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,
| 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″ |
| 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.
REQUEST INFORMATION
Type N, N_V & U, U_V
Please refer to the catalog for more information.
| 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 | ||
| 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″ |
