Boll & Kirch hose fittings German Boll & Kirch models Boll & Kirch prices

Boll & Kirch hose fittings connect different hydraulic components (pumps, delivery lines, directional valves, shut-off valves, hydraulic motors, hydraulic cylinders, and some auxiliary components, such as level gauges, thermometers, pressure gauges, etc.) to form a closed-loop hydraulic system; hydraulic pipe fittings are the connecting accessories in this system. Hydraulic pipe fittings are detachable connectors between oil pipes and oil pipes, or between oil pipes and hydraulic components. They should meet requirements such as easy assembly and disassembly, reliable connection, reliable sealing, small external dimensions, high oil flow capacity, low pressure loss, and good machining processability. Hydraulic pipe fittings are widely used in various aspects of our lives. They are mainly used in hydraulic piping systems in industries such as energy, petrochemical, electric power, shipbuilding, automotive, rail transit, mining, metallurgy, steel plants, offshore engineering, and construction machinery. Construction machinery is where hydraulic pipe fittings are most extensively used.

Boll & Kirch hose fitting installation precautions

Pipe threads must meet requirements. Threading should be completed in two passes, using coolant during machining. Machine threads to the standard specified dimensions. Clean chips remaining on the threads or pipe ends, apply rust inhibitor to the thread surface for corrosion protection and sealing. The engagement length of the threaded connection should be tightened with appropriate torque using a pipe wrench on the pipe fitting's threaded joint. After connecting the pipe and fittings, apply rust-proof sealant or zinc-rich paint to exposed threads, all clamp marks, and surface damage. Do not install backwards when thread heights differ. Locking methods must be truly reliable. For bolt structures subjected to bending moments, minimize thread loading to avoid bending stress on the bolt. Threaded holes should not pass through two welded parts. For deep threaded holes, design corresponding bosses on the part. The heads of fastening bolts for high-speed rotating bodies should not protrude.

Boll & Kirch hose fitting specifications and applications

Fitting specifications are classified by interface type, mainly two kinds: one-half and three-quarters, i.e., 4-part pipe and 6-part pipe. They are suitable for faucet fittings or water pipe connectors, so the scope of application is relatively wide. Including spray guns, as long as the correct specification is selected, quick connection is possible. Whether connecting valves, water valves, or spray gun fittings, as long as they match, hearing a click indicates proper installation; then gently tighten the nut. A water pipe connector is a component that connects water pipes. Classified by usage method, there are three types: self-locking, ferrule-type, and external thread. Materials also vary, such as galvanized or chrome-plated, basically made from plated alloy materials, some with a matte finish. Its specifications are more varied than quick-connect fittings, such as one-quarter, three-quarters, three-eighths, one-half, etc., meaning it accommodates slightly more water pipe sizes. Select quick-connect fittings with similar specifications to the water pipe. If it is a 4-part pipe, the corresponding quick-connect fitting must also be 4-part specification, reaching 20 millimeters. First install it on both ends of the connecting water pipe, then gently hold and rotate by hand to tighten the nut. When a clicking sound is heard, it indicates full engagement. After tightening, it provides a sealing effect. Finally, turn on the faucet to check for leaks at the interface. If none, the installation is correct.

Boll & Kirch hose fitting working principle

1, the basic structure of this fitting is relatively simple, consisting of only three basic parts: the fitting body, ferrule, and nut. The main part is the ferrule, which is a metal ring with a cutting edge at the front. International standard GB3764-83 recommends uniform I type shape for the cutting edge. 2, the ferrule, which plays the main sealing role, moves axially along the inner tapered hole of the fitting body under the axial force of the tightening nut R. Simultaneously, the cutting edge end undergoes radial contraction under the radial reaction force R', eliminating the gap between the ferrule and the tube, causing the cutting edge to contact the tube surface. At this point, the tube no longer rotates. Continue rotating the nut to make the ferrule cutting edge firmly bite into the tube to ensure sealing. Another sealing stage is where the 13° chamfer at the ferrule cutting edge endpoint intersects with the outer circle (ridge) and tightly contacts the annular conical surface of the fitting body to form a sealing band; this is the main sealing area of the ferrule-type seal. The 86° conical surface at the ferrule tail undergoes radial contraction under the force of F, tightly gripping the connected tube, while the middle part bulges slightly. Thus, the ferrule has axial elastic deformation, which benefits ferrule sealing and prevents loosening of the tightening nut.

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