Use and Care Manual

ASME A112.18.1-2018/CSA B125.1-18 Plumbing supply fittings
July 2018 © 2018 Canadian Standards Association
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Automatic compensating valve — a water-mixing valve that is supplied with hot and cold water and
that provides a means of automatically maintaining the water temperature selected for an outlet.
Note: Automatic compensating valves are used to reduce the risk of scalding and thermal shock.
Backflow — a flowing back or reversal of the normal direction of flow.
Note: Back siphonage and back pressure are types of backflow.
Backflow prevention device — a mechanical device, whether used singly or in combination with other
devices, that automatically prevents reversal of water flow in a water system due to back pressure or
back siphonage.
Back pressure — pressure higher at the downstream or outlet end of a water system than at a point
upstream.
Back siphonage — backflow caused by below-atmospheric pressure in the water system.
Body spray — a shower device for spraying water onto a bather other than from the overhead position.
Note: An example is a device mounted on a wall below the bather’s head that sprays water in an approximately
horizontal direction and can be fixed or allowed to swivel on a ball joint.
Commercial pre-rinse spray valve — a hand-held self-closing fitting that is used to spray water on
dishes, flatware, and other food service items for the purpose of removing food residue before cleaning
the items.
Critical level (CL) — the lowest water level in a fitting at which back siphonage will not occur.
Cross-flow — the exchange of water from one supply to the other without water flowing through the
mixing valve outlet(s).
Defect —
Blister — a dome-shaped defect resulting from loss of adhesion between layers or between one or
more layers and the substrate.
Crack (as applied in coatings evaluation) —
a) a separation in a coating layer that extends down to the next layer or to the substrate in a
coating that has lost its adhesion; or
b) any indication of a crack (e.g., white deposits or corrosion) that results from performance tests,
allows penetration through a plating layer, and did not appear on the surface or part before
performance testing.
Note: Coating surface deformations that appear after performance testing (e.g., stretch marks, flow lines
under the coating, or deformations caused by stress relieving of the substrate) and do not separate, peel, or
come loose are not considered cracks.
Pit — a small depression or cavity.
Surface defect — a pit, blister, crack, peeling, wrinkling, corrosion, or exposure of the substrate
visible to the unaided eye at normal reading distance.
Note: “Unaided eye” includes vision assisted by corrective lenses normally worn by the person inspecting a
device for surface defects.
Diverter — a device that is integral to a fitting or that functions as an accessory and is used to direct the
flow of water from a primary outlet to one or more secondary outlets.