Barthel 流量计

Measuring and controlling engineering

Standard Orifice Plate with Annular Chamber (from DN 50 to PN 100)

Annular chamber orifice plates consist of 2 fitting rings between which a measuring disc is clamped. Pressure is tapped via the annular gap directly on the front and rear side of the measuring disc.

The annular gaps lead to annular chambers, from which the pressure is tapped via the tapping nozzles.

The annular chamber orifice plate is advantageous in that the chamber allows uneven pressure ratios on the measuring disc to be equalised. And in that the measuring disc is able to be replaced.

We manufacture the orifice plates in all materials requested and with corresponding certifications.

Standard Orifice Plate with Single Bore (from DN 50)

Standard orifice plates have a stronger outer ring which allows the tapping nozzle to be fitted directly on the orifice plate. Pressure is tapped via single bores. The orifice plate is clamped between normal flanges.

The orifice plates are mainly manufactured from heat-resistant or stainless steel, or from special material when requested.

Plug-In Orifice Plates (starting from DN 50)

Plug-in orifice plates are measuring discs that are fixed in between special measuring flanges. As the pressure pulse cannot be tapped directly at the measuring disc, pressure taps are conducted via bores in the flange (flange pressure tap) or by tapping the tubing (D:D/2 pressure tap).

Compared to all other choke devices, plug-in orifice plates are the most cost-effective.
We manufacture the plug-in orifice plates from all materials requested with the desired certifications that correspond to these - mainly, however, in CrNi steel.

Welding devices (starting from DN 50)

Choke devices to be welded into installations are mainly manufactured out of heat-resistant, stainless, or special material.

We manufacture them in all forms, chiefly as orifice plates and venturi nozzles.

Nozzles (starting from DN 50)

Standard nozzles are clamped between flanges either directly or with 2 fitting rings. Pressure is tapped via single bores or via annular gaps directly on the front or rear side.
The annular gaps lead to an annular chamber, from which the pressure is tapped via tapping nozzles.
The following are available:
 ISA-1932 nozzles
 Long-radius nozzles
 1/4-circle nozzles

Venturi Nozzles (starting from DN 50)

Standard venturi nozzles have a low residual pressure loss due to the rounded inlet edge and the conical gradient. The outlet cone is usually shortened with this design.

Pressure can be tapped either directly as a single bore, or via a ring line.

Measuring Sections (DN 10 to DN 50)

Measuring sections consist of an orifice plate, as well as the uninterrupted in-feed and out-feed sections stipulated by the standard. Choke devices in the form of a measuring section are supplied predominantly for nominal widths DN 10 to DN 50.

The tube for the in-feed and out-feed is a special tube with a guaranteed surface roughness, dimensional stability and roundness.

Venturi Tubes (from DN 50)

Out of all the choke devices, venturi tubes have the lowest residual pressure loss and require the shortest in-feed and out-feed sections. We produce the venturi tubes in various designs, all materials requested, and with the desired certifications that correspond to these.

Mainly from solid rods in order to avoid longitudinal and circular weld seams.

Special Devices

Deviating from the principle of scaling down tubing cross-sections, special devices allow the kinetic flow energy to be converted into differential pressure without any significant change to the cross-section. The integrating pressure tube, as well as the Pitot tube or Prandtl pressure tube, detects the plus pulse via bores in the direction of the flow, and the minus pulse via bores at right angles to these in order to obtain a measurement.
The advantage here is the low residual pressure loss, reduced assembly costs, and, in the case of large nominal widths, the relatively low price.
It is important to note that this type of device uses very little differential pressure and gets dirty more easily.