NSF/ANSI 359-2011

The purpose of this Standard is to establish minimum physical and performance requirements for valves for crosslinked polyethylene (PEX) water distribution tubing systems. These criteria were established for the protection of public health and the environment.

The physical and performance requirements in this standard apply to in line-valves for use in radiant heating system and hot and cold water cross linked polyethylene (PEX) distribution systems which are compliant with the requirements identified in ASTM F877 for PEX tubing systems. Valves meeting these requirements are rated for a minimum 100 psi at 180 F. This standard is supplemental to ASTM F877 and is intended to identify additional requirements specific for valves. The components covered by this standard are intended for use in residential and commercial, hot and cold, potable water distribution systems as well as sealed central heating, including under-floor heating systems.