Gasket knowledge of pneumatic actuators

It consists of metal and nonmetal material layer winding alternately together. Winding metal belt is usually V and filler material between winding belt. With soft metal winding gasket with winding piece of flat gasket elasticity, and increases the strength in order to prevent the possible gasket leakage in high temperature and high pressure condition. Winding gasket strength with the chosen material. Strength by the number of the winding sheet: wrapped piece, the more the number of gasket can withstand the greater pressure. When winding gasket is compressed, if narrowed but not usual gasket surface effectively, the gasket will be crushed. When the compression for the metal back deformation, winding gasket can never be used again. As a general rule, winding gasket should never be used for soft seat or soft sealing parts; Here the closure of the institutions, such as the cock or plate, its corresponding is a non-metallic surface. Compression force of winding gasket is required after a soft seat ( Seal) Liner, the liner is gasket easier to compress. So, soft liner may be winding gasket all be compressed before being squeezed out. Unfortunately, this result is usually damaged bushing or valve leakage. In the past, the filling material was used in the high temperature winding gasket asbestos board. However, due to the material's controversial health and legal issues, many valve manufacturers, especially in North America businessman, said don't use it as a standard option. In these places, the newer ( And safer) Filler material has been developed and used, such as ceramic fiber board. In this period of gaskets, gasket has been known as the term is called insomnia ( 二自由度陀螺仪) , it can instead of at the most high temperature condition point of asbestos. Its high temperature sealing performance and contain the intertwining of graphite gaskets are similar in performance. Aside security and legal disputes, asbestos gasket is often the user to specify, especially in power generation industry. As mentioned in the comments of the asbestos gasket is mainly used in high temperature condition. It is typically used in stainless steel, carbon steel and chrome molybdenum steel valves. Out the asbestos, the commonly used filler material including ptfe, graphite, mica or ceramic plate. According to the process fluid and metal winding and the interactions of filling materials, winding pads can also be customized. Besides described earlier, winding can be made by the following materials: 304, 316, 347 or 321 stainless steel, monel, nickel, titanium, alloy 20, for nickel, carbon steel, alloy B, hardy hardy alloy C - 276, phosphor bronze, copper, gold or platinum.