[Kimura]
The parallel threaded seal joint with O-ring, which were the cause of air leakage in the valve drive of the GVmc and GVommt, were replaced with a regular tapered threaded seal joint.
After the replacement, a leakage test was conducted, and it was confirmed that there was no leakage.
Replacement with tapered thread seal joints is required for all KAGRA φ1000 gate valves, φ800 gate valves, and pendulum valves.
The following four gate valves are awaiting replacement.
1. GVitmx
2. GVetmx
3. GVitmy
4. GVetmy
The following 6 gate valves have been replaced with corrective parts.
1. GVmc
2. GVbsx
3. GVbsy
4. GVtmsx
5. GVtmsy
6 . GVommt