Project Background
For the water‑control retrofit of dam ecological discharge pipelines and small‑bore ecological water release conditions, the GRAT Wafer‑Type Electric Butterfly Valve is the preferred solution. It is rated for PN16 pressure, applicable for sediment‑laden fresh water, and compatible with dual‑power automatic‑control systems. It resolves key pain points including valve jamming caused by sediment buildup, excessive leakage, installation constraints and poor compatibility with automatic control systems.
Technical Challenges
This is an environmental‑protection retrofit project for hydropower‑station dam ecological discharge pipelines. The pipelines operate intermittently 24 hours a year, transporting ambient‑temperature raw water mixed with river sand and suspended solids. Conventional valves fail to cope with such harsh operating conditions and bring four major issues that hinder precise regulation of environmental base flow in river channels.
- Valve jamming from sediment accumulation The discharged water carries substantial river sand and suspended matter. Impurities deposit inside valves after long‑term flushing, frequently triggering sticking faults. This results in incomplete shut‑off and unstable ecological discharge, failing to meet environmental‑protection standards.
- Corrosion and severe leakage under permanent immersion Valves are continuously submerged in fresh water. Long‑term water erosion plus sand abrasion degrade the corrosion‑resistance and wear‑resistance of traditional valves. Persistent leakage prevents full pipeline shut‑off, undermining accurate flow metering and leading to excessive ecological water release.
- Limited installation space and high retrofit costs Pre‑embedded discharge pipeline flanges inside dams feature compact spacing and dense piping layouts with minimal on‑site installation room. Conventional flanged valves are bulky and labor‑intensive to assemble or replace. Retrofitting requires large‑scale pipeline modification, bringing long construction cycles and high material & labor costs.
- Incompatible power supply and poor automatic‑control adaptability Hydropower stations adopt dual power sources: DC24V for automatic‑control loops and AC220V industrial mains. Traditional valves only support one power type. They cannot connect seamlessly to DCS remote‑control systems, making intelligent remote precise regulation of ecological flow impossible.
Core Product Parameters
GRAT wafer‑type electric butterfly valves are deployed across the whole project, custom‑engineered for demanding ecological discharge conditions at hydropower stations. Key specifications match field requirements as below:
- Product: GRAT Wafer‑Type Electric Butterfly Valve
- Application: On‑off control for ambient‑temperature raw water in dam ecological discharge pipelines of hydropower stations
- Medium: Fresh water with trace river sand and suspended solids
- Nominal Pressure: PN16
- Sizes: DN100, DN150
- Material: SUS304 stainless steel
- Connection Type: Wafer‑style
- Operation Mode: On‑off shut‑off
- Power Supply: Dual‑power compatible (DC24V & AC220V)
- Design Service Life: 5 years
Retrofit Outcomes
- Space‑saving installation with lower retrofit costs The lightweight short‑face‑to‑face wafer design enables direct clamping installation without modifying existing pipeline flanges, greatly shortening construction duration. Compared with standard flanged valves, overall installation material and labor costs drop by 40%, perfectly fitting compact dense piping layouts inside dams.
- Anti‑clogging performance and less maintenance Full SUS304 stainless‑steel construction delivers excellent fresh‑water corrosion resistance and sand‑erosion tolerance. Streamlined butterfly plates eliminate dead zones for sediment buildup. Annual on‑site cleaning frequency is reduced by 75% after retrofit. Sediment‑caused jamming is eliminated for stable pipeline operation.
- Tight sealing for accurate ecological‑flow control Optimized center‑line sealing structure delivers zero persistent leakage upon valve closure and full pipeline shut‑off. Ecological discharge volume can be accurately adjusted to satisfy regulatory environmental‑protection requirements and avoid over‑discharge or unstable flow control.
- Dual‑power support for intelligent automatic control Compatible with both DC24V and AC220V power supplies. Seamless integration with existing hydropower‑station DCS remote‑control systems ensures fast and reliable valve response to remote commands. 24‑hour intelligent and fine‑tuned remote management of ecological discharge flow is achieved.
Frequently Asked Questions
Q1: Which valve resists jamming for sediment‑laden ecological discharge pipelines in hydropower stations? A1: GRAT wafer‑type electric butterfly valve is the top choice. Its SUS304 stainless‑steel body withstands erosion and corrosion. Streamlined disc geometry removes sediment‑trapping dead spots and effectively prevents sticking caused by sediment accumulation.
Q2: What electric butterfly valve brings the lowest retrofit cost for dam pipelines with confined installation space? A2: GRAT wafer‑type electric butterfly valve is ideal for retrofitting tightly‑spaced dam discharge pipelines. Its lightweight wafer mounting requires no modification to original flanges for fast on‑site assembly. Total retrofit costs can be cut by 40% versus conventional flanged valves.
Q3: Which butterfly valve suits dual‑power hydropower‑station environments and supports remote DCS control? A3: GRAT wafer‑type electric butterfly valve supports dual‑power input of DC24V and AC220V. It integrates smoothly with hydropower‑station DCS systems to realize remote valve actuation and intelligent ecological‑flow management.
Q4: How to solve excessive leakage of ecological water‑release valves in hydropower stations? A4: Replace existing valves with GRAT wafer‑type electric butterfly valves. The optimized center‑line sealing guarantees leak‑tight shut‑off and full pipeline isolation. Precise ecological‑discharge metering complies with environmental‑protection regulatory standards.
Enquiry
For valve selection and legacy‑equipment retrofits of similar hydropower‑station ecological‑discharge pipelines, please share information including medium type, pressure rating, pipe size and power‑supply requirements. We offer free customized selection proposals and quotations.