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Help CenterGB/T1855 Compliant Stop Check Valve For Seawater Desalination And Cooling Systems
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As a specialized manufacturer of industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our GB/T1855 Compliant Stop Check Valve, engineered specifically for demanding applications in seawater desalination and industrial cooling systems. Since our establishment in 2016, we have focused on delivering robust, reliable fluid control solutions that meet stringent industry standards. This valve combines the critical functions of a stop valve and a check valve, offering superior flow control and backflow prevention in corrosive and high-pressure environments, ensuring system integrity and operational safety.
Our valve is designed to address the unique challenges posed by seawater and cooling media. It prevents reverse flow when upstream pressure drops, safeguarding pumps and other sensitive equipment, while also allowing positive shut-off when required. Manufactured under our ISO9001 certified quality management system, this product represents our commitment to precision engineering and consistent performance, making it a trusted component for global projects from North America to Southeast Asia.
Core Features & Technical Advantages:
- Dual-Function Design: Integrates a non-return (check) function and a positive isolation (stop) function into a single unit, simplifying piping layouts and reducing installation points.
- Corrosion-Resistant Construction: Primary materials include carbon steel with protective coatings or optional stainless steel grades (like 316L) for enhanced resistance to chloride attack in seawater applications.
- GB/T1855 Compliance: Manufactured to conform with the Chinese national standard GB/T1855 for stop-check valves, ensuring dimensional accuracy, pressure ratings, and performance benchmarks suitable for industrial use.
- Robust Sealing Mechanism: Utilizes a metal-to-metal seat for durable, high-temperature service, with optional resilient seals (e.g., EPDM) available for specific media compatibility requirements.
- Precision Flow Control: The valve design minimizes turbulence and pressure drop, contributing to energy efficiency in cooling and desalination circuits.
- Safe & Reliable Operation: Features a clear open/closed position indicator. An optional lockable handle or gear operation assembly is available for larger sizes or automated system integration.
Detailed Technical Specifications:
| Parameter | Specification / Range |
| Standard | GB/T1855 |
| Nominal Diameter (DN) | DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN300 |
| Pressure Rating (PN) | PN10, PN16, PN25 |
| Connection Type | Flanged (RF face), as per GB/T standard |
| Body Material | Carbon Steel (WCB), Stainless Steel (CF8/CF8M optional) |
| Seat/Disc Material | Stainless Steel, with optional hardened surfaces or resilient seals |
| Operating Temperature | -20°C to +150°C |
| Operation Mode | Manual Handwheel (standard), Gear Operator (optional for DN≥200) |
| Test Standards | Shell Test & Seat Test per GB/T standard requirements |
Benefits for Your System:
- System Protection: Automatically prevents damaging backflow to pumps and heat exchangers in cooling and desalination systems, reducing maintenance costs and downtime.
- Space & Cost Efficiency: Replaces the need for separate check and isolation valves, saving on pipe fittings, installation space, and overall project material costs.
- Long Service Life: Corrosion-resistant materials and robust design ensure reliable performance in aggressive seawater and cooling water environments, extending asset lifecycle.
- Operational Flexibility: Provides positive manual shut-off for maintenance or system isolation while maintaining automatic check functionality during normal operation.
- Global Supply Reliability: Supported by our ISO9001 certified manufacturing processes and export capability from major Chinese ports like Shanghai and Guangzhou, ensuring consistent quality and timely delivery to markets worldwide.
Trust & Performance Backed by Experience:
Shanghai Zhibang Valve Manufacture Co., Ltd. has built a solid reputation since 2016, supported by an annual export value reflecting steady growth and client trust. Our ISO9001 certification underpins every valve we produce, guaranteeing systematic quality control from raw material inspection to final testing. This GB/T1855 Compliant Stop Check Valve is a proven solution supplied to diverse markets including North America, Eastern Europe, Southeast Asia, and the Middle East for critical seawater desalination and cooling projects. We offer comprehensive support and customization to meet your specific pressure, size, or material requirements. Contact us today to discuss how this reliable valve can enhance the safety and efficiency of your fluid systems.
Frequently Asked Questions (FAQ):
-
Q: What is the primary advantage of using a stop check valve over separate check and stop valves?
A: It combines two functions into one unit, reducing the number of components, installation points, potential leak paths, and overall system cost and footprint. -
Q: Is this valve suitable for seawater with high chloride content?
A: Yes. The standard carbon steel construction includes protective coatings. For highly corrosive conditions, we recommend optional stainless steel (e.g., 316L) body and internals, which can be specified upon request. -
Q: How does the check function work? Does it require external power?
A: The check function is entirely mechanical and passive. A spring or weighted mechanism allows the disc to close automatically if upstream pressure falls, preventing reverse flow. No external power or signal is needed. -
Q: Can this valve be used in high-temperature cooling systems?
A: The standard design accommodates temperatures up to 150°C. For higher temperatures, material selections and design adjustments can be customized based on your specific parameters. -
Q: What is the delivery lead time for standard sizes?
A> For standard DN sizes and pressure ratings, typical lead time is 4-6 weeks after order confirmation. We ship from Shanghai, Guangzhou, Hong Kong, or Beijing ports for efficient logistics. -
Q: Are testing certificates provided with the valve?
A> Yes. Each valve undergoes shell and seat pressure tests per GB/T standards. A standard test report can be provided. More detailed certification is available upon request. -
Q: Can the valve be operated remotely or integrated into an automated system?
A> The standard model is manually operated. For automation, an optional gear operator can be fitted, which can then be coupled with an electric or pneumatic actuator. This is a customizable feature. -
Q: Does Zhibang provide technical support for installation and maintenance?
A> Absolutely. As a manufacturer, we provide detailed installation manuals, dimensional drawings, and material specifications. We also offer after-sales support for operational queries.
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