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Flush Rings

Diaphragm Seal Accessories meet safety standards and environmental protection.

The ultimate facts about

Flush Rings

Flush Rings help in proper and environmentally friendly disposal of gas or liquid residues during the maintenance and repair of measuring assemblies and accordingly prevent clogging of the instrument connection.

Traditional Flushing

Flushing is done either by using impulse lines in combination with valves or by using rings which are fixed by clamping. This method has several disadvantages, like time-consumption and leakage.

Example of a traditional flushing option.

Close-coupled flush rings

Unlike impulse lines or clamped rings, Close-Coupled Flush Rings are easier to use. This type of Flush Ring is easy to handle as it is a true plug & play application, which can be installed directly on site without any additional work such as disassembly during maintenance.

Example of a Close-Coupled Flush Ring option.

Application fields

In the chemical industry, Flush Rings are essential. The industry uses them on diaphragm seals to prevent clogging of the instrument connection. A technician mounts the ring, which has flushing ports between the process flange and the diaphragm seal. These flushing ports allow users to wash out particles from in front of the diaphragm. It also has a pressure chamber with which users can vent, drain or fill with cleaning liquid in order to clean the chamber.

Additionally the flush ports can be used to calibrate the instrument by pressurizing the cavity and calibrating the instrument against the pressure.

mounting example

Mounting example of a Close-Coupled Flush Ring.

Benefits of
close-coupled flush rings

The impulse lines used for Traditional Flushing require lots of planning. They are also tricky and time consuming to install. Close-Coupled Flush Rings have a simple installation process using a direct connection to the process line without impulse lines. It is a true plug and play application.

With close coupling, engineers and technicians can start the assembling process right away. They don‘t lose time commissioning loose parts, bending pipes, and testing. Technicians can omit pressure trials on the measuring line.

Close coupling also reduces the risk of leakage, a critical topic in the oil & gas, chemical, and petrochemical industries. These industries must provide leak-free and accurate storage of fuel, oil, gas, various chemicals and waste water. The holding capacity of the storage tanks is often several million liters. Leaks can be disastrous to both the company and the environment.

While the tight seal of the Close-Coupled Flush Rings reduces vibrations, a clean orifice is achieved by flushing. A combination of both result in a higher accuracy of measure.

After the primary isolation valve is closed, a small amount of the pressurized medium remains in the pipeline section. This residual medium gets trapped between the primary isolation valve and the transmitter.

The operator must collect and dispose of this media in a manner that meets regulatory standards and without injury to health. Close-Coupled Flush Rings are a reliable method to empty the cavity between the primary isolation valve and transmitter.

Some of the substances contained in the storage tanks are corrosive or toxic. Others are flammable or environmentally hazardous. The technician must ensure that there is a system to capture and dispose all such gases and liquids.

Proper disposal is a legal requirement. The only exceptions are nitrogen, oxygen, and drinking water. Flush Rings support operators to properly dispose of accumulating gas and liquid residues during maintenance and repair operations of measuring assemblies.

Environmental protection

Strict conditions apply to process plants in the chemical industry: Safety and environmental protection always have to be ensured, because not all processed substances are harmless to human and nature. This also implies, that gases or liquids mustn’t escape from the plants either during operation or maintenance.

The Close-Coupled Flush Rings help operators to properly dispose of accumulating gas and liquid residues during maintenance and repairs of measuring assemblies. The welded drain connections provide safety while the cavity is pressurized or filled with media.

Technical Details of

close-coupled flush rings

Standards & Presure

Design &

CODES & Specifications

Feature overview of

close-coupled flush rings

Standard application of a Close-Coupled Flush Ring.

Standard Features

Optional application of a Close-Coupled Flush Ring.
Optional Features