Since 1879
Hygiene Ventile von Rieger

Double seal valve N4 piggable or high viscosity - hygienic


RIEGER hygiene double seal valves N4 are piggable or applicable for highly viscous media. They provide reliable protection for your product by leak-proof separating not compatible products. They prove themselves worldwide in systems for the beverage and food industries.

The design of its one-piece valve housing and the two radial sealings of both valve seats allow, together with the balanced valve disks a perfectly safe CIP/SIP cleaning and an extremely high level of security for your products.

In this model, the two valve seats can be alternatively lifted.

The development of the RIEGER double sealing valve DD to the piggable variant N4 allows users great savings in resources.

The cost savings of product, water, cleaning agents, environmental pollution recoup the investment within a very short time.



DN 40 - 100
  • one-piece solid valve housing
  • no welding distortion in the product space
  • only 3 seals + CIP valve
  • additional flushing valve optional
  • secure CIP/SIP cleaning
  • maximum product benefits
  • minimization of cleaning water consumption
  • minimizing chemical consumption
  • low environmental impact and waste costs
  • valve has utility model protection
  • available in 3-A variant



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. 10 bar upper line
lower line see catalogue
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)


Recommended Bürkert control tops for aseptic valves with 24 VDC or ASI bus

Contactless position with three switching points (teach-in function) with 3 internal feedback sensors, 1 output for external feedback (external feedback not included)

Two alternatives:

© Bürkert
24V DC with 4 digital outputs screw terminals, cable gland:
AS-Interface with a maximum of 62 slaves flat cable clamp with 1 m cable
  • 0 solenoid valve e.g. for single seat valves - pure feedback function
  • 1 solenoid valve for e.g. for single seat valves with actuators NC or NO
  • 2 solenoid valves for e.g. for single seat valves with air/air actuator or double seat valves N5, N9
  • 3 solenoid valves for e.g. double seat valves N1, N2, N3, N4, N7, N13
For more details see website Bürkert


Valve open-close Valve seat lift


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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