German reiff seals reiff models reiff prices

reiff seals are a type of friction seal or stuffing box used to prevent liquid leakage between the shaft and bearing of compressors or other fluid handling equipment. They are also sealing devices installed to prevent leakage at the pump shaft and housing. Common types of shaft seals include packing seals, mechanical seals, and power seals. The shaft seal of a reciprocating pump is typically a packing seal. When transporting media where leakage is not permitted, diaphragm reciprocating pumps can be used. The shaft seals of rotary pumps (including vane pumps, rotor pumps, etc.) mainly consist of packing seals, mechanical seals, and power seals.

Advantages of reiff seals

1) The oil seal structure is simple and 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 skeleton 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 less material. Each oil seal is a combination of thin-walled metal and rubber components, resulting in minimal material consumption and very light weight. 3) The installation space for oil seals is small, with compact axial dimensions, making them easy to machine and allowing for compact machine design. 4) Oil seals offer good sealing performance and have 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.

Precautions for reiff seals

1) Preparation and precautions before startup: a, Conduct a comprehensive inspection to ensure that the mechanical seal, 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 eliminate it. If ineffective, disassemble, inspect, and reinstall. The general static test pressure is 2~3 kg/cm². c, Rotate the pump according to its direction of rotation to check if it moves smoothly and evenly. If rotation is difficult or stuck, check for errors in assembly dimensions and reasonable installation. 2) Installation and shutdown: a, Keep the seal chamber filled with liquid before startup. For 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 parts. 3) Operation: a, If slight leakage occurs after pump startup, observe for a period. If continuous operation for 4 hours does not reduce the leakage, 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 of the sealing surfaces and seal damage. d, Regularly inspect the sealing condition. During operation, if leakage exceeds the standard (heavy oil not more than 5 drops/min, light oil not more than 10/min), and there is no improvement within 2-3 days, stop the pump to inspect the sealing device.

Common issues with reiff seals

The perpetual pursuit for chemical equipment is achieving a leak-free seal, which has driven the increasing adoption of magnetic drive pumps and canned motor pumps. However, there is still a long way to go to truly achieve zero leakage, such as addressing the service life of isolation cans in magnetic drive pumps and shielding cans in canned motor pumps, material pitting corrosion issues, the need for sealing materials with good corrosion resistance, and the reliability of static seals. The following provides a brief introduction to basic conditions regarding sealing: 1. Sealing types For static seals, there are typically only two forms: gaskets and O-rings, with O rings being the most widely used; for dynamic seals, chemical pumps rarely use packing seals, relying primarily on mechanical seals. Mechanical seals are categorized into single-face and double-face, as well as balanced and unbalanced types. Balanced types are suitable for sealing high-pressure media (typically referring to pressures greater than 1.0MPa). Double-face mechanical seals are mainly used for media that are high-temperature, prone to crystallization, viscous, contain particles, or involve toxic volatiles. For double-face mechanical seals, a barrier fluid should be injected into the seal chamber, with its pressure generally 0.07 to 0.1MPa higher than the medium pressure. 2. Sealing materials The material for static seals in chemical pumps is generally fluororubber, with polytetrafluoroethylene materials used only in special cases. The material configuration of the rotating and stationary rings in mechanical seals is critical. It is not necessarily optimal to pair cemented carbide with cemented carbide; besides the high cost, it is also unreasonable if there is no hardness difference between the two. Therefore, it is best to select materials based on the characteristics of the medium (Note: The American Petroleum Institute API610 Eighth Edition provides relatively detailed specifications for typical configurations of mechanical seals and piping systems in Appendix D).

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