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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 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.
www.gemu-group.com
3 Product description
1
Item
Name
1
Plug
2
Coil
3
Valve body
Seal material
3.1 Function
Normally closed
*705
*702
*102
1
Fig. 1: Functional description (NC)
Normally closed
The pilot seat 2 is closed by the compression spring *705 in
the armature *702. The diaphragm *102 is pressed onto the
main valve seat 1 thanks to its design. The medium flows
through the control aperture 3 in the diaphragm into the con-
trol chamber above the diaphragm and increases the closing
force.
Switch position open
When voltage is applied, the armature *702 is pulled against
the pole surface of the bush. The medium pressure from the
control chamber to the valve outlet is reduced thanks to the
open pilot seat 2. More medium runs off from the control
chamber via the pilot seat than can pass through via the con-
5 / 20
3 Product description
2
3
Materials
PA
Duresco NU 463 V
/HNBR
GEMÜ 8257
2
3
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