German Hawo seals Hawo model Hawo price

Hawo 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, and are also sealing devices installed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is usually a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

Hawo seal types

1) Squeeze-type seals: Squeeze-type seals, especially O rings, have been widely used in seals. Other types such as X, T, D, square, and triangular shapes are suitable for different applications. The direction of improvement is to make their sealing performance stable and reliable, increase their pressure resistance, and reduce friction. They can also form combination seals with low-friction plastics such as PTFE and nylon slide rings and support rings to increase 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 very small interference fit during installation, allowing the lip edge to fully contact the sealing surface to create a seal. When the cylinder operates, as pressure increases, the contact force and area increase, thereby improving sealing. During the cylinder return stroke, pressure decreases, and the contact area and friction are lower than during the working stroke, creating a breathing action that lubricates the lip. There are many types of reciprocating dynamic seals, commonly including J, L, U, V, and Y types. There are also various combination and composite seals, such as umbrella-shaped, bud-shaped, 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 using reinforced elastomers. Seals used in high-pressure, high-speed, or high-temperature conditions often use composite combination seals. Their common feature is having two lips in contact with the cylinder wall. A groove in the middle of the sealing area can store medium, improving lubrication, reducing lip wear, and ensuring reliable sealing. Lip seals used in pneumatic systems are required to operate without oil lubrication, with specific contact pressure; 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 type, inner skeleton enclosed, assembled type, outer skeleton exposed, bonded PTFE AF type, dual-modulus return flow type, etc. The advantage of the outer skeleton assembled type is accurate positioning, high concentricity, and good heat dissipation conditions. It is 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 point, a return flow effect is achieved, simultaneously reducing product design and mold processing costs. Rigid waterproof layers at joints with gable walls, parapet walls, and protruding roof structures should be properly treated (with flexible sealing).

Hawo 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 influence seals. First, pressure is a significant factor affecting seal quality; the level of pressure and the duration of pressure cycle changes greatly impact seal damage (such as extrusion). The higher the pressure, the greater the impact 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 describe 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, 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 all influence seals. Finally, surface treatment. Experience shows that the surface characteristics of cylinder pistons and piston rods have a significant impact on seal life. Surface characteristics are commonly defined by the surface roughness value RA, where RA is the arithmetic mean of the absolute values of the surface profile deviations from the centerline. However, these values do not fully represent the impact of surface conditions on seals, because even with the same roughness, different surface shape characteristics can lead to varying degrees of seal wear.

Hawo seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly affect their service life. We generally follow the standards prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump parts mating with the mechanical seal are as follows: 1) Shaft bending: Maximum not greater than 0.05 mm; 2) Rotor runout: Near the shaft sleeve at the dynamic ring seal circle, not greater than 0.06 mm; 3) Axial shaft movement is not allowed to exceed ±0.5 mm; if a shaft sleeve is present, the sleeve must not be loose; 4) Coupling alignment error: For gear couplings, not greater than 0.08–0.10 mm (P2008C); for elastic couplings, not greater than 0.05–0.06 mm; (common practice: face runout<0.05, radial runout<0.10) 5) Concentricity tolerance of the gland (static ring seat) and sealing spigot relative to the shaft centerline is 0.05 mm; perpendicularity tolerance of the plane contacting the gasket relative to the centerline is 0.03–0.05 mm. If requirements are not met, the seal chamber must be machined; 6) The end of the shaft sleeve installing the dynamic ring seal, and the end of the gland (or housing) installing the static ring seal, should be chamfered and smoothed. 7) Be careful when installing or removing mechanical seals; strictly prohibit the use of hammers and flat chisels to avoid damaging seal elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, take care during assembly and disassembly to avoid neglecting one side for the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the dynamic and static ring parts must be replaced and should not be retightened for continued use. Because after loosening, the original running track of the friction pair will change, and the sealing of the contact surface is easily compromised.

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