Performance Requirements for Temperature Actuated, Flow Reduction (TAFR) Valves for Individual Supply Fittings
|Publication Date:||1 October 2017|
Devices covered by this standard shall be mechanically or electrically operated, and shall be installed in-line with, or integrated into, supply fittings. These devices shall automatically reduce flow within five (5) seconds to 0.25 GPM (0.95 L/min) or less at 80.0 psi (551.6 kPa) in response to outlet temperatures greater than a preset actuation temperature, not to exceed 120.0 °F (48.9 °C), so as to limit exposure to high temperature water discharged from an individual supply fitting.
After actuation, the reset open temperature shall not be less than 90.0 °F (32.2 °C) and shall reset open automatically, or with the use of a manual reset mechanism.
Sizes of the devices covered by this standard shall be 1 inch NPS (25 DN) or smaller.
Flow Rates Before Actuation
a) When the device is integrated into a supply fitting, the flow rate of the assembly prior to actuation shall be in accordance with ASME A112.18.1/CSA B125.1.
b) For devices not integrated into a supply fitting, but are to be used with a supply fitting that has a specified minimum flow rate in the ASME A112.18.1/CSA B125.1, the minimum flow rate prior to actuation shall be at least 0.5 GPM (1.9 L/min) greater than the applicable ASME A112.18.1/CSA B125.1 requirement. If the device is to be used with a supply fitting that has a specified maximum flow, no other maximum flow requirement shall be necessary unless the device is used to limit flow.
The maximum working pressure of the device shall be at least 125.0 psi (861.9 kPa).
The device's working temperature range shall be 37.0 °F to 180.0 °F (2.8 °C to 82.2 °C).