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p
1
57
90
125
112
83
70...78
95
56
58
Type 44-2 (DN 15 to 25)
Body with screwed ends
2
Plug with plug seal
2.1
Balancing piston
2.4
Plug spring
2.6
Guide nipple
4
Coupling nut
12
Diaphragm rupture indicator
17
O-rings
27
Plug nipple
Screw plug for the inspection
28
bore
30
Valve body
35
Seat
Fig. 3: Functional diagram of Type 44-2 Pressure Reducing Valve as well as Type 44-3 and Type 44-
9 Safety Pressure Reducing Valves (SSV)
EB 2623-1 EN
30
4
116
35
p
2
2
2.1
2.6
2.4
134
130
17
134
27
130
126
125
56
Set point adjuster
57
Diaphragm plate nut
58
Lock nut
70...78 Set point spring(s)
83
Diaphragm stem
90
Diaphragm plate
95
Spring plate
Design and principle of operation
130
90
57
Type 44-9 SSV
Type 44-3 (DN 32 to 50)
Version with flanged valve body
112
Actuator housing
116
Control line
125
Operating diaphragm
126
Backup diaphragm
130
Housing screws
134
Seal
237
Distance ring
112
28
116
126
237
12
125
83
30
35
2
2.1
2.6
28
83
237
12
116
112
13
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