Samson 3510-1 Service manual

Pneumatic Control Valve
Type 3510-1 and Type 3510-7
Mounting and
Operating Instructions
EB 8091 EN
Edition July 2002
Fig. 1 ⋅Pneumatic control valves
Type 3510-7 with 120 cm2actuator
and integrated positioner
Type 3510-1 with 60 cm2actuator
Type 3510-1 with 120 cm2actuator

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
Contents
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 para-
graph 5.2, and therefore do not fall within the scope of the European Directive 94/9/EC.
2EB 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 knowl-
edge 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 oper-
ating values which are based on the valve sizing data submitted in the order.
Proper shipping and appropriate storage are assumed.
EB 8091 EN 3

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 Actua-
tor (Type 3510-7 Control Valve).
The modular design enables the actuators to
be exchanged, and the standard valve ver-
sion to be enhanced to a version incorpora-
ting 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:
Fig. 2 ⋅Type 3271-5 Actuators
Actuator stem
extends
Actuator stem
retracts
Type 3271-5 Actuator with 120 cm2
Actuator stem
retracts
Actuator stem
extends
Type 3271-55 with 60 cm2
4EB 8091 EN
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.
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 in-
creases.
Fig. 3 ⋅Sectional drawing of micro-flow control valve with Type 3277-7 Actuator
8.4
8.3
8
8.1
8.2
7.3
7.1
7.2
5.1
5.2
5
7
14
14.1
14.2
6
6.1
3
4.1
4
1.1
2.4
2.3 2
2.2
2.1
1
1Body
1.1 Screw
2Seattrim
2.1 Seat
2.2 Plug
2.3 Sealing ring
2.4 Anti-rotation device with
trim identification number
3Nuts
4Packingrings
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"
EB 8091 EN 5
Design and principle of operation

2 Assembling and adjusting valve
and actuator
If control valve and actuator have not been
pre-assembled by the manufacturer, ob-
serve the different signal pressure connec-
tions of the actuators on assembly.
2.1 Signal pressure connection
Type 3510-1 Control Valve
with Type 3271-5 Actuator
The signal pressure connection for fail-
safe action "Actuator stem extends" is lo-
cated at the bottom of the diaphragm
case. For "Actuator stem retracts", the
connection is to be found at the top of
the diaphragm case.
Type 3510-7 Control Valve
with Type 3277-5 Actuator
Actuator with positioner:
The signal pressure is transferred to the dia-
phragm case via bores at the left and right
side of the yoke and via a switchover plate
(accessories). The fail-safe action "Actuator
stem extends" or "Actuator stem retracts"
determines how the switchover plate needs
to be aligned to the mark.
Turn the switchover plate, so that the ap-
propriate symbol for the fail-safe action
is aligned to the mark.
Whether the actuator is attached to the
left or right depends on the operating di-
rection (>>) or (<>) of the positioner.
Actuator without positioner:
Instead of a switchover plate, a connecting
plate (accessories) is required if the actua-
tor is used without positioner
Here, the signal pressure is transferred to
the diaphragm case directly via the signal
pressure connection of the connecting plate.
Turn the connecting plate, so that the ap-
propriate symbol for the fail-safe action
"Actuator stem extends" or "Actuator
stem retracts" is aligned to the mark.
Make absolutely sure that the gasket of
the connecting plate is inserted correctly.
The connecting plate provides bores for
NPT and G threads. Seal the unused con-
nection with a rubber gasket and a
square plug.
Accessories:
Switchover plate and connecting plate need
to be ordered as accessories.
Note that actuators with device modification
index 01, e.g. 3277-531xxx20.01 (old =
.00) must be equipped with new plates.
Old and new plates are not interchange-
able.
Switchover plate new Order no. 1400-6822
old Order no. 1400-6819
Connecting platenew Order no. 1400-6823
old G thread Order no. 1400-6820
old NPT thread Order no. 1400-6821
6EB 8091 EN
Assembling and adjusting valve and actuator

Note!
When used in connection with the micro-
flow valve, the pneumatic actuators with fail-
safe action "Actuator stem retracts" are
limited to the max. permissible supply press-
ures [bar] listed in the table.
For actuators with fail-safe action "Actuator
stem extends", the max. supply pressure is
limited to 4 bar.
Valves with positioners are to be adjusted
to these max. perm. supply pressures.
Signal pressure
range
Adjusted to Max. perm.
pressure
0.2 to 1 0.4 to 0.8 2.5
0.4 to 2.0 0.8 to 1.6 3.3
1.4 to 2.3 1.7 to 2.1 3.8
2.1 to 3.3 2.4 to 3.0 4.7
2.2 Assembly and adjustment
For actuators with a switchover plate for at-
tachment of a positioner, a suitable adapter
needs to be connected to the bores at the
side. Alternatively, the connecting plate
(Fig. 4, right) can be used.
1. On the actuator stem, loosely screw
both stem connector nut (7.1) and lock
nut (7.3) all the way up (Fig. 3).
2. Slide slotted round nut (8.2 ) over both
coupling nut and lock nut.
3. Place the actuator on the yoke (7) and
fasten with slotted round nut (8.2). For
fail-safe action "Actuator stem ex-
tends", apply approx. 50 % of the sig-
nal pressure range (see nameplate) to
the signal pressure connection of the ac-
tuator using a pressure regulator, caus-
Fig. 4 ⋅Signal pressure connections
Actuator stem extends
Left Attachment Right
Actuator stem
extends retracts
Switchover plate Connecting plate
Signal pressure
Signal
pressure Symbol
Mark
Signal
pressure
Actuator stem retracts
Left Attachment Right
EB 8091 EN 7
Assembling and adjusting valve and actuator

ing the actuator stem to retract far
enough to screw together stem connec-
tor nut (7.1) and stem connector sleeve
(7.2).
4. Screw together stem connector sleeve
(7.2) and stem connector nut (7.1) as
tightly as possible.
5. Apply lower range value of the signal
pressure range to the signal pressure
connection.
For a signal pressure range (bench
range) of, for example, 0.4 to 0.8 bar
and an actuator with fail-safe action
"Actuator stem extends", the lower sig-
nal pressure range value is 0.4 bar; for
"Actuator stem retracts" it is 0.8 bar.
6. Rotate stem connector (7) on actuator
stem until plug stem moves from the
closed position at the corresponding in-
itial value. To do so, change signal
pressure each time using the pressure
regulator, and return to the initial lower
range value.
7. Fasten lock nut (7.3) to secure the stem
connector.
8. Align travel indicator scale (6.1) to the
black ring on the stem connector.
3Installation
3.1 Mounting position
Any desired mounting position is possible.
Note! Make sure the valve is installed free
of stress. If necessary, support the pipes
near the connections.
Flush pipes thoroughly before installing the
valve.
For valve versions with bellows seal or insu-
lating section, which are installed in pipes
to be insulated, do not insulate the bellows
intermediate piece or insulating section (9).
Test connection
The version with metal bellows seal can be
equipped with a test connection (16) with
G 1/8 thread at the bellows seal. This con-
nection is used to check the tightness of the
bellows.
It is recommended to install a suitable leak-
age indicator, in particular when explosive
and hazardous media are used.
4 Operation - Reversing the opera-
ting direction
If it becomes necessary to reverse the fail-
safe action of the actuator from "Actuator
stem extends" to "Actuator stem retracts" or
vice versa, refer to the mounting and opera-
ting instructions of the actuator for details.
EB 8310 EN for Type 3271-5,
EB 8311 EN for Type 3277-5.
8EB 8091 EN
Installation

5 Troubleshooting
If the valve leaks, the packing may be defec-
tive or, in the bellows version, the metal bel-
lows may be defective.
Tight shut-off of the valve can also be im-
paired by impurities or other foreign par-
ticles between seat and plug, or by dam-
aged seat joints.
Remove the affected components, clean
them thoroughly and, if necessary, replace
them.
Caution!
Make sure to relieve the pressure
from the pressurized part of the
plant and, depending on the me-
dium, drain it completely before per-
forming maintenance. For high tem-
peratures, allow the plant to cool
down to ambient temperature.
Disconnect and lshut off the supply
air as well as the control signals to
prevent against danger posed by
moving parts at the valve.
As valves are not free of dead ca-
vities, remember that there might still
be residual media in the valve. This
particularly applies for valve version
with bellows seal or insulating sec-
tion.
It is recommended to remove the
valve from the pipeline for mainten-
ance.
Note!
The seat and special tools required for in-
stallation as well as the appropriate tighte-
ning torques are to be found in the SAM-
SON Special tools brochure WA 029.
A complete tool kit for the Type 3510
Micro-flow Valve can be ordered separately
(order no. 1280-3050).
EB 8091 EN 9
Troubleshooting

5.1 Replacing the stuffing box
packing
If leakage occurs at the stuffing box, the
stuffing box packing must be replaced as
described below.
1. For actuators with "Actuator stem ex-
tends", apply approx. 50 % of the sig-
nal pressure range (see nameplate) to
the actuator, causing the actuator stem
to retract.
Place socket wrench (width across flats
(SW) 17) on stem connector nut (7.1)
and unscrew stem connector sleeve
(7.2) with a second SW 17 wrench.
2. Unscrew the bottom slotted round nut
(5.2). Remove actuator (8) including
yoke (6) from the valve, turning the
slotted round nut (5.2), so that a groove
points towards the travel indicator scale
(6.1).
3. Take out the nuts (3). Remove stem con-
nector sleeve (7.2) from the plug stem.
4. Remove the screw (1.1) and the anti-ro-
tation device (2.4). Unscrew the valve
bonnet (5) from the valve body.
5. Unscrew threaded bushing (5.1). Pull
the plug stem, together with the plug
(2.2), out of the valve bonnet (5).
For versions with bellows intermediate
piece or insulating section, separate
valve bonnet and bellows intermediate
piece/insulating section (9). The plug
stem extension (10.1, Fig. 6) remains
fixed in the extension bonnet.
6. Remove packing washers (4.1) and
packing rings (4) from the packing
chamber using a suitable tool. Make
sure not to damage the sealing edges.
Clean packing chamber thoroughly.
Assembly:
7. Insert new sealing rings. Start with a
white ring, followed by two black rings
and another white one. Make sure that
the butt joints of successive rings are
not positioned on top of each other.
8. Insert packing washer(s) (4.1). Tighten
threaded bushing (5.1) manually.
9. Slide plug stem with plug (2.2) into the
valve bonnet as far as it will go. Tighten
threaded bushing (5.1), observing a
minimum gap of 1.3 mm between valve
bonnet and threaded bushing. If this is
not the case, add required number of
packing washers (4.1) (min. 1, max. 3
washers).
10. Insert new sealing ring (2.3) into the
body. Screw together valve bonnet and
body.
11. Place anti-rotation device (2.4) on the
valve bonnet and tighten it, so that the
fastening screw (1.1) is seated in the ob-
long hole.
12. Push stem connector sleeve (7.2) onto
the plug stem with the thread facing up-
wards. Screw on nuts (3).
Lock nuts against each other, so that ap-
prox. 1 mm of the thread is still visible.
13. Place actuator including yoke onto
valve bonnet. Tighten with slotted round
nut (5.2).
For actuators with "Actuator stem ex-
tends", apply approx. 50 % of the sig-
nal pressure range (see nameplate) to
the actuator using a pressure regulator,
causing the actuator stem to retract far
10 EB 8091 EN
Troubleshooting