SOMAS MTV - Installation and Disassembly of the Stuffing Box

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Edition: 2021-04 Original document - Mi-205 EN
6.3 Installation and disassembly of the stuffing box
1. Check the stuffing box after starting up and after this regularly. Retighten the nuts of the
stuffing box gland if necessary (
➔ Fig.6-4/1).
The stuffing box package must be replaced if leaks can no longer be
eliminated by tightening the nuts.
Changing the stuffing box is normally a part of valve overhaul. Follow applicable safety instructions
concerning dismounting of the butterfly valve from pipeline (
➔ Chap. 6.1) and dismounting the
pneumatic actuator from the ball segment valve (
➔ Chap. 5.4).
When indicated it is possible to change the stuffing box if the butterfly valve is installed
in the pipeline. For this regard the following safety instructions.
Warning!
Before replacing the stuffing box of a butterfly valve installed in the pipeline depressurise
the relevant butterfly valve in the pipeline system, isolate the butterfly valve and remove the
medium before working on the butterfly valve.
The pressurised medium may lead to injuries to personnel.
Warning!
Before carrying out maintenance or repair work on the butterfly valve with actuator or
installation and removal of the butterfly valve from the pipeline, always disconnect the
compressed air supply to the actuator.
Single action actuators may move to “open” or “closed” position without being connected to the
air system.