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Company Profile

Jiangsu Junlong Machinery Co., Ltd.

Jiangsu Junlong Machinery Co., Ltd. has been dedicated to the independent R&D, design and manufacturing of precision metal bellows since its establishment. Through nearly two decades of development, the company has built a product portfolio covering nearly 10,000 specifications across four major categories: valve bellows, sealing bellows, sensing and elastic element bellows, and welded metal bellows.

We remain committed to independent manufacturing and operate a complete production base covering core processes through final assembly. More than 90% of key processes are completed in-house, enabling lean control over every stage from raw materials to finished products and ensuring consistent product quality and reliability.

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Founded
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Quality Management & Product Certifications
ISO9001 / 14001 / 45001
Employees
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R&D Professionals
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Customers Served
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Core Manufacturing Process

Junlong Machinery

We understand that metal bellows for valves must ensure long-term external sealing performance under extreme and demanding operating conditions. At the same time, they must also support flexible valve opening and closing. Therefore, all of our technology and process development is closely centered on real valve operating conditions such as high temperature, high pressure and frequent cycling. We are committed to providing valve manufacturers with bellows solutions that offer better matching performance and stronger durability.

To meet the special requirements of valve bellows, we have developed and validated a set of proprietary and reliable core manufacturing technologies based on nearly two decades of processing experience and test data for thin-wall bellows.

Ensuring structural integrity and dimensional precision of ultra-thin metal walls during welding and forming, laying the foundation for high flexibility and large compensation capacity.

Through specialized multi-layer structures and bellows forming processes, we significantly improve pressure resistance and compensation performance within limited installation space, meeting high-pressure and large-deformation requirements.

Based on different valve operating conditions, including pressure, temperature, cycle frequency and other parameters, we carry out targeted corrugation profile, material and structural optimization design, significantly extending service life under complex stress conditions.

With two decades of deep industry experience, we have not only established a metal bellows application database, but also accumulated extensive engineering experience in valve bellows applications.

  • Providing standard product series and non-standard customization services
  • Supporting applications such as gate valves, control valves and safety valves
  • Helping customers overcome challenges in dynamic sealing, thermal stress compensation and long-term maintenance-free operation

Junlong Machinery always upholds a professional, pragmatic and collaborative philosophy, with a craftsman spirit that values precision and attention to detail. We are more than a bellows supplier; we aim to be your trusted long-term partner.

Junlong Corporate Culture

Building strength through professionalism, connecting with customers through integrity, and driving steady growth through long-term commitment.

Our Mission

Create value with dedication, serve customers with dedication, and give back to society with dedication.

Our Vision

To become an outstanding enterprise with strong reputation, solid capability and human warmth, steadily advancing and growing in the high-end valve bellows field.

Our Core Principles

Integrity as the Foundation: Build the company on honesty, take responsibility for quality, and honor every commitment.

Innovation as the Driver: Take innovation as the core, continuously overcome process challenges, and drive technological advancement.

Professionalism as the Strength: Grow through expertise, focusing on one field for over twenty years to achieve depth and excellence.

Cooperation for Shared Success: Create long-term value together with customers, partners and employees through win-win collaboration.

The Spirit We Uphold

United in purpose, committed to excellence, and practicing long-termism through continuous improvement.

Our Business Philosophy

Win the market with excellent quality, retain customers with sincere service, and build the future through integrity and mutual success.

Our Talent Philosophy

Respect, cultivate and empower. We regard talent as our most valuable “bellows” — building resilience under pressure, transferring energy through collaboration, and creating extraordinary value through a shared mission.

Honors & Certifications

Certification

Company Honors

Service Support

With rapid response, technical assurance, warranty commitment and continuous improvement as our core principles, we have established a full-process after-sales service support system to help ensure stable operation of customer equipment.

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Service Response Time

We have established a dedicated after-sales service department with technical engineers and customer service specialists. We promise to respond within 2 hours and provide a solution within 24 hours. For situations requiring on-site support, we commit to arriving on site within 48 hours according to regional arrangements, ensuring timely troubleshooting and issue resolution.

Response
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Technical Assurance and Continuous Support

We have established a digital after-sales service management platform to ensure full-process service traceability. Regular technical upgrade training is organized, and our service team works closely with the R&D department to provide remote expert consultation support for complex technical issues. We also maintain regular follow-up and preventive maintenance mechanisms to proactively identify potential problems.

Support
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Warranty Commitment and Continuous Improvement

During the warranty period, leakage caused by manufacturing defects will be replaced free of charge. We regularly hold service quality analysis meetings, feeding service data back into R&D and production processes to drive continuous product quality improvement.

Quality