wT 1207/11
Page 7
Recommended preventative maintenance to obtain the best possible service
life from KLINGER VALVES
As with all spindle-operated mechanisms,
regular lubrication with Metaflux Lubricating Metal Paste
70-85
increases the life of the spindle (Pos8). In addition, the coupling moment will be decreased when
the spindle is well lubricated.
At temperatures above 50°C the spindle must be lubricated at least once a month or after 500
operations.
Especially the split screwed connection should be lubricated.
Hazardous Operating Errors and Possible Sources of Danger
Where the process fluid is incompressible, the operating of piston valves can cause pressure changes
in tightly sealed parts of the system. This should be taken into account especially during the planning
stage and can be avoided by selecting suitable installation positions (see Fig. 1).
Piston valves provide a particularly good seal. During temperature changes, process fluid captured
between two piston valves can cause considerable changes in pressure which may exceed the
pressure category of the valve. In such cases, appropriate volume compensation (expansion tank) is
necessary.
Always ensure that the correct tightening torque specified in the Technical Data Sheet on Page 12 is
applied to the bonnet hexagon nuts.
Do not loosen or undo these nuts while the valves are under pressure.
The valves must not be subjected to pressure shocks in excess of one and a half times their rated
pressure.
When the stem thread becomes so worn that its stability seems endangered, release the pressure on
the valve and carry out the necessary maintenance.
Valves made of cast iron are particularly susceptible to brittle fracture and impact damage. This should
be borne in mind when choosing materials.
Whatever the application, always consult the operating limits diagram (pressure-temperature) and also
consider the suitability of the materials for various process fluids.
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