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Help CenterGB/T1855 Ductile Iron Stop Check Valve, DN50-DN200, PN10, Flanged End
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As a professional manufacturer with over eight years of expertise, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our premium GB/T1855 Ductile Iron Stop Check Valve. Engineered for reliability and durability in demanding industrial applications, this valve combines the critical functions of a check valve and a stop valve into one robust unit. It is designed to prevent reverse flow while allowing for positive shut-off, making it an indispensable component for pipeline safety and efficiency. Our commitment to quality, backed by ISO9001 certification, ensures that every valve meets stringent performance standards, offering our global clients in regions like North America, Southeast Asia, and Europe a trustworthy solution for their fluid control needs.
This valve is meticulously crafted to deliver superior performance and long service life. Below are its key features and technical specifications:
- Dual-Function Design: Acts as both a non-return check valve and a positive shut-off isolation valve, simplifying system layout and reducing installation points.
- Robust Construction: The main components, including the body, disc, and cover, are made from high-grade ductile iron, offering excellent strength, impact resistance, and corrosion resistance compared to standard cast iron.
- Reliable Sealing: Features a resilient seat (options like NBR or EPDM available) that ensures tight sealing in both flow directions when closed, minimizing leakage and pressure drop.
- Flanged Connection: Standard flanged ends (RF or FF as per standard) facilitate easy and secure installation into existing pipeline systems, compatible with common flange standards.
- Wide Size and Pressure Range: Available in sizes from DN50 to DN200 and rated for PN10 pressure, catering to a broad spectrum of industrial pipeline requirements.
- Smooth Operation: The design ensures low torque operation for the stop function, and the check mechanism allows swift response to flow reversal, protecting pumps and equipment.
Here is a summary of the primary technical parameters:
| Parameter | Specification |
| Product Standard | GB/T 1855 |
| Body Material | Ductile Iron |
| Size Range (Nominal Diameter) | DN50, DN65, DN80, DN100, DN125, DN150, DN200 |
| Pressure Rating | PN10 (10 bar) |
| Connection Type | Flanged End |
| Seat Material (Typical) | Nitrile Rubber (NBR) / EPDM (Customizable) |
| Temperature Range (Max with standard seat) | Up to 80°C (for NBR), higher options available |
| Flow Direction | Vertical or Horizontal installation (flow arrow indicated) |
The advantages of choosing our Ductile Iron Stop Check Valve translate directly into tangible benefits for your operations:
- Enhanced System Protection: Prevents water hammer and protects pumps, compressors, and other equipment from damage caused by reverse flow.
- Space and Cost Savings: Eliminates the need for separate check and gate valves, saving space, reducing weight, and lowering overall procurement and maintenance costs.
- Reduced Maintenance: The durable ductile iron construction and reliable sealing components extend service intervals and reduce downtime.
- Versatile Application: Suitable for water supply, wastewater treatment, irrigation, industrial cooling systems, oil, and gas pipelines (for compatible media).
- Global Compliance: Manufactured according to GB/T standards, which are widely recognized and accepted in international markets.
With an annual export value between US$1 Million and US$1.5 Million and a presence in major markets across North America, South America, Europe, Asia, Africa, and Oceania, Shanghai Zhibang Valve has established itself as a reliable global partner. Our products are shipped from key ports including Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring efficient logistics. The ISO9001 certification of our manufacturing process is your assurance of consistent quality and professional service. Investing in our GB/T1855 Ductile Iron Stop Check Valve means investing in a durable, efficient, and safe solution for your critical piping systems. Contact us today to discuss your specific requirements or to request a detailed quotation.
Frequently Asked Questions (FAQ)
Q1: What is the main difference between a standard check valve and this stop check valve?
A: A standard check valve only prevents reverse flow automatically. Our stop check valve adds a manual or actuated shut-off function, allowing you to completely isolate a section of the pipeline even under forward flow conditions, providing greater control.
Q2: Can this valve be installed in any orientation?
A: For optimal performance of the check function, vertical installation with flow upward is recommended. Horizontal installation is also possible, but the internal swing disc mechanism is designed to work best in the vertical position.
Q3: Are the flanges drilled according to specific standards like ANSI or DIN?
A: The valve is manufactured to GB/T 1855, which typically corresponds to flange dimensions compatible with common international standards like DIN or ANSI for the corresponding PN rating. Specific drilling patterns can be confirmed or customized upon request.
Q4: What media is this valve suitable for?
A: With standard NBR seats, it is suitable for water, air, and other neutral fluids up to 80°C. For oil, gas, or higher temperatures, alternative seat materials like EPDM, Viton, or metal seats can be provided.
Q5: Is the valve operation manual, or can it be automated?
A: The stop function is typically operated manually via a handwheel. However, the design can be adapted for actuation with electric, pneumatic, or hydraulic actuators for remote or automated control systems.
Q6: What is the expected service life of this valve?
A: The service life depends heavily on operating conditions (pressure, temperature, media). Under normal water service within its rated pressure and temperature, the robust ductile iron construction and quality seals ensure a long operational lifespan with minimal maintenance.
Q7: Do you offer customization for sizes or pressures outside the listed range?
A: Yes, as a manufacturer, we have the capability to customize valves. Non-standard sizes (larger than DN200), different pressure classes (e.g., PN16, PN25), or special coatings/linings can be discussed based on your project requirements.
Q8: What kind of testing is performed on these valves before shipment?
A> Each valve undergoes routine tests including shell strength tests, seat leakage tests, and operational checks to ensure it meets the performance criteria outlined in the relevant standards and our quality control protocols.
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