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.
- Certified, hygienic configuration
- Metallic stop
- Flexibility because of the modular principle
- Proven seal geometry
| 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 |
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.
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” | |
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.
Type N, N_V & U, U_V, U_R. Please 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 bottom to top | |||
| 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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