Dopag hose fittings Germany Dopag model Dopag price

Dopag hose fittings are a type of high-quality flexible piping in modern industrial pipeline systems. They mainly consist of bellows, braided mesh, and fittings. The inner tube is a thin-walled stainless steel bellows with a spiral or annular shape. The outer braided mesh of the bellows is woven from stainless steel wire or steel strip according to specific parameters. The fittings or flanges at both ends of the hose are matched to the fittings or flanges of the customer's piping. The bellows of the hose are formed by high-precision plastic working of extremely thin-walled seamless or longitudinally welded stainless steel pipes. Due to the elastic characteristics of the bellows profile, the hose possesses good flexibility and fatigue resistance, allowing it to easily absorb cyclic loads from various motion deformations, especially providing the ability to compensate for large displacements in pipeline systems. Media visualization (media visible), process automation.

Dopag hose fitting features

Threaded fittings refer to pipe connectors with threads and are one of the most common pipe fittings in industry and daily life. Threaded fittings make pipe connections simpler and disassembly/replacement easier, significantly saving on pipe connection costs. Threaded fittings generally include threaded elbows, threaded tees, threaded unions, threaded caps, threaded couplings, threaded reducers, threaded plugs, male threaded adapters, bushings, etc. Industrial threaded fittings are generally made of metal, with high pressure resistance; materials include carbon steel, stainless steel, alloy steel, brass, etc. Materials for threaded fittings used in daily life generally include PC, PVC, PE, PPR, etc.

Dopag hose fitting applications

Pipe fittings are connection tools between pipes and are detachable connection points between components and pipes. They play an indispensable and important role among pipe fittings and are one of the two main components of hydraulic piping. Pipe fittings are used for straight connections in instruments, etc., with connection forms including socket weld or threaded connections. They are mainly used for small-diameter low-pressure pipelines, for parts requiring frequent assembly and disassembly, or as final adjustments for pipelines using threaded fittings. The structural form should preferably adopt a metal-to-metal contact seal structure. Gasket seal structures are typically used in general pipelines transporting water, oil, air, etc., and are manufactured from malleable cast iron. In addition, usage requirements and price are also factors considered during selection. Pipe fittings come in many types; commonly used pipe fittings can generally be divided into hard pipe fittings and hose fittings. If classified by the connection method between the fitting and the pipe, hard pipe fittings include flare-type, compression-type, and welded types, while hose fittings are mainly crimped rubber hose fittings. The connection methods between pipes and fittings in hydraulic systems also differ; the pipe insertion end uses connecting threads. Tapered threads rely on their conical body tightening and use substances such as PTFE for sealing operations, mainly applied in medium and low-pressure hydraulic systems. Fine-pitch threads provide excellent sealing effects and are frequently used in high-pressure systems, but they require combination washers or O rings for end-face sealing. Copper washers are sometimes used, which are more suitable for pipes with thicker walls. Its main components include the fitting body, sleeve, and nut. During use, embed the fitting body into the target, use the aforementioned washers to seal the end face, and seal between the fitting body and the sleeve with rubber; spherical sealing is sometimes also used. Since pipe fittings are detachable connection elements, in addition to meeting requirements for normal connection stability, strong sealing, reasonable dimensions, low pressure loss, and good manufacturability, they must also meet the requirement for convenient assembly and disassembly. Therefore, do not underestimate these small pipe fittings, as only their existence supports the entire hydraulic system.

Dopag hose fitting installation

1. Cut the seamless steel pipe to the appropriate length and remove burrs from the pipe end. The pipe end face must be perpendicular to the axis, with an angular tolerance not greater than 0.5°. If the pipe needs to be bent, the straight length from the pipe end to the bend must be no less than three times the nut length. 2. Slide the nut and ferrule onto the seamless steel pipe. Pay attention to the direction of the nut and ferrule; do not install them backwards. 3. Apply lubricating oil to the threads of the pre-assembled fitting body and the ferrule, insert the pipe into the fitting body (the pipe must be fully inserted), and hand-tighten the nut. 4. Tighten the nut until the ferrule grips the pipe; this turning point can be felt by an increase in tightening torque (pressure point). 5. After reaching the pressure point, tighten the compression nut further by 1/2 turn. 6. Remove the pre-assembled fitting body and check the embedding of the ferrule cutting edge; the visible raised band must fill the space at the ferrule end face. The ferrule may rotate slightly but must not move axially. 7. Final installation: apply lubricating oil to the threads of the fitting body in the actual installation, screw on the compression nut until an increase in tightening torque is felt, then tighten further by 1/2 turn to complete the installation.

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