GEM 687 Manuale utente

GEMÜ 687 (MG 25, MG 40, MG 50)

Pneumatically operated diaphragm valve

Assembly instructions

Modifying from the old to the new versions of the distance piece and compressor us-

ing an assembly aid

Contents

1 General information ............................................. 3

1.1 Information .................................................... 3

1.2 Symbols used ................................................ 3

1.3 Warning notes ............................................... 3

2 Safety information ............................................... 4

3 Removing the distance piece ............................... 4

4 Fitting the distance piece ..................................... 5

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50)

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50)

1 General information

1.1 Information

- The descriptions and instructions apply to the standard ver-

sions. For special versions not described in this document

the basic information contained herein applies in combina-

tion with any additional special documentation.

- Correct installation, operation, maintenance and repair work

ensure faultless operation of the product.

- Should there be any doubts or misunderstandings, the Ger-

man version is the authoritative document.

- Contact us at the address on the last page for staff training

information.

1.2 Symbols used

The following symbols are used in this document:

Symbol Meaning

Tasks to be performed

Response(s) to tasks

– Lists

1.3 Warning notes

Wherever possible, warning notes are organised according to

the following scheme:

SIGNAL WORD

Type and source of the danger

Possible

symbol for the

specific

danger

Possible consequences of non-observance.

Measures for avoiding danger.

Warning notes are always marked with a signal word and

sometimes also with a symbol for the specific danger.

The following signal words and danger levels are used:

DANGER

Imminent danger!

▶Non-observance can cause death or

severe injury.

WARNING

Potentially dangerous situation!

▶Non-observance can cause death or

severe injury.

CAUTION

Potentially dangerous situation!

▶Non-observance can cause moderate

to light injury.

NOTICE

Potentially dangerous situation!

▶Non-observance can cause damage to

property.

1 General information

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50)

2 Safety information

The safety information in this document refers only to an indi-

vidual product. Potentially dangerous conditions can arise in

combination with other plant components, which need to be

considered on the basis of a risk analysis. The operator is re-

sponsible for the production of the risk analysis and for com-

pliance with the resulting precautionary measures and re-

gional safety regulations.

The document contains fundamental safety information that

must be observed during commissioning, operation and main-

tenance. Non-compliance with these instructions may cause:

- Personal hazard due to electrical, mechanical and chemical

effects.

- Hazard to nearby equipment.

- Failure of important functions.

- Hazard to the environment due to the leakage of dangerous

substances.

The safety information does not take into account:

- Unexpected incidents and events, which may occur during

installation, operation and maintenance.

- Local safety regulations which must be adhered to by the

operator and by any additional installation personnel.

Prior to commissioning:

1. Transport and store the product correctly.

2. Do not paint the bolts and plastic parts of the product.

3. Carry out installation and commissioning using trained

personnel.

4. Provide adequate training for installation and operating

personnel.

5. Ensure that the contents of the document have been fully

understood by the responsible personnel.

6. Define the areas of responsibility.

7. Observe the safety data sheets.

8. Observe the safety regulations for the media used.

During operation:

9. Keep this document available at the place of use.

10. Observe the safety information.

11. Operate the product in accordance with this document.

12. Operate the product in accordance with the specifications.

13. Maintain the product correctly.

14. Do not carry out any maintenance work and repairs not de-

scribed in this document without consulting the manufac-

turer first.

In cases of uncertainty:

15. Consult the nearest GEMÜ sales office.

3 Removing the distance piece

1. Remove the wing compressor (1).

2. Remove the four cylindrical screws (2) using a hexagon

wrench.

Diaphragm size (MG) Wrench size (WAF)

25 6

40 8

50 10

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50)

3. Remove the old distance piece (3).

4. Inspect actuator (4) for damage and leaks.

NOTICE

Important:

▶Clean all parts of contamination (do not damage the

parts during cleaning) following removal. Check parts for

potential damage; replace if necessary (only use genuine

parts from GEMÜ).

4 Fitting the distance piece

1. Position the new QHD distance piece (3) on the actuator

head (4).

Make sure the bolt holes are in the correct orientation.

The orientation of the leak detection hole varies depend-

ing on the installation position.

2. Assemble four cylindrical screws (2) with the integrated

washer (screw-and-washer assembly).

3. Screw in four cylindrical screws (2) but only loosely so

that the QHD distance piece can still move.

4 Fitting the distance piece

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50)

4 Fitting the distance piece

4. Use the assembly aid (5) to centre the QHD distance

piece.

Diaphragm size (MG) Assembly aid item number

25 99172246

40 99172247

50 99172248

5. Once the new QHD distance piece has been centred, the

four cylindrical screws must be screwed tight.

Diaphragm size (MG) Torque

25 18–20 Nm

40 21–23 Nm

50 25–28 Nm

6. Remove assembly aid (5).

7. Mount new QHD compressor (6).

Diaphragm size (MG) Mounting kit item number*

25 99172249

40 99172250

50 99172251

* The mounting kit comprises the QHD compressor (6), the

QHD distance piece (3) and the four cylindrical screws (2).

www.gemu-group.com 7 / 8 GEMÜ 687 (MG 25, MG 40, MG

50)

8. The actuator is now converted to the new QHD distance

piece with the latest internally guided compressor.

4 Fitting the distance piece

GEMÜ Gebr. Müller Apparatebau GmbH & Co. KG

Fritz-Müller-Straße 6-8, 74653 Ingelfingen-Criesbach, Germany

Phone +49 (0) 7940 1230 · [email protected]

www.gemu-group.com

Subject to alteration

12.2023 | 88893435

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