Why main engine exhaust valve does not have spring ?

In this article ,I have mentioned why main engine exhaust valve does not have spring ? Or why there is no spring in exhaust valve of main engine ?

  1. Spring required for exhaust valve will be large with large diameter & the coil diameter is also thick.Heavy coils will be under the effect of bending and twisting critically at every revolution.
  2. If there is large spring then large india is also required to open which lead to sluggish operation.
  3. Spring may break frequently and seat of the valve get damaged.This causes ineffective tight sealing of face.

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