G08
Safety in an ATEX zone:
- The maintenance personnel must be made fully aware of the risks of explosion, and it is
advisable that they receive specific training regarding ATEX.
- Should the fluid transported create an internal explosive atmosphere, the user must check
periodically the correct water-tightness of the installation
- Clean the valve periodically to prevent dust accumulation.
- Assembly at the end of the line is not allowed.
- Avoid repainting the products supplied.
The only maintenance required is to change the packing seal (4) and the two rubber sleeves (3) as well
as the use of the grease nipples (7) for regular lubrication.
The life of these elements will depend on the working conditions of the valve such as: pressure,
temperature, abrasion, chemical action, number of operations, etc.
To allow optimal operation, the lower part of the valve, accessible through the splashguard (8) should
be cleaned regularly.
If the gate is brushed and cleaned regularly, the wear of the sleeves (3) can be minimised.
4.1. - Replacement of the packing seal (4):
If one or both sleeves (3) have failed, the slurry may injure personnel during this replacement.
Then, the valve should be removed from the pipeline before starting the following steps.
1) Place the valve in close position and insert the open-closed lockout (if the valve has it).
2) Remove the gate guards (for automatically actuated valves only).
3) Release the spindle or stem (9) from the gate (2).
4) Loosen the screws of the yoke (6), extract the open-closed lockout (if the valve has it) and
remove the yoke (without loosing the actuator).
5) Loosen the bolts of the gland follower (5) and remove it.
6) Remove the gate (2) and the old packing seal (4) and clean the stuffing box.
7) Insert the new packing seal (4) lubricated (put silicone-based grease inside of the seal).
Radiused edges go in first.
8) Insert the gate (2) and tighten the gland follower (5).
9) Place the yoke (6) (with the actuator) and screw it.
10) Fix the stem (9) to the gate (2).
11) Remount the gate guards.
12) Carry out some operations with a loaded circuit.
4.2.- Replacement of the sealing sleeves (3):
1) Remove the valve from the pipeline.
2) Remove the sealing sleeves (3).
3) Set the gate (2) in the open position.
4) Clean within the bodies (1), filling the inner part of the body with silicone based grease.
5) Lubricate the new sleeves (3) with the same grease and install them.
6) Remount the valve in the pipeline.
7) Tighten the flanges.
8) Operate the valve a couple of times before leaving it in the position required for the process.
4.3. - Lubrication:
The VG valve must be lubricated and inspected at least once every 2000 operations, using a
silicone based grease for the sleeves.
Twice a year, it is recommended to fill up the stem protector (11) halfway with a calcium-based
grease with the following characteristics: highly water resistant, low ash content, and excellent
adherence.
