German bock seals bock models bock prices

bock seals are devices that prevent fluid leakage, consisting of at least one pair of faces perpendicular to the axis of rotation that remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism, along with auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; since rubber bellows have limited elastic force, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

Advantages of bock seals

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in a single step; even for the most complex oil seals, the manufacturing process is not complicated. Metal-cased oil seals only require processes such as stamping, bonding, insertion, and molding to combine metal and rubber into the required oil seal. 2) Oil seals are lightweight and consume little material. Each oil seal is a combination of thin-walled metal and rubber components, resulting in minimal material consumption and very light weight per seal. 3) Oil seals require small installation space and have small axial dimensions, making them easy to machine and allowing for compact machine design. 4) Oil seals offer good sealing performance and long service life. They have certain adaptability to machine vibration and spindle eccentricity. 5) Oil seals are easy to disassemble and convenient to inspect. 6) Oil seals are low-priced.

Precautions for bock seals

1) Preparation and precautions before startup: a. Comprehensively inspect the mechanical seal, as well as auxiliary devices and piping installations, to ensure they are complete and comply with technical requirements. b. Conduct a static pressure test on the mechanical seal before startup to check for leakage. If there is significant leakage, identify the cause and take measures to eliminate it. If this is ineffective, disassemble, inspect, and reinstall. The static test pressure is generally 2~3 kg/cm². c. Rotate the pump manually according to its rotation direction to check if it moves lightly and evenly. If rotation is difficult or stuck, check whether assembly dimensions are incorrect or installation is improper. 2) Installation and shutdown: a. Keep the seal chamber filled with liquid before startup. When conveying media that solidify, use steam to heat the seal chamber to melt the medium. Manual rotation must be performed before startup to prevent sudden startup from causing the soft ring to shatter. b. For mechanical seals utilizing an external seal oil system, start the seal oil system first. Stop the seal oil system last after shutdown. c. After stopping a hot oil pump, do not immediately stop the cooling water for the seal oil chamber and face seal. Wait until the oil temperature at the face seal drops below 80 degrees before stopping the cooling water to avoid damaging seal components. 3) Operation: a. If slight leakage occurs after the pump starts, observe for a period. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. b. The pump operating pressure should be stable, with pressure fluctuations not exceeding 1 kg/cm². c. During pump operation, avoid cavitation to prevent dry friction of the sealing faces and seal damage. d. Regularly inspect the sealing condition. During operation, if leakage exceeds the standard (no more than 5 drops/min for heavy oil, no more than 10/min for light oil), and there is no improvement trend within 2-3 days, stop the pump to inspect the sealing device.

bock seal 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 speed<0.1m/s. 2) Standard double-lip type: In addition to the usage characteristics of the aforementioned 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: Single-lip internal-cased rubber oil seal without a spring. Generally suitable for low-speed conditions where the sealing medium is lubricating grease. Linear speed ≤ 6m/s. 4) External-cased single-lip type: Single-lip external-cased rubber oil seal with a spring, featuring a thin waist, good follow-up capability, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa. Rotational axis speed ≤ 15m/s. 5) External-cased double-lip type: Double-lip external-cased rubber oil seal with a secondary lip, featuring a thin waist, good follow-up capability, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress, resistant to media pressure<0.05MPa. Rotational speed ≤ 15m/s. 6) Assembled single-lip type: External-cased oil seal formed by assembling inner and outer casings 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 hydrodynamic principles to 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 media 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, applicable as shaft end oil seals for high-pressure pumps. Under normal conditions, PV value ≤ 8. Rotational axis speed ≤ 15m/s.

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