Answer / amit uapdhyay

it is a critical parameter of designing of orifice. & it must be not greater the .7

unit less a factor defined as === d/D

D- pipe dia
d- orifice plate hole dia.

Answer / rampal

Beta is a ratio of orifice dia to inside pipe dia.

Beta = d/D

Answer / r_vaya

Beta Ratio is the Ratio between the line inner diameter to bore size of the orifice.

Orifice dia / pipe dia 

The flow coefficient is founds to be stable between beta ratio of 0.2 to 0.7 below which the uncertainity in flow measurement increases.

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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with the help of suitable diagrams different types of control valves

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