Since 1879
Hygiene Ventile von Rieger

Control or Modulating valve - hygienic



RIEGER control or modulating valves  are especially convincing in food sector, but also in the pharmacy by strength and durability. This is based on the flow control cones with O-ring sealing which ensure uninterrupted production processes and product safety.

Longer production cycles mean lower maintenance costs and higher productivity.

On the product side, the control valves are equipped with metal control cones. The control behavior (Kv values) can be customized to your processes on site. For this we need as a basis for calculating the desired Kv values at 50 % and 100 % (= Kvs or Cvs) valve opening.

Kv = Cv x 0,86

Cv = Kv x 1,16

Because of the modular system is a change of the actuators between – manual (DN 10-100 or 3/8"-4") or pneumatic with positioner (DN 25-100 or 1"-4") – always possible.


  • Right angle type L
  • Double right angle type T
  • Cross type TT

Recommended Bürkert positioner with (0) 4-20 mA

  • Bürkert 8692 WITH display and control buttons for programming directly to the valve (M12) see Bürkert 0227301
  • Bürkert 8694 WITHOUT display or control buttons for programming directly on the PLS/PC (M12) see Bürkert 0227417
  • Bürkert 8694 WITHOUT display or control buttons for programming directly on the PLS/PC (grommet) see Bürkert 0227411
Construction of the valve massive valve housing
no dead spaces
completely draining
many possible installation orientations
Absolute product protection perfect isolation from the environment
no sump , no dome
Serviceability seal replacement without special tools
low downtime
screwed bellows
perfectly cleanable
Efficiency long lifetime of PTFE bellows
standard seals
minimal maintenance costs
Additional certificates in 3-A-design possible
with PTFE-Bellow (aseptic)   with O-Ring (hygienic)
Material product contact optional not product contact 1.4404/AISI316L
Seals  O-rings/gaskets EPDM
Temperatures maximum   EPDM
  operating temperature

sterilisation temperature
  130 °C*

150 °C* short-time (approx. 20 min)
Operating pressure closing pressure

control air pressure
max. 6 bar
min 6 bar -
max. 10 bar
Surfaces product contact

not product contact
Ra <= 0,8 µm
e-polished, other surfaces on request
Ra <=1,6 µm
Connections Standard- pipe classes DIN 11850-R2 (DIN 11866 A)
O.D.-Tube (DIN 11866 C)
DIN EN ISO 1127 (DIN 11866-B)


the ATEX selection
chart in
PDF as download
… click here

Gebr. Rieger GmbH & Co. KG
Kochertalstraße 32
73431 Aalen - Germany

Tel.: +49 (0) 7361 - 5702-0
Fax: +49 (0) 7361 - 5702-51

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