German gewehr seals, gewehr models, gewehr prices

gewehr seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common shaft seal types include packing seals, mechanical seals, and power seals. The shaft seal for reciprocating pumps is typically a packing seal. Diaphragm reciprocating pumps can be used when transporting media where leakage is not permitted. The shaft seals for rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

gewehr seal types

1) Extruded seals: Extruded seals, particularly O rings, have been widely used in sealing applications. Other types such as X, T, D, square, and triangular shapes are suitable for various applications. Improvements focus on stabilizing sealing performance, enhancing pressure resistance, and reducing friction. They can also form combination seals with low-friction plastics like PTFE and nylon slide rings and support rings to improve pressure resistance and reduce friction. Some manufacturers' products are rated for speeds up to 7.5m/s and sealing pressures of 5.6MPa. 2) Reciprocating lip seals: Reciprocating lip seals, also known as lip gaskets or cups, are widely used for dynamic sealing in hydraulic system reciprocating cylinders. The pressure-bearing surface is lip-shaped, with a slight interference fit during installation to ensure full contact between the lip edge and the sealing surface. During cylinder operation, as pressure increases, the contact force and area increase, improving sealing. During the return stroke, pressure decreases, and both contact area and friction are lower than during the working stroke, creating a breathing effect that lubricates the lip. There are many types of reciprocating dynamic seals, commonly including J, L, U, V, and Y types. Various combination and composite seals are also available, such as bellows, bud, and multi-lip seals. Under high pressure, extrusion must be prevented by selecting materials with sufficient tear strength, hardness, and modulus, or by using support rings or reinforced elastomers. Seals used in high-pressure, high-speed, or high-temperature conditions often use composite combination seals. Their common feature is two lips contacting the cylinder wall. A groove in the middle of the sealing area stores medium, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals for pneumatic systems require operation without oil lubrication; some integrate dust wipers with the seal structure. 3) Rotary shaft lip seals: There are no fewer than 200 varieties of similar structures, such as hydrodynamic, inner-cage, assembled, outer-cage, bonded PTFE AF type, and dual-modulus return-flow types. The advantage of outer-cage assembled types is accurate positioning, high concentricity, and good heat dissipation. They remain stable under pressure and vibration, resulting in longer service life and saving rubber material. Dual-modulus return-flow types apply wave seal theory by adding a low-modulus, easily deformable material at the sealing contact point to achieve a return-flow effect, while reducing product design and mold processing costs. Flexible sealing treatment should be applied at joints between rigid waterproof layers and gable walls, parapet walls, and protruding roof structures.

gewehr seal influencing factors

Hydraulic seals play a crucial role in the integrity of hydraulic and pneumatic systems. If the seal of a hydraulic or pneumatic component is inadequate, the component itself is not considered a good product. Many factors affect seals. First, pressure is a significant factor affecting seal quality; the magnitude of pressure and the duration of pressure cycles greatly impact 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, clearance between piston and cylinder barrel, and clearance between piston and cylinder head. Another factor is temperature and friction. It is difficult to define the maximum and minimum operating temperatures for a seal material because this is the result of a combination of factors. Operating temperatures for pistons and piston rods differ, requiring distinct selections. Additionally, seal surface roughness, surface characteristics, pressure, medium, temperature, seal material, seal type, and motion speed all influence seal performance. Finally, surface treatment is critical; experience shows that the surface characteristics of cylinder pistons and piston rods significantly affect seal life. Surface characteristics are often defined by the RA value, which is the arithmetic mean of the absolute deviations of the surface profile from the centerline. However, these values do not fully represent the impact of surface conditions on seals, as different surface shape features can cause varying degrees of seal wear even at the same roughness level.

gewehr seal specifications and applications

1) Standard single-lip: Generally used for sealing mineral oil, water, and other media in high/low-speed rotating shafts and reciprocating motions. Standard oil seals are used in environments with little dust and impurities, resistant to media pressure<0.05MPa conditions, maximum linear speed 15m/s, reciprocating speed<0.1m/s. 2) Standard double-lip: In addition to the usage characteristics of the above-mentioned S type oil seals, they also provide dust protection. Standard oil seals with a dust lip can prevent dust ingress and resist media pressure<0.05MPa conditions, linear speed ≤ 15m/s. 3) Springless type: Springless single-lip inner-cage rubber oil seal. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) Outer-cage single-lip: Single-lip outer-cage rubber oil seal with spring, featuring a thin waist, good followability, and good rigidity. Standard oil seals are used in environments with little dust and impurities, resistant to media pressure<0.05MPa conditions. Rotating shaft linear speed ≤ 15m/s. 5) Outer-cage double-lip: Double-lip outer-cage rubber oil seal with auxiliary lip, featuring a thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress and resist media pressure<0.05MPa conditions. Rotational speed ≤ 15m/s. 6) Assembled single-lip: Outer-cage oil seal formed by assembling inner and outer cages with rolled edges, offering high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load conditions under high temperature and high speed, media pressure ≤ 0.05MPa, maximum linear speed ≤ 15m/s. 7) Unidirectional return-flow type (right-hand/left-hand): Angled ribs are manufactured on the air side of the lip, utilizing fluid dynamics principles to create a unidirectional pumping action with a return-flow effect. Related to the shaft's rotation direction, the radial force is smaller than that of standard oil seals due to the return-flow effect, reducing wear and heat generation, and extending service life. Suitable for media pressure<0.05MPa conditions, rotational speed ≤ 20m/s. 8) Pressure-resistant type: Short lip and short, thick waist provide pressure resistance, working pressure ≤ 3MPa. Suitable for conditions with media pressure ≤ 3MPa, applicable as shaft end oil seals for high-pressure pumps. Generally, PV value ≤ 8. Rotating shaft linear speed ≤ 15m/s.

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