Compression Fittings / Media Assembly Instructions for Compression Fittings Compression fittings are produced in high quality brass. As any copper-based material, brass is potentially subject to stress corrosion cracking. When compression fittings are used in cooling systems, this risk for stress corrosion cracking may be higher than in heating applications. This is due to the development of moisture that can contain some amount of ammonia or its derivates. The following good-installation practice shall be used when installing compression fittings in cooling systems in order to eliminate or, at least, to minimize the risk for stress corrosion cracking: • Lubricate the compression fitting before installation. • Only use box spanners during installation. • Tighten first by hand and then with a box spanner. Do 134 not overtighten. Spanner tightening as per the table below. • After the compression fitting is tightened, wrap it by using an ”ammonia-free” impervious tape. This will protect the nut against moisture. Please, consider that certain insulation materials develop ammoniacal derivatives - contact the manufacturer of the insulation material when in doubt. Soft pipes are to be fitted with a support sleeve. • Soft copper and steel pipes = Use a type SC support sleeve • PEX pipes = Use a type WP support sleeve. For fitting with reduction 68: First tighten the nut until the chamfer “fails” and a “crack” is heard. Then tighten the nut further until a light resistance is felt, plus number of turns as per the table value corresponding to the reduced dimension. The reduction is not intended to be used on PEX pipes. Tightening - Number of Turns Outer Diameter Copper Pipe Soft Steel Pipe Stainless Steel Pipe Plastic Pipe Spanner Flat Width 8 1¼ ¾ ¾ 16.0 10 1¼ ¾ ¾ 2 18.3 12 1¼ ¾ ¾ 2 20.5 15 1¼ ¾ ¾ 1¼ 24.5 16 1¼ ¾ ¾ 1¼ 25.6 18 1¼ ¾ ¾ 1¼ 27.6 22 1 ¾ ¾ 1½ 32.8 28 ¾ ¾ ½ 1½ 39.2 35 ¾ ½ ½ 46.9 42 ¾ ½ ½ 55.0 54 ¾ ½ ½ 70.2 Media The Kvs values read from the capacity diagrams in this product catalogue are valid when water is the medium. The addition of glycol affects the viscosity and the heat transfer coefficient which should be taken into account when selecting valve dimension. For mixtures with 30-50% glycol a valve with the nearest higher Kvs value should be selected.
LK Armatur - Produktkatalog 2014 ENG
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