14) Which part is used in Rams bottom safety valve to act when the steam pressure exceeds the set values and allow the steam to escape?

15) When the sprig is compressed by nuts on the pillars, by which object its length being adjusted?

16) What is the material of lever in safety valves?

17) How many steel bearing are used in a lever safety valve?

18) Which object is placed near the fulcrum end of the lever through which the load is adjusted?