| 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 |
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.
In practical use, these valves are used
VARIVENT® long-stroke valves are used for transporting fluids with relatively large particles or for viscous products, such as yoghurt with pieces of fruit.
Please refer to the catalog for 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 | ||
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