Butterfly control valves  (click picture to enlarge)
The sealing inserts are usually replaceable, and the valves themselves can be fitted with any type of
actuator system that you want.

All the nominal sizes are standard. Other sizes are available on request.

Technical data and dimension sheets are available for all the series listed here. They can be read or downloaded
as PDF files.
Ring flow control and closing valves
Type: RD / RA
Series: 033 + 034
Nominal diameter 32 - 500 
PN 6 / 10 / 16

Data sheet.pdf (664 KB)*
Operating instructions.pdf
(143 KB)*
Plant construction, oven construction, cogeneration-heating plant, exhaust air technology, steel plants,
Designed for temperatures up to 550 °C, depending on material and operating conditions.
Type: HRD / HRA
Series: 016 + 019
Nominal diameter 50 - 1200 
PN 6 / 10
Plant construction, oven construction, cogeneration-heating plant, engine test bench, exhaust air technology, steel plants
Designed for temperatures up to 550 °C, depending on material and operating conditions.
Data sheet.pdf (668 KB)*
Operating instructions.pdf
(164 KB)*
 Flowrate characteristics.pdf (81 KB)*
Type: HRD / HRA
Series: 015 + 018
Nominal diameter 50 - 1200 
PN 6 / 10
Welded construction
Up to 550 °C
Plant construction, oven construction, shipbuilding, engine test bench, exhaust air technology, steel plants, chemical industry
Designed for temperatures up to 550 °C, depending on material and operating conditions.
Data sheet.pdf (672 KB)*
Operating instructions.pdf
 (164 KB)*
 Flowrate characteristics.pdf (81 KB)*
High-temperature valves
Type: HRD / HRA
Series: 015 + 018
Nominal diameter50 - 1200 
PN 6 / 10
Welded construction
From 550 °C bis 900 °C
Plant construction, oven construction, shipbuilding, engine test bench, exhaust air technology, steel plants, chemical industry
Designed for temperatures from 550 °C to
900 °C, depending on material and operating conditions.
Data sheet.pdf (660 KB)*
Operating instructions.pdf
(164 KB)*
 Flowrate characteristics.pdf (81 KB)*
Butterfly control valves
Type: LDKe / LDKf
Series: 084 + 086
Nominal diameter 63 - 2000 
For air-treatment equipment
in accordance with
DIN 24 154 T2/R2
Waste air equipment, building and
air-conditioning equipment
Can be used at operating temperatures from
-40 °C up to 1050 °C, depending on the
material chosen
Data sheet.pdf (2,4 MB)*
Fitting specifications.pdf (52 KB)*
 Flowrate characteristics.pdf (88 KB)*

* These files require the Adobe Reader