Nonmetal materials, mainly PTFE, are employed as seats in KITZ ball valves. Each seat material has its own pressure rating, independent of the rating for the valve body.
Ball valves can only be used within a range of values that satisfies both the above-mentioned ratings. If, for example, your selected valve employs rubber O-rings as stem and seat retainer seals, then the rated range for that valve is the lower of the two values.

♦Body Ratings (Material Ratings)
As specified in JIS B ***0, JIS B ***9 and JIS B ***0 and ASME B*6.*4.
♦Seat Ratings
According to the ball seat material type and valve size.

 

 

The nominal pressure values indicated in the above table denote the identification codes for classification of pressure, not the actual pressure values.