bossard fasteners Germany bossard models bossard prices

bossard fastener gaskets are mechanical seals between two objects, typically used as spacers to prevent pressure and corrosion between the two objects. Other uses include distributing load for threaded fasteners and preventing leaks 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 (generally 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 the petrochemical, chemical, and power industries. Depending on the specific location, steel rings can be added to the inner or outer layer of the gasket for positioning or reinforcement.

bossard fastener materials

A gasket is a component placed between a connector and a nut, typically a flat metal ring. Gaskets include metallic gaskets and non-metallic gaskets made of rubber, synthetic resin, polytetrafluoroethylene (PTFE), etc. Non-metallic covered gaskets are gaskets with an outer layer of synthetic resin, etc. Semi-metallic gaskets are gaskets made of metallic and non-metallic materials, such as spiral wound gaskets and metal-clad gaskets. A spiral wound gasket is formed by spirally winding a metal strip with a shaped cross-section around a non-metallic strip. An inner ring is a metal ring installed on the inner circumference of the spiral wound gasket; an outer ring is a metal ring installed on the outer circumference of the spiral wound gasket. Metal-clad gaskets are gaskets made of metals such as steel, aluminum, copper, nickel, or Monel alloy. The metal strip and non-metallic strip are alternately wound. Due to their good elasticity, they are used in flange sealing structures in industries such as oil and gas. Depending on the specific location, steel rings can be added to the inner or outer layer of the gasket for positioning or reinforcement.

bossard fasteners applicable environments

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 manufacturing equipment for 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 about 2% molybdenum to 304 stainless steel increases 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 428℃.

bossard 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 gasket's outer diameter should be slightly smaller than the flange sealing surface's outer diameter, and the gasket's inner diameter should be slightly larger than the pipe's inner diameter. 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. Gasket preload should not exceed design specifications to prevent excessive compression and loss of resilience. When installing gaskets, tighten the nuts sequentially. Do not reach the design value in a single pass. Generally, cycle at least 2 to 5 times to ensure uniform stress distribution on the gasket. For pressure vessels and pipelines containing flammable or explosive media, use safety tools when replacing gaskets to avoid sparks caused by tool contact with flanges or bolts, which could lead to fire or explosion.

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