F37
The Parflange F37 system is a technology from the hydraulics division by Parker-Hannifin that enables a weld-free flange connection of hydraulic pipes.
Action
The connection is made application-related with the help of a flange or retaining ring technology.
Crimping technology
After an F37 flange has been pulled onto a seamless pipe, the pipe end to be connected is expanded using a special orbital flanging process, which compacts the surface of the pipe end by roller burnishing. The end of the pipe has a funnel-like shape with an angle of 37 °, which explains the origin of the name.
An insert made of steel or stainless steel, the geometry of which matches the funnel-shaped pipe end, is then inserted into the expanded pipe end. This insert has an O-ring on the funnel-shaped side to press itself tightly against the pipe wall. Furthermore, the insert is provided with a groove on the front side into which a profile sealing ring "F37 Seal" made of z. B. polyurethane is inserted. Alternatively, the insert can be designed with a flat face or a composite seal made of steel or stainless steel with an elastomer sealing lip made of NBR or FKM. There is a special form of insert for a pipe-to-pipe connection, which has funnel-shaped contours on both sides with an O-ring seal.
The flange is then positioned on the pipe end in order to mount it on a hydraulic component or another pipe, which is also provided with a flange and a corresponding insert.
Retaining ring technology
With the retaining ring technology, the tube end is provided with a radial groove to accommodate a stainless steel retaining ring. The retaining ring consists of two ring halves, which are located inside a spiral spring and is used to fix the flange. For assembly, the retaining ring flange is pulled over the seamless hydraulic pipe. The retaining ring is stretched over the pipe end and snaps into the groove created previously. A special inner contour of the retaining ring flange lies against the retaining ring.
The Parflange F37 retaining ring connection is sealed by a composite seal that is placed on the face of the pipe end or a pipe seal carrier. The pipe seal carrier has soft seals ("F37 Seal" or O-ring) on both sides and a centering aid on one side, which simplifies the assembly procedure.
functionality
Crimping technology
With the pipe end widened by flanging, the flange has a support surface and can therefore absorb forces, which leads to a more stable connection.
The insert initially has a sealing function. With its O-ring on the funnel-shaped pipe side, it seals the connection to the pipe itself. The connection point is sealed by the profile sealing ring "F37 Seal" on the face or a composite seal. If the connection point has a soft seal on the face, an insert with a correspondingly flat face is used. An insert with a funnel-shaped contour on both sides and an O-ring seal can be used to connect two pipe ends.
At the same time, the insert strengthens the connection. Due to the larger area at the connection point created by the insert, the pressure generated when screwing the flanges can expand to a larger contact surface and thus increase the strength of the connection point.
Retaining ring technology
The special inner contour of the retaining ring flange lies against the retaining ring mounted on the pipe end. When the system is tightened, a form-fitting connection is created, which is sealed on the front side by means of a composite seal or pipe seal carrier.
application
The Parflange F37 system is used to connect hydraulic pipes without the use of thermal welding .
Depending on the pipe and flange size, the system is approved for pressures of up to 420 bar . This system is mainly used in shipbuilding , offshore and in general in the heavy machinery industry. B. to use cranes and other lifting devices. This technology can also be used to connect pipes with an outer diameter of 16 to 273 mm (1/2 "to 10" flange sizes).
Approvals
The system is approved by leading certification bodies . Connections and hole patterns are according to ISO 6162-1 / SAE J 518 Code 61 (3000 PSI / 210 bar) or according to ISO 6162-2 / SAE J518 Code 62 (6000 PSI / 420 bar) and ISO 6164 (400 bar) standardized.
Further information
The main advantages over welding are savings in time and costs. For example, For example, in the case of a joint with F37, in contrast to welding, the costly examination using X-rays and cleaning using chemical antioxidants , which makes the technology overall more environmentally friendly and safer.
Compared to welding, stress corrosion cracking is not possible, so that a maximum service life of the pipeline can be achieved and maintenance costs are reduced.
See also
Web links
Animated representation of a Parflange F37 flared connection
Animated representation of a Parflange F37 retaining ring connection
swell
- Trade journal: Fluid Markt 2008 (2008 edition), Measurement Technology Equipment, Tube Fittings (Verlag Moderne Industrie)
- Trade journal: Fluid (10/2012 edition), Economical and high pressure resistant - flanges for compact, quickly installed hydraulic connections (Verlag Moderne Industrie)
- Trade journal: Fluid (Edition 05/2013), From construction to installation - hydraulic lines according to customer requirements (Verlag Moderne Industrie)
- Parflange F37 for Pipe and Pipe Connections, Catalog 4162-4 (03/2013), Parker Hannifin Corporation