Discussion
Which type of safety valve is mainly used for low pressures, low capacity, stationary boilers of the Cornish types?
Answer: D
A dead weight safety valve is mainly used for low pressures, low capacity, stationary boilers of the Cornish type. In it a weight placed on the valve holds it on its seat, and the weight is lifted when the steam pressure rises, which makes it suited to low pressure. A spring loaded valve is used for higher pressure and for locomotives, a lever safety valve is used for stationary boilers with a heavier weight on a lever, and the high steam and low water valve gives a warning for both conditions, so the dead weight valve is the key.
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