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Help CenterCast Iron Stop Check Valve Supplied With Full Technical Documentation and Mill Test Report
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As a leading manufacturer since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd is proud to present our Cast Iron Stop Check Valve, a robust and reliable solution designed for demanding industrial applications. This valve combines the functions of a stop valve and a check valve, offering precise flow control and automatic backflow prevention in a single, compact unit. Every valve is supplied with full technical documentation and a Mill Test Report (MTR), ensuring full traceability and compliance with international standards. With an annual export value of US$1-1.5 million and shipments to over 15 global markets, our cast iron stop check valves are trusted by engineers and procurement professionals worldwide for their durability, performance, and comprehensive quality assurance.
Our stop check valve is engineered to meet the rigorous demands of water, steam, oil, and gas systems. The cast iron body provides excellent strength and corrosion resistance at a cost-effective price point, while the internal trim materials (such as stainless steel or bronze) are selected for long service life. The valve features a guided disc that automatically closes when flow reverses, preventing water hammer and protecting downstream equipment. Additionally, the manual override function allows operators to shut off flow completely, making it ideal for pump protection, boiler systems, and pipeline isolation. Each valve undergoes rigorous testing in our Shanghai facility, including hydrostatic shell and seat tests, with results documented in the accompanying Mill Test Report.
Key Features and Technical Specifications:
- Dual Functionality: Combines stop valve and check valve functions in one body, reducing installation space and piping complexity.
- Cast Iron Construction: High-quality gray or ductile iron body (GG25/GGG40) offers excellent durability and resistance to thermal stress.
- Flanged Ends: Available in DIN, ANSI, or BS flanges for easy integration into existing pipeline systems.
- Pressure Ratings: PN10, PN16, and PN25 (or Class 150/300) to suit various system pressures.
- Temperature Range: Suitable for operating temperatures from -10°C to 300°C, depending on seat material.
- Manual Override: Equipped with a handwheel or lever for manual closing, allowing positive shut-off when needed.
- Full Documentation: Each valve comes with a complete technical dossier, including dimensional drawings, material certificates, and test reports.
- Mill Test Report (MTR): Provides certified chemical and mechanical properties of the cast iron body, ensuring material quality and traceability.
| Parameter | Specification |
|---|---|
| Size Range | DN50 – DN600 (2" – 24") |
| Body Material | Cast Iron (GG25, GGG40) or Ductile Iron |
| Disc Material | Stainless Steel (SS304/SS316) or Bronze |
| Seat Material | EPDM, NBR, or PTFE (optional) |
| Pressure Rating | PN10 / PN16 / PN25 (Class 150 / 300) |
| End Connection | Flanged (DIN2501, ANSI B16.5, BS4504) |
| Operation | Manual (handwheel or lever) |
| Test Pressure (Shell) | 1.5 x PN (e.g., 24 bar for PN16) |
| Test Pressure (Seat) | 1.1 x PN |
| Compliance | DIN3352, BS5163, API6D (applicable) |
Customer Benefits:
- Cost Savings: Eliminates the need for separate stop and check valves, reducing procurement, installation, and maintenance costs.
- Enhanced Safety: Automatic backflow prevention protects pumps, compressors, and pipelines from damage due to reverse flow.
- Reliable Operation: Guided disc design ensures smooth, chatter-free operation even under fluctuating flow conditions.
- Easy Maintenance: Bonnet design allows quick access to internal components for inspection or replacement without removing the valve from the line.
- Full Traceability: Mill Test Report and technical documentation provide complete material and performance data, essential for quality audits and project compliance.
- Global Compatibility: Flanged ends available in multiple standards (DIN, ANSI, BS) to match piping systems worldwide.
At Shanghai Zhibang Valve Manufacture Co., Ltd, quality is not just a promise—it's a process. Our ISO9001-certified facility ensures that every cast iron stop check valve is manufactured under strict quality control procedures. With an annual export value of US$1-1.5 million, we have successfully supplied valves to clients in North America, South America, Europe, Africa, Oceania, the Middle East, and Asia. Our valves are shipped from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring timely delivery to any destination. We stand behind our products with comprehensive technical support and a commitment to customer satisfaction. Contact us today to request a quote or discuss your specific requirements—our team is ready to provide the perfect valve solution for your application.
Frequently Asked Questions (FAQ):
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Q: What is the difference between a stop check valve and a regular check valve?
A: A stop check valve combines the functions of a stop valve (manual shut-off) and a check valve (automatic backflow prevention). Unlike a regular check valve, it can be manually closed to stop flow completely, providing additional control and safety. -
Q: Is the Mill Test Report (MTR) included with every valve?
A: Yes, every cast iron stop check valve is supplied with a full Mill Test Report that certifies the chemical composition and mechanical properties of the cast iron body, ensuring material traceability and quality. -
Q: What pressure ratings are available?
A: We offer PN10, PN16, and PN25 ratings (equivalent to Class 150 and Class 300). Custom pressure ratings are available upon request. -
Q: Can the valve be used for steam applications?
A: Yes, depending on the seat material. For steam, we recommend EPDM or PTFE seats, which can handle temperatures up to 300°C. Please specify your application when ordering. -
Q: What flange standards do you support?
A: We support DIN (DIN2501), ANSI (B16.5), and BS (BS4504) flanges. Other standards are available upon request. -
Q: How is the valve tested before shipment?
A: Each valve undergoes hydrostatic shell and seat tests at 1.5x and 1.1x the rated pressure, respectively. Test results are recorded in the Mill Test Report. -
Q: What is the typical lead time for an order?
A: Lead time depends on quantity and specifications, but standard sizes (DN50-DN300) typically ship within 15-30 days from our Shanghai factory. Custom orders may require longer. -
Q: Do you provide technical documentation in English?
A: Yes, all technical documentation, including dimensional drawings, material certificates, and test reports, are provided in English. Other languages are available upon request.
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