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2 Safety information
The safety information in this document refers only to an in-
dividual 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
responsible for the production of the risk analysis and for
compliance with the resulting precautionary measures and
regional safety regulations.
The document contains fundamental safety information that
must be observed during commissioning, operation and
maintenance. 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 specifica-
tions.
13. Maintain the product correctly.
14. Do not carry out any maintenance work and repairs not
described in this document without consulting the manu-
facturer first.
In cases of uncertainty:
15. Consult the nearest GEMÜ sales office.
www.gemu-group.com
3 Product description
3.1 Construction
4
3
2
1
Item
Name
1
Body
2
Disc
3
Spring
4
Spring cross
3.2 Description
The GEMÜ R90 is a metal disco check valve with flange con-
nection and standardized length to DIN EN 558. The valve
body, disc and seal are available in various materials. In the
version with metallic seal, the GEMÜ R90 valve can be used
at high temperatures up to 400 °C.
3.3 Function
The flow of fluid causes disc 2 in the check valve to open.
Check valves need a low opening pressure. The resulting
opening force moves the disc 2 against the spring 3 by over-
coming the the weight force of the disc 2 and the spring force
of the spring 3 so that the medium is released.
5 / 21
3 Product description
Materials
1.4408, CC333G, 1.0619, 1.4469
(super duplex)
1.4408, CC333G, 1.0619, 1.4469
(super duplex)
1.4571, C4 (Hastelloy)
1.4408, CC333G, 1.0619, 1.4469
(super duplex)
GEMÜ R90
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