Samson 3724 User Manual

EB 8048-2 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
The Type3349 Angle Valve is preferably
combined with a SAMSON Type3271 or
Type3277 Pneumatic Actuator (see Fig.3-1)
as well as the Type3379 Pneumatic Piston
Actuator (see Fig.3-2). The valve comes with
welding ends as standard. The valve is suit-
able for aseptic applications and is designed
without any cavities.
The process medium preferably ows
through the valve in the ow-to-open (FTO)
direction
1)
. The ow-to-close direction
(FTC)
2)
is possible. The process medium al-
ways ows through the micro-ow valve ver-
sion in the ow-to-close (FTC) direction. The
ow direction is indicated by an arrow on
the valve body. The position of the valve
plug determines the ow rate across the
cross-sectional area of ow released be-
tween the plug and lathed seat.
The plug stem is sealed by a full PTFE dia-
phragm that is USP ClassVI certied. A
packing can additionally be used in the mi-
cro-ow valve version.
The test connection allows the diaphragm to
be monitored for leakage. In the version with
backup packing, the test connection is sealed
by a stopper. The stopper must be replaced
with a suitable leakage indicator (e.g. a con-
tact pressure gauge, an outlet to an open
vessel or an inspection glass) when the valve
is installed. The test connection of valves
without a backup packing is tted with a
pipe elbow to allow the safe drainage of any
medium that escapes.
When combined with the Type3271 or
Type3277 Actuator, the actuator stem and
plug stem are connected using stem connec-
tor clamps (A26/27). When combined with
the Type3379 Actuator, the actuator stem
and plug stem are screwed together.
We recommend the use of positioners with
integrated diagnostic rmware (see sec-
tion3.4) for valves used for on/off service.
The partial stroke test included in this soft-
ware helps prevent a shut-off valve normally
in its end position from seizing up or getting
jammed.
Tip
1)
FTO: Flow-to-open (ow under the plug)
2)
FTC: Flow-to-close (ow over the plug)

Samson 3724 Specifications

General

Brand	Samson
Model	3724
Category	Valve Positioners
Language	English