MKS Instruments UK Ltd
V2000-P Hardware Manual
– SP102006.103 March 2013
24
Fitting a new Orifice Disk
Ensure you have purchased the correct size orifice disk for your application, advice on the size and part number
can be sought via your local MKS office.
Keep the disk in its original packaging until needed.
Do not handle the Orifice Disk, use tweezers gently as not to deform or scratch the disk.
The orifice disk is marked with a black spot to indicate its fitting orientation. This dot should face towards the inlet
side of the flange.
Offer the new disk to the tapered hole in the inlet flange, this should be done with the Tool Guide removed, as
the disk needs to be offered as squarely as possible to the hole to avoid fouling.
Without disturbing the new Orifice Disk, carefully re-fit the tool guide to the inlet flange.
Once the guide is secured, check again that the new Orifice Disk is lying squarely in the tapered hole. If not, it
must be re-positioned.
Use the Insertion Tool to push the Orifice Disk into the tapered hole. Some resistance will be felt as the disk
seats into position. There should be a slight gap between the shoulders of the tool guide and the insertion tool.
Once the disk has been pushed fully home, remove the Insertion Tool and Tool Guide.
Inspect the orifice disk for correct seating, with no gaps visible around the disks edge.
Note:
The disk will be slightly cupped after correct fitting.
