Selection requirements for refrigeration piping parts of chillers

Selection requirements for refrigeration piping parts of chillers

The accessories of the refrigeration pipeline of the chiller mainly include various valves and connectors. According to different refrigeration systems, chillers have different requirements for piping accessories. If the refrigeration piping accessories are selected incorrectly, or the installation does not meet the requirements, it will directly affect the cooling effect of the chiller.

　　 One, valve

　　Various valves should adopt special products that conform to the refrigerant. The valves used in the ammonia system chiller should meet the following requirements:

　　 1. The valve body is gray cast iron, temperable iron or cast steel. The strength test pressure is 29~39bar, and the tightness test pressure is 19~25bar. Generally, a valve with a nominal pressure of 24.5 bar can meet the requirements.

　　2. The valves used in the ammonia system chiller are not allowed to have copper, galvanized, and tin-plated parts.

　　 3. The valve should have a reverse valve seat, and the packing can be replaced during operation when the valve is fully opened.

　　Ⅱ、Connector

Ammonia system chiller pipes are mainly welded, and those with a pipe wall thickness of less than 4mm use gas welding, and those with a wall thickness of more than 4mm use electric welding. Flanges can also be used where necessary, and single flanges should have concave and convex openings; all elbows should be simmered; The valve and pipe thread connection must not use white oil hemp wire, and should use pure pure glycerin and yellow powder blended packing; when the branch pipe is connected to the header box, the branch pipe should be connected with the header with an arc-shaped fork to avoid mismatching liquid Evenly.

In the Freon refrigeration system, its connection method is: steel pipe and steel pipe are welded, steel pipe and copper pipe are silver welded, copper pipe and copper pipe are silver welded, and the pipe wall should not be galvanized, and the flange should not be used with natural rubber , Mineral oil is not allowed, and its sealing material should be corrosion-resistant material, generally nitrile rubber.