14
EB 8111/8112 EN
Design and principle of operation
3 Design and principle of oper-
ation
The single-seated Type 3321 Globe Valve is
preferably to be combined with the following
SAMSON actuators:
−
Type 3372 Electropneumatic Actuator
−
Type 3371 Pneumatic Actuator
−
Type 3374 Electric Actuator
−
Type 5824/5825 Electric Actuator
The seat (4) and plug with plug stem (5) are
assembled in the body (1). The plug stem is
connected to the actuator stem (A3/A7) by a
stem connector (A30/A31) and sealed by
the spring-loaded packing (15).
The process medium flows through the valve
in the direction indicated by the arrow in the
flow-to-open direction. The plug position de
-
termines the cross-sectional area between
the seat and plug.
The position of the plug is changed by the
control signal acting on the actuator.
Fig. 4:
Type 3321 Valve, DN 15
to 50/NPS ½ to 2;
mounting using a cross-
beam and central nut
(Form B)
A11
A3
8
4
1
15
14
17
5
A30
98
97
96
13
A17
A25
Summary of Contents for 3321
Page 11: ...EB 8111 8112 EN 11 Safety instructions and measures...
Page 27: ...EB 8111 8112 EN 27 Measures...
Page 33: ...EB 8111 8112 EN 33 Mounting and start up...
Page 35: ...EB 8111 8112 EN 35 Operation...
Page 45: ...EB 8111 8112 EN 45 Servicing...
Page 53: ...EB 8111 8112 EN 53...
Page 55: ...EB 8111 8112 EN 55 15 11 12 16 2 5 1 4 13 17 14 63 62 5 2 8 Type 3321 DN 65 to 100 NPS 2 to 4...