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By Björn Bofinger I Posted: March 2018
To keep the environment clean
Flush rings help to properly dispose of residual gas and liquid during maintenance and repair of measuring arrangements. In addition, they are suitable for avoiding blockages in the process connection piece. They are used, for example, in the chemical industry. Here strict requirements apply to the process plants: Safety and environmental protection must be guaranteed at all times, because not all processed substances are harmless to humans and nature. This also means that gases or liquids must not escape from the systems - neither during operation nor during maintenance. Flush rings are important helpers here.
Where are flush rings used?
For optimum process monitoring, the plants are often equipped with measuring devices that record parameters such as pressure, differential pressure and level. They are connected to the system via a separate impulse line. If a technician needs to check, calibrate, or repair a measuring device, he unscrews it from the impulse line. In order to prevent leakage at the measuring point in such a case, all measuring devices have an initial shut-off with a shut-off valve or ball valve. This valve closes the transition between the process and the impulse line and thus prevents the medium from escaping.

Often it happens that after closing the initial shut-off a remainder of the pressurized medium in the line section between shut-off valve and measuring device remains. To meet the legal requirements, this remainder must be collected and disposed of properly. The flush ring is used for this purpose. This is fitted with a flanged connection between the shut-off valve and the measuring device.
What is the function of flush rings?
On the outside of the flush ring there are optionally one or two venting and flushing connections. If the ring has only one connection, the cavity between the primary shut-off and the measuring device can be emptied in a controlled manner - for example with a connected hose and a suitable collecting container. For example, the ring can be filled and flushed out with compressed air or a cleaning fluid via the second connection, depending on the requirements that the corresponding medium places on the plant operator.

Advantages of flush rings:

  • The side flushing holes allow material to be rinsed away from the membrane
  • The pressure chamber can be emptied controlled and filled with compressed air or a cleaning fluid and rinsed out
  • Different nominal widths and shapes allow adaptation to the respective process flange
Flush rings of AS-Schneider
AS-Schneider manufactures flush rings exactly according to the system and customer requirements in different sizes and with different connection options.

AS-Schneider offers flush rings in following materials:

  • Carbon Steel
  • Stainless Steel
  • Spezial Alloys
  • Additional inner lining with teflon


AS-Schneider also supplies the flush rings completely prefabricated. Users also benefit from a reduced installation effort.

Get more information: Flush Rings

Image Source: © AS-Schneider
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