Single-seat valves

VARIVENT® Shut-off valves

VARIVENT® single-seat valves are used for simple shut-off in hygienic applications. The valves are characterized by their ease of operation and flexibility. To avoid water hammers, individual variants in the VARIVENT® modular system are configured for different flow directions.

Special Features

  • Certified, hygienic configuration
  • Metallic stop
  • Flexibility because of the modular principle
  • Proven seal geometry

Valve Selection Scheme: Shut-off Valves

Recommended flow directionFeatureType
From bottom to topModular systemSingle-seat valve, type N
From bottom to topLong-stroke valves for viscous products or products with large particlesSingle-seat long-stroke valve,
type N_V
From top to bottomModular systemSingle-seat valve, type U
From top to bottomWith optimized maintenance, radial sealingSingle-seat valve, type U_R
From top to bottomLong-stroke valves for  viscous products or products with large particlesSingle-seat long-stroke valve,
type U_V

Recommended Flow Direction

To avoid water hammers when closing the valve while the product is flowing, single-seat shut-off valves should be switched against the flow direction of the product.

Valve type N is designed for a flow from the lower to the upper pipeline, whereas valve type U is for the opposite flow direction. 

VARIVENT® Series

The structure of the VARIVENT® modular system has many optional versions available to best optimize the valve in the process. Please refer to the options section in the catalog for information about these.

Sizes
Single-seat shut-off valvesLong-stroke shut-off valves
DN 25 – DN 150DN 65 – DN 100
OD 1" – OD 6"OD 2 ½" – OD 4"
IPS 2" – IPS 6"

Application Examples

In practical use, these valves are used

  • as emptying / drainage valves
  • for shutting off a bypass line
  • as dosing valves

VARIVENT® long-stroke valves are used for transporting fluids with relatively large particles or for viscous products, such as yoghurt with pieces of fruit.

Technical Data

Type N, N_V & U, U_V, U_RPlease refer to the catalog for information.
Type NType N_V (longstroke)Type UType U_R (radial)Type U_V (longstroke)
Recommended flow directionFrom bottom to topFrom top to bottom
Material in contact with the product1.4404 / AISI 316 L
Material not in contact with the product1.4301 / AISI 304
Seal material in contact with the productEPDM, FKM, HNBR
Ambient temperature0 to 45 °C
Air supply pressure6 bar (87 psi)4.8 bar (70 psi)6 bar (87 psi)6 bar (87 psi)4.8 bar (70 psi)
Product pressure5 bar (73 psi)DN 65 – DN 80 OD 2 ½" – OD 3" 10 bar (145 psi) DN 100 & OD 4"
5.2 bar (75 psi)
5 bar (73 psi)5 bar (73 psi)DN 80
OD 3"
5 bar (73 psi)
DN 100 & OD 4"
5.6 bar (81 psi)
Surface in contact with the productDN, OD
Ra ≤ 0.8 µm
IPS
Ra ≤ 1.2 µm
Ra ≤ 0.8 µm 

DN, OD
Ra ≤ 0.8 µm 
IPS
Ra ≤ 1.2 µm
Ra ≤ 0.8 µmRa ≤ 0.8 µm   

External housing surfaceMatte blasted
Control and feedback systemT.VIS® control top
Actuator typePneumatic actuator air / spring
Connection fittingsWelding end
IdentificationAdhesive ID tag
Valve seat versionClamped or welded seat ringClamped or welded seat ring
Welded seat ringClamped or welded seat ring
CertificatesEHEDG, 3A, CE3A, CE

GEA Insights

A bowl of pasta with cultivated meat

GEA brings alternative protein expertise to U.S.

A new GEA technology center for developing alternatives to meat, dairy, seafood and eggs in Wisconsin, will help accelerate novel food production in the U.S. market

Future-proofing the cold chain with sustainable refrigeration

The importance of quality cold chain management cannot be underestimated. Ensuring that perishable foodstuffs are safe and of high quality at the point of consumption is a tremendous responsibility for those operating cold chain...

GEA employees - separation

Separate from the rest

The story of the GEA centrifuge begins in 1893, when Franz Ramesohl and Franz Schmidt began production of their patented mechanical milk separator, paving the way for modern dairy processing. The innovation helped overcome a...

Receive news from GEA

Stay in touch with GEA innovations and stories by signing up for news from GEA.

Contact us

We are here to help! With just a few details we will be able to respond to your inquiry.