Samson 3331/BR 31a Manuale di servizio

Pneumatic Control Valve Type 3331/BR 31a

Special version Type 3331/3278

Type 3331 Butterfly Valve

Mounting and

Operating Instructions

EB 8227 EN

Edition July 2004

Fig. 1 · Type 3331/BR 31a (below) and Type 3331/3278 (top)

Contents Page

1 Design and principle of operation . . . . . . . . . . . . . . . . . . . 4

2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Assembling butterfly valve and rotary actuator. . . . . . . . . . . . . . 6

2.1.1 Type 3331-BR 31a, Type SRP . . . . . . . . . . . . . . . . . . . . . . 6

2.1.2 Type 3331/3278 . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Mounting position . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Test connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.4 Loading pressure connection . . . . . . . . . . . . . . . . . . . . . . 8

3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.1 Changing the fail-safe position . . . . . . . . . . . . . . . . . . . . . 8

4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 Packing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 Removing the butterfly valve. . . . . . . . . . . . . . . . . . . . . . . 9

5 Customer inquiries . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2EB 8227 EN

Contents

Note:

Non-electrical actuators and valves do not have their own potential ignition source accord-

ing to the risk assessment 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.

Refer to paragraph 6.3 of EN 60079-14:1977 VDE 0165 Part 1 concerning connection to

equipotential bonding system.

EB 8227 EN 3

Safety instructions

General safety instructions

The control valve may only be mounted, started up or serviced by fully

trained and qualified personnel, observing the accepted industry codes and

practices. Make sure employees or third persons are not exposed to any

danger. All safety instructions and warnings in these mounting and operat-

ing instructions, particularly those concerning assembly, start-up and main-

tenance, must be observed.

The control valves fulfill the requirements of the European Pressure Equip-

ment Directive 97/23/EC. Valves with a CE marking have a declaration of

conformity that includes information about the applied conformity assess-

ment procedure.

The corresponding declaration of conformity can be viewed and down-

loaded on the Internet at http://www.samson.de.

For appropriate operation, make sure that the control valve is only used in

areas where the operating pressure and temperatures do not exceed the op-

erating values which are based on the valve sizing data submitted in the or-

der. The manufacturer does not assume any responsibility for damage

caused by external forces or any other external influence! Any hazards

which could be caused in the control valve by the process medium, operat-

ing pressure, signal pressure or by moving parts are to be prevented by

means of the appropriate measures.

Proper shipping and appropriate storage of the control valve are assumed.

Caution!

For installation and maintenance work on the valve, make sure the relevant

section of the pipeline is depressurized and, depending on the process me-

dium, drained as well. If necessary, allow the control valve to cool down or

warm up to reach ambient temperature prior to starting any work on the

valve.

Prior to performing any work on the valve, make sure the supply air and

control signal are disconnected or blocked to prevent any hazards that

could be caused by moving parts.

1 Design and principle of opera-

tion

The pneumatic control valve consists of a

Type 3310 Butterfly Valve and either a

Pfeiffer Type BR 31a Pneumatic Actuator or

a SAMSON Type 3278 Pneumatic Actuator.

The control valve is primarily intended for

throttling or on-off service in the process en-

gineering industry and industrial applica-

tions.

It is suitable for liquids, vapors, and gases

with temperatures from −10 to +400 °C and

with nominal pressures from PN 10 to 40.

The butterfly valve in nominal sizes DN 100

to 400 can be designed depending on the

application with a swing-through or an-

gle-seated/low-noise butterfly disc. The ver-

sion used can be identified by a symbol on

the butterfly valve’s nameplate.

The process medium flows through the but-

terfly valve. The signal pressure acting on

the pneumatic actuator determines the posi-

tion (opening angle) of the butterfly disc (8)

and the flow rate across the free area be-

tween disc and body (1).

The shaft is sealed by a packing (5). The ac-

tuator motion is transmitted over a square-

ended shaft. In Type 3331/3278, a shaft

with feather key (4.1) is used to transmit the

motion from the actuator to the shaft.

Fail-safe positions:

The fail-safe position of the control valve

upon failure of the supply air is determined

by the version of Type 3331/BR 31a (sin-

gle-acting Type SRP) or depending on how

the rotary actuator is attached for

Type 3331/3278.

Valve CLOSED without supply air

The actuator springs close the valve when

the pressure is relieved from the rotary actu-

ator or when the supply air fails.

The valve is opened opposing the force of

the actuator springs as the signal pressure

increases.

Valve OPEN without supply air

The actuator springs open the valve when

the pressure is relieved from the rotary actu-

ator or when the supply air fails.

The valve is closed opposing the force of the

actuator springs as the signal pressure in-

creases.

4EB 8227 EN

Design and principle of operation

EB 8227 EN 5

Design and principle of operation

Fig. 2 · Sectional diagram of the butterfly valve

1 Valve body

2 Gland flange

3 Yoke

4 Shaft

4.2 Feather key

5 Packing

6 Spring

7 Tapered pins

8 Butterfly disc

9 Internal bearing

10 Plug

12 Type BR 31a

Actuator

12.1 Stop

12.2 Stop screw

13 Type 3278 Actuator

13.1 Stop screw

13.2 Stop screw

Pfeiffer Type BR 31a Actuator Type 3278 Actuator

Angle-seated/

low-noise disc

Swing-through

disc

2 Installation

2.1 Assembling butterfly valve

and rotary actuator

Note!

The butterfly valve may be used for throttling

or on-off service.

For on-off service, the opening angle must

be set to 90° (70° with angle-seated discs)

using the stop screws.

For throttling service, the opening angle

must be set to 70° using the stop screws.

2.1.1 Type 3331-BR 31a, Type SRP

If the valve and actuator have not been pre-

assembled by the manufacturer, proceed as

follows:

Note!

In the standard actuator version (SRP = sin-

gle acting with spring-return mechanism)

the springs turn clockwise.

Should the springs turn counterclockwise,

this must be specified on ordering the actua-

tor.

The rotary actuator can be mounted either

vertically or horizontally on the valve and

may be positioned at 90° around the valve

as required by the on-site conditions over a

square-end shaft.

Valve CLOSED without supply air

1. Place disc (8) in closed position (0° an-

gle of rotation).

2. Fasten yoke (3) with 2 or 4 screws de-

pending on the nominal size of the valve

to the flange of the shaft (4).

3. Place shaft adapter (if required) onto the

shaft. Slide actuator over adapter (or

shaft) and fasten to the yoke using four

screws.

4. Turn the stop screw (12.1 or 12.2, de-

pending on the direction of rotation) un-

til the valve is completely closed.

Align the markings on the shaft with the

markings on the gland flange.

5. Secure the position of the stop screw

with its lock nut.

6. Apply a signal pressure to match the

number of springs (see nameplate) to the

loading pressure connection.

7. Turn the other stop screw until the disc

reaches the opening angle of 90° or

70°.

8. Secure the position of the stop screw

with its lock nut.

Valve OPEN without supply air

1. Place disc (8) in open position (90° an-

gle of rotation).

2. Fasten yoke (3) with 2 or 4 screws de-

pending on the nominal size of the valve

to the flange of the shaft (4).

3. Place shaft adapter (if required) onto the

shaft. Slide actuator over adapter (or

shaft) and fasten to the yoke (3) using

four screws (3.1).

6EB 8227 EN

Installation

4. Turn the stop screw (12.1 or 12.2, de-

pending on the direction of rotation) un-

til the valve is completely open at 90°.

Align the markings on the shaft with the

markings on the gland flange.

5. Secure the position of the stop screw

with its lock nut.

6. Apply a signal pressure to match the

number of springs (see nameplate) to the

loading pressure connection.

7. Turn the other stop screw until the valve

is completely closed.

Align the markings on the shaft with the

markings on the gland flange.

8. Secure the position of the stop screw

with its lock nut.

2.1.2 Type 3331/3278

If the valve and actuator have not preassem-

bled by the manufacturer, the actuator is

mounted either to the flange 1or 2de-

pending on the fail-safe position.

The digit 1or 2is cast on the flange on the

corresponding side of the body.

The rotary actuator can be mounted either

vertically or horizontally on the valve and

may be positioned at 90° around the valve

as required by the on-site conditions over

four feather key grooves arranged in stages

of 90° around the actuator shaft.

Valve CLOSED without supply air

1. Undo both stop screws (13.1 and 13.2)

at the actuator. Rescrew stop screw

(13.2) to the point where the grooves of

the actuator shaft are positioned verti-

cally or horizontally to the actuator axis.

2. Place disc (8) in closed position (0°

angle of rotation).

3. Fasten yoke (3) with 2 or 4 screws de-

pending on the nominal size of the valve

to the flange of the shaft (4).

4. Slide actuator over shaft (4) and fasten

tight at yoke (3) using the four screws.

5. Undo stop screw (13.2) again.

6. Turn the stop screw (13.2) until the valve

is completely closed.

Align the markings on the shaft with the

markings on the gland flange.

7. Apply the signal pressure required for

the spring range (see nameplate) to

achieve the opening position.

8. Turn the stop screw (13.1) until the disc

(8) reaches the open position (90° or

70° angle of rotation).

9. Secure the position of both stop screws

with their lock nuts.

Valve OPEN without supply air

1. Undo both stop screws (13.1 and 13.2)

at the actuator. Rescrew stop screw

(13.1) to the point where the grooves of

the actuator shaft are positioned verti-

cally or horizontally to the actuator axis.

2. Place disc (8) in open position (90°

angle of rotation).

EB 8227 EN 7

Installation

3. Fasten yoke (3) with 2 or 4 screws de-

pending on the nominal size of the valve

to the flange of the shaft (4).

4. Slide actuator over shaft (4) and fasten

tight at yoke (3) using the four screws.

5. Undo stop screw (13.1) again.

6. Apply the signal pressure required for

the spring range (see nameplate) to

achieve the closed position.

7. Turn the stop screw (13.1) until the valve

is completely closed.

Align the markings on the shaft with the

markings on the gland flange.

8. Disconnect the signal pressure.

9. Turn the stop screw (13.2) until the disc

(8) reaches the open position (90° or

70° angle of rotation).

10.Secure the position of both stop screws

with their lock nuts.

2.2 Mounting position

The butterfly valve may be installed vertically

or horizontally in the pipeline. However, the

following points must be observed for the di-

rection of flow:

Mount the butterfly valve in the pipeline so

that the lower half of the disc opens towards

the direction of the flow. This helps prevent

any dirt deposits collecting which could pre-

vent the disc from opening.

Butterfly valves with angle-seated/low-noise

(streamlined) discs must be mounted without

exception with the direction of flow indi-

cated by the arrow on the valve body. On

mounting the valve between flanges in the

pipeline, place the disc in its closed position.

Take care not to damage the facings. On

tightening the flange bolts, make sure that

the flat gaskets are compressed evenly.

The butterfly disc must move without any re-

strictions when the valve is installed in the

pipeline.

2.3 Test connection

Butterfly valves with a test connection to

monitor the packing (recognizable by a

label and hexagonal screw plug), must be

equipped with a suitable leakage indicator

such as a contact pressure gauge, outlet into

an open receptacle or sight-glass.

2.4 Loading pressure connection

The loading pressure connection of small ro-

tary actuators is designed as a tapped G 1/8

hole and G 1/4 in large actuators.

Connection according to VDI/VDE 3845 al-

lows also the attachment of solenoid valves

(e.g. Type 3963) or a limit switch with or

without solenoid valve (e.g. Type 3776/

3777).

In conjunction with SAMSON positioners,

suitable accessories are available for connec-

tion.

8EB 8227 EN

Installation

3 Operation

3.1 Changing the fail-safe

position

The fail-safe position of the Type 3278

Actuator can be changed from “Valve

CLOSED without supply air” to “Valve

OPEN without supply” or vice versa. To pro-

ceed, mount the rotary actuator on the other

side. Refer to section 2.1.2.

The pistons of the Type BR 31a Actuator

(SRP) must be installed in the reverse direc-

tion in the actuator.

Note!

Refer to the Mounting and Operating In-

structions of the rotary actuator used for fur-

ther details such as changing the spring

range to achieve other actuator torques.

4 Maintenance

Note!

Before performing any maintenance

work on the control valve,

depressurize the concerned section

of the plant and drain the process

medium, if necessary.

Wait until the medium has cooled

down, if necessary.

We recommend removing the valve

from the pipeline.

Caution!

On performing any work on the

valve body, first shut off the supply

pressure, disconnect the supply pres-

sure line and remove the actuator.

4.1 Packing

Packing versions for use with temperature

ranges up to 220 °C are self-adjusting.

Packing suitable for higher temperatures up

to 450 °C can be adjusted. This packing

must be adjusted carefully on starting up the

plant by carefully tightening the gland

flange (2).

4.2 Removing the butterfly valve

Note!

On removing the butterfly valve from the

pipeline, make sure that the disc is in the

closed position.

EB 8227 EN 9

Operation

5 Customer inquiries

Please submit the following details:

4Order number

4Type designation, model number, nomi-

nal size and version of the valve

4Pressure and temperature of the process

medium

4Flow rate in m3/h

4Bench range (spring range) of the actua-

tor

4Installation drawing

Dimensions and weights

Refer to the Data Sheet T 8227 EN for the

dimensions and weights of the various valve

versions.

10 EB 8227 EN

Customer inquiries

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