Samson 3310, Монтаж и эксплуатация

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EB 8222-1 EN 3-1
Design and principle of operation
3 Design and principle of oper-
ation
The Type 3310 Valve is a segmented ball
valve. This valve is preferably to be com-
bined with:
− AIR TORQUE Type SRP or Type DAP
Pneumatic Rotary Actuator
or
− SAMSON Type 3278 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 PN 10 to 40/Class 150 and 300.
The segmented ball valve in valve sizes
NPS 1 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 flows 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 flow 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-acting Type SRP
and Type 3278 Pneu -
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 Type SRP 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 Type 3278 Pneumatic Rotary Ac-
tuator is used.
Legend for Fig. 3-1 and Fig. 3-2
1 Support shaft
2 Yoke
3 Bottom flange
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