Samson 3510-1, 3510-7 Mounting And Operating Instructions
Pneumatic Control Valve
Type 3510-1 and Type 3510-7
Type 3510-7 with 120 cm2 actuator
and integrated positioner
Fig. 1 ⋅ Pneumatic control valves
Type 3510-1 with 60 cm
Mounting and
Operating Instructions
EB 8091 EN
Edition July 2002
2
actuator
Type 3510-1 with 120 cm
2
actuator
Contents
Contents Page
1 Design and principle of operation . . . . . . . . . . . . . . . . . . . . . . 4
2 Assembling and adjusting valve and actuator . . . . . . . . . . . . . . . . 6
2.1 Signal pressure connection . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Assembly and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4 Operation – Reversing the operating direction . . . . . . . . . . . . . . . . 8
5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Replacing the stuffing box packing . . . . . . . . . . . . . . . . . . . . . . 10
5.2 Replacing seat and plug . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6 Customer inquiries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Note!
Non-electrical control valves which do not have a valve body lined with an insulating
material coating do not have their own potential ignition source according to the risk assess-
ment in the rare incident of an operating fault, corresponding to EN 13463-1: 2001 paragraph 5.2, and therefore do not fall within the scope of the European Directive 94/9/EC.
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EB 8091 EN
Safety instructions
The device may only be assembled, started up or operated by trained and ex-
perienced personnel familiar with the product.
According to these mounting and operating instructions, trained personnel is
referred to as individuals who are able to judge the work they are assigned to
and recognize possible dangers due to their specialized training, their knowledge and experience, as well as their knowledge of the applicable standards.
Any hazards which could be caused in the control valve by the process me-
dium, the operating pressure, the signal pressure or the moving parts are to
be prevented by means of the appropriate measures.
In addition, it is necessary to make sure that the control valve is only used in
areas where the operating pressure and temperatures do not exceed the operating values which are based on the valve sizing data submitted in the order.
Proper shipping and appropriate storage are assumed.
EB 8091 EN
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Design and principle of operation
1 Design and principle of operation
The pneumatic control valve consists of a
Type 3510 Micro-flow Valve (globe or
angle body style) and either a Type 3271-5
Pneumatic Actuator (Type 3510-1 Control
Valve) or a Type 3277-5 Pneumatic Actuator (Type 3510-7 Control Valve).
The modular design enables the actuators to
be exchanged, and the standard valve version to be enhanced to a version incorporating either a bellows seal or an insulating
section.
The process medium flows through the valve
in the direction indicated by the arrow. The
position of the valve plug (3) determines the
cross-sectional area of flow between the
valve seat (2) and the plug.
A change in the signal pressure acting on
the diaphragm of the actuator causes the
valve plug to move correspondingly. The
plug stem (6) is connected to the actuator
stem (8.1) via the stem connector (7) and
sealed with an adjustable stuffing box with
packing that contains PTFE sealing rings.
Fail-safe action:
Depending on the arrangement of the
springs (8.3) in the actuator, the control
valve has two different fail-safe actions:
Actuator stem
retracts
Type 3271-5 Actuator with 120 cm
Fig. 2 ⋅ Type 3271-5 Actuators
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EB 8091 EN
2
Actuator stem
extends
Type 3271-55 with 60 cm
Actuator stem
retracts
2
Actuator stem
extends
Design and principle of operation
Actuator stem extends:
When the signal pressure is reduced or in
case of a supply air failure, the springs
move the actuator stem downwards and
close the valve. The valve is opened against
the spring force, when the signal pressure
increases.
1Body
1.1 Screw
2Seat trim
2.1 Seat
2.2 Plug
2.3 Sealing ring
2.4 Anti-rotation device with
trim identification number
3Nuts
4Packing rings
4.1 Packing washer
5 Valve bonnet
5.1 Threaded bushing
5.2 Slotted round nut
6Yoke
6.1 Travel indicator scale
7 Stem connector
7.1 Stem connector nut
7.2 Stem connector sleeve
7.3 Lock nut
8Actuator
8.1 Actuator stem
8.2 Slotted round nut
8.3 Spring
8.4 Diaphragm
14 Connecting or switchover plate
14.1 Signal pressure route
"Actuator stem extends"
14.2 Signal pressure route
"Actuator stem retracts"
8.4
8.3
8
8.1
8.2
7.3
7.1
7
7.2
5.1
5.2
5
Actuator stem retracts:
When the signal pressure is reduced or in
case of a supply air failure, the springs
move the actuator stem upwards and open
the valve. The valve is closed against the
spring force, when the signal pressure increases.
14
14.1
14.2
6
6.1
3
4.1
4
1.1
2.4
2.3
2.2
2.1
1
2
Fig. 3 ⋅ Sectional drawing of micro-flow control valve with Type 3277-7 Actuator
EB 8091 EN
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