ASME A112.18.8:2020 pdf free download

ASME A112.18.8:2020 pdf free download
ASME A112.18.8:2020 pdf free download.Sanitary Waste Valves for Plumbing Drainage Systems
3.2 One-Way Sealing Performance of the Valve
3.2.1 Test Apparatus. The test apparatus is as follows:
(a) length of 1 ∕4 in. (6 mm) bore rubber tubing
(b) tee-junction suitable for use with the rubber tubing
(c) u-tube manometer with a range of 0 in. (0 mm) to 6 in. (152 mm) of water, gage
(d) reducer to enable the rubber tube to be connected to the outlet of the valve
3.2.2 TestMethod. Prime the valve byrunningagallonofwaterthroughthe valve to waste. Connecttherubbertubing through the reducer to the outlet ofthe valve. Connect the other end ofthe tube to the tee-junction, one leg ofwhich is connectedtotheu-tubemanometerandtheremaininglegtoanotherlengthoftubing. Applyairpressuretothefreeendof the tubing until a pressure of4 in. (102 mm) ofwater, gage, is registered on the u-tube manometer. Clamp the end of the tubeand maintain pressure for 20 sec. Release the pressure and leave thevalve and equipment insitu for a minimum of 48 hr, then retest under the same conditions but omit the water priming stage. 3.2.3 Performance Requirements. The valve shall retain a seal undera backpressure, equivalentto 4 in. (102 mm) of water, gage, for 20 sec on both the initial test (with valve primed) and the retest.
3.4.1 Test Method. Fit the valve to be tested to a standard sink and connect the arrangement ofpipe work shown in Figure 3.4.1-1 to the outlet ofthe valve. Close valve at point B. Slowly open valve C until the bladder inverts and water flows into the sink. Record the pressureat the point of inversion. Close valve C; open valve B.Insert the sink plug and fill the sink with water to level A.
NOTE: Failure of the bladder to invert shall not constitute a failure of the test or a reason to stop the test.
3.4.2 Performance Requirements. When the sinkplug is removed, the sinkshall completely drain. Atthe completion ofthe testinpara. 3.4.1, the valve shall be testedinaccordance with paras. 3.1 and3.2. Failureto achieve the performance parameters prescribed in paras. 3.1 and 3.2 shall be cause for rejection of the valve.