German NOVATEX seals NOVATEX models NOVATEX prices

NOVATEX seals refer to devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation 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. Mechanical seals where the auxiliary seal of the compensation ring is a metal bellows are called bellows mechanical seals. There are mainly the following four types of components. a. Main 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.

NOVATEX seals introduction

Mechanical seals are shaft sealing devices 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: "devices that prevent fluid leakage, formed by at least one pair of end faces perpendicular to the axis of rotation 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."

NOVATEX seals structure and composition

1) Main components: rotating ring, stationary ring, cooling device, and clamping spring (depending on the specific equipment). 2) Auxiliary sealing elements: sealing 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.

NOVATEX seals specifications and applications

1) Standard single-lip type: generally used for sealing mineral oil, water, and other media in high- and low-speed rotating shafts and reciprocating motion. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa, maximum linear speed 15m/s, reciprocating motion speed<0.1m/s. 2) Standard double-lip type: 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, resistant to media pressure<0.05MPa, 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 type: single-lip outer-exposed cage rubber oil seal with spring, featuring a thin waist, good followability, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa. For rotational axis speeds ≤ 15m/s. 5) Outer-cage double-lip type: double-lip outer-exposed cage rubber oil seal with secondary lip, featuring a thin waist, good followability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress, resistant to media pressureFor applications with 0.05MPa. Rotational speed ≤ 15m/s. 6) Assembled single-lip type: An outer skeleton oil seal assembled from inner and outer skeletons with rolled edges, featuring high installation precision, fast heat dissipation, and heavy-load characteristics. Suitable for heavy-load operating conditions under high temperature and high speed, with medium pressure ≤ 0.05MPa and maximum linear velocity ≤ 15m/s. 7) Unidirectional return flow type, right-hand and left-hand rotation: Angled diagonal ribs are manufactured on the air side of the lip. Utilizing fluid dynamics principles, they generate a unidirectional pumping action with a return flow effect. Related to the shaft's direction of rotation, the return flow effect results in lower radial force compared to standard oil seals, reducing wear and heat generation and extending service life. Suitable for medium pressure<0.05MPa, rotational speed ≤ 20m/s. 8) Pressure-resistant type: short lip and short, thick waist, providing pressure resistance, working pressure ≤ 3MPa. Suitable for applications with media pressure ≤ 3MPa, suitable for shaft end oil seals of high-pressure pumps. Generally, the PV value ≤ 8. Rotational axis speed ≤ 15m/s.

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