UL 1739-2012 pdf download

UL 1739-2012 pdf download.Pilot-Operated Pressure-Control Valves for Fire-Protection Service.
18 Spring Test
18.1 A spring used in a valve mechanism shall operate as intended when tested for 50,000 cycles of operation at a rate of not more man 6 cycles per minute. Each cycle of operation is to consist of a compression of the spring to Its minimum intended operating length (maximum compression during operation) and an extension back to its original length.
18.2 A sample valve into which the cycled spring has been assembled then is to be subjected to at least three point checks from the data generated during the Operation Test, Section 19, and the values obtained shall not differ by more than 10 percent from those obtained with as•received samples.
19 Operation Test
19.1 When tested as described in 19.3— 19.7. a valve shall operate without malfunction and shall perform in accordance with the manufacturer’s specitications throughout the:
a) Rated inlet pressure range;
b) Rated outlet pressure range:
C) Flow range of the valve during the test. and
d) Control the downstream pressure when the valve is closed abruptly in accordance with 19.7 and 19.8.
191 revised Decer’ter 13. 2013
19.2 A single sample is to be used for the operation tests defined in 19.3— 19.8. As a result of the tests, the valve shall show no malfunction or deterioration of performance.
19.3 A valve Incorporating an adjustable speed control device shall operate within time and pressure requirements specified in 19.5 and 19.7 when adjusted to its slowest operating position.
19.4 The inlet of a sample valve is to be connected to a piezometer to which a pressure gauge Is attached and to a water supply that provides the rated inlet pressure and maximum flow required. The downstream side of the sample is to be titled with a piezorneter equipped with a pressure gauge, piping, and a valve to control the water flow through the sample.
19.5 The sample is to be adjusted to a referenced setting yielding the lowest outlet pressure indicated ‘in the installation instructions. The Inlet pressure then Is to be increased to the minimum Inlet pressure recommended by the manufacturer, and the outlet pressure and flow is to be recorded The inlet pressure then is to be increased in 50 psig (345 kPa) increments or less up to me maximum rated inlet pressure. and the outlet pressure and flow is to be recorded at each increment. Also, at each increment, the shutoff valve at the end of the test line that controls the water flow through the sample is to be adjusted to obtain a no (zero) flow condition and other intermediate flow rates up to the maximum rated flow. This procedure then is to be repeated at settings representative of the inlet and outlet ranges recommended by the manufacturer. The recorded outlet pressures at each increment and all flowing conditions shall be within ±10 percent of the referenced outlet setting pressure. Except for the no (zero) flow condition, the time for the valve to return within ±10 percent of the outlet pressure referenced in the manufacturer’s instructions
20.3 Body leakage test
203.1 After completion of the test specified in 20,2.1, the outlet of the sample is to be closed by a cap
o 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 conckicted: 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.