Patent Info Patent Name: A New Fully Sealed Butterfly Valve Grant Publication No.: CN224315503U Application Date: July 1, 2025 Grant Date: June 2, 2026 Patent Holder: Henan Gaoshan Valve Co., Ltd.
1. Butterfly Valve Seal Failure — The Hidden Cost That Hurts the Most
Butterfly valves are widely used across oil & gas, chemical processing, district heating, and water supply pipelines — compact structure, low flow resistance, fast opening and closing. But procurement and maintenance teams know the reality: once the media contains particulates, temperature and pressure fluctuate, or the application requires frequent flow reversal, traditional single-stage sealed butterfly valves start showing their limits:
- In high-pressure differential conditions, the disc-to-seat contact grows uneven, causing internal leakage;
- In bidirectional flow, the sealing surface bears pressure from only one direction, weakening reverse-pressure capability;
- Without a compensation mechanism, long-term seat wear progressively loosens the seal, forcing shorter maintenance intervals.
What looks like a “minor drip” accumulates into unplanned shutdowns, media loss, environmental fines, and safety incidents. For overseas project procurement, it also means expensive post-sale response times and unpredictable spare parts lead times — which is why engineers increasingly specify double eccentric or triple eccentric butterfly valves with multi-stage sealing for critical service.
2. Gaoshan’s New Patent: Double-Stage Sealing + Automatic Compensation
China’s National Intellectual Property Administration (CNIPA) recently published the grant of utility model patent “A New Fully Sealed Butterfly Valve” (CN224315503U) to Henan Gaoshan Valve Co., Ltd. The patent doesn’t rely on complex geometry — it tackles three real-world pain points — high pressure differential, bidirectional flow, and long-term wear — with two targeted improvements:
2.1 Double-Stage Sealing Disc Assembly: Rigid Metal Seal + Elastic Lip Seal for Redundancy
Most conventional butterfly valves use a single-stage seal. Once the primary sealing surface is compromised, leakage is essentially unavoidable. The new patent adopts a combination of an outer metal sealing ring and an inner lip-type seal ring:
- Outer metal sealing ring: provides high-temperature and abrasion-resistant rigid sealing, ideal for high differential pressure and particulate-laden media;
- Inner lip-type seal ring: uses elastic deformation to create a secondary seal, automatically conforming to the sealing surface during pressure fluctuations and reducing micro-leakage risk.
This dual-stage “hard + soft” design maintains a more stable specific sealing pressure regardless of flow direction, notably improving reliability in bidirectional applications — a key advantage over standard centerline soft-seat butterfly valves typically limited to single-direction flow.
2.2 Floating Seat + Disc Spring Stack: Automatic Compensation After Wear
Sealing surface wear is the main bottleneck for butterfly valve service life. The new patent couples a floating valve seat with a disc spring stack: as the sealing surface gradually wears over extended use, the spring stack continuously supplies the right level of specific sealing pressure, delivering automatic sealing surface compensation.
For overseas users, this translates to longer maintenance-free operating windows, fewer on-site tear-downs, and less frequent spare parts replacement — directly lowering total cost of ownership (TCO).
2.3 Maintenance-Friendly Structural Design
The patent also specifies an integrated design combining a cylindrical valve body, flanged connection assembly, quick-release bonnet assembly, and valve stem assembly — all aimed at making installation and servicing more straightforward: flanged connections are compatible with common piping standards (ASME B16.5 / EN 1092), while the quick-release bonnet reduces the effort required to access the stem and actuator for maintenance.
3. What This Means for Overseas Buyers
If you’re an EPC contractor, equipment integrator, or end user evaluating Chinese butterfly valve suppliers, this patent sends three signals:
| Buyer Concern | Value Delivered by This Patent |
| Sealing reliability | Double-stage sealing covers high ΔP and bidirectional flow, reducing internal leakage risk |
| Service life | Automatic compensation slows seat wear, extending maintenance intervals |
| Operational cost | Quick-release design cuts on-site service time, lowering total lifecycle cost |
In other words, this is not just “another patent.” It reflects a supplier’s ongoing investment in sealing technology, material selection, and long-term reliability. For long-cycle, high-specification overseas projects, details like these carry more weight than price alone.
Related reading: Double Eccentric vs Triple Eccentric Butterfly Valve — How to Choose
4. About Gaoshan Valve: Five Decades of Manufacturing Foundation
Henan Gaoshan Valve Co., Ltd., originally Zhengzhou Gaoshan Plumbing Fittings Factory, was founded in 1975 — among the earliest manufacturers in China to receive valve production licenses. Key facts:
- Registered capital: RMB 100.6 million (~USD 14 million)
- Footprint: approximately 120,000 m², with 50,000 m² of built-up area
- Workforce: ~580 employees, including 8 senior engineers and 20 engineers
- Production range: diameters DN15 through DN3200; pressure ratings 0.6 MPa to 10.0 MPa
- Product lines: 15+ series — gate, globe, butterfly, ball, safety, pressure-reducing, steam trap, and gas valves
- Certifications: ISO 9001, API (American Petroleum Institute), CE (European Union), China Special Equipment Manufacturing License, ISO 14001, OHSAS
- Export markets: United States, Canada, South Korea, Ecuador, and more
- Reference projects: Shengli Oilfield, Northwest Oilfield, Yulin Coal Chemical, Taiyuan District Heating, Zhengzhou District Heating, Zhengzhou Xinzheng International Airport
For international procurement teams, this track record means: the factory can deliver against international standards at scale, provide full documentation packages, and offer dependable after-sales support.
5. Target Applications
Drawing from the patent abstract’s mention of “oil & gas, chemical, and other severe-service conditions,” this fully sealed butterfly valve is particularly well-suited for:
- Oil & gas / petrochemical — shutoff and throttling of crude oil, refined products, and chemical media demanding near-zero leakage;
- District heating — hot water and steam pipelines with frequent pressure swings and bidirectional flow;
- Water treatment & supply — pumping stations and flow/pressure regulation where seal longevity is critical;
- Gas transmission & distribution — applications where a metal-to-metal seal is required to handle combustible media under varying temperature and pressure;
- Power generation & pulp & paper — high-temperature, particulate-laden, or corrosive media conditions.
6. Sourcing Checklist — What to Look for in a Fully Sealed Butterfly Valve
If you’re currently evaluating similar fully sealed butterfly valves for your project, here are five areas to verify:
- ☐ Single vs. multi-stage seal design — for high ΔP and bidirectional flow, always prefer double-stage or multi-stage sealing;
- ☐ Presence of a wear-compensation mechanism — floating seats and spring compensation can significantly extend service life;
- ☐ Material compatibility — body, disc, and seal ring materials must match your media, temperature, and pressure envelope;
- ☐ Certification package completeness — API, CE, ISO, material certificates, and test reports are non-negotiable for export projects;
- ☐ Supplier project experience — real-world installation references under similar operating conditions speak louder than datasheets.
7. Frequently Asked Questions
Q1: What is a fully sealed butterfly valve?
A fully sealed butterfly valve achieves a tight, leak-proof closure between the disc and the seat, minimizing both internal and external leakage. It’s typically specified for oil & gas, chemical processing, district heating, and gas applications where sealing performance is critical. Unlike standard wafer butterfly valves, fully sealed designs incorporate redundant sealing stages for high-integrity service.
Q2: How does double-stage sealing differ from traditional single-stage sealing?
Traditional single-stage sealing relies on one sealing surface. Double-stage sealing combines a metal sealing ring and an elastic lip seal ring — even if the outer sealing surface experiences minor wear, the inner seal ring provides secondary protection, making it far more suitable for high ΔP and bidirectional flow.
Q3: What does the automatic compensation feature do?
The automatic compensation mechanism uses a spring stack to continuously supply the correct specific sealing pressure as the sealing surface wears over time. This prevents the valve from gradually loosening and extends maintenance intervals — a feature not found in conventional butterfly valves.
Q4: Do Gaoshan Valve’s certifications meet international project requirements?
Yes. Gaoshan Valve holds ISO 9001, API, CE, China Special Equipment Manufacturing License, and additional management system certifications. Products are already exported to the United States, Canada, South Korea, Ecuador, and other markets — fully equipped to support international projects. View quality certifications →
Q5: How can I get detailed parameters and pricing for this patented butterfly valve?
Visit our butterfly valve product page or contact us directly. Provide the required diameter, pressure rating, media type, operating temperature, and actuator preferences, and we will match you with the right fully sealed butterfly valve configuration — including pneumatic, electric, or manual operation.
8. Explore Our Butterfly Valve Range
The fully sealed butterfly valve covered by this patent is part of a broader lineup built on 50 years of manufacturing experience. Browse the full collection — including centerline, double-offset, triple-offset, and fully sealed configurations:
→ Browse All Butterfly Valves
Need a specific size, pressure rating, or material? Oil refinery turnaround, district heating expansion, or chemical plant upgrade — we match the right valve to your operating conditions. Datasheets, pricing, and lead times available on request.