12) Where the seat is secured in a vertical hollow pipe in a dead weight safety valve?

13) Spring loaded safety valve is also called?

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?