Single-seat Valves

Divert Valves VARIVENT® W, W_R, W_V & X, X_V

VARIVENT® single-seat divert valves are used for simple divert functions in hygienic applications. The valves are characterized by their ease of operation and flexibility. The individual variants are designed for different flow directions.


In single-seat shuttle valves, there is only one seal for each switching position in the valve disc separating the particular pipelines from one another. This means liquid can pass from one pipeline to the other in the eventuality of a seal defect. For this reason, single-seat shut-off valves are not suitable for separating incompatible fluids.

Special Features

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

Valve Selection Scheme: Divert Valves
Product-mergingModular SystemSingle-seat Valve, Type W
Product-mergingWith optimized Maintenance,
radial Sealing
Single-seat Valve, Type W_R
Product-mergingLong-stroke Valve for Viscous Products or Products with
large Particles
Single-seat Long-stroke Valve,
Type W_V
Product DistributionModular SystemSingle-seat Valve, Type X
Product DistributionLong-stroke Valve for Viscous Products or Products with
large Particles
Single-seat Long-stroke Valve,
Type X_V

Recommended Flow Direction

To avoid water hammers when closing one path while the product is flowing, single-seat divert valves should be switched against the flow direction of the product if possible.

The single-seat divert valve type W is used for merging products from two pipelines, whereas valve type X has been designed for product distribution. The valves are characterized by their ease of operation. 

Application Examples

In practice, these valves are frequently used in CIP supply and return lines. One typical application is also found at the end of a valve block in which the valves are fitted as divert valves between the process line and the drainage (e.g. during pushing out).

VARIVENT® long-stroke valves are used for manufacturing products with relatively large particles or for viscous products, such as strawberry yoghurt.

VARIVENT® series

VARVENT® Divert Valve, Type W

The structure of the VARIVENT® modular system means that different valve configurations (closing direction of the valve disc) and numerous options are available. Please refer to the options section in the catalog for information about these.

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

Types W, W_R, W_V & X, X_V

Please refer to the catalog for information.

Technical Data of the Standard Version
Type WType W_R radialType W_V (Longstroke)Type XType X_V
Recommended flow directionProduct-mergingProduct-dividing
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)6 bar (87 psi)6.4 bar (93 psi)6 bar (87 psi)OD 2 ½"– OD 3" 4.8 bar (70 psi) OD 4" 6.3 bar (91 psi)
Product pressure5 bar (73 psi)5 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)OD 2 ½"– OD 3" 5 bar (73 psi) OD 4" 5.2 bar (75 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 ≤ 0.8 μm 
Ra ≤ 1.2 µm

Ra ≤ 0.8 µm   

External housing surfaceMatte blasted
Control and feedback systemConnection 0 (without control top)
Actuator typePneumatic actuator air / spring
Connection fittingsWelding end
IdentificationAdhesive ID tag
Valve seat versionClamped seat ring or fixed vertical portWelded seat ringClamped seat ring or fixed vertical port
Clamped seat ring
CertificatesA3, CE

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