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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 dan-
gerous materials.
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 person-
nel.
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.
www.gemu-group.com
3 Product description
3.1 Construction
5
3
4
Item
Name
1
Ball
2
Pipe connections
3
Seal material
4
Ball valve body
5
Body seal material PTFE, for fire-safe option PTFE
Pressure-relief
hole
Control ball only for body configuration – full bore (code V)
Control ball
Code U
NOTE: The control ball cannot be retrofitted to standard 2/2-
way bodies at a later date.
3.2 Description
The GEMÜ 798 3-piece 2/2-way metal ball valve is motorized.
It has a plastic actuator housing. A manual override and an
optical position indicator are integrated as standard. The seat
seal is made of PTFE. Due to a graphite reinforced body seal,
the GEMÜ 798 ball valve is optionally also available as
FireSafe version.
5 / 51
3 Product description
1
2
Materials
DN 8–15: SS316
DN 20–100: CF8M
1.4408, investment casting material
PTFE
1.4408, investment casting material
carbon-filled
Code V
30°
60°
Code W
90°
GEMÜ 798
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