FAQ - Pipe Manometer

General principles

It is used to detect rough pressure fluctuations in the line.

Since liquids have virtually no compressibility, they are better suited for pressure transmission than air or other gaseous media.

The pressure display can be optionally equipped with an additional pressure switch.

As a standard, we supply the devices for a pipe pressure up to 70 bar with a pressure display of up to 100 bar. Smaller pressure ranges are possible as a special design.

Fields of application

They are commonly used, for example, on mortar plastering machines where plaster is conveyed for long distances.

The pipe manometers can generally be used for all possible media.

Due to the low water content of the glycerine filling, a pipe manometer can only be used conditionally at sub-zero temperatures.

Connections & materials

The housing, connection parts, and hoop guards for the type RDM pipe manometer are produced from steel. The sleeve is standardly produced from fibre-reinforced natural rubber. Depending on the media, however, other elastomers can also be used. The mediator liquid is either glycerine, silicone oil or other liquids, depending on the application.

Connections referred to as "Father and mother couplings" can be offered and supplied on request for the type RDM. Numerous connection types are available when a pinch valve is used as a pipe manometer. These include flange clamps, internally threaded spigots tri-clamps, weld-on ends and threaded spigot connections (dairy pipe).


Yes, this is very easy and can be done without special tools.

Function & technology

The pipe manometer (Type RDM) is a simple and cost-effective measuring device for the visualisation of the prevailing pressure in a pipeline system.

A sleeve surrounded by liquid is installed in the pipe manometer interior. The expansion of the sleeve by a pressure increase increases the pressure of the mediator liquid which is transmitted to the measuring element of a pipe spring pressure gauge and displayed there.

The pipe manometer (Type RDM) is designed for operating pressures up to 70 bar. This pipe manometer therefore displays pressure fluctuations in the range starting at 2-3 bar. In turn, the pipe manometers which can be set up from a pinch valve can display smaller pressure fluctuations between 0.1 - 0.3 bar. Smaller pressure fluctuations can also be displayed when softer elastomer mixtures and sleeves are used.

The maximum operating pressure of the type RDM pipe manometer is 70 bar. The maximum operating pressure of the V/VF/VMC/VMF/VM pipe manometers is 6 bar.

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