Since 1879
Hygiene Ventile von Rieger

Overflow valve E8 - hygienic


RIEGER Overflow valves E8 are a combination of angle valves and relief valves. Unlike an overflow valve, this valve opens on request up to 100% stroke like shut-off valve. It is possible to seal the overflow valves.

One possible application is the protection of forced-feed pumps e.g. peristaltic pumps.
The overflow valve E8 is suitable for all liquid media.

Overflow valves are no safety valves.

For this purpose we recommend the TÜV certified safety valve type SH.

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)



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


with PTFE-Bellow (aseptic)   with O-Ring (hygienic)


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


Overflow E8 can only be equipped with a proximity sensor with a maximum diameter of 12 mm as electronic feedback.

This is screwed to the bracket between the valve housing and the actuator.

This proximity switch is usually not in scope of delivery.

Or ask us for control tops.



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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