Operating Manual
Double Seal Valve
75100 / 75200
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2011-05-31
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6. Inspection and Maintenance
6.1 General Information
Risk of injuries!
Safety instructions and warning notices – see Chap. 2.2 / 5.1
Caution – functional impairment or material damage!
Inspection and maintenance intervals:
Visual and acoustic inspections must be carried out every 4 weeks.
>> Check electrical and pneumatic supplies, switching function, leaks
To ensure that the valve is ready for operation and functionally reliable, it should
be checked every year within the scope of the general internal maintenance
procedure.
If protection devices were attached for maintenance or supply and exhaust lines to
the valve blocked, the protection devices / line blockings must be disassembled.
Ensure that a function test is always performed on the valve following
maintenance work.
Function check:
The valve must be subjected to a function test prior to installation and after maintenance work. Firstly, the valve
is positioned vertically and secured against toppling. It is then subjected to compressed air (6 bar). Correct
function is recognised by a continuous OPEN-CLOSE movement of the valve rod.
Maintenance intervals
The maintenance intervals are geared to the operating conditions, such as switching frequency, kind of media,
process temperature, temperature change, process pressure, etc. For this reason the maintenance intervals
should be determined by the user.
It is recommended, however, that the seals always be checked every 6 months if they are operated at high
switching frequencies and high media temperatures. A full inspection should be carried out every 12 months.