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Help CenterGB/T1855 Cast Iron Stop Check Valve With Mill Test Report, Standard DN50 to DN200 Sizes
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As a leading manufacturer with ISO9001 certification, Shanghai Zhibang Valve Manufacture Co., Ltd. specializes in delivering high-quality industrial valves directly from our factory. Established in 2016, we have built a strong reputation by exporting our reliable valve solutions to over a dozen global markets, including North America, Europe, and Southeast Asia. Our GB/T 1855 Cast Iron Stop Check Valve embodies our commitment to durability, performance, and complete traceability, providing a critical safeguard for your pipeline systems.
This valve is engineered to perform two essential functions: it acts as a reliable check valve to prevent backflow, and it incorporates a positive shut-off (stop) feature, allowing manual isolation of the line. Constructed from robust cast iron, it is designed for long service life in demanding applications involving water, oil, and gas. Each valve is supplied with a Mill Test Report (MTR), offering full material traceability and peace of mind for quality-critical projects.
Key Features & Technical Advantages:
- Dual-Function Design: Combines non-return and isolation capabilities in a single unit, saving space and installation cost.
- Robust Cast Iron Construction: Provides excellent corrosion resistance and mechanical strength for a wide range of media.
- Full Traceability: Each valve is accompanied by a Mill Test Report certifying the material's chemical composition and mechanical properties.
- Standard Compliance: Manufactured in strict accordance with the Chinese national standard GB/T 1855, ensuring dimensional interchangeability and performance reliability.
- Wide Size Range: Available in standard sizes from DN50 to DN200, catering to various pipeline requirements.
- Flanged Ends: Facilitates easy and secure bolted connection to existing piping systems.
Technical Specifications:
| Parameter | Specification |
|---|---|
| Product Standard | GB/T 1855 |
| Body Material | Cast Iron |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200 |
| Pressure Rating | PN16 / PN25 (Common) |
| Connection Type | Flanged (RF Face) |
| Operation | Manual Handwheel |
| Temperature Range | Up to 120°C (Dependent on media & seal) |
| Seat Material | Cast Iron / Optional Rubber or Metal Seats |
| Suitable Media | Water, Oil, Gas, Steam (Non-aggressive) |
Benefits for Your Operation:
- Enhanced System Safety: Prevents potentially damaging reverse flow and allows for safe maintenance isolation.
- Reduced Inventory & Cost: Eliminates the need for separate check and gate valves, lowering initial purchase and installation expenses.
- Quality Assurance: The provided MTR supports compliance with engineering standards and simplifies quality audits.
- Global Compatibility: Our extensive export experience to diverse markets ensures the product meets international installation and performance expectations.
- Reliable Supply: As the direct manufacturer, we offer stable supply and competitive pricing, with shipment options from major Chinese ports like Shanghai and Guangzhou.
Trust in a product backed by a manufacturer with a proven track record. Since 2016, Shanghai Zhibang has consistently delivered over US$1 million in annual export value, serving clients across continents from North America to Oceania. Our ISO9001 certified production process guarantees that every GB/T 1855 Cast Iron Stop Check Valve meets stringent quality controls. Combine the valve's inherent durability with our reliable supply chain and comprehensive documentation, and you have a component that strengthens both your pipeline integrity and your project's compliance. Contact us today to discuss your sizing requirements or to request a quotation for a reliable valve solution supported by full material traceability.
Frequently Asked Questions (FAQ):
-
Q: What is the main difference between a standard check valve and this stop check valve?
A: A standard check valve only prevents backflow automatically. This stop check valve adds a manual handwheel operation that allows you to positively close the valve, completely stopping flow in either direction for isolation or maintenance purposes. -
Q: Is the Mill Test Report (MTR) provided for every valve?
A: Yes. A Mill Test Report detailing the chemical and mechanical properties of the cast iron material is provided as standard with each valve, ensuring full traceability. -
Q: What pressure classes are available for these valves?
A: The valves are commonly supplied in PN16 and PN25 pressure ratings. Other pressure classes may be available upon request for customized orders. -
Q: Can this valve be used with steam service?
A: It can be used for low-pressure steam applications within its specified temperature and pressure limits. The specific seat material should be confirmed based on the actual steam conditions. -
Q: Are the flanges drilled according to any specific standard?
A: The flanges are typically manufactured to common international dimensions (e.g., ISO, ANSI) for compatibility. The exact flange standard (like GB, JIS, ANSI) can be specified at the time of order. -
Q: Do you offer certifications like CE or API for this valve?
A: Our manufacturing facility is ISO9001 certified. Specific product certifications like CE or API are optional and can be discussed based on project requirements and order volume. -
Q: What is the lead time for standard DN50 to DN200 sizes?
A: For standard sizes and materials, we generally maintain stock or offer short production lead times. The exact delivery time can be confirmed upon order inquiry. -
Q: What are the packaging and shipping terms?
A: Valves are securely packed in wooden cases for export. We ship from major ports including Shanghai, Guangzhou, and Hong Kong, and can arrange delivery under standard international trade terms like FOB, CIF, or CFR.
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