ISO 6182-16:2020 pdf download – Fire protection — Automatic sprinkler systems — Part 16: Requirements and test methods for fire pump relief valves.
4.8 Leakage and deformation (see 6.3) 4.8.1 There shall be no leakage, permanent distortion or rupture of a valve body when tested in accordance with 6.3.1. 4.8.2 There shall be no leakage of the sealing assembly when tested in accordance with 6.3.2. 4.9 Non-metallic components (excluding gaskets, diaphragms, seals and other elastomeric parts) 4.9.1 Non-metallic valve parts that affect proper valve function shall be subjected to the applicable ageing of their non-metallic parts, as described in 6.5 and 6.6, using separate sets of samples, as applicable. After ageing, a valve shall meet the requirements of 4.8, 4.13 and 4.14 when tested in accordance with the applicable tests described in 6.3, 6.9 and 6.10. 4.9.2 There shall be no cracking, warping, creep or other signs of deterioration that can prevent proper operation of the valve. 4.10 Sealing assembly elements (see 6.7) A seal made of elastomeric or other resilient materials shall not adhere to the mating surface when tested in accordance with 6.7. Where the same design of seat is used for more than one size of valve, it shall be permitted to only test the size with the highest stress on the seating surface. 4.11 Clearances The clearance between a valve disc or a part attached thereto and the inside walls of iron body castings in every position of the valve disc, except fully open, shall be not less than 12,7 mm. This clearance shall be not less than 6,4 mm for valves with bodies of bronze or equivalent corrosion resistant materials. 4.12 Operation and reseat (see 6.8) The pressures at which the main valve opens, shall be not less than the set pressure nor more than 105 % of the set pressure when tested in accordance with 6.8.
4.13 Flow capacity (see 6.9) For set pressures of 0,69 MPa (6,9 bar) and higher, the value of flow specified in Table 1 shall require an inlet pressure at the valve no greater than 125 % of the set pressure when tested in accordance with 6.9. If the valve is tested with a flow capacity less than the values specified in Table 1, the valve shall be marked to indicate the maximum flow intended as per 7.3, j).