Shut-off Valves VARIVENT® N, N_V,U, U_V

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

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 valves Long-stroke shut-off valves
DN 25 – DN 150 DN 65 – DN 100
OD 1″ – OD 6″ OD 2 ½” – OD 4″
IPS 2″ – IPS 6″
Valve Selection Scheme: Shut-off Valves
Recommended Flow Direction Feature Type
from Bottom to Top Modular System Single-seat Valve, Type N
from Bottom to Top Long-stroke valves for Viscous Products or Products with large Particles Single-seat Long-stroke Valve,

Type N_V

from Top to Bottom Modular System Single-seat Valve, Type U
from Top to Bottom Long-stroke valves for  Viscous Products or Products with large Particles Single-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.

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.

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Type N, N_V & U, U_V

Please refer to the catalog for more information.

Technical Data of the Standard Version
Type N Type N_V (Longstroke) Type U Type U_V (Longstroke)
Recommended flow direction From bottom to top From top to bottom
Material in contact with the product 1.4404 / AISI 316 L
Material not in contact with the product 1.4301 / AISI 304
Seal material in contact with the product EPDM, FKM, HNBR
Ambient temperature 0 to 45 °C
Air supply pressure 6 bar (87 psi) 4.8 bar (70 psi) 6 bar (87 psi) 4.8 bar (70 psi)
Product pressure 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) DN 80

OD 3″

5 bar (73 psi)

DN 100 & OD 4″

5.6 bar (81 psi)

Surface in contact with the product DN, 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 µm
External housing surface Matte blasted
Control and feedback system Connection 0 (without control top)
Actuator type Pneumatic actuator air / spring
Connection fittings Welding end
Identification Adhesive ID tag
Valve seat version Clamped or welded seat ring Clamped or welded seat ring
Certificates EHEDG, A3, CE A3, CE
Sizes
Double-seal valves, type C valves Double-seat valves, type K
DN 25 – DN 150 DN 25 – DN 150
OD 1″ – OD 6″ OD 1″ – OD 6″
IPS 2″ – IPS 6″

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