German Hannen & Stein seals, Hannen & Stein models, Hannen & Stein prices

Hannen & Stein seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the rotation axis maintaining contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals. When the auxiliary seal of the compensation ring is a metal bellows, it is called a bellows mechanical seal. It mainly consists of 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.

Introduction to Hannen & Stein seals

A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reaction vessels, and compressors. Since the drive shaft passes through the interior and exterior of the equipment, there is a circumferential gap between the shaft and the equipment. The medium inside the equipment leaks outward through this gap; if the pressure inside the equipment is lower than atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is required to prevent leakage. There are many types of shaft seals. Due to advantages such as low leakage and long service life, mechanical seals are the primary shaft sealing method for these equipment worldwide. Mechanical seals are also known as face seals. They are defined in relevant national standards as: "a device that prevents fluid leakage, formed by at least one pair of end faces perpendicular to the rotation axis maintaining contact and sliding relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, in conjunction with auxiliary seals."

Structure and composition of Hannen & Stein seals

1) Main components: rotating ring, stationary ring, cooling device, and clamping spring (depending on the specific equipment). 2) Auxiliary sealing elements: O-rings (including O-shape, X-shape, U-type, wedge shape, rectangular flexible graphite, PTFE-covered rubber O-rings, etc.). 3) Elastic compensation mechanism: springs, thrust rings. Spring seats and keys or various screws. 4) Classification: divided into single-face and double-face; balanced and unbalanced; arbitrary rotation direction and fixed rotation direction.

Technical requirements for installation of Hannen & Stein seals

Mechanical seals are high-precision mechanical components, and their correct installation and operation significantly impact their service life. We generally follow the standards specified 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 location, not greater than 0.06 mm; 3) Axial shaft movement must not exceed ±0.5 mm; if a shaft sleeve is present, the shaft 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: axial runout<0.05, radial runout<0.10) 5) Concentricity tolerance of the gland (stationary ring seat) and the sealing spigot relative to the shaft centerline: 0.05 mm; perpendicularity tolerance of the surface contacting the gasket relative to the centerline: 0.03–0.05 mm. If requirements are not met, the seal chamber must be machined; 6) The ends of the shaft sleeve where the rotating ring O-ring is installed, and the ends of the gland (or housing) where the stationary ring O-ring is installed, should be chamfered and smoothed. 7) Exercise caution when installing or removing mechanical seals. Do not use hammers or flat chisels to avoid damaging sealing elements. If scale prevents removal, clean thoroughly before disassembly. 8) If mechanical seals are used on both ends of the pump, coordinate during assembly and disassembly to avoid neglecting one side while attending to the other. 9) For mechanical seals that have been in operation, if gland loosening causes seal movement, the rotating and stationary ring components must be replaced. Do not simply retighten and continue use. Because after loosening, the original operating trajectory of the friction pair changes, easily compromising the sealing integrity of the contact surfaces.

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