What is the Difference between a Balanced and Unbalanced Mechanical Seal?

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What is the Difference between a Balanced and
Unbalanced Mechanical Seal?
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Balanced mechanical seal
Difference between a Balanced and Unbalanced
Mechanical Seal

• Here we describe the difference between a
  balanced and unbalanced mechanical seal.
  The mechanical seal is the most important and
  most used part. If you check its specification
  and type, then it can be classified into balanced
  and unbalanced mechanical seals.
• Before we check their difference, lets
  understand what mechanical seal balance is first.
  It is the load that acts across the seal faces.
  This load between the seal faces should be
  optimum.
• If the load is exceptionally high, then the
  liquid film gets oozed out. When it vaporizes, it
  causes unstable conditions. Because of the
  thermos-electrical instability, there is high
  wear and tear on the sealing surface.

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• When the seal is balanced, it avoids this
  situation and leads to reduce energy consumption.
  It extends the life of the seal. The pressure in
  a stuffing box is applied equally in all
  directions. This pressure keeps the primary ring
  stable against the mating or rotating ring.
• In case of high pressure, it is possible to lower
  it by reducing the diameter of the shoulder on
  the sleeve or by decreasing the seal hardware.
• The face area or opening area of a balanced seal
  is the same as an unbalanced seal. But the
  closing area is maintained in proportion to the
  face area. When the closing area reduces, the
  closing force also reduces proportionately. Thus,
  less heat is generated, and the seal has an
  extended life.

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Unbalanced mechanical seal

• In an unbalanced seal scenario, a multiple times
  higher hydraulic closing force is generated by
  the actual pressure sealing the two faces. Though
  an unbalanced seal is more stable as compared to
  a balanced seal, the chances of wear are high if
  the closing force on the seal faces goes beyond a
  limit. It wears out the lubricating film and it
  squeezes out. The dry seal fails because of the
  heavy load. The unbalanced seal is always without
  a shoulder.

Unbalanced mechanical seal

• Both Mechanical sealing types are popularly used
  in different mechanical applications. Here you
  know the difference between balanced/unbalanced
  mechanical seals.

Heat Generation It is more in unbalanced
seals.
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• Seal life
• It is more in balanced seals.
• Vibration and stability
• Unstable seals are more stable and aligned
• Liquid handling capacity
• Unbalanced seals are capable of handling high
  capacities of high-lubricity fluids. On the other
  hand, Balanced seals are capable of handling high
  capacities of poor lubricity fluids. Therefore,
  these seals are considered better for light
  hydrocarbons.
• Heat Generation
• The generation of heat across the face is more
  in unbalanced seals. The generation of heat
  across the surface is low in balanced seals.

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• Beston Seals is ISO certified company specializing
  in providing solutions to all types of leakages
  by manufacturing mechanical seals and sealing
  components as per customers drawings, samples,
  or requirements. We are one of the best rotary
  union and mechanical seal manufacturers in
  India based in Mumbai, Maharashtra. To know more
  about mechanical seals call on 91-9820007401 or
  email info_at_bestonseals.com.

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