A thermostatic steam trap utilizes a sealed, corrugated metal bellows filled with a volatile fluid. Its purpose is to automatically discharge cooler water (condensate) from a steam line while preventing the loss of live steam. Arrange the following events in the correct operational sequence, starting from a cold system startup and ending with the trap sealing off the steam.
- 1Cold condensate and air flow freely through the trap body because the thermal bellows remains fully contracted.
- 2High-temperature steam reaches the trap body, rapidly heating the external surface of the bellows.
- 3The volatile fluid inside the bellows vaporizes and expands, generating internal pressure that forces the bellows to elongate.
- 4The mechanical expansion of the bellows drives the attached valve plug into the seat, closing the trap.
Cevap
The correct sequence starts with the cold condensate flowing through the open valve (contracted bellows), followed by steam entering and heating the bellows. This causes the internal fluid to undergo rapid thermal expansion, which finally elongates the bellows and drives the valve closed.
The thermostatic trap relies on temperature differences. It starts open when cold (contracted), receives heat from the incoming steam, utilizes the rapid thermal expansion of its internal fluid to create mechanical force, and uses that force to drive the valve closed.
Adım Adım Çözüm
Anahtar Kavram
Thermal expansion of fluids can be harnessed to generate mechanical force and actuate valves in response to temperature changes.
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