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. 


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.

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
Ra ≤ 1.2 µm
Ra ≤ 0.8 µm 

Ra ≤ 0.8 µm 
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

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