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Table 3-2: Materials · Material number according to DIN EN
Type 2421 RS Valve
Pressure rating
Valve body
Seat and plug
Plug stem
Bottom section
Body gasket
Type 2420 RS Actuator
Diaphragm cases
Diaphragm
Guide bushing
Intermediate piece
Coupling pin
Seals
DN 15, 20 and 50/NPS ½, ¾ and 2 only
1)
For version free of graphite
2)
Table 3-3: K
coefficients
VS
Type 2421 RS Valve
Valve size
Valve size
K
coefficient
VS
C
coefficient
V
EB 3009 EN
PN 16, 25 and 40
Class 150/300
Cast steel 1.0619
1.0332
DU bushing
Sheet steel DD11
DN
15
20
25
NPS
½
¾
1
4.0
6.3
8.0
4.5
7.5
9.4
Design and principle of operation
Cast stainless steel 1.4408
Stainless steel 1.4404 with EPDM soft seal
Stainless steel 1.4301
Stainless steel 1.4404/1.4301
novatec
PREMIUM · UDP
®
EPDM with fabric reinforcement · FKM
Stainless steel 1.4301
EPDM · FKM
32
40
50
65
–
1½
2
2½
16
20
32
50
–
24
37
60
PN 40
Class 300
Forged stainless steel 1.4571
3620
®
2)
Stainless steel 1.4301
PTFE
Stainless steel 1.4301
80
100
125
150
3
4
–
6
80
125
190
280
94
145
–
330
1)
200
250
8
10
420
500
490
585
3-7
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