Cartridges & Mechanical Seals

RELATED PRODUCTS 167 Packing Packing is used to seal rotating, alternating or helical movements. Its operating or sealing principle is achieved through the interference ob- tained by external tightening. Our packing is supplied in rolls of different lengths. The weight of these rolls depends on the cross-section, length and material. This catalogue contains a selection of the main materials we supply, depending on the working conditions and application points. • Mounting: When using packing in applications in which its use is necessary, it must be cut by hand and the ring must be shaped. A cutting template can be used or the packing can be wound around the shaft and the rings cut. The 45° bevel cut is the most appropriate. The rings must be inserted into the gasket one by one, with the cuts made at right angles to each other, tightened by the gasketed flange by hand. It is left to operate with constant leaks for 10 minutes and then tightened to reduce the leaks to an acceptable level (10 to 20 drops per minute). Leakage in the form of dripping is essential and ensures that the rings will not overheat. The correct tightening for pump packings is 0.5 – 1.5 N/ cm2. For valves, the minimum tightening required is 5 N/cm 2 . • Selection: To determine the correct braided packing type, the following must be known: fluid (liquid or gas), pH, temperature, pressure, type of movement, speed, shaft Ø and housing. It is important to consider all these details when selecting the most sui- table packing type. Pressurised fluid Mounting Operations A Operations B Operations C Operations D • Packing types: - PTFE packing - Graphite packing - Fibreglass packing - Packing with aramid fibres • Surface finishes, housings: To ensure the correct functioning of the packing it must be used in housings with certain finishes, otherwise it will rapidly deteriorate. Centrifugal pump shafts Rt = 1 à 2,5 microns Spindles Sleeves Gaskets Rt = 16 microns Ø ext.) The shaft hardness should be at least 50 Rockwell C.