OPERATING MANUAL
06-2021
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6.
OPERATION AND MAINTENANCE
The gate valve shall be operated in accordance with all relevant requirements for stop valves, i.e. kept either in the
fully open or fully closed position. Leaving the gate valve partially opened (or closed) may result in seal failure.
The gate valve can be controlled with an electric drive unit.
Valve control requires a specific driving torque (see table in Section 2) and a specific number of spindle turns. Do
not exceed the maximum driving torque.
To ensure full operational efficiency, carry out a technical inspection and maintenance at least once a year as
follows:
Operate the gate valve from the fully open position to the fully closed position, or vice versa, as the case may
be.
Follow the driving torque limits specified in the table in Section 2.
If the valve operation is difficult, i.e. the valve reaches the maximum driving torque before either of its limit
positions (e.g. due to scale on the spindle threads), repeat the full operation three times.
Check the tightness of all connections and seals with the gate valve closed.
If all the actions above have been completed with a good result, visually inspect the corrosion protection. If
the paint coat is damaged, rebuild it with the paint kits available from JAFAR.
Replacing the seal in the cover:
Fully open the valve (until you clearly sense that the wedge closure (6) resists further movement; this will seal the
spindle under the flange (5)).
This operation allows you to replace the o-rings in the plug (2) or the whole plug assembly on the pipeline.
Clean the gate valve cover from dirt, sediments and grime.
Disassemble the following in the succession shown below:
the circlip (1).
Release and remove
the sealing plug (2) (with the service wrench tool available from the manufacturer).
1
2
3
4
5
6
