NSF ANSI 359-2018 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 substancesof large molecular weight, is solid in its finished state, and, at some stage in its manufacture or processinginto finished articles, can be shaped by flow.
3.5 potable water: Water that is acceptable for drinking, culinary, and domestic purposes and meets therequirements 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 beensubjected to use or processing other than that required for its initial manufacture.
4Material requirements
4.1 Materials identified below and that meet the minimum requirements are acceptable for use in producingvalves which comply with the minimum requirements of this standard.
4.2 Valves shall be made of materials as specified in their respective applicable nationally recognizedstandards 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 usein potable water systems shall meet the Dezincification and Stress Corrosion Cracking Resistancerequirements 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 samemanufacturer is acceptable provided the finished products meet the requirements of this standard. Materialsin 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(82°C).5.2 Dimensional requirements of connections
Connections shall comply with at least one of the following standards:
-ASTMD2846.Standard Specification for Chlorinated Poly(Vinyl Chloride)(CPVC)Plastic Hot andCold Water Distribution Systems5
-ASTM F877.Standard Specification for Crosslinked Polyethylene(PEX) Plastic Hot and ColdWater Distribution5
ASTM F1807.Standard Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring forsDR9 Cross-linked Polyethylene (PEX) Tubing-
– ASTM F1865. Standard Specification for Mechanical Cold Expansion Insert Fitting withCompression Sleeve for Cross-linked Polyethylene (PEX) Tubing
—ASTM F1960.Standard Specification for Cold Expansion Fitting with PEX Reinforcing Rings forUse with Cross-linked Polyethylene (PEX) Tubing
– ASTM F1961.Standard Specification for Metal Mechanical Cold Flare Compression Fittings withDisc Spring for Cross-linked Polyethylene(PEX) Tubing
— ASTMF2080. Standard Specification for Cold-Expansion Fittings with Metal Compression-Sleevesfor Cross-Linked Polyethylene(PEX) Pipe
—ASTM F2159.Standard Specification for Plastic Insert Fittings Utilizing a Copper Crimp Ring forsDR9 Cross-linked Polyethylene (PEX) Tubing
—ASTM F2434.Standard Specification for Metal lnsert Fittings Utilizing a Copper Crimp Ring forSDR9 cross-linked Polyethylene(PEX) Tubing and SDR9 Cross-linked Polyethylene/Aluminum/Cross-linked Polyethylene (PEx-AL-PEx) Tubing
— ASTM F2735.Standard Specification for Plastic Insert Fittings for SDR9 Cross-linked Polyethylene(PEX) and Polyethylene of Raised Temperature (PE-RT)Tubing
– ASSE 1061.Performance Requirements for Removable and Non-Removable Push-Fittings5.3 End connections (valves intended for joining PEX piping systems to systems other than PEX)5.3.1 Threads
Tapered metal threads shall meet the requirements of ASME B1.20.14.Tapered plastic threads shall meet the requirements of ASTM F14985.Non-tapered threads shall meet the requirements of ASME A112.18.14.5.3.2Sweat ends
Sweat ends shall meet the requirements of ASME B16.22.45.3.2.1 CPvc cTs sockets
cPvc CTs sockets shall meet the requirements of ASTM D2846.5
5.4 Performance requirements of valves
Valves shall meet the applicable requirements of ASTM F8775.5.4.1Valves with plastic insert fittings
Valves with plastic insert fittings covered by the scope of ASTM F2735 or F2159 shall meet the insert crushtest as per ASTM F2735 or F2159.NSF ANSI 359 pdf download.