Power Generation
Power generation systems demand highly reliable and stable flow control. ZZJG butterfly valves are widely used in thermal and nuclear power plants, offering durable sealing, precise operation and long service life under high temperature and high pressure conditions.
Fuel System
Application Area
Flue Gas Damper
Media & Operating Conditions
- Media: Boiler Flue Gas (SOx, NOx, dust)
- Size: >DN1000 (often rectangular)
- Temp: 120°C ~ 200°C
Selection Challenge
- Structural rigidity for very large sizes to prevent distortion.
- High temperature and dust erosion on seals and bearings.
- Low leakage rate is critical for SCR/FGD efficiency.
Recommended Valve Type
ZZJG series Triple Offset Damper
Recommended Actuator
Electric Actuator (with linkage assembly)
Material Configuration
- Body: Carbon Steel Q235B / A36
- Disc: Carbon Steel (with stiffeners)
- Stem: SS410 / SS316
- Seat: Multi-layer stainless steel metal seal
Selection Reasoning
- Superior Sealing: Compared to traditional louver dampers, our Triple Offset design can achieve leakage rates below 0.5%, significantly improving flue gas treatment efficiency and meeting strict environmental standards.
- Structural Advantage: By adapting mature TOV technology, we provide a structurally stable, low-torque, and reliable sealing solution for even the largest ducts.
Water-Steam Cycle
Application Area
Condensate Polishing Plant
Media & Operating Conditions
- Media: High-Purity/Demineralized Water
- Pressure: PN16 / PN25
- Temp: 40°C ~ 60°C
Selection Challenge
- Prevent secondary contamination (no metal ion leaching).
- Resist chemical corrosion from regeneration acids/alkalis.
Recommended Valve Type
Heavy-Body Series Stainless Steel
Recommended Actuator
Electric On/Off Actuator
Material Configuration
- Body: A351 CF8M (316 SS)
- Disc: A351 CF3M (316L, Mirror Polish)
- Stem: SS316L
- Seat: EPDM (Food Grade) / PTFE
Selection Reasoning
- Purity Assurance: Full 316/316L wetted parts with a mirror-polished disc minimize ion leaching and bacterial adhesion, protecting expensive boilers and resin beds.
- Cost-Performance: A resilient-seated centric design provides reliable bi-directional zero-leakage and is the most cost-effective solution for this clean service.
Auxiliary / BOP Systems
Application Area
Raw Water Intake System
Media & Operating Conditions
- Media: River/Lake Water (with silt, organisms)
- Size: DN300 - DN2000+
- Pressure: PN6 / PN10
Selection Challenge
- Balancing performance and cost for large diameters.
- Resistance to corrosion and impurities.
Recommended Valve Type
Flanged Resilient Seated Butterfly Valve
Recommended Actuator
Electric On/Off or Manual Gearbox
Material Configuration
- Body: WCB / GGG50 (Internal/External FBE Coating)
- Disc: A351 CF8 (304 SS)
- Stem: SS420 / SS316
- Seat: EPDM
Selection Reasoning
- Structural Stability: For large pipelines, flanged connections provide superior installation rigidity and sealing reliability compared to wafer types.
- Economical & Durable: The "FBE-coated ductile iron body + stainless steel disc" is the classic, proven, and most cost-effective configuration for raw/fresh water applications. The disc rotation provides a self-cleaning effect on the seat.
Flue Gas Treatment
Application Area
Flue Gas Damper
Media & Operating Conditions
- Media: Boiler Flue Gas (SOx, NOx, dust)
- Size: >DN1000 (often rectangular)
- Temp: 120°C ~ 200°C
Selection Challenge
- Structural rigidity for very large sizes to prevent distortion.
- High temperature and dust erosion on seals and bearings.
- Low leakage rate is critical for SCR/FGD efficiency.
Recommended Valve Type
ZZJG series Triple Offset Damper
Recommended Actuator
Electric Actuator (with linkage assembly)
Material Configuration
- Body: Carbon Steel Q235B / A36
- Disc: Carbon Steel (with stiffeners)
- Stem: SS410 / SS316
- Seat: Multi-layer stainless steel metal seal
Selection Reasoning
- Superior Sealing: Compared to traditional louver dampers, our Triple Offset design can achieve leakage rates below 0.5%, significantly improving flue gas treatment efficiency and meeting strict environmental standards.
- Structural Advantage: By adapting mature TOV technology, we provide a structurally stable, low-torque, and reliable sealing solution for even the largest ducts.
Product Link
View ProductHydro Power Plant
Application Area
Penstock / Turbine Inlet Isolation
Media & Operating Conditions
- Media: Clean Water
- Pressure: High, up to PN40
- Size: Large Diameter (DN800+)
Selection Challenge
- High static pressure and dynamic torque.
- Absolute reliability for turbine protection (emergency shutoff).
- Long-term sealing integrity after years of static open position.
Recommended Valve Type
ZZJG series Triple Offset Double Flanged Valve
Recommended Actuator
Hydraulic Actuator with Counterweight for fail-safe closing
Material Configuration
- Body: A216 WCB / A516 Gr.70 Fabricated
- Disc: A351 CF8M
- Stem: 17-4PH / 2205
- Seat: Laminated SS316+Graphite
Selection Reasoning
- High Pressure & Bi-directional Seal: The metal-seated TOV is designed for high-pressure, bi-directional, zero-leakage service, essential for main inlet safety.
- Friction-Free Operation: The camming action prevents rubbing between the seat and seal, ensuring low operating torque and reliable sealing even after long periods of inactivity. A counterweight hydraulic system provides the most reliable fail-safe emergency closure.
ZZJG SOURCE FACTORY
We are not just a supplier, we are your manufacturing partner. Our integrated capabilities provide unmatched quality control, flexibility, and value.
Source Factory · Flexible Customization
As a source factory, ZZJG delivers premium valves directly to you, offering flexible designs to meet all your industrial needs.
Integrated Casting · Superior Performance
ZZJG valves combine state-of-the-art integrated casting with rigorous quality control to provide high-performance, reliable valves for every project.
API Certified, Guaranteed Reliability
ZZJG’s API-certified valves deliver superior safety, compliance, and operational excellence—direct from our factory to your project.
From Raw Material to Finished Product
1. Raw Material Inspection
2. In-House Foundry Casting
3. Precision CNC Machining
4. Fusion Bonded Epoxy Coating
5. Assembly & Pressure Testing
6. Final Product Ready for ShipmentField-proven Engineering
The Challenge & Goal
- Challenge: Main Natural Gas Fuel Supply Line for a CCGT plant (PN63).
- Impact: The existing soft-seated ball valves showed passing/leakage after 18 months of service, leading to efficiency losses and safety concerns during turbine shutdown.
- Goal: Implement a Class VI / Rate A zero-leakage isolation valve with certified ESD (Emergency Shutdown) capability and a 10-year service life target.
Our Solution & Result
- Action: ZZJG Triple Offset Butterfly Valve (DN300, PN63).
- Mechanism: WCB Body, CF8M Disc, 17-4PH Stem, and Laminated Metal Seat (SS316+Graphite). Equipped with a spring-return pneumatic actuator for fail-close operation.
- Result: The valve has provided 4+ years of consistent, bubble-tight zero leakage. ESD tests are performed quarterly with perfect results. The plant has standardized on our TOV for all critical gas isolation duties.
"Switching to the ZZJG Triple Offset Valve on our main gas line eliminated our persistent leakage problems. We now have absolute confidence in our shutdown and isolation procedures."
— Chief Engineer, Major CCGT Power Plant
API 609
BV
ISO 9001
CE/PED
DNV
ZZJG Butterfly Valves
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