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UL 125-2020 pdf free download
UL 125-2020 pdf free download.Flow Control Valves for Anhydrous Ammonia and LP-Gas.
26.7 The seat of the back-pressure check valve used in the assembly of a vapor return valve, when In the dosed position, shall be free from leakage at any aerostatic pressure between:
a) 69 and 2.588 kPa (10 and 375 psig), or
b) 69 kPa (10 psig) and 1.5 times the rated service pressure of the valve, whichever is greater.
26.8 Seat leakage tests shall be conducted in accordance with 269 — 26.13. based on the design of the valve. A positive shutoff valve and a pressure-measuring device that complies with 22.6 are to be installed in the pressure supply piping. The pressure-measuring device is to be installed between the shutoff valve and the sample under test. While under the applied aerostatic test pressure, observations for leakage are to be made with the open port submerged in water unless otherwise indicated.
26.9 Seat leakage test for a shutoff valve is conducted with the inlet of the sample valve connected to a source of aerostatic pressure, with the valve in the dosed position, and with the outlet open.
26.10 Seat leakage test for an internal valve is conducted with the source of pressure applied to the container portion of the valve with the valve member in the closed position and the inlet open.
26.11 Seat leakage test for a back-pressure check valve is conducted with the source of pressure applied in the reverse flow direction.
26.12 Seat leakage test for the back-p-essure check valve portion(s) of a filler valve that is constructed in accordance with 15.1 (a) or (e) shall be conducted in two parts. Each back-pressure check valve shall be tested individually, with the other check valve either removed or blocked in an open position. The upper check valve shall comply with 26.6. The lower check valve shall comply with 26.5.
26.13 Seat leakage test for the shutoff valve portion of a filler valve that is constructed in accordance with 151(e) shall be conducted in two parts. The first part shall be conducted with the pressure applied in the flow-into-the-container direction, with the valve in a closed position. Leakage shall be observed at the pipe connection port at a pressure not exceeding 862 kPa (125 psig). The second part of the test shall be conducted with the pressure applied in the flow-out-of-the-container direction: with the valve in a dosed position and with the check valves either removed or blocked in an open position. The valve shall comply with 262 for this second part of the test.
26.14 Compliance with 63 and is to be determined by connecting a length of tubing to the valve outlet. The open end of this outlet tube is to be located within an inverted graduated cylinder which is calibrated in cc (cubic centimeters). The inverted cylinder is to be closed by a water seal. The apparatus is to be adjusted so that:
a) The end of the outlet tube is located 12.7 mm (0.5 in) above the water level within the inverted graduated cylinder, and.UL 125-2020 pdf free download.
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