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Shanghai Zhibang Valve Manufacture Co., Ltd., a professional manufacturer established in 2016 with ISO9001 certification and an annual export value of US$1–1.5 million, is proud to introduce the Double Sealing Design GB/T12465-2007 Expansion Joint Leak Proof. This product is engineered to provide exceptional reliability in pipeline systems, effectively absorbing thermal expansion, vibration, and misalignment while preventing any leakage. Backed by our rigorous quality control and extensive export experience to markets across North America, Europe, Asia, and Africa, our expansion joint is the ideal solution for demanding industrial applications.
Product Overview
The Double Sealing Design Expansion Joint strictly follows the Chinese national standard GB/T12465-2007, ensuring dimensional accuracy and performance consistency. It incorporates a unique double sealing structure that significantly enhances leak-proof capability compared to conventional single-seal designs. The joint is available in various materials, sizes, and pressure ratings to suit diverse operating conditions.
| Parameter | Specification |
| Design Standard | GB/T12465-2007 |
| Sealing Type | Double Sealing (Primary + Secondary) |
| Nominal Diameter (DN) | 50 – 2000 mm |
| Pressure Rating (PN) | 6, 10, 16, 25 bar |
| Working Temperature | -40°C to +150°C |
| Connection | Flanged (ANSI/DIN/JIS options available) |
| Body Material | Carbon Steel (Q235B, 20#) or Stainless Steel (304, 316L) |
| Bellows Material | Stainless Steel 304/316L |
Key Features & Benefits
- Double Sealing Design: The primary seal (bellows) handles the main expansion, while the secondary seal provides an extra layer of protection, ensuring zero leakage even under extreme pressure or temperature fluctuations.
- GB/T12465-2007 Compliance: Manufactured strictly according to this national standard, guaranteeing interchangeability, dimensional accuracy, and reliable performance.
- Leak-Proof Performance: The dual-seal configuration eliminates the risk of media leakage, making it ideal for critical applications such as water, steam, oil, gas, and chemical pipelines.
- Durable Construction: High-quality stainless steel bellows and robust carbon steel flanges are resistant to corrosion, fatigue, and high-temperature oxidation.
- Easy Installation: Flanged connections allow quick and secure alignment with pipeline systems, reducing installation time and labor costs.
- Customizable Options: Available in various sizes, pressure ratings, materials, and colors (custom RAL codes) to meet specific project requirements.
- Flexible Axial, Lateral & Angular Movement: Designed to absorb thermal expansion, vibration, and pipe misalignment, extending the life of the entire pipeline system.
Why Choose Shanghai Zhibang Valve Manufacture Co., Ltd.?
As a dedicated manufacturer with ISO9001 certification, we have been delivering high-quality valve and piping products since 2016. Our annual export value exceeds US$1 million, serving customers in North America, South America, Europe, Southeast Asia, Africa, Oceania, the Middle East, and domestic markets. We ship from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring timely delivery worldwide. Every expansion joint undergoes rigorous testing, including hydrostatic pressure tests and leak detection, to ensure it meets the highest industry standards.
Frequently Asked Questions (FAQ)
Q1: What is the difference between a single seal and double seal expansion joint?
A: A single seal relies on one bellows or gasket, while a double seal adds a secondary barrier. In case the primary seal fails, the secondary seal prevents leakage, providing enhanced safety and reliability.
Q2: Can this expansion joint be used for high-temperature steam?
A: Yes, the working temperature range is -40°C to +150°C. For temperatures above 150°C, please consult our engineering team for customized solutions.
Q3: What materials are available for the bellows?
A: Standard material is stainless steel 304 or 316L. For corrosive environments, we recommend 316L or other alloys upon request.
Q4: Does the product come with a pressure test certificate?
A: Yes, each unit is hydrostatically tested and a test certificate is provided. Additional third-party inspection is available upon request.
Q5: What is the minimum order quantity (MOQ)?
A: MOQ is 1 piece for standard sizes. For custom sizes or special materials, MOQ may be 5–10 pieces. Please contact us for details.
Q6: Can you provide custom flange drilling (ANSI, DIN, JIS)?
A: Yes, we offer flanges according to ANSI B16.5, DIN 2501, JIS B2220, and other standards.
Q7: How long is the warranty period?
A: Standard warranty is 12 months from the date of shipment. Extended warranty options are available for an additional cost.
Q8: What is the typical lead time?
A: For standard sizes, lead time is 7–15 days. For bulk orders or customizations, 20–30 days depending on complexity.
Contact us today to discuss your project requirements and receive a competitive quotation. Shanghai Zhibang Valve Manufacture Co., Ltd. is your trusted partner for reliable, leak-proof expansion joints.
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