In control valve there are two type of valve seat we can use metal to metal sea

In control valve there are two type of valve seat we can use
metal to metal seat & soft seat.On this valve seat i have
following doubt.

1)I have never seen practically the internal assembly of
valve so my doubt is that basically weather the seat is soft
seat or metal its basic MOC is same as valve body(SS or CS)
only in soft seat we are using PTFE ring & place on valve
seat & in metal this PTFE ring is not threr am i correct???????
2)what are the common general rule for using metal to metal
seat & soft seat,means its depend on process parameter like
liquid,gas, steam & on valve leakage class.

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In control valve there are two type of valve seat we can use metal to metal seat & soft seat.On..

Answer / mrinal

Ball valves operating up to a process maximum temperature of 200 deg. C shall have soft
seats, unless specified otherwise in the project specifications. Beyond this temperature,ball valves or isolation valves shall have metal seated.

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