Pump valve seals (also known as pump valve diaphragms, pump valve seals or oil seals) refer to the sealing parts used in pumps and valves and other equipment, and their function is to prevent medium leakage.
Linde Polymer tells you that different models of pump valve seals have different structures and characteristics, so they need to be considered on a case-by-case basis when choosing. The following will introduce several common pump valve seal models and their differences.
Packing seals (also known as packing seals or oil seals)
Packing seal is a traditional sealing method, which achieves sealing by filling a certain packing material to fill the sealing cavity. Common models of packing seals are soft package packing seals, metal bellows packing seals, metal bellows rubber packing seals, etc.
Different filler materials can be applied to different media, such as graphite filler can be applied to high temperature and high pressure medium, PTFE filler can be applied to strong corrosive medium.
The advantages of packing seals are simple structure, easy installation and wide range of application, but their disadvantages are easy to leak, relatively short life, and need to be regularly overhauled and replaced with packing.
Mechanical seals (also known as mechanical seals or oil seals)
Mechanical seal is a kind of seal that is sealed by mechanical means, which can effectively prevent leakage, and has a relatively long life, suitable for harsh working conditions such as high speed, high temperature and high pressure.
Common models of mechanical seals are single-acting mechanical seals, double-acting mechanical seals, floating mechanical seals, elastic mechanical seals, etc.
Different types of mechanical seals are suitable for different working conditions and media, such as single-acting mechanical seals suitable for low-pressure and low-speed media, and double-acting mechanical seals suitable for high-temperature and high-pressure media.
The advantages of mechanical seals are good sealing performance, long life, not easy to leak, no need for regular maintenance and replacement of fillers, etc., but their disadvantages are complex structure, difficult installation, and the need for precision machining.
Bellows seals (also known as bellows seals or oil seals)
Bellows seal is a kind of seal using bellows as a sealing element, its structure is simple, easy to install, suitable for high temperature, high pressure, high corrosion and other harsh working conditions.
Common models of bellows seals are metal bellows seals, rubber bellows seals, etc. Different types of bellows seals are suitable for different media and temperature ranges, such as metal bellows seals are suitable for high temperature and high pressure media, and rubber bellows seals are suitable for low temperature and low pressure media.
The advantages of bellows seals are good sealing performance, long life, and can adapt to different working conditions and media, but its disadvantage is that the bellows is susceptible to corrosion, easy to fatigue and crack, and the sealing performance is affected by the deformation of the bellows.
Magnetic seals (also known as magnetic seals or oil seals)
Magnetic seal is a kind of seal that uses magnetic force as sealing force, its structure is simple, no leakage, long life, suitable for high-speed, high temperature, high pressure, flammable and explosive and other dangerous media pumps and valves.
Common models of magnetic seals include external magnetic seals, built-in magnetic seals, etc. Different types of magnetic seals are suitable for different media and working conditions, such as external magnetic seals for high-temperature media, built-in magnetic seals for high-pressure media.
The advantages of magnetic seals are good sealing performance, long life, no leakage, safety and reliability, no need for regular maintenance and replacement of packing, etc., but their disadvantages are complex structure, high cost, and the need to use special magnetic drive devices.
The above are several common pump valve seal models and their differences. When selecting pump valve seals, it is necessary to consider the nature of the medium, working conditions, safety requirements, economy and other factors, and select the appropriate sealing ring model and material to achieve the best sealing effect and economic benefits.
At the same time, regular inspection and maintenance are required during use, and worn or aging seals are replaced in time to ensure the normal operation and safe production of the equipment.
