schellhorn fasteners Germany schellhorn model schellhorn price

schellhorn fastener gaskets are mechanical seals between two objects, typically used as spacers to prevent pressure and corrosion between the two objects. They are also used to distribute the load of threaded fasteners and prevent leakage in pipelines due to natural thermal expansion and contraction. Belleville washers, wave washers, wear-resistant pads, preload indicators, locking devices. Since machined surfaces cannot be perfect, gaskets are used to fill irregularities. Materials include stainless steel and carbon steel (carbon steel is essentially iron). Gaskets are formed by winding metal strips (usually v shaped metal strips) and non-metallic strips into a ring. The metal and non-metallic strips are wound alternately. Due to their good elasticity, they are widely used in flange sealing structures in industries such as petrochemical, chemical, and power. Depending on the specific location, steel rings can be added to the inner or outer layer of the gasket for positioning or reinforcement.

schellhorn fastener material

Gaskets are components located between connectors and nuts, generally flat metal rings. Metallic gaskets, and non-metallic gaskets made of rubber, synthetic resin, PTFE, etc. Non-metallic covered gaskets: gaskets covered with a layer of synthetic resin, etc. Semi-metallic gaskets: gaskets made of metallic and non-metallic materials, such as spiral wound gaskets and metal-clad gaskets. Spiral wound gaskets consist of metal strips with V-shaped or W-shaped cross-sections sandwiching non-metallic strips, wound spirally. An inner ring is a metal ring set in the inner circle of the spiral wound gasket; an outer ring is a metal ring set in the outer circle of the spiral wound gasket. Metal-clad gaskets are gaskets made of metals such as steel, aluminum, copper, nickel, or Monel alloy. Metal and non-metallic strips are wound alternately. Due to their good elasticity, they are used in flange sealing structures in various industries. Depending on the specific location, steel rings can be added to the inner or outer layer of the gasket for positioning or reinforcement.

schellhorn fastener applicable environment

Carbon steel: Recommended maximum operating temperature not exceeding 538℃, especially when the medium is oxidizing. High-quality thin carbon steel plates are also unsuitable for equipment manufacturing involving inorganic acids, neutral or acidic salt solutions. If carbon steel is subjected to stress, the failure rate of equipment under hot water conditions is very high. Carbon steel gaskets are typically used for high-concentration acids and many alkaline solutions. Brinell hardness approximately 120. Adding about 2% molybdenum to 304 stainless steel improves its strength and corrosion resistance at elevated temperatures. It exhibits higher creep resistance than other common stainless steels at elevated temperatures. Recommended maximum operating temperature not exceeding 760℃. Brinell hardness approximately 160. Aluminum (content not less than 99%). Aluminum has excellent corrosion resistance and machinability, suitable for manufacturing double-jacketed gaskets. Brinell hardness approximately 35. Recommended maximum continuous operating temperature not exceeding 436℃.

schellhorn fastener installation requirements

The gasket and flange sealing surface must be cleaned thoroughly, with no scratches, spots, or other defects that could affect sealing performance. The outer diameter of the gasket should be slightly smaller than the outer diameter of the flange sealing surface, and the inner diameter of the gasket should be slightly larger than the inner diameter of the pipe. The difference between the two inner diameters is generally taken as 2 times the thickness of the sealing gasket to ensure that the inner edge of the gasket does not extend into the vessel or pipe after tightening, thereby avoiding obstruction of fluid flow. The gasket preload should not exceed the design specification to prevent excessive compression and loss of resilience. When installing the gasket, tighten the nuts sequentially. Do not reach the design value in a single pass. Generally, cycle at least 2 to 13 times to ensure uniform stress distribution on the gasket. When replacing gaskets in pressure vessels and pipelines containing flammable or explosive media, use safety tools to avoid sparks caused by tool contact with the flange or bolts, which could lead to fire or explosion accidents.

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