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GEMÜ ZRSK
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.
3 Product description
3.1 Construction
1
6
3
5
7
3
2
4
Item
Name
Materials
1
Body
1.4408 investment casting,
1.0460 galvanised, 1.4571, alu
bronze (CC333G) 2.0975, 1.4469
super duplex
2
Disc
1.4408 investment casting,
1.0460 galvanised, 1.4571,
1.4469 super duplex
3
Seal (O-ring)
NBR, EPDM, FPM, PTFE
4
Spring
1.4571, Hastelloy
5
Screws
1.4571
6
Eye bolt
1.4571
7
Manual override
3.2 Description
GEMÜ ZRSK is a metal check valve with integrated flange
seal. The valve body, disc and seal are available in various
materials.
The GEMÜ ZRSK is clamped between two flanges during in-
stallation. The centring is based on the outside diameter of
the housing
3.3 Function
The flow of fluid causes disc
2
in the check valve to open.
Check valves therefore need a lower opening pressure. The
resulting opening force moves the check valve against spring
4
and the weight force of disc
2
so that the medium is re-
leased.
To potentially achieve higher flows, special flange adaptors
are provided which enable the valve to have a larger opening
angle. If the outlet pressure exceeds the inlet pressure, the
check valve closes and creates a seal against the medium us-
ing the O-ring. The valve is sealed off from the outside via the
O-ring. It is therefore recommended that flange sleeves with
smooth sealing surfaces be used.
3 Product description
