Control valves
Self-acting controls
Page 8 of 12
Valve model
BXRA
SBRA
Optional bleed
available
NRSA Double
seated valve
Size and pipe connections
Screwed
BSP / NPT
1⁄2"
1⁄2"
3⁄4"
1"
21⁄2"
Flanged
PN25 / ANSI150
DN65
Body design
rating
PN25
PN25
PN25
PN25
PN25
Balanced
Kvs
0.59
2.58
3.86
6.80
65.00
Maximum
P (bar)
10.3
12.0
7.0
4.7
2.7
Stroke
mm
3.2
3.2
4.0
5.0
9.5
Control system options
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•
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•
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3"
11⁄2"
2"
DN80
PN25
PN25
PN25
PN25
PN25
•
•
•
94.00
23.70
16.48
23.70
34.00
2.0
1.7
9.0
8.2
6.9
9.5
9.0
8.0
9.0
9.5
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KX51
Optional bleed
available
1"
PN25
9.80
3.5
5.6
•
•
•
•
•
•
11⁄4"
11⁄2"
PN25
16.48
2.3
8.0
•
•
•
•
•
•
34.00
KY51*
Balanced by
phosphor
bronze bellows.
Optional bleed
available
2"
11⁄4"
PN25
1.1
9.5
•
•
•
•
•
•
•
•
•
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4.5.9
Valve model
BMFRA
Size and pipe connections
Screwed
Flanged
BSP / NPT
PN16
1"
11⁄4"
11⁄2"
DN20
DN25
DN32
Body design
rating
PN16
PN16
PN16
Balanced
Kvs
4.64
9.80
16.48
Maximum
P (bar)
7.0
3.5
2.3
Stroke
mm
4.0
5.6
8.0
•
•
Control system options
1⁄2"
1⁄2"
PN16
PN16
•
•
•
•
•
•
•
•
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•
DN15
0.59
2.90
KX31 screwed
and
KX33 flanged.
Optional
bleed
available
3⁄4"
10.3
12.0
3.2
3.2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
DN40
PN16
23.70
1.7
9.0
•
•
•
•
•
•
2"
11⁄2"
2"
PN16
PN16
PN16
•
•
•
34.00
23.70
34.00
1.1
9.0
8.2
6.9
9.5
8.0
9.0
9.5
•
•
•
•
•
•
•
•
•
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11⁄4"
DN50
PN16
KY31* screwed
and KY33*
flanged balanced
by phosphor
bronze bellows.
Optional bleed
available.
16.48
•
•
•
•
•
•
Valve selection data
Table 6 Normally closed valves for cooling applications
For pressure temperature relationships please refer to the pressure / temperature charts in Table 4, page 5.
Gunmetal
Cast iron
* Please note: The KY31, KY33, and KY51 can also be used on water applications where high P conditions exist.
2-Port Self-acting Temperature Control Valve Selection
for Heating and Cooling Applications
TI-S21-07 CH Issue 1
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