BOLLFILTER hose fittings Germany BOLLFILTER model BOLLFILTER price

BOLLFILTER hose fittings connect different hydraulic components to form a closed-loop hydraulic system, serving as a connecting accessory. They 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, acting as a connecting accessory.

BOLLFILTER hose fitting classification

Welded pipe fittings, using an adapter welded to the pipe. An O-ring seal provides face sealing between the fitting body and the adapter. Simple structure, easy to manufacture, good sealing performance, low requirements for pipe dimensional accuracy. Requires high welding quality, inconvenient assembly and disassembly. Operating pressure up to 31.5MPa, operating temperature -25 to 80°C, suitable for piping systems with oil as the medium. Bite-type pipe fittings, using the deformation of the bite ring to grip the pipe and provide sealing. Advanced structure, good performance, light weight, compact size, easy to use, widely used in hydraulic systems. Operating pressure up to 31.5MPa, requires high pipe dimensional accuracy, requiring cold-drawn steel pipes. High bite ring precision. Suitable for piping systems with oil, gas, and general corrosive media. Flared pipe fittings, using flaring at the pipe end for sealing, no other sealing elements required. Simple structure, suitable for thin-walled pipe connections, suitable for low-pressure piping systems with oil or gas as the medium. Insert-welded pipe fittings, insert the pipe of required length into the fitting until the pipe end contacts the inner end of the fitting, weld the pipe and fitting into one unit, eliminating the need for an adapter, but requiring strict pipe dimensions. Suitable for piping systems with oil or gas as the medium. Taper-seal welded pipe fittings, one end of the adapter has an external taper surface with an O-ring seal matching the internal taper surface of the fitting body, tightened with threads. Operating pressure up to 16 to 31.5MPa, operating temperature -25 to 80°C, suitable for piping systems with oil as the medium. Crimped hose fittings, easy to install, but adds a crimping process. After hose damage, the fitting outer sleeve cannot be reused; assembled with wire-braided hoses to form a complete assembly. Can be connected with welded pipe fittings sealed with O-rings. Suitable for piping systems with oil, water, or gas as the medium. Medium temperature: Oil: -30 to 80°C; Air: -30 to 50°C; Water: below 80°C. Three-piece hose fittings, no need to strip the outer rubber layer of the hose during assembly. For hoses with slightly different outer diameters, compensation is achieved by the pre-compression of the hose by the fitting outer sleeve. The hose pre-compression within the range of 31% to 50% ensures no leakage under operating pressure, no hose pull-out, and no cracking of the outer rubber layer. Can be connected with welded pipe fittings, quick-disconnect couplings, and bite-type pipe fittings. Suitable for piping systems with oil, water, or gas as the medium; operating pressure and medium temperature are limited by the connected hose. Quick-disconnect couplings (two-way shut-off), self-sealing after pipe disconnection, preventing fluid loss in the pipeline, thus suitable for frequent disassembly applications. Complex structure, higher local resistance loss. Suitable for piping systems with oil or gas as the medium, operating pressure below 31.5MPa, medium temperature -20 to 80°C. Quick-disconnect couplings (two-way open), suitable for piping systems with oil or gas as the medium; operating pressure and medium temperature are limited by the connected hose.

BOLLFILTER hose fitting differences

The difference between internal thread and external thread is: internal thread is female thread, with threads inside the hole; external thread is male thread, with threads on the outer surface of the cylinder. Internal thread and external thread are industry terms, referring to the thread mating process used in screw and nut connections. Screw and nut mating allows for easy disassembly and convenient installation, and is one of the commonly used connection and fixation processes in mechanical equipment, piping, and metal structure engineering installation. Different names for the same type of pipe fitting are simple to remember: internal connector has external threads; external connector has internal threads. Threaded connectors are generally used for piping, serving a connecting function. External thread: refers to threads on the outside of pipes, etc., generally directly touchable; internal thread: refers to threads inside pipes, etc., generally requiring reaching inside to touch. In industry, you may also encounter right-hand threads and left-hand threads. Right-hand thread: threads that tighten by turning clockwise (righty-tighty), common in daily life, with screws being the most common example. Left-hand thread: threads that must be turned in the reverse direction to tighten, less common in daily life, but more common in specialized fields such as ventilation.

BOLLFILTER hose fitting structure

Includes a female coupling body with a through-hole containing a steel ball; a male coupling pin with a groove on its surface; a collet; the female coupling body and male coupling pin are sealed together, with the steel ball in the body engaging the groove on the pin surface; the collet is fitted over the outer surface of the female coupling body. Characterized by: additionally including a pull sleeve, which is fitted over the surface of the male coupling pin and connects to the collet on the female coupling via its internal thread.

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