Bolted Seals

In stock


The MGS 9/1B is a very extensive range of bolted type seals, this design allows you to have a wide selection of diaphragm materials such as teflon, tantalum, hastelloy, 316 SST, monel and many more.

Being bolted means you can remove the lower process connection for cleaning or just check the diaphragm condition.

We at CPS stock some standard models with 316 SST diaphragm with teflon liner, but now you can order in anything you like for that special application. Even PVC and Polypropylene is available.

We offer a fit and filling service for those seals. These seals can be fitted to any of our range of pressure gauges especially the P4000 and P6000 series. We have even fitted one to a 200 bar XP2i. Having an extra large diaphragm these bolted seals are well suited for fitment to transmitter or gauges at very low pressure ie below 20 kPa. There is also a full range of these seals with different flanges and process connections.

Please click on the options available tab above to see the types we have in stock.
Product code: Nuova Fima


S450: 316 S/S body PTFE over Tantalum diaphragm 1/2 x 1/2, S451: 316 S/S body PTFE over S/S diaphragm 1/2 x 1/2, S500: 316 S/S body & diaphragm 1/2 x 1/2

Technical Information

The filling of diaphragm seals is not a difficult process but it can’t be rushed; basically the air is removed (by applying vacuum to the external of the gauge) from the inside of the bourdon tube of the gauge and replaced with a fill fluid eg Silicon Oil or cooking oil (in the case of CPS). The more air that is removed the better the fill will be. Because air is compressable any residual air will affect the accuracy of the gauge and reduce the life of the seal. Have too much air left behind and the thin stainless diaphragm in the seal will try and compensate for it and start to flex too far backwards and forwards as the pressure changes. The diaphragm will work harder and crack and fail and you will loose the fill fluid into your process. So it is important that your fill fluid is compatible with your process. So be aware of suppliers offering the filling of seals in a couple of hours. We evacuate our system overnight to ensure there is no residual air.

So if you have a special application that requires a special fill just contact us we are sure to help.


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