0102030405
Fabricated Steel Cone Valve with Large Diameter for Water Projects
I. Full Product Name
Electric Fixed Cone Valve with Diffuser for Free Discharge (Model: ZFL941YX)
International General Name: Howell-Bunger Valve with Diffuser (Fixed Cone Discharge Valve)
International General Name: Howell-Bunger Valve with Diffuser (Fixed Cone Discharge Valve)
II. Core Product Features
-
High-Efficiency Energy Dissipation & Anti-Scouring Protection
Equipped with an outlet diffuser, it utilizes a triple energy dissipation mechanism (air entrainment, collision, and diffusion) to significantly reduce outlet flow velocity. This prevents scouring damage to downstream river channels and facilities, achieving an energy dissipation efficiency of over 85%. -
High Flow Rate & High Head Application
Specially designed for high-head discharge conditions in reservoirs, hydropower stations, and storage basins. The full-open flow coefficient k≥1.7, offering over 30% higher flow capacity than traditional gate or butterfly valves. -
Anti-Cavitation Design & Long Service Life
The fixed cone + sleeve structure ensures water flows out evenly in a ring shape, avoiding local vortices and cavitation. Internal flow components can be overlay-welded with hard alloys for superior scour and corrosion resistance. -
Precise Regulation & Flexible Operation
Driven by electric or hydraulic actuators, the sleeve moves axially to adjust the flow area. It achieves a flow regulation ratio of up to 100:1, enabling continuous adjustment from 0% to 100% opening to meet various discharge demands. -
Reliable Sealing & Zero Internal Leakage
Features a dual structure of hard and soft seals. When fully closed, the leakage meets the Grade Zero requirement of the GB/T13927 standard. The valve stem is designed with anti-loosening and anti-displacement features, ensuring no jamming during long-term operation.
III. Detailed Technical Parameters
| Parameter Item | Specification |
|---|---|
| Nominal Diameter (DN) | DN200~DN2000 (Customizable up to DN3000) |
| Nominal Pressure (PN) | PN0.6 |
| Applicable Media | Clean water, sewage, neutral liquids with trace impurities |
| Media Temperature | -29℃ |
| Drive Method | Electric (Outdoor / Explosion-proof), Hydraulic, Pneumatic, Manual |
| Connection Type | Flange Connection (Standard GB/T 9113), Welding Connection |
| Body Material | Carbon Steel (WCB), Stainless Steel (304/316L), Ductile Iron (QT450) |
| Trim Material | Fixed Cone: SS / Hard Alloy Overlay; Sleeve: Carbon Steel with Wear-resistant Liner / SS |
| Diffuser Material | Carbon Steel with Anti-corrosion / Stainless Steel (Diameter ≥ 2×DN to meet energy dissipation requirements) |
| Regulation Characteristics | Approximate linear regulation, Regulation accuracy ±1% |
| Strength Test Pressure | 1.5×PN |
| Sealing Test Pressure | 1.1×PN |
| Applicable Standards | Ministry of Water Resources SD316-89, GB/T 13927 "Industrial Valves - Pressure Testing" |
| Typical Applications | Reservoir/Dam flood discharge, Hydropower station bypass discharge, Storage basin drainage, Pump station pressure regulation, End-of-line energy dissipation for long-distance pipelines |
IV. Structure & Working Principle
1. Core Structure: Composed of an inlet flange, fixed cone (with guide vanes), movable sleeve, drive mechanism, valve body, and outlet diffuser.
2. Working Principle:
2. Working Principle:
- High-pressure water from the upstream enters through the inlet flange and flows out through the annular gap between the fixed cone and the sleeve.
- The drive mechanism moves the sleeve axially to change the opening of the annular gap, thereby regulating the flow rate.
- After being ejected from the annular gap, the water enters the diffuser where it undergoes air entrainment and diffusion. The kinetic energy is significantly consumed, allowing for stable discharge downstream and preventing scouring damage.
V. Optional Configurations & Customization Services
- Drive Customization: Outdoor rain-proof, IP68 waterproof, and explosion-proof electric actuators.
- Material Customization: For seawater or corrosive media, Duplex Stainless Steel, rubber/plastic lining, or anti-corrosion treatments can be adopted.
- Accessory Customization: Flow feedback devices, opening position indicators, local/remote control modules.
- Non-standard Customization: Special diameters, special pressures, and custom diffuser/valve body structures with specific installation dimensions.
VI. Installation & Maintenance Instructions
- Installation Position: Install at the end of the pipeline, with the outlet facing the diffuser or stilling basin directly to prevent the outlet flow from directly impacting structures.
- Installation Direction: Install horizontally. Align the inlet flange with the pipeline, and ensure the outlet diffuser is securely fixed.
- Maintenance Cycle: Inspect the wear condition of the sleeve and cone every 6 months; lubricate and maintain the drive mechanism every 12 months.
- Precautions: Avoid long-term operation at small openings to prevent local scouring and cavitation damage.