Samson 3730-4 - Page 27

EB 8384-4 EN 27
Attachment to the control valve – Mounting parts and accessories
4.3 Attachment according to
VDI/VDE3847
Type3730-4xxx0xxxx0x0060xx and
Type3730-4xxx0xxxx0x0070xx Positioners
with air purging of the actuator's spring
chamber can be attached according to VDI/
VDE3847.
Type3730-4xxx0xxxx0x0000xx Positioner
without air purging of the actuator's spring
chamber can be attached according to VDI/
VDE3847.
This type of attachment allows the positioner
to be replaced quickly while the process is
running by blocking the air in the actuator.
The signal pressure can be blocked in the ac-
tuator by unscrewing the red retaining screw
(20) and turning the air blocker (19) on the
bottom of the adapter block.
Attachment to Type 3277 Actuator (see
Fig.6)
− Required mounting parts and accesso-
ries: Table4 on page50
Mount the positioner on the yoke as shown
in Fig.6. The signal pressure is routed to the
actuator over the connecting plate (12), for
actuators with fail-safe action "actuator stem
extends" internally through a bore in the
valve yoke and for "actuator stem retracts"
through external piping.
Only the Y1 port is required for positioner
attachment. The Y2 port can be used for air
purging of the spring chamber.
1. Place follower clamp (3) on the actuator
stem, align it and screw tight so that the
18.1
1
17.2
18
17
17.1
13.1
13
12
12.1
3
11.1
11
19
20
Exh.
1.1
1.2
1.1
1.2
1
2
6.2
6.1
6
4
6.3
5
1 Lever
1.1 Nut
1.2 Disk spring
2 Follower pin
3 Follower clamp
4 Blanking plug
5 Sealing plug
6 Adapter bracket
6.1 Screws
6.2 Formed seal
6.3 Screws
11 Cover
11.1 Vent plug
12 Connecting plate
12.1 Gasket
13 Adapter block
13.1 Screws
17 Turnboard
17.1 Formed seal
17.2 Screws
18 Blank plate
18.1 Screws
19 Air blocker
20 Retaining screw
Fig.6: Attachment according to VDI/VDE3847 onto Type3277 Actuator