German HYDORING seals HYDORING models HYDORING prices

HYDORING seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with the assistance of auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. There are mainly the following four types of components: a. Primary sealing elements: rotating ring and stationary ring. b. Auxiliary sealing elements: O-rings. c. Clamping elements: springs, thrust rings. d. Drive elements: spring seats and keys or fixing screws.

HYDORING seal principle

Since there is an oil film controlled by the lip of the oil seal between the oil seal and the shaft, this oil film has fluid lubrication characteristics. Under the action of liquid surface tension, the stiffness of the oil film causes the end in contact with air to form a meniscus, preventing the leakage of the working medium and thus achieving sealing of the rotating shaft. The sealing capability of the oil seal depends on the thickness of the oil film on the sealing surface; if the thickness is too great, the oil seal will leak; if the thickness is too small, dry friction may occur, causing wear on the oil seal and shaft; if there is no oil film between the sealing lip and the shaft, it is easy to cause heating and wear. Therefore, during installation, some oil must be applied to the sealing ring, and it must be ensured that the skeleton oil seal is perpendicular to the shaft centerline. If not perpendicular, the sealing lip of the oil seal will drain the lubricating oil from the shaft, which will also lead to excessive wear of the sealing lip. During operation, it is ideal for a slight amount of lubricant in the housing to seep out to achieve the formation of an oil film at the sealing surface.

HYDORING seal applications

Skeleton oil seals are widely used in industries such as aviation, automotive, motorcycles, railways, vehicles, ships, home appliances, and construction machinery. They are suitable for sealing rotary and reciprocating motions. Installed on various heavy-duty engines, gearboxes, axles, ships, cylinders, and other parts. Mainly prevents the penetration of sealed media (gas, liquid) and the entry of external foreign matter into the body. Precautions: The pressure bearing range of ordinary oil seals is very limited, generally 0.03 MPa. This pressure is generally formed by the height difference of the lubricating oil itself. If higher pressure needs to be sealed, high-pressure oil seals should be selected (generally can withstand up to 1 MPa pressure) or other sealing forms should be selected.

HYDORING seal installation technical requirements

Mechanical seals are high-precision mechanical components, and their correct installation and operation have a significant impact on their service life. We generally follow the standards prescribed by the Ministry of Petrochemical Industry. The technical requirements for the pump installing the mechanical seal and the 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 rotating ring seal ring, not greater than 0.06 mm; 3) Axial movement of the shaft is not allowed to exceed ±0.5 mm; if there is a shaft sleeve, the shaft sleeve is not allowed to 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; (customary practice axial runout<0.05, radial runout<0.10) 5) The concentricity tolerance of the gland (stationary ring seat) and the sealing mating spigot relative to the shaft centerline is 0.05 mm, and the perpendicularity tolerance of the plane in contact with the gasket relative to the centerline is 0.03～0.05 mm. If the requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the rotating ring seal ring is installed, and the ends of the gland (or housing) where the stationary ring seal ring is installed, should be chamfered and smoothed. 7) Be careful when installing and removing mechanical seals; it is strictly forbidden to use hammers and flat chisels to avoid damaging the sealing elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, take care of each other during assembly and disassembly to prevent neglecting one aspect. 9) For mechanical seals that have been in operation, if the gland becomes loose causing the seal to move, the rotating and stationary ring parts must be replaced and should not be retightened for continued use. Because after loosening, the original operating trajectory of the friction pair will change, and the sealing performance of the contact surface is easily damaged.

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