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


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 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


Ra ≤ 1.2 µm

Ra ≤ 0.8 µm DN, OD

Ra ≤ 0.8 µm


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
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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Dear partners,

We would like to inform you that in the framework of preventive measures aimed at effectively addressing the spread of “Covid19” disease and in accordance with the National Public Health Organization guidelines (, our company is committed to ensure public health, safety of its partners and employees. Therefore we have recommended the fulfillment of our employees' tasks through teleworking.

The duration of this measure is initially set from 17.03.2020 to 30.04.2020

The design provides full operation, but due to special conditions, delays in specific tasks or communication may occur.

Our company will strive to keep its operation uninterrupted and secure by serving its clientele in ways and timeframes that are judged possible.

We thank you for understanding and we remain at your disposal.

Αγαπητοί Συνεργάτες,

Θα θέλαμε να σας ενημερώσουμε ότι στο πλαίσιο μέτρων πρόληψης με σκοπό την αποτελεσματική αντιμετώπιση εξάπλωσης του κορωνοιού και σύμφωνα με τις οδηγίες υγιεινής & ασφάλειας που έχει ορίσει ο ΕΟΔΥ (, η εταιρία μας για να διασφαλίσει τη δημόσια υγεία, την ασφάλεια των συνεργατών και των εργαζομένων της, συστήσαμε την εκπλήρωση των καθηκόντων των εργαζομένων μας, μέσω τηλεργασίας.

Η διάρκεια του συγκεκριμένου μέτρου ορίζεται αρχικά από τις 17.03.2020 έως τις 30.04.2020

Ο σχεδιασμός προβλέπει πλήρη λειτουργία, ωστόσο εξαιτίας των ειδικών συνθηκών, ενδέχεται να παρουσιαστούν καθυστερήσεις σε συγκεκριμένες εργασίες ή και στην επικοινωνία.

Η εταιρία μας θα προσπαθήσει να διατηρήσει αδιάληπτη και ασφαλή την λειτουργία της, εξυπηρετώντας το πελατολόγιο της με τρόπους και σε χρονικά πλαίσια που κρίνονται δυνατά.

Σας ευχαριστούμε για την κατανόηση και παραμένουμε στην διάθεση σας.