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  Overview of mechanical seals
Cartridge mechanical seals
Mechanical seals are successfully used in the fuel-and-energy, gas, oil, chemical, petrochemical, food, and pulp-and paper industry. Working resource of the seals varies from 10 to 40 thousand hours, depending on operating conditions. Use of the seals allows of prevention gas and fluid leakage into a gap between a shaft and a frame of a hydraulic machine.

Bellows mechanical seals
Single cartridge bellows face seals
are meant for sealing chemically aggressive liquids at the temperature of medium to 425ºC. The single bellows mechanical seals have an opening for medium recirculation, a hole for inlet and outlet of steam or water behind the sealing faces, and a carbon-graphite floating bushing, which restrains steam or water leakage to bearings and drains leakages.
Double cartridge bellows face seals are meant for sealing inflammable chemically aggressive liquids at the temperature to 425ºC. Double face seals with bellows may work both in double mode, when the pressure of parting liquid is higher than the pressure in the sealing chamber, and in tandem mode, when the pressure of parting liquid is lower than the pressure in the sealing chamber. Weld bellow is the main element of the face seal. Thank to use of bellows secondary rubber seals are unnecessary, that is why the temperature rate is considerably wider. In comparison with spring face seals the weld bellow is more resistant to coking and bending. The load on the bellows face seals gets lower, and heat buildup goes down.

Temperature of the pumping medium, ºC to 425
Pressure, kilogram*force/cm2 to 50
Rotary velocity, m/s to 50
Maximum available leakage, ml/hour 0.5

Gas face seals
Until recently gas seals were mainly associated with compressors, but at present they can hermetically seal any equipment:
- For pumps transfering liquids, which contain solid particles or have low lubricating properties such as carbongraphites.
- As additional emergency seal.
- For slowly rotating shafts of mixers and chemical and pharmaceutical reactors, where the process is sterile and the leakage of sealing liquid is excluded.
Our company supplies the gas seals, which fit the strictest requirements and do not emit the harmful substances. Moreover they are cost-efficient, though the service life is long and operating charges are low as well as capital outlays.
In general the design and action of the gas seal is the same as of the mechanical seal. The only difference is that the sliding surfaces, lubricated by gas (air or nitrogen), are wider. It is attained by use of the special configuration of V- and U-type grooves on the sliding surface. At the minimal rotary speed a stable gas film covers a sealing gap. The film prevents the contacting of the sliding surfaces and moves without wear. The power consumption of the gas seals is approximately 95% lower, than the consumption of the liquid-lubricated seals.
Lubrication and cooling of multistage seals do not require expensive facilities of sealing fluid supply. The pressure of the sealing gas exceeds the pressure of the product to 5-10% and prevents leakages of working medium. Narrow gap (about 3 µm) between the sliding surfaces allows to minimize the flow rate of gas, which substantially depends on pressure, rotary speed and diameter of the seal.

Shaft diameter, mm from 17 to 320
Temperature of the pumping medium, ºC from -170 to +500
Pressure of the pumping medium, kilogram*force/sm2 to 350
Rotary velocity, m/s to 200
Shaft speed, RPM to 10.000
Maximal available leakage, ml/hour no leakages

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