The plug arrangement determines whether
the three-way valve operates as mixing or
diverting valve.
In mixing valves, the media to be mixed en
-
ter the valve at the ports A and B. The mixed
flow leaves through the port AB.
1.1 Technical data
The amount of flow from A or B to AB and
vice versa is determined by the cross-sec
-
tional area between the seats and plugs.
The position of the plugs (3, 3.1, 3.2)
changes in response to changes of the con
-
trol signal acting on the actuator.
The plug stem is sealed by a bellows and an
additional packing (4.2) and connected to
the actuator stem (8.1) by the stem connec
-
tor (7).
EB 8135/8136 EN 5
Design and principle of operation
Nominal size DN 15 to 80 NPS ½ to 3
Material
Sph. gra
-
phite iron
EN-JS1049
Cast steel
1.0619
Stainless
steel
1.4408
Spheriodal
graphite
iron A 395
Cast steel
A 216
WCC
Stainl. steel
A 351
CF8M
Nominal pressure
PN 16 · PN 25 Class 150 · Class 300
End
connections
Flanges
EN 1092-1 Form B1,
Ra 3.2 to 12.5 µm
EN 1092-1, groove Form D
Raised face
Seat and plug sealing
Metal sealing
Characteristic
Linear
Rangeability
30:1 up to DN 25/NPS 1 · 50:1 for DN 32/NPS 1½ or larger
Temperature range
–10 to 350 °C 14 to 660 °F
Leakage rate
DIN EN 1349:
0.05 % of K
VS
coefficient
ANSI/FCI 70-2:
0.05 % of C
V
coefficient
Materials
Nominal size
DN 15 to 80 NPS ½ to 3
Valve body
Spheriodal
graphite iron
EN-JS1049
Cast steel
1.0619
Stainless
steel
1.4408
Spheriodal
graphite iron
A 395
Cast steel
A 216
WCC
Stainl. steel
A 351
CF8M
Valve bonnet
Cast steel S235JR (St 37) 1.4408 Cast steel S235JR (St 37) 1.4408
Seat and plug Seat
£
DN 25: 1.4305 ·
³
DN 32: 1.4104
£
NPS 1: 1.4305 ·
³
NPS 1½: 1.4104
Plug
1.4305
Bellows seal
1.4541 · 1.4301
Packing
PTFE
Body gasket
Graphite on metal core
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