Hygienic Double Seal Valves N4

RIEGER hygienic 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.

Double seal valve N4 piggable

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.

Materialin contact with product
not in contact with product
(others on request)
Temperaturesmaximum EPDM

continuous operation
steam sterilization
 130 °C*
150 °C*

closing pressure

 control air pressure

max. 10 bar upper line. Lower line see catalogue.
min 6 bar -
max. 10 bar

Surfacesin contact with product

not in contact with product
Ra ≤ 0,8 µm
other surfaces
on request
Ra ≤ 1,6 µm
pipe classes
DIN 11850-R2 (DIN 11866 A)
O.D.-Tube (DIN 11866 C)
DIN EN ISO 1127 (DIN 11866-B)
                                                                                 *dependent upon operating conditions
Port configurations as shown
in picture or in 360° possible.
  • one-piece solid valve body
  • no welding distortion
  • only 3 gaskets + CIP valve
  • additional flush valve optional available
  • safe CIP/SIP cleaning
  • reduced cleaning water consumption
  • low impact on environment and waste water costs
  • utility model protection
  • also available in 3-A version


  • DN 40 – DN 150 
  • 1,5" – 6"

This control top has been developed between AWH and Rieger in collaboration with Bürkert. It serves as a custom-fit solution for our in-house hygienic and aseptic process valves to achieve an even more efficient and precise application.

Contact-free inductive valve position measuring (Teach function)

  • status display luminated in colour
  • integrated control air supply to the actuator
  • field bus port AS-interface, DeviceNet, IO-Link or Bürkert system bus (büS)
  • with ATEX-option:
    Ex II 3 G Ex ec IIC T4 Gc X

    Ex II 3 D Ex tc IIIC T135°C Dc X

FlowStar is available in the models 24 V DC, AS-I bus, IO-Link (Port Class A) or Ethernet IP.
All models  are available as the following alternative:

  • 3 solenoid valves, 3 internal proximity switches + 1 outlet for external proximity switch

Mounting kit integrated in Control Top – no separate mounting kit necessary. Exception for LCV valves, ESV valves.

All Valves are available in special alloys, such as Hastelloy® C-22, 1.4539/904L, 1.4529, AL-6XN® and others.

Directly send us your inquiry:
Tel.: +49 7361 5702-0