Bottom-outlet valve as end-of-line valve for very high discharge rates with a largely linear control characteristic. The hollow-jet principle converts energy intensively by tearing the water jet umbrella-like over a guiding cone — cavitation-free in all control positions. DN 400–2000, PN 10. Flow velocities up to 25 m/s. Double sealing system (metallic + soft) with profile sealing ring replaceable without pipeline disassembly. Operation via two lateral stems and bevel gearboxes — mechanical, electrical, or hydraulic actuation.
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▸ Key Features
- Cone valve consisting of body and cylindrical sleeve — umbrella-like tearing open of water jet via jet guiding cone
- Axially symmetric flow pattern with annular flow cross-section in every position
- Cavitation-free discharge in all control positions — vibration-free operation
- Very high discharge capacity — flow velocities up to 25 m/s
- Largely linear control characteristic
- Intensive energy conversion at emergence of water jet — low material strain
- Free discharge of sediments — stones and rubble pass without damaging the valve
- Low actuating torque due to pressure-balanced control sleeve and guide rails
- Adjustable sliding shoes (DN 1000 and above; adjustable before and during operation)
- Double sealing system — metallic and soft sealing on downstream side
- Profile sealing ring replaceable without disassembling the valve from the pipeline
- High-durability hard-faced seat areas
- Operation by two lateral stems and bevel gearboxes, connected by stem extension to double bevel gearbox on top
- Up to DN 1600: no foundation (valve support) required
- Submerged installation possible if required
▸ Technical Specifications
| Parameter | Value |
|---|---|
| Valve type | Hollow-jet discharge valve (fixed cone / Howell-Bunger), end-of-line |
| Nominal diameters | DN 400 – 2000 |
| Nominal pressure | PN 10 |
| Flanges | EN 1092-1, flange connection |
| Max. flow velocity | Up to 25 m/s |
| Control characteristic | Largely linear |
| Sealing | Double sealing — metallic + soft (NBR profile seal) on downstream side |
| Medium | Water, raw water, cooling water |
▸ Materials
| Component | Material |
|---|---|
| Body (structural parts) | Welded steel S235JRG |
| Jacket pipe / sliding face | Stainless steel 1.4541 |
| Cylindrical sleeve / sliding rails | Stainless steel |
| Seat areas | Hard-faced (weld overlay) |
| Sealing | NBR (profile sealing ring) |
| Special version | Completely manufactured from stainless steel (project-specific) |
▸ Available Options
▸ Applications
- Dams — bottom outlets, flood discharge, reservoir management
- Hydropower stations — discharge control
- Drinking water reservoirs
- Man-made reservoirs
- Stormwater retaining basins