Samson 42-34 Mounting And Operating Instructions page 14

Design and principle of operation
Type 42-34 · Type 42-38 · DN 15 to 250 · Balanced by a bellows
Type 42-34
DN 15 to 250
22
4
7
Type 2424 Actuator
20
21
+
16
17
Fig. 2: Functional diagram of valve balanced by a bellows
14
1.3
1.1
1.2
Type 2423 Valve,
balanced by a
bellows
1.4
2
3
1
8
5
9.1
9
10
11
12.1
_
18
19
15
13
14
12.2
1 Valve body
1.1 Flow set point adjustment
(set point screw)
1.2 Lock nut
1.3 Cap
1.4 Restriction
2 Seat
3 Plug
4 Plug stem
5 Balancing bellows
11
12.1
+
Type 2428 Actuator
7 Spring
8 Screw plug (balanced by a bel-
lows, DN 125 and larger)
9 Low-pressure control line (up to
DN 100)
9.1 Low-pressure connection (DN 125
and larger)
10 Connecting piece (up to DN 100)
11 Coupling nut
12.1 Diaphragm stem
12.2 Diaphragm stem
13 Operating diaphragm
14 Actuator housing
15 Screws
16 Set point springs
17 Set point adjustment for differential
pressure (set point adjuster)
18 Nut
19 Diaphragm plate
20 Force limiter
21 Internal excess pressure valve
22 Blanking plug at side
Type 42-38
DN 15 to 100
_
16, 20
13
19
21
18
EB 3013 EN