German alw seals alw models alw prices

alw seals are sealing devices installed to prevent leakage between the pump shaft and the housing. Common shaft seal types 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, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly 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, a diaphragm reciprocating pump can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly include packing seals, mechanical seals, and power seals.

alw seal advantages

1) Oil seals have a simple structure and are easy to manufacture. Simple oil seals can be molded in one 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, inlaying, 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, consuming very little material, so each oil seal is very light. 3) The installation space for oil seals is small, with small axial dimensions, making them easy to machine and allowing for compact machine design. 4) Oil seals offer good sealing performance and a long service life. They have certain adaptability to machine vibration and main shaft eccentricity. 5) Oil seals are easy to disassemble and convenient to inspect. 6) Oil seals are inexpensive.

alw seal precautions

1) Preparation and precautions before startup: a. Comprehensively check whether the mechanical seal, as well as auxiliary devices and pipeline installations, are complete and comply with technical requirements. b. Perform 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. Generally, the static test pressure is 2~3 kg/cm². c. Rotate the pump according to its direction of rotation to check if it moves lightly and evenly. If rotation is difficult or stuck, check whether the assembly dimensions are incorrect and whether the installation is reasonable. 2) Installation and shutdown: a. Keep the seal chamber filled with liquid before startup. When transporting media that solidify, use steam to heat the seal chamber to melt the media. 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 the seal parts. 3) Operation: a. If slight leakage occurs after the pump starts, observe for a period of time. If the leakage does not decrease after continuous operation for 4 hours, stop the pump for inspection. b. The operating pressure of the pump should be stable, with pressure fluctuations not exceeding 1 kg/cm². c. During pump operation, avoid cavitation to prevent dry friction on the sealing surfaces and seal damage. d. Regularly check the sealing condition. During operation, if leakage exceeds the standard (not more than 5 drops/min for heavy oil, not more than 10/min for light oil), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

alw 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 occasions, 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 occasions, linear speed ≤15m/s. 3) Springless type: Springless single-lip internal-cased skeleton rubber oil seal. 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 skeleton rubber oil seal with spring, featuring a thin waist, good follow-up performance, and good rigidity. Standard oil seals are used in environments with less dust and impurities, resistant to media pressure<0.05MPa occasions. Rotating shaft linear speed ≤15m/s. 5) External-cased double-lip type: Double-lip external-cased skeleton rubber oil seal with auxiliary lip, featuring a thin waist, good follow-up performance, high rigidity, and good concentricity. Standard oil seals with a dust lip can prevent dust ingress, resistant to media pressure<0.05MPa occasions. Rotational speed ≤15m/s. 6) Assembled single-lip type: External-cased oil seal formed by assembling inner and outer skeletons with rolled edges, featuring 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 fluid dynamics principles to generate a unidirectional pumping action with a return flow effect. Related to the shaft's direction of rotation, the radial force is smaller than that of standard oil seals due to the return flow effect, reducing wear and heat generation, and extending service life. Suitable for media pressure<0.05MPa occasions, rotational speed ≤20m/s. 8) Pressure-resistant type: Short lip and short, thick waist, providing pressure resistance, working pressure ≤3MPa. Suitable for occasions with media pressure ≤3MPa, suitable for shaft end oil seals of high-pressure pumps. Generally, the PV value ≤8. Rotating shaft linear speed ≤15m/s.

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