Samson 36-8 Manual de servicio

Safety Excess Pressure Valve (SEV)

Type 36-8

Edition April 2007

Mounting and

Operating Instructions

EB 2546-2 EN

Fig. 1 · Type 36-8 Excess Pressure Valve

1 Design and principle of

operation

The excess pressure valve consists of a

spring-loaded globe valve with a balanced

plug and an actuator with an operating dia-

phragm and a safety diaphragm.

The excess pressure valve is used to maintain

the pressure upstream of the valve to an ad-

justed set point value. The valve opens when

the upstream pressure rises.

The process medium flows through the valve

between the seat (2) and the plug (3) in the di-

rection indicated by the arrow. The position

of the valve plug determines the flow rate. The

upstream pressure p1is transmitted via the

control line (12) to the operating diaphragm

(11.1) and is converted into a positioning

force which is used to move the valve plug,

opposing the force of the positioning springs

(7). The spring force is adjustable at the set

point adjuster (6).

The regulator has two diaphragms (11.1) op-

erating independently from one another.

Continued operation is possible even should

one diaphragm fail. To recognize a ruptured

diaphragm, a diaphragm rupture indicator

or optionally a pressure switch to signalize a

rupture is installed in the intermediate ring

(11.3 ).

Typetestng:

The regulator has been typetested as a safety

excess pressure valve (SEV) by the German

Technical Inspectorate (TÜV) according to

AGFW specifications.

The test mark is available on request.

2EB 2546-2 EN

Design and principle of operation

The regulators must be mounted, started up and serviced by fully trained

and qualified personnel only, 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 instructions, particularly those

concerning installation, start-up, and maintenance, must be observed.

Any hazards which could be caused in the excess pressure valve by the

process medium or operating pressure are to be prevented by means of

appropriate measures.

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

applications where the operating pressure and temperatures do not

exceed the operating values based on the valve sizing data submitted in

the order.

Proper shipping and appropriate storage are assumed.

EB 2546-2 EN 3

Design and principle of operation

11.1

11.3

11.2

1 Valve body

2 Seat

3 Plug

4 Plug stem

5 Balancing bellows

6 Set point adjuster

7 Positioning springs

8 Bellows

9 Fastening nut

10 Support

11 Actuator housing

11.1 Diaphragms

11.2 Diaphragm rupture

indicator

11.3 Intermediate ring

12 Control line

Drawn turned

by 90° into the

plane of projection

Fig. 2 · Sectional drawing

2 Installation

2.1 Position of installation

Note!

Flush the pipeline thoroughly prior to installa-

tion of the regulator, ensuring that sealing

particles and other impurities carried along

by the process medium do not impair proper

operation, especially tight shut-off.

Install the excess pressure valve in horizontal

pipelines with the actuator suspended down-

wards.

On installing the valve, check that the medium

flows in the same direction as indicated by the

arrow on the valve body.

On choosing the point of installation, it is im-

portant to make sure that the regulator can

still be easily accessed after completion of the

plant.

The regulator must be installed free of stress. If

necessary, support the piping near the con-

necting flanges.

Note!

Never attach supports to the valve or actua-

tor.

2.2 Shut-off valve, pressure

gauge

Ideally hand-operated shut-off valves should

be installed both upstream and downstream

of the regulator. This allows the plant to be

shut down for cleaning and maintenance rou-

tines, or when the plant is not operated for

long periods of time.

To monitor the pressures in the plant, pressure

gauges should be installed upstream and

downstream of the regulator.

4EB 2546-2 EN

Installation

Fig. 3 · Installation example

12 451

1 Shut-off valve

2 Upstream pressure gauge

3 Strainer

4 Pressure reducing valve

5 Downstream pressure gauge

3 Operation

3.1 Start up

Open the hand-operated shut-off valve

downstream of the excess pressure valve.

Then open slowly the shut-off valve upstream

of the excess pressure valve.

3.2 Set point adjustment

The excess pressure required (upstream pres-

sure p1) is set by turning the set point adjust-

ment (6) with an open-end wrench, up to

DN 50 with flats across width SW 19 and

from DN 65 upwards with SW 22.

Turning it clockwise increases the upstream

pressure and turning it counterclockwise re-

duces it.

The pressure gauge located on the upstream

pressure side allows the adjusted set point to

be monitored.

4 Troubleshooting

Should the excess pressure (pressure gauge

located on the upstream pressure side) devi-

ate significantly from the adjusted set point

value, check first the control line (12) for any

blockages (section 4.1).

If the diaphragms are damaged, the actuator

can be disassembled and the diaphragms

(11.1) can be replaced (section 4.2).

If other causes such as a damaged seat or

plug are found, we recommend that you con-

tact our customer service center or return the

regulator to the manufacturer for repair.

Caution!

If the repair is to be performed by the plant

operator, it is important to take into account

when assembling and disassembling the reg-

ulator that the valve springs (7) for valve nom-

inal sizes DN 15 to 50 are preloaded by up to

70 mm.

To remove the springs, only use a suitable

tool, for example, SAMSON disassembly tool

9129-2747.

Additionally it is important to make sure that

no torque is transmitted to the bellows (8),

otherwise the metal bellows will be irrepara-

bly damaged.

Remove the regulator from the pipeline be-

fore performing any repair work on it!

5EB 2546-2 EN

Operation

Prior to disassembling the excess

pressure valve, shut down the plant

by slowly closing the shut-off valves.

Relieve the corresponding part of the

plant from pressure and drain it, if

necessary.

4.1 Cleaning the control line

1. Loosen the screw joints connecting the

control line to the actuator and the valve

body, and remove the control line.

2. Blow through the control line to remove

any blockages and clean it. Reattach it to

the actuator and the valve body.

4.2 Replacing the diaphragms

Note!

When the bottom diaphragm fails, the atmo-

spheric pressure in the intermediate chamber

between the diaphragms rises to the level of

the upstream pressure. A red mark becomes

visible in the mechanical rupture indicator.

For versions with an installed pressure switch,

a visual or acoustic signal is triggered.

When the rupture indicator is activated, the

bottom diaphragm must be replaced.

1. Unscrew the control line and clean.

2. Unscrew the nuts (9) on the support (10)

and remove the actuator housing (11).

3. Disassemble the actuator housing and re-

place the diaphragm(s).

To reassemble the regulator, proceed in the

reverse order. To start up, proceed as de-

scribed in section 3.1.

EB 2546-2 EN 6

Troubleshooting

Nominal size, set point range and spare parts for actuator

5 Dimensions and weights

EB 2546-2 EN 7

Dimensions and weights

Set point

range

bar

Nominal valve size DN Actuator

DN 15...25 DN 32...50 DN 65...100

Sur-

face

cm²

Diaphragm material

EPDM FKM

Act-

uator Diaph

gram Act-

uator Diaph

gram

Required spring(s)

Order no. 0270-

Order no.

1070- 0520- 1070- 0520-

2 to 4.4 2166 2167 2166 2167 1410 2203

80 9500 0868 9508 0869

2.4 to 6.6 2166 2168 2166 2199 1410 1417

6 to 11 2200 2201 2200 2201 1416 2204

Nominal size

DN 15 20 25 32 40 50 65 80 100

Length L 130 150 160 180 200 230 290 310 350

Height H 415 470 600 615

Weight 1)

approx. kg 13 14 14.5 20 22 22.5 41.5 48.5 57.5

1) Weights for PN 16,

+10 % for spheroidal graphite iron PN 25 and cast steel PN 40

ØD 30

6 Customer inquiries

Please submit the following details: (see also

name plate)

4Type and nominal size

4Order number and model number

4Upstream and downstream pressure

4Flow rate in m³/h

4Has a strainer been installed?

4Installation drawing

SAMSON AG · MESS- UND REGELTECHNIK

Weismüllerstraße 3 · 60314 Frankfurt am Main · Germany

Phone: +49 69 4009-0 · Fax: +49 69 4009-1507

Internet: http://www.samson.de EB 2546-2 EN

S/Z 2007-04

Conversion from chromate coating to iridescent passivation

We at SAMSON are converting the surface treatment of passivated steel parts in our

production. As a result, you may receive a device assembled from parts that have be-

en subjected to different surface treatment methods. This means that the surfaces of so-

me parts show different reections. Parts can have an iridescent yellow or silver color.

This has no effect on corrosion protection.

For further information, go to u www.samson.de/chrome-en.html



Conversion from chromate coating to

iridescent passivation

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