NSF ANSI 359 pdf free download
NSF ANSI 359 pdf free download.Valves for crosslinked polyethylene (PEX) water distribution tubing systems.
3.3 fitting: A piping component used to join, terminate, or provide changes of direction in a piping system. 3.4 plastic: A material that contains as an essential ingredient one or more organic polymeric substances of large molecular weight, is solid in its finished state, and, at some stage in its manufacture or processing into finished articles, can be shaped by flow. 3.5 potable water: Water that is acceptable for drinking, culinary, and domestic purposes and meets the requirements of the health authority having jurisdiction. 3.6 valve: A device used to regulate the flow of liquids or gasses. 3.7 virgin material: A material in the form of pellets, granules, powder, floc, or liquid that has not been subjected to use or processing other than that required for its initial manufacture. 4 Material requirements 4.1 Materials identified below and that meet the minimum requirements are acceptable for use in producing valves which comply with the minimum requirements of this standard. 4.2 Valves shall be made of materials as specified in their respective applicable nationally recognized standards specification as mentioned in section 2 normative references. 4.3 Valves bodies made from copper alloys containing more than 15% zinc by weight and intended for use in potable water systems shall meet the Dezincification and Stress Corrosion Cracking Resistance requirements of NSF/ANSI 14. 4.4 Plastic (non-metal) materials for valves Materials for the valve body shall be produced from virgin plastics or clean rework materials.
The use of clean, rework material of the same formulation and physical properties from the same manufacturer is acceptable provided the finished products meet the requirements of this standard. Materials in the production of valves shall be manufactured in such a way as to prevent contamination. 5 Requirements 5.1 Pressure rating Valves shall have a hydrostatic pressure rating of 100 psi (0.69 MPa) at 180°F (829 C). 5.2 Dimensional requirements of connections Connections shall comply with at least one of the following standards: ASTM D2846. Standard Specification for Chlorinated Poly(Viny/ Chloride) (CPVC) Plastic Hot and Cold Water Distribution Systems5 ASTM F877. Standard Specification for Crosslinked Polyethylene (PEX) Plastic Hot and Cold Water DistributionS ASTM F1807. Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring for SDR9 Cross-linked Polyethylene (PEX) Tubings
5.4.2 Life cycle test Valves shall be subjected to one thousand cycles of operation from the fully opened to the fully closed position at its maximum rated temperature and pressure and a flow of 2.5土0.5 gpm(11.4土2.27 liters/min). Following the life cycle test, the valve shall comply with 5.4.3 – Seat test. 5.4.3 Seat test Valves shall be subjected to a hydrostatic pressure of not less than 100 psi (0.69 MPa) at 180° F (829 C) or the maximum rated pressure and temperature of the valve for a duration of five minutes. The test pressure shall be applied successively on each side of the closed valve for bidirectional valve or in the direction of the flow for unidirectional valve. Any leak shall constitute a failure. 5.4.4 Cv test The Cv value of the valve shall be equal or greater than 95% of the manufacturer’s recommended value. T esting shall be conducted as per ANSI/ISA 75.01.013. 6 Toxicity Valves intended for use in drinking water systems shall meet NSF/ANSI 61.NSF ANSI 359 pdf download.
