @ 0 to 150 psig

3. Performance Testing a. Operating Cycle test I. 20,000 cycles to simulate use over a 10 year life II. Utilizes two inlet pressures – 30 psig and 100 psig. III. Utilizes back pressure regulator to simulate increasing back pressure of storage tank. Expect the ASOV to activate at 2/3 inlet line pressure and deactivate at 1/3 line pressure. Accuracy +/- 20% as determined by NSF. b. Leak test I. One Cycle testing is complete the ASOV is tested for 15 minutes at 100 psi to verify that no detectable amount of feed water is leached from the

feed water side to the treated water side over the course of the test.

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H. Liquatec ASOV NSF listing

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I. Liquatec ASOV Factory Testing

Leak Test: 100% leak test on two channel (RO water and feed water) at 150psi pressure

Function Test: feed water pressure at 30psi - 60psi - 90psi, test for system on/off when RO tank increases/decreases pressure

Cyclic Test: pressure 0 ~ 150psi, test for 20,000 times

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Feed water Pressure

(psi)

RO water pressure (psi)

System Off

System On

30 22 12

40 28 14

50 34 16

60 40 19

70 45 22

80 50 24

90 56 30

At Feed Water Pressure 60psi, RO Water Pressure in 40 psi system off.

(Accuracy +/-20%)

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J. Feed water / Tank back Pressure

K. Performance Comparison　 Liquatec Kxxflo

　 　 　

FeedWaterpress

ure

OFF ON OFF ON

30 psi 22 12

Unable

Stop flow

　

60 psi 40 20 33 20

90 psi 58 32 60 31

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For Reference: Comparison other products with Liquatec ASOV testing result