UL 193:2016 pdf download.Alarm Valves for Fire-Protection Service.
7 Sizes
7.1 Valve sizes refer to the nominal diameter of the waterway through the inlet and outlet connections and to the nominal pipe size for which the connections are intended. The diameter of the waterway at the water seat ring of a valve may be reduced to less than that of the waterway at the inlet and outlet connections.
8 Working Pressures
8.1 An alarm valve shall be constructed for a minimum rated working pressure of 175 peg (1200 kPa).
9 Positions
9.1 An alarm valve may be constructed to operate when installed in only one specific position (horizontal Only or vertical only) or it may be constructed to operate in both of these positions. See 31.2(e). for marking requirements.
10 Bodies and Covers
10.1 A body and cover shall be made of a material having corrosion resistance equivalent to cast iron. It nonmetallic materials, for example, plastics, are used, they are to be subjected to a design study to evaluate their resistance to external fire exposure and thermal shock.
10.2 A casting shall not be plugged or lilled but may be impregnated to remove porosity.
10.3 The dimensions of all flanges. flange pipe joints, and threaded body openings shall conform to the following standards, as applicable. The flange class shall be at least equal to the rated working pressure of the valve.
7.1 Valve sizes refer to the nominal diameter of the waterway through the inlet and outlet connections and to the nominal pipe size for which the connections are intended. The diameter of the waterway at the water seat ring of a valve may be reduced to less than that of the waterway at the inlet and outlet connections.
8 Working Pressures
8.1 An alarm valve shall be constructed for a minimum rated working pressure of 175 peg (1200 kPa).
9 Positions
9.1 An alarm valve may be constructed to operate when installed in only one specific position (horizontal Only or vertical only) or it may be constructed to operate in both of these positions. See 31.2(e). for marking requirements.
10 Bodies and Covers
10.1 A body and cover shall be made of a material having corrosion resistance equivalent to cast iron. It nonmetallic materials, for example, plastics, are used, they are to be subjected to a design study to evaluate their resistance to external fire exposure and thermal shock.
10.2 A casting shall not be plugged or lilled but may be impregnated to remove porosity.
10.3 The dimensions of all flanges. flange pipe joints, and threaded body openings shall conform to the following standards, as applicable. The flange class shall be at least equal to the rated working pressure of the valve.
