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Design and principle of operation
Table 3-2: Materials · Material number according to DIN EN
Type 2423 E Valve balanced by a bellows
Pressure rating
Valve body
Seat
Up to DN 100
Plug
DN 125 to 250
Plug stem
Metal bellows
Bottom section
Body gasket
Type 2423 E Valve balanced by a diaphragm
Pressure rating
Valve body
Valve seat
Plug (standard version)
Pressure balancing
Type 2426 Actuator
Diaphragm cases
Diaphragm
Guide bushing
Type 5824 and Type 5825 Electric Actuators
Housing, housing cover
Coupling nut
DN 15, 25, 40 and 50 only
1)
Optionally with soft seal with standard K
2)
Special version 1.4409
3)
3-8
PN 16
PN 25
Spheroidal graphite
Cast iron
iron
EN-GJL-250
EN-GJS-400-18-LT
1.4104, 1.4006
1.4104, 1.4006
1.4571 · DN 125 and larger: 1.4404
P265GH
PN 16
PN 25
Spheroidal graphite
Cast iron
iron
EN-GJL-250
EN-GJS-400-18-LT
Red brass
· With EPDM soft seal, max. 150 °C or with PTFE soft seal, max.
3) 5)
Balancing cases made of sheet steel DD11 · EPDM balancing diaphragm, max.
150 °C or NBR diaphragm, max. 80 °C
1.0332
EPDM with fabric reinforcement · Special version for mineral oils: FKM
DU bushing
Plastic (PPO with glass fiber reinforcement)
coefficients
VS
Cast steel
1.0619
2)
1.4301, 1.4404 with PTFE seal
1.4301
Graphite on metal core
Cast steel
1.0619
6)
Red brass
3) 4)
150 °C
Brass
DN 65 to 100: 1.4006
4)
DN 65 to 100: 1.4104/1.4006
5)
DN 125 to 250 only
6)
PN 16, 25 and 40
Cast stainless
Forged stainless
steel 1.4408
steel 1.4571
1.4404
1.4404
1.4571
PN 16, 25 and 40
Cast stainless
steel 1.4408
6)
1.4301
PTFE
EB 3018 EN
1)
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