ASSE 1002

Abstract

<strong>Description</strong> <br>These devices are cold water supply valves that are installed within water closet tanks to provide tank refill and a trap reseal after flushing a water closet. They are equipped with backflow prevention devices or an air gap. <br><strong>Working Pressure</strong> <br>The device shall be designed to operate at a minimum pressure range of 20.0 psi to 125.0 psi static (137.9 kPa to 861.9 kPa). <br><strong>Capacity Total Fill and Refill</strong> <br><strong>Original Equipment Manufacturer</strong> <br>When the device is furnished as original equipment with a manufacturer's water closet, the total flow capacity shall be sufficient to assure proper operation of the fixture in accordance with the performance standard, ASME A112.19.2. The device shall deliver a fill rate through the refill orifice as required by the water closet manufacturer. <br><strong>Retrofit Use</strong> <br>When the device is furnished to retrofit water closets, the device shall deliver a minimum flow rate at 15.0 psig (103.4 kPa) flowing pressure of 1.5 GPM (5.7 L/min), and a minimum refill flow rate, through the refill orifice, of 20% of the total fill rate at 15.0 psi (103.4 kPa) flowing pressure. <br><strong>Leakage and Spray Containment</strong> <br>The device shall not spray or otherwise leak water to the outside of the water closet tank during operation. <br><strong>Backflow Prevention</strong> <br>The device shall be equipped with a means to prevent backflow due to back siphonage. Air inlet ports shall be protected in such a manner as to reduce the risk of the intake of foreign material into the device. <br><strong>Refill Tube</strong> <br>A means shall be provided to secure the refill tube in its installed position. <br><strong>Dimensional Criteria for Fill Valve Components</strong> <br>Dimensions for shanks, coupling nuts and locknuts shall be as shown in Figure 1. Thread dimensions shall be 15/16-14 UNS-1 per ASME/ANSI B1.1. See Appendix A.