34 Fig. 2.1 shows a steam safety valve. When the pressure gets too high, the steam lifts the weight W and allows steam to escape. (a) Explain, in terms of moments of forces, how the valve works. (b) The moment of weight W about the pivot is 12 N m. The perpendicular distance of the line of action of the force of the steam on the valve from the pivot is 0.2 m. The area of the piston is 0.0003 m2. Calculate (i) the minimum steam force needed for the steam to escape, (ii) the minimum steam pressure for the steam to escape.

34 Fig. 2.1 shows a steam safety valve. When the pressure gets too hig

1.	34 Fig. 2.1 shows a steam safety valve. When the pressure gets too high, the steam lifts the weight W and allows steam to escape. (a) Explain, in terms of moments of forces, how the valve works. (b) The moment of weight W about the pivot is 12 N m. The perpendicular distance of the line of action of the force of the steam on the valve from the pivot is 0.2 m. The area of the piston is 0.0003 m2. Calculate (i) the minimum steam force needed for the steam to escape, (ii) the minimum steam pressure for the steam to escape.
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