ansi 9standards0 code issues - ansi class 6 seats

huangyhg

ansi ansi  class 6 seats
hi,
when i was reading, i came across this ansi  class 6 seats
in valve section. may i know what is the specification it
refers to ?
hope to know.
bourne
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good day,
valves which are under high prssuer need more than one seat for insuring enough stability to the spindle.
i hope this information will be enough.