German C.F.R seals C.F.R models C.F.R prices

C.F.R seals are a typical representative of oil seals; the term "oil seal" generally refers to skeleton oil seals. The function of an oil seal is generally to isolate components requiring lubrication within transmission parts from the external environment, preventing lubricating oil leakage. The skeleton acts like reinforcing steel in concrete components, providing reinforcement and enabling the oil seal to maintain its shape and tension. Based on structural form, they can be divided into single-lip skeleton oil seals and double-lip skeleton oil seals. The secondary lip of a double-lip skeleton oil seal serves a dust-proof function, preventing external dust, impurities, etc., from entering the machine interior. Based on skeleton type, they can be divided into inner-covered skeleton oil seals, exposed skeleton oil seals, and assembled oil seals. Based on operating conditions, they can be divided into rotating skeleton oil seals and reciprocating skeleton oil seals. Used in locations such as gasoline engine crankshafts, diesel engine crankshafts, gearboxes, differentials, shock absorbers, engines, axles, etc.

C.F.R seal types

1) Compression seals: Compression seals, especially O rings, have always been widely used in sealing applications. Other forms such as X type, T type, D type, square, triangular, etc., are suitable for application in different occasions. The direction of improvement is to make their sealing performance stable and reliable, increase their pressure resistance, and reduce friction. They can also form combined seals with low-friction plastics such as PTFE and nylon sliding rings and support rings. This increases pressure resistance and reduces friction. Some manufacturers' products are permitted to reach speeds of 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip gaskets or cup seals, are quite widely used for dynamic sealing in reciprocating hydraulic cylinders. The pressure-bearing surface of this seal is lip-shaped; during installation, there is a minimal interference fit, allowing the lip edge to fully contact the sealing surface to create a sealing effect. When the cylinder operates, as pressure rises, the contact force and contact area increase, thereby improving sealing. During the cylinder return stroke, pressure drops, and both contact area and friction are lower than during the working stroke, thus creating a breathing effect that lubricates the lip. There are many types of reciprocating dynamic seals; common ones include J type, L type, U type, V type, and Y type. There are also various combination and composite seals, such as bellows-type, bud-type, and multi-lip seals. Extrusion must be prevented under high pressure by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings for protection, or by employing reinforced elastomers. Seals used under high pressure, high speed, or high temperature often use composite combination seals. Their common characteristic is having two lips in contact with the cylinder wall. A groove is provided in the middle of the sealing area to store media, improving lubricity, resulting in less lip wear and reliable sealing. Lip seals used in pneumatic systems are required to operate in an unlubricated state; regarding contact pressure, some designs integrate the dust wiper and the seal into a single structure. 3) Rotating shaft lip seals: There are no fewer than 200 varieties of similar structures. Examples include hydrodynamic type, inner-covered skeleton, assembled type, exposed skeleton, PTFE-bonded AF type, dual-modulus return-flow type, etc. The advantage of the exposed skeleton assembled type is accurate positioning, high concentricity, and good heat conduction and dissipation conditions. It remains stable under pressure and vibration, resulting in a longer service life while saving rubber material. The dual-modulus return-flow type applies wave seal theory; by adding a low-modulus, easily deformable material at the sealing contact area, a return-flow effect is achieved, simultaneously reducing product design and mold processing costs. Joints between rigid waterproof layers and gable walls, parapet walls, and structures protruding from the roof should all be properly treated with flexible sealing.

C.F.R seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems; if the seals of a hydraulic or pneumatic component are not up to standard, then that component is not a good product. Many factors influence seals. First, pressure is an important factor affecting seal quality; the magnitude of pressure and the duration of pressure cycle changes have a significant impact on seal damage (such as extrusion). The higher the pressure, the greater the influence of other factors on seal performance, such as temperature, speed, seal material, the gap between the piston and cylinder barrel, and the gap between the piston and cylinder head. Another factor is temperature and friction. It is difficult to describe the maximum and minimum operating temperatures for a specific seal material because this is the result of the combined influence of a series of factors. Operating temperatures for pistons and piston rods differ, so they must be selected accordingly. Another factor is the surface roughness of the seal product; surface characteristics, pressure, medium, temperature, seal material, seal type, and motion speed are all factors affecting seals. The last factor is surface treatment. Experience shows that the surface characteristics of cylinder pistons and piston rods have a very significant impact on seal life. Surface characteristics are commonly defined by the RA value, where RA is the arithmetic mean of the absolute values of surface profile deviations from the centerline. However, these figures do not completely represent the influence of surface conditions on seals, because even under the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

C.F.R seal installation precautions

1) During installation, great care must be taken to avoid installation deviations. Tightening of the gland should be performed after coupling alignment. Bolts should be tightened evenly to prevent skewing of the gland face. Check each point with a feeler gauge; the error must not exceed 0.05 mm. Check the mating clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve; it must be uniform around the circumference. Check each point with a feeler gauge; the permissible error must not exceed 0.01 mm. 2) Spring compression must be carried out according to regulations; excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve a sealing effect. 3) After installing the moving ring, it should automatically spring back when pressed against the spring. 4) Installation position requirements: To ensure stable operation, long life, and low leakage performance of the mechanical seal, it is very important to install it correctly on the machine. When installing the mechanical seal onto the machine, carefully compare it with the general assembly drawing before installation to confirm that all parts are ready. At this time, pay attention to any abnormalities such as scratches or defects on the sealing faces of the friction pair and sealing rings. Also check for scratches on the surfaces of the shaft or shaft sleeve contacting the packing and sealing rings (O rings), flanges, and other components. If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts to the site than needed. Thus, if there are leftover parts after installation, it indicates a missed installation step; if parts are insufficient, it means parts were assembled in unnecessary places, which serves as a self-check during installation.

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