Control valves
Pressure reducing/surplussing valves
Page 1 of 7
ISO 9001
TI-P004-01
CH Issue 6
Cert. No. LRQ 0963008
SDP143
Pilot Operated
Pressure Surplussing Valve with Cast Steel Body
Description
The SDP143 is a cast steel pilot operated pressure surplussing valve suitable for steam, air and industrial gasses (Note: It is not suitable
for oxygen service). The SDP143 controls by sensing the upstream pressure through a pressure sensing pipe taken from the union 29
which is clearly identified on page 2.
Sizes and pipe connections
DN15LC - Low Capacity version, DN15, DN20, DN25, DN32, DN40, DN50 and DN80.
Flanged to EN 1092 PN40, BS 10 Table 'J', ANSI 300 and ANSI 150.
Pressure / temperature limits
Kv values
A
B
D
The Kv maximum values shown below are full capacities and
should be used for safety valve sizing purposes only.
���
���
���
�
A-D-E Flanged EN 1092 PN40, ANSI 300 and BS 10 Table J.
A-B-C Flanged ANSI 150.
Note: Two colour coded pressure adjustment springs are
available for the following downstream pressure ranges:
Red 0.2 bar g to 17 bar g
Grey 16.0 bar g to 24 bar g
DN15LC DN15 DN20 DN25 DN32 DN40 DN50 DN80
Steam
saturation
curve
1.0
2.8
For conversion:
5.5
8.1
12.0
Cv (UK) = Kv x 0.963
17.0
28.0
64.0
Cv (US) = Kv x 1.156
C
E
�
��
���� ��
��
��
Pressure bar g
The product must not be used in this region.
Due to the material strength of the main diaphragm
chamber the product must not be used in this region.
Body design conditions
Maximum design pressure
Maximum design temperature
Minimum design temperature
A-B-C
A-D-E
PN40
17.2 bar g @ 40°C
A-D-E
for saturated steam service
A-B-C
Limited to
300°C @
300°C @
26 bar g
26 bar g
0°C
26 bar g
14 bar g
26 bar g
Maximum upstream pressure
Maximum operating temperature
Minimum operating temperature
0°C
Note: For lower operating temperatures consult Spirax Sarco
A-D-E
26 bar
Maximum differential pressure
Designed for a maximum cold hydraulic test pressure of 60 bar g
A-B-C
14 bar
Note: With internals fitted, test pressure must not exceed 40 bar g
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.
© Copyright 2008
Page 1 of 7
4.6.82
T
e
m
p
e
r
a
t
u
r
e
°
C
