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Fail Safe Action Valve Controlling Natural Gas

Question

Specify the proper fail-safe action for the valves in the following services. Please explain your reasons.

A valve manipulates the flow of natural gas (combustible) to a furnace. Another valve manipulates the flow of combustion air to the same furnace._____________________________________.

Summary

The question belongs to Mechanical Engineering and it is about a valve manipulating the flow of natural gas to a furnace. Another valve manipulates the flow of air to the furnace. The fail safe valve is to be given.

 

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