Premium Expansion Joints & Valves
Manufacturing Excellence Since 1989
The earliest R&D patents for duckbill check valve in China.
Trusted by core valued clients for over 20 years.
≥ 52%
10+ Year Clients
Long-term trusted partnerships
≥ 68%
5+ Year Clients
Strong business relationships
≈ 30%
New Clients
Growing global reach
≥ 95%
B2B Clients
Professional partnerships
We are committed to permanenting and maintaining long-term mutually beneficial cooperation.
Products
Industry Applications
Our specialized products serve critical infrastructure projects across multiple sectors:
- Wastewater/Stormwater Treatment & Discharge
- Marine & Coastal Protection Systems
- Flood & Tidal Control Infrastructure
- Thermal Power Plant Cooling Towers
- Industrial & Municipal Piping Systems
What We Value Most
Core principles that guide our business excellence
Quality
- • ISO & CE Certified
- • Quality Control Processes
- • Technology Improvement Initiatives
Long-term Partnership
- • Honesty & Trustworthiness
- • Decade-long Client Relationships
- • Mutually Beneficial Business Terms
AI Service
- • You State Requirements
- • We Handle All the Rest
- • Satisfaction Guaranteed
Warranty
- • Free Replacement for Quality Issues
- • 12 Months Warranty Period
- • IOM Instruction
Experience Our Top Solutions
Discover our most popular products engineered for superior performance and reliability
Duckbill Check Valves
Best SellerOur boss's father was the first person in China to introduce duckbill check valve technology, and he obtained patents for the development of duck bill valves and curved-bill duckbill check valves.
Rubber Expansion Joints
PremiumMade with our unique formula refined through years of practice, providing textured feel and stronger elastomer performance. Available in standard and threaded union designs.
Our Production Process
Precision engineering and quality control at every step
Rubber Refining
Our patented rubber refining process creates a unique formula that provides stronger elastomer performance and improved durability
Rubber Sheet Making
Precision engineering ensures consistent thickness and quality through our mechanized production lines
Winding Molding
Our specialized winding techniques create uniform products with exceptional structural integrity on our 5 production lines
High Temperature Vulcanization
Precise temperature-controlled vulcanization ensures optimal material properties and longevity
Quality Testing & Certification
Rigorous inspection and testing ensures all products meet our ISO 9001-2000 certification standards and international requirements [3]
Production Capacity
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5 Production Lines
Operating with standardized procedures
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Mechanized Production
High yield rate with improved daily capacity
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Large Inventory
Short delivery times for standard products
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Sufficient Mould Reserve
New moulds can be added at any time
Quality Control
Our commitment to quality is evidenced by our ISO 9001-2000 certification, ensuring every product meets rigorous international standards
Inspection Rate
Every product undergoes thorough testing
Countries Served
Global distribution with satisfied customers
Years of Loyalty
Long-term partnerships with many customers
Send Us a Message
Get custom valve solutions from our expert team
International Standards & Recognition
ISO Certificate
CE Certification
EAC Certification
R&D Patents
Our Patented Technologies
GYLDT has obtained multiple R&D patents for innovative product designs that enhance performance and reliability in critical applications
Quality Assurance
Certified processes
Regulatory Compliance
International standards
Market Access
Global trade readiness
Trusted Brand
Customer loyalty for over 10 years
Trusted Worldwide
Delivering quality products to over 46 countries across six continents
America
Countries
Europe
Countries
Asia
Countries
Australia
Countries
Middle East
Countries
Long-term Cooperation
Several customers have partnered with us for over a decade, trusting our consistent quality and service
About Us
GYLDT CO., LIMITED
Founded in 1989, GYLDT specializes in duckbill check valves, rubber expansion joints, and flap gate valves.
ISO9001-2000 certified with CE and EAC certificates, serving customers across six continents.
Products used in wastewater treatment, marine protection, and industrial piping systems.