seher fasteners Germany seher model seher price

seher 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 load on threaded fasteners and prevent leakage in pipelines due to natural thermal expansion and contraction. Belleville washers, wave washers, wear 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 ring-shaped components formed by winding metal strips (typically v shaped metal strips) and non-metallic strips. 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.

seher fastener material

Gaskets are components located between connectors and nuts, generally flat metal rings. Includes metal gaskets and non-metallic gaskets made of rubber, synthetic resin, PTFE, etc. Non-metallic covered gaskets: gaskets with an outer layer of synthetic resin, etc. Semi-metallic gaskets: gaskets made of metal and non-metallic materials, such as spiral wound gaskets and metal jacketed gaskets. Spiral wound gaskets consist of metal strips with V or W shaped cross-sections sandwiching non-metallic strips, wound spirally. Inner ring: a metal ring set on the inner circle of the spiral wound gasket. Outer ring: a metal ring set on the outer circle of the spiral wound gasket. Metal jacketed gaskets: 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.

seher 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 handling inorganic acids, neutral or acidic salt solutions. If carbon steel is subjected to stress, the accident rate for 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 approximately 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 434℃.

seher fastener installation requirements

The gasket and flange sealing surface must be cleaned thoroughly; there must be no defects such as scratches or spots that could affect the 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 after tightening, the inner edge of the gasket does not extend into the vessel or pipe, 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 11 times to ensure uniform stress distribution on the gasket. When replacing gaskets on 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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