Control systems Control valves
4
Q series control valve selection guide:
DN15 and DN20 (mixing service only)
Valve size
DN25
DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN120, DN150 and DN200 (mixing and diverting service)
Valve series
Q
Q = Q series 3-port
Valve characteristic
L
L = Linear
3 = Cast iron
4 = Carbon steel 6 = Stainless steel 7 = SG iron
Body material
4
Connections
3
3 = Flanged
D = Diverting
3-port design
M
M = Mixing
Blank = Standard PTFE chevron H = Graphite packing
Stem sealing
B1 = PN16 bellows seal B2 = PN25 bellows seal
4.1 121
Blank = Standard metal-to-metal W = Hard facing (stellite) G = Soft seal (PTFE)
Seating option
Blank = Standard
Other options
X = Extended bonnet
Flow coefficient
Kv10
To be specified
Connection type
PN40
To be specified
Selection example: DN25 Q L
4
3
M
Kv10
PN40
How to order Example: 1 off Spirax Sarco DN25 QL43M Kv10 flanged to PN40.
TI-P359-14 CTLS Issue 8
Page 9 of 11
QLM and QLD Three-port Control Valves
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