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Help CenterGB/T1855 Standard Stop Check Valve With Mill Test Report, Stainless Steel Body
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As a professional manufacturer of industrial valves, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our high-quality GB/T1855 Standard Stop Check Valve with Mill Test Report. Engineered with a durable stainless steel body, this valve is designed to offer reliable bidirectional flow control and backflow prevention in demanding pipeline applications. Since our establishment in 2016, we have focused on delivering precision-engineered fluid control solutions that meet stringent industry standards. This valve exemplifies our commitment to quality, providing a robust solution for systems where both isolation and check functions are critical, supported by full traceability through its accompanying Mill Test Report.
This Stop Check Valve combines the functions of a gate valve (for isolation) and a check valve (for backflow prevention) into a single, compact unit. Its design is particularly advantageous in systems requiring space optimization or where the prevention of reverse flow during shutdown is essential. The primary mechanism involves a disc or clapper that is free to move for check valve operation. When the handwheel or actuator is engaged to close the valve, the disc is mechanically seated, providing a positive shut-off similar to a gate valve. This dual functionality enhances system safety and simplifies piping layouts.
Key Features and Technical Advantages:
- Dual-Function Design: Serves as both a reliable isolation valve and an effective non-return check valve, reducing the need for multiple valve installations and saving on space and cost.
- Robust Stainless Steel Construction: The body and critical internal components are manufactured from selected grades of stainless steel, offering excellent resistance to corrosion, erosion, and high temperatures, ensuring a long service life even in harsh environments.
- Compliance with GB/T1855: Manufactured in strict accordance with the Chinese National Standard GB/T1855, which specifies requirements for check valves, ensuring dimensional interchangeability, pressure integrity, and performance reliability.
- Full Material Traceability: Each valve is supplied with a comprehensive Mill Test Report (MTR). This certificate provides verified chemical composition and mechanical properties of the materials used, offering quality assurance and facilitating compliance with project specifications.
- Flexible Configuration: Available in various pressure classes (e.g., PN10, PN16, PN25, PN40) and nominal sizes. Options include different end connections (flanged, butt-weld, socket-weld), seat materials, and operating mechanisms (manual handwheel, gear operator, or pneumatic/electric actuation).
- Precision Machining: Critical sealing surfaces are precision-machined and lapped to ensure tight shut-off in both the stop and check functions, minimizing internal leakage and pressure drop.
Typical Technical Specifications:
| Parameter | Description / Range |
| Design & Manufacturing Standard | GB/T1855 |
| Body Material | Stainless Steel (CF8/304, CF8M/316, etc.) |
| Disc/Clapper Material | Stainless Steel with optional hardened trim or seal |
| Pressure Rating (PN) | PN10, PN16, PN25, PN40, Class 150, Class 300 |
| Size Range (DN) | DN50 to DN600 (2" to 24") or as required |
| End Connection | Flanged (RF, FF), Butt Weld, Socket Weld |
| Temperature Range | -29°C to +425°C (depending on seat material) |
| Operation | Manual Handwheel, Gear Operator, Pneumatic/ Electric Actuator |
Benefits for Your Operations:
- Enhanced System Safety: Prevents potentially damaging reverse flow in pipelines for pumps, compressors, and steam lines, protecting expensive equipment.
- Space and Cost Savings: Eliminates the need for separate gate and check valve installations, reducing footprint, weight, and overall project cost.
- Reduced Maintenance: The robust stainless steel construction and precision engineering lead to lower wear rates and less frequent maintenance intervals.
- Procurement Simplicity: The inclusion of the Mill Test Report streamlines the material verification process for engineers, inspectors, and plant operators, ensuring compliance and speeding up installation.
- Versatile Application: Suitable for a wide range of industries including power generation (boiler feedwater, steam lines), oil & gas, chemical processing, water treatment, HVAC, and shipbuilding.
Backed by our ISO9001 certified quality management system, Shanghai Zhibang Valve ensures every GB/T1855 Stop Check Valve meets rigorous production and testing standards. Our annual export value of US$1-1.5 Million reflects the trust placed in us by a global clientele across North and South America, Europe, Asia, Africa, and Oceania. We offer flexible shipment from major ports including Shanghai, Guangzhou, Hong Kong, and Beijing. Choose our stainless steel stop check valve for a reliable, documented, and high-performance component that simplifies your piping design and enhances operational safety. Contact us today to discuss your specific requirements, request a detailed quotation, or obtain technical support for your next project.
Frequently Asked Questions (FAQ)
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Q: What is the primary difference between a standard check valve and this stop check valve?
A: A standard check valve only prevents backflow automatically. A stop check valve adds a manual (or actuated) override that allows an operator to mechanically force the disc closed, providing a positive isolation function even if forward flow pressure is present, or to hold it open if needed. -
Q: Can this valve be installed in any orientation?
A: Installation orientation is important for optimal function. While it can be installed horizontally or vertically, the specific design (swing or lift type) dictates the preferred orientation to ensure the disc closes properly by gravity or flow. Consult our technical datasheet for guidance on your specific model. -
Q: What specific information is included in the Mill Test Report?
A: The MTR typically includes the heat number/lot number of the stainless steel material, verified chemical analysis (percentages of Cr, Ni, Mo, C, etc.), mechanical test results (yield strength, tensile strength, elongation), and heat treatment data, providing full material traceability. -
Q: Is the valve suitable for both liquid and gas service?
A: Yes, this stop check valve is designed for use with various fluids, including water, steam, oil, gas, and certain chemicals. The specific pressure rating, seat material, and body grade should be selected based on the fluid properties, temperature, and pressure. -
Q: Do you offer customization for pressure ratings or connections not listed?
A: Yes. While we stock valves to common standards (GB, ANSI, DIN), we can customize pressure classes, end connections (like special flange standards), materials, and actuator types to meet specific project requirements. Please provide your detailed specifications for a quote. -
Q: How is the valve tested before shipment?
A: Each valve undergoes standard factory tests, which may include shell strength tests (hydrostatic pressure), seat leakage tests, and functional operation tests. Detailed test certificates can be provided upon request to meet project-specific inspection protocols. -
Q: What is the typical lead time for an order?
A: Lead time depends on the valve size, material specification, and order quantity. Standard configurations may have shorter lead times, while customized or large orders require more production planning. We provide estimated lead times with every quotation. -
Q: What after-sales support do you provide?
A: We provide technical documentation, installation and maintenance manuals, and responsive support for technical inquiries. For critical components, we can also discuss spare part kits to ensure long-term operational reliability.
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