UL-1739:2012 pdf free download – STANDARD FOR SAFETY Pilot-Operated Pressure-Control Valves for Fire- Protection Service.
20.3.1 After completion of the test specified in 20.2.1, the outlet of the sample is to be closed by a cap or the equivalent. The sample then is to be partially opened to allow pressurization of the entire valve body, including the bonnet joint and sealing device, to the rated pressure, and examined for leakage. The sample then is to be pressurized to twice the rated pressure, maintained at that pressure for 1 minute, and examined for leakage during and after pressurization.
20.3.1 revised June 7, 2012
21 Strength of Body Test
21.1 A valve, including trim, shall withstand for 5 minutes, without rupture, an internal hydrostatic pressure of four times the rated pressure.
21.1 revised June 7, 2012
21 .2 During this test, the valve is to be partially open; except that, if testing with the valve partially open is impractical, two tests shall be conducted; first with the inlet pressurized, and then with the outlet pressurized.
21 .3 This test is not to be considered a test for gaskets or seals. A gasket used with a casting or other part having a large area may be reinforced. Other materials that will withstand the pressure may be substituted for the gaskets and seals provided with the valve.
22 One-Year Static Leakage Test
22.1 A valve shall:
a) Withstand for 1 year, without leakage from the outlet, an inlet pressure equal to 25 psig (170 kPa) less than the rated pressure, and
b) After the 1 year exposure, the valve shall not have values that differ by more than 10
percent from those obtained with the as-received valve when subjected to the Operation test,
Section 19.
22.1 revised December 13, 2013
22.2 A sample of the valve is to be filled with water in both the outlet and inlet sides and a pipe plug and pressure gauges are to be attached.
22.2 revised December 13, 2013
22.3 The inlet side of the sample then is to be pressurized to a pressure equal to 25 psig (170 kPa) less than the rated pressure and the outlet side pressure set at the minimum recommended by the manufacturer. After the 1 year period, the sample is to be subjected to at least three flow rates that had been conducted on the as received sample during the Operation Test, Section 19.
22.3 revised December 13, 2013
MANUFACTURING AND PRODUCTION TESTS 23 General
23.1 The manufacturer shall provide the necessary production control, inspection, and tests. The program shall include at least the following:
a) Seat leakage test of each valve at twice the rated pressure. There shall be no leakage at joints or the valve seat;
b) Body leakage test of each valve at twice the rated pressure. There shall be no leakage, deformation, cracks, porosity, or other evidence of weakness; and
c) Operation test of each pilot control valve to verify that the outlet pressure is within ±5 percent of the outlet pressure setting. To conduct the test, the valve is to be set at the outlet pressure marked on the tag specified in 24.3. The inlet pressure then is to be slowly increased to at least 10 psi (68.9 kPa) above the set outlet pressure. The measured outlet pressure shall be within ±5 percent of the outlet pressure setting.
Exception: The test arrangement required by (a), (b), or (c) is not required when other test arrangements which achieve the equivalent results are employed.