Hilger hose fittings Germany Hilger model Hilger price

Hilger hose fittings are connection tools between pipes, serving as detachable connection points between components and pipes. Main pipe fittings come in a wide variety of types. Commonly used pipe fittings can generally be divided into hard pipe fittings and hose fittings. Hard pipe fittings include flared type, bite-type (ferrule type), and welded type. Hose fittings are mainly crimped rubber hose fittings. Bite-type pipe fittings consist of three parts: the fitting body, the ferrule, and the nut. When the ferrule and nut are placed on the steel pipe and inserted into the fitting body, tightening the nut causes the outer side of the front end of the ferrule to fit against the conical surface of the fitting body, and the inner edge bites evenly into the seamless steel pipe, forming an effective seal. These are sealed pipe fittings suitable for non-corrosive or corrosive media such as oil, water, and gas. The specification requirements for aluminum-plastic composite pipes are relatively flexible. After connection with the pipeline, they feature reliable connections and good sealing performance.

Hilger hose fitting classification

Welded pipe fittings utilize a adapter pipe welded to the tube. An O-shaped sealing ring provides face sealing between the fitting body and the adapter pipe. The structure is simple, easy to manufacture, offers good sealing, and does not require high dimensional precision for the tubes. High welding quality is required, and assembly/disassembly is inconvenient. Working pressure can reach 31.5MPa, working temperature -25 to 80°C, suitable for piping systems using oil as the medium. Bite-type (ferrule) pipe fittings use ferrule deformation to grip the tube and provide sealing. They feature advanced structure, good performance, light weight, small size, and ease of use, and are widely used in hydraulic systems. Working pressure can reach 31.5MPa. High tube dimensional precision is required, requiring cold-drawn steel tubes. Ferrule precision is also high. Suitable for piping systems with oil, gas, and general corrosive media. Flared pipe fittings use tube end flaring for sealing, requiring no other sealing elements. The structure is simple, suitable for thin-walled tube connections, and applicable to low-pressure piping systems with oil or gas as the medium. Insert-welded pipe fittings involve inserting the tube of required length into the pipe fitting until the tube end contacts the inner end of the fitting, then welding the tube and fitting into one unit. This eliminates the need for an adapter pipe but requires strict tube dimensions. Suitable for piping systems with oil or gas as the medium. Taper-seal welded pipe fittings have an adapter pipe with an external tapered surface plus an O-shaped sealing ring matching the internal tapered surface of the fitting body, tightened with threads. Working pressure can reach 16 to 31.5MPa, working temperature -25 to 80°C, suitable for piping systems with oil as the medium. Crimped rubber hose fittings are easy to install but add a tightening process. If the hose is damaged, the fitting outer sleeve cannot be reused. They form an assembly with wire-braided rubber hoses. They can be connected and used with welded pipe fittings sealed with O-shaped 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 rubber hose fittings do not require stripping the outer rubber layer of the hose during assembly. For hoses with slightly different outer diameters, compensation is provided by the pre-compression amount of the fitting outer sleeve on the hose. A hose pre-compression amount within the range of 31% to 50% ensures no leakage under working pressure, preventing hose pull-out and outer rubber layer rupture. They can be connected and used with welded pipe fittings, quick-change fittings, and bite-type (ferrule) pipe fittings. Suitable for piping systems with oil, water, or gas as the medium. Their working pressure and medium temperature are limited by the connected hose. Quick-change fittings (two-end closed type): After the tube is disconnected, it self-seals, preventing liquid loss from the pipeline, making them suitable for frequent disassembly occasions. The structure is relatively complex, resulting in higher local resistance loss. Suitable for piping systems with oil or gas as the medium, working pressure below 31.5MPa, medium temperature -20 to 80°C. Quick-change fittings (two-end open type): Suitable for piping systems with oil or gas as the medium. Their working pressure and medium temperature are limited by the connected hose.

Hilger hose fitting selection

How to select high-pressure pipe fittings: 1, Hose dimensions: The hose inner diameter must be appropriate. If the hose is fixed with clamps or passes through spacers such as steel plates, attention must also be paid to the hose outer diameter dimensions. 2, Working pressure: According to the safety factor for hydraulic hoses specified in relevant international standards, the recommended working pressure is typically one-quarter of the hose's minimum burst pressure value. 3, Impact pressure and fatigue life: Hose selection is determined based on the maximum pressure value of the hydraulic system design. Impact pressure does not seriously affect the fatigue life of the hose. For hydraulic systems with particularly frequent impact pressure, it is recommended to select hose products specially resistant to pulsating impact. 4, Temperature range: Users should use hoses within the temperature range permitted by the hose quality specifications. For continuous operation, regular cooling is recommended. 5, Chemical compatibility: If special hydraulic media are used, users must ensure that the hose assembly's inner and outer layers, fittings, and O-type sealing rings are compatible with the medium.

Hilger hose fitting precautions

Before installation, all steel pipes can be pickled according to the requirements of Chapter 9, especially steel pipes connected to bite-type (ferrule) pipe fittings, which should be pickled first, and then the ferrules should be pre-tightened on the pipe ends; (2) All pipe fittings should be cleaned with kerosene before installation. The o-type sealing rings inside should be temporarily removed and stored, to be installed only during formal installation; (3) During construction, keep the oil ports of equipment such as pumps and distributors, as well as the openings of pipe fittings and pipe ends, clean. Prevent foreign matter such as water and dust from entering; (4) Pipelines should be laid in a free state. Do not apply excessive radial force to forcibly fix and connect pipelines after welding; (5) Check the oil holes of bearing housings in advance to ensure internal oil passages are unobstructed and that the oil port threads match the fittings.

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