mechanical seal working principle
how does a mechanical seal work in a pump ？
First, let us back to mechanical seal basics. Mechanical seal types is important for a pumps which is used in petrochemical ,power, gas industry ect.
Mechanical seal working principle is rotating seal contact rotary seal , and rotate together. Spring pressure to make both seal always fit together. Secondary seal to help seal, too. That’s why mechanical seal can seal.
mechanical seal flush is crucial for cooling the all mechanical seal system. That make mechanical seal keep long use time. how to do a mechanical seal installation ?
gland packing vs mechanical seal
Packing seal is a traditional contact seal, which is widely used. The utility model has the advantages of simple structure, convenient replacement, low cost and wide application range.
For a mechanical seal pump, that can be a little leakage. Packing seal is usually used in clean water pumps. So, pump gland seal water pressure will have effect on leakage or not. Pump gland packing leakage rate depend on pressure, temperature and speed of pump.
Both mechanical seal working principle is different, because both types are different structure. And they will be selected different mechanical seal material.
Following is gland packing vs mechanical seal.We will choose oil, water as barrier liquid.
|Item||Packing seal||Mechanical seal|
|Use time||short||Need to replace packing and shaft in time||long||1~2 years|
|Shaft abrasion||Some||Shaft(sleeve) abrasion||Few||Shaft might wear rotary seal ring a little|
|Adjustment||Need||Always need to press gland and packing to be closed||No need||Both seal face fit , automatically.|
|Power consumption||Much||More abrasion face, more abrasion rate, higher power consumption||Little||Less abrasion face, less abrasion rate, lower power consumption|
|Structure||Simple||Less component||Complex||More component, High-precision|
|Installation||Easy||Not much difficult for installation||Difficult||Need experience and technology to install|
|replace||Easy||No need to disassemble pump to replace packing||Difficult||Need to assemble pump or entire system|
|Application scale||Small||Limit temp, pressure, speed not too much||Wide||Fit high temp, pressure, speed.|
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