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1.2
3.2
3.3
p
1
3.1
1.3
3.5
15
16
6.1
6
13
7
17
Type 44-4 SEV
1
Valve body
1.1 Stopper
1.2 Seal
1.3 Seal
2
Seat
3
Plug with seal
3.1 Balancing piston
Fig. 3:
Functional diagram of Type 44-7 Excess Pressure Valve as well as Type 44-4 Safety Excess
Pressure Valve (SEV)
EB 2723 EN
Type 44-7 (DN 32 to 50), flanged valve body
1.1
1
3
2
5
11
+
Turned
into the
plane of
projection
3.2 Plug nut
3.3 Plug stem
3.4 Plug spring
3.5 Plug nipple
3.6 Guide nipple
5
Inspection bore
6
Actuator housing
Design and principle of operation
p
2
DN 15 to 25, plug section
5
6.2
14
12
6.1
11
7
6.1 Operating diaphragm
6.2 Backup diaphragm
7
Diaphragm stem
8
Set point spring(s)
9
Spring plate
10
Set point adjuster
11
Control line
7
8
9
10
3.1
3.3
3.4
3.6
Diaphragm rupture
12
indicator
13
Housing screws
14
Distance ring
15
Diaphragm plate nut
16
Diaphragm plate
17
O-rings
13
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