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Pressure and temperature ratings take into account function and price to help our customers easily select the most suitable valve for their work.
The pressure and temperature ratings refer to the relation between the fluid temperature and the maximum pressure each valve can withstand at that temperature. Products are grouped by material, and each is shown with its rating.
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 2220, JIS B 2239 and JIS B 2240 and ASME B16.34.
♦Seat Ratings
According to the ball seat material type and valve size.
Standard
Designation
Nominal pressure
Remarks
JIS
(Japan)
K
5, 10, 16, 20, 30
Steel
5, 7.5, 10, 16, 20
Cast iron : for 7.5 water pipe
5, 10, 16
Copper alloy
ASME
(USA)
Class
75, 150, 300, 400, 600, 900, 1500, 2500, 4500
Steel
125, 250
Cast iron: for 7.5 water pipe
150, 300, 400, 600, 900, 1500, 2500
Copper alloy
DIN
(Germany)
PN
2.5, 6, 10, 16, 25, 40, 63, 100
Steel
2.5, 6, 10, 16, 25
Cast iron: for 7.5 water pipe
BS
(UK)
Class
150, 300, 400, 600, 900, 1500, 2500
Steel
PN
2.5, 6, 10, 16, 25, 40
Steel, cast iron, copper alloy
The nominal pressure values indicated in the above table denote the identification codes for classification of pressure, not the actual pressure values.
Standard No.
Title
Outline
B 2220
Steel pipe flanges
1)
Types
2)
Relation between fluid temperature and maximum working pressure
3)
Standard dimensions
4)
Materials
B 2239
Cast iron pipe flanges
B 2240
General rules for copper alloy pipe flanges
Standard No.
Title
Outline
B16.1
Cast iron pipe flanges
1)
Types
2)
Pressure-Temperature Rating
3)
Shape and dimensions
4)
Materials
B16.5
Steel pipe flanges
B16.24
General rules for copper alloy pipe flanges
(1)In the case of JIS, for example, if you select a bronze valve with a nominal pressure of 5 kg, you can use it to an upper limit of 0.7 MPa in a static fluid at 120°C or lower. Likewise, in the case of an ASME Class 150 valve, you can use it to an upper limit of 1.96 MPa within a temperature range of -29 to 38°C for WCB material. Note that the nominal pressure is not the maximum permissible pressure. Before use, be sure to check the working pressure range of your valve in the written specifications or catalog.

(2)Safety margin for selection of nominal pressure
The specific information on the type and properties of the fluid will help you select a valve that best suits your requirements (pressure and temperature conditions) from several types. Given the specific operating conditions, the applicable nominal pressure is automatically or unequivocally given, except in special cases. When selecting an appropriate valve, add a safety margin to these pressure / temperature ratings. In general, it is advisable to allow a safety margin of 20% or 0.3-0.4 MPa, whichever is smaller, with respect to pressure, and a margin of about 25°C with respect to temperature. Exceptions occur in the following cases: at the outlet of a compressor or at the connection point to a heat exchanger, the greater or maximum surging value should be used.