Control valves
Self-acting controls
KX31, KX33, KY31 and KY33
Cast Iron
Self-acting Control Valves
Cert. No. LRQ 0963008
ISO 9001
Description
The KY31 and KY33 incorporate a pressure balancing bellows,
which enables the valve to operate against higher differential
pressures.
Available types
KX31 Normally closed with screwed connections.
KX33 Normally closed with flanged connections.
KY31
Normally closed with balancing bellows and screwed
connections.
KY33
Normally closed with balancing bellows and flanged
connections
Optional extras
Fixed bleed bypass on DN15 to DN50 valves for water systems:
KX31B, KX33B, KY31B and KY33B
The 'B' denotes the internal fixed bleed, if requested.
Standards
These products fully comply with the requirements of the
European Pressure Equipment Directive 97/23/EC and carry
the
mark when so required.
Certification
As standard these products are available with a manufacturers’
Typical Test Report. Note: All certification / inspection
requirements must be stated at the time of order placement.
Pressure / temperature limits
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Steam
The product must not be used in this region.
Sizes and pipe connections
KX31 1⁄2", 3⁄4", 1", 11⁄4", 11⁄2" and 2"
KY31 11⁄4", 11⁄2" and 2".
Screwed BSP (BS 21 parallel) or NPT.
KX33 DN15, DN20, DN25, DN32, DN40 and DN50
KY33 DN32, DN40 and DN50.
Flanged EN 1092 PN16 and BS 10 Table F.
KX31
Sizes 1⁄2" - 1"
saturation
curve
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Sizes 11⁄4" - 2"
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TI-P078-01
CH Issue 8
4.5.32
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Body design conditions
Maximum design pressure
Maximum design temperature
Minimum design temperature
Maximum operating temperature
PN16
16 bar g @ 120°C
220°C @ 13 bar g
-10°C
220°C
0°C
Optional extra
KY31
Sizes 11⁄4" - 2"
Pressure bar g
Minimum operating temperature
Note: For lower operating temperatures consult Spirax Sarco
Size
DN15 DN20 DN25 DN32 DN40 DN50
Maximum KX31
12.0
7.0
3.5
2.3
differential KX33
12.0
7.0
3.5
2.3
pressure KY3
1
-
-
-
9.0
bar
KY3
3
-
-
-
9.0
Designed for a maximum cold hydraulic test pressure of 24 bar g
1.7
1.1
1.7
1.1
8.2
6.9
8.2
6.9
Local regulations may restrict the use of this product to below the conditions quoted.
In the interests of development and improvement of the product, we reserve the right to change the specification without notice.
Optional extra
© Copyright 2007
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KX31
