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DOUBLE-SEAT VALVE (Type 491)
BA 049100.06 EN 29.06.2016
2 Safety
2.1 General Information
All persons involved with the installation, commissioning, operation and maintenance of
the double-seat valve must carefully read and observe the following instructions. Your
safety is at stake.
2.2 Proper Application
Double-seat valves are used in the food and beverage industry and the pharmaceutical
and chemical industry. They are used as single valves or in the valve group (valve knot).
Double-seat valves form the point of intersection between two separate piping systems
with different liquid media. Due to their function, they safely separate the liquid media
from each other or transfer the media from one piping system to the other.
2.3 Improper Application
Improper application occurs if:
• Liquid media different to that envisaged in the operating manual are conducted
through the valves.
• Operating conditions different to those envisaged in the operating manual apply.
• The safety instructions are disregarded in the operation, assembly and
maintenance.
• Independent modifications or changes to the double-seat valve are carried out that
restrict safety or functionality.
2.4 The User's Duty to Exercise Diligence
Both operator and user must ensure that only authorized and trained personnel work with
the double-seat valve.
The user must especially ensure that:
• The double-seat valve’s installation is carried out in accordance with the
instructions.
• The double-seat valves are used in accordance with their purpose and only in a
functional state.
• Only qualified and authorized personnel use and maintain the double-seat valves.
• The legal requirements of the operating safety regulations are adhered to.
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