The compressed air ASCO valves for the M9BB, M20BB, T1 Profile Monitor (2x 8342C1 [rebuild kit 306-191] + 1x 8320G216 [rebuild kit 314-949] respectively), and T2 Profile Monitor (8320G216) were serviced with their rebuild kits.

To service these valves, we isolated them from the compressed air source by shutting off the outlet valves on the air amplifiers and venting the compressed air through the shared inlet lines (see photo).

When reinstalling the T2 profile monitor valve, there was some difficulty turning one of the Swagelok nuts. It would be a good idea to prepare spare tube fittings to replace any that no longer seal properly.

We can re-energize the air amplifier and check for leaks in the valve in the coming days (tube of soap solution brought to red toolbox on blocks)

The actuation of the T1 profile monitor and T2 beam blockers (M9 & M20) can be checked shortly after the air amplifiers are re-energized.

When the T2 target is returned to the station, we can check the actuation of the T2 profile monitor.

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UPDATE Feb 19:

The air amplifiers were re-started, supply valves to the T1 and T2 valves were re-opened, and the T1 profile monitor solenoid valve was tested by actuating the profile monitor.

The T1 profile monitor moved 'in' and 'out' successfully without timing out, but the control room operator noted that there was some odd status on EPICS for the T1 'harp' and that it did not correspond to the limit switch status for the profile monitors.

At T2, the M20 blocker solenoid valve does not hold pressure when supplied with air (toggle on cooling package panel turned on) and vented through the open port.

• Troubleshooting results:
  • M20 solenoid, when connected to the M9/T2 blocker solenoid electrical connector, 'opens' successfully and does not leak, causing the M20 blocker to go up.
  • M9 solenoid does not 'vent' when disconnected from the connector, successfully holds pressure in the 'rest' state.

We believe we made a mistake when re-assembling the M20 solenoid valve, this will have to be troubleshooted at a later date and possibly review the 'harp position' status on EPICS for the T1 profile monitor.