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 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 | With optimized maintenance, radial sealing | Single-seat valve, type U_R |
| 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.
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" |
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 N | Type N_V (longstroke) | Type U | Type U_R (radial) | 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) | 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) | 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 | Ra ≤ 0.8 µm
|
| External housing surface | Matte blasted | ||||
| Control and feedback system | T.VIS® 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
| Welded seat ring | Clamped or welded seat ring | |
| Certificates | EHEDG, 3A, CE | 3A, CE | |||
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