EB 8222-1 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
The Type3310 Valve is a segmented ball
valve. This valve is preferably to be com-
bined with:
− AIRTORQUE TypeSRP or TypeDAP
Pneumatic Rotary Actuator
or
− SAMSON Type3278 Pneumatic Rotary
Actuator
or
− Electric actuator.
The control valve is designed for both throt-
tling and on/off service. The control valve is
suitable for liquids, vapors and gases at tem-
peratures from –40 to +450°C and pressure
rating of PN10 to 40/Class150 and 300.
The segmented ball valve in valve sizes
NPS1 to 12 is available with a soft-seated
or metal-seated ball. The version used is
marked on the nameplate of the valve body
(see the 'Markings on the device' section).
The process medium ows through the valve.
The signal pressure applied to the rotary ac-
tuator determines the position (opening an-
gle) of the segmented ball (7) and thus the
cross-sectional area of ow between the ball
and body (5). The actuator motion is trans-
mitted to the segmented ball valve by the
valve shaft (12) with square or key drive. The
valve shaft (12) is sealed by a packing (40).
3.1 Fail-safe action
3.1.1 Single-actingTypeSRP
andType3278Pneu-
matic Rotary Actuators
The fail-safe position of the valve upon sup-
ply air (signal pressure) failure is determined
by the version of the single-acting AIR
TORQUE TypeSRP Pneumatic Rotary Actua-
tor.
The fail-safe position of the valve upon sup-
ply air (signal pressure) failure is determined
by how the actuator is mounted when a
SAMSON Type3278 Pneumatic Rotary Ac-
tuator is used.
LegendforFig.3-1andFig.3-2
1 Support shaft
2 Yoke
3 Bottom ange
4 Insulating section
5 Valve body
7 Segmented ball
10 Spring
12 Valve shaft
15 Packing gland
17 Bearing bushing
18 Bearing bushing
30 Retainer
35 Bushing
40 V-ring packing
46 Gasket
49 Spacer
70 Retaining screw
80 Washer
88 O-ring seal
90 Gasket
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