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Help CenterHeavy-Duty Cast Iron Stop Check Valve for Pump Protection, Compliant With GB/T1855 Standard
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As a leading manufacturer with a strong commitment to quality and reliability, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our Heavy-Duty Cast Iron Stop Check Valve, engineered specifically for robust pump protection. Since our establishment in 2016, we have dedicated ourselves to producing industrial valves that meet the rigorous demands of global markets. This valve is a cornerstone of our product line, designed not only to prevent damaging reverse flow in pumping systems but also to provide a positive shut-off capability, ensuring operational safety and system integrity. Compliant with the GB/T1855 standard, it represents a fusion of durable construction, precise engineering, and proven performance, making it a trusted choice for engineers and project managers worldwide.
Our valve is meticulously crafted to deliver superior performance in demanding environments. Below are its key features and technical advantages:
- Dual-Function Design: Combines the features of a check valve and a stop valve. It allows forward flow, prevents reverse flow (check function), and can be manually closed to isolate a section of the pipeline completely (stop function).
- Rugged Cast Iron Construction: The valve body is made from high-grade cast iron, providing exceptional strength, corrosion resistance, and longevity, even under high-pressure and high-vibration conditions typical in pump applications.
- Enhanced Pump Protection: Specifically designed to safeguard pumps from water hammer and reverse rotation caused by sudden pump stoppage or power failure, significantly extending pump lifespan and reducing maintenance costs.
- Low Pressure Drop: The internal design minimizes flow resistance, ensuring efficient system operation and reducing energy consumption for the pumping system.
- Reliable Sealing: Features a resilient seal (e.g., EPDM or NBR) on the disc and a precision-machined seat to ensure bubble-tight shut-off in both check and stop modes, preventing leaks and ensuring system efficiency.
- Easy Operation and Maintenance: The external yoke and handwheel allow for easy manual operation. The design often permits in-line maintenance without removing the entire valve from the pipeline, saving time and labor.
Here is a summary of typical technical specifications:
| Specification | Detail |
| Body Material | Cast Iron (GGG-40/50 or equivalent) |
| Disc Material | Cast Iron / Bronze / Stainless Steel (optional) |
| Seat Seal Material | EPDM, NBR, or other elastomers (customizable) |
| Nominal Diameter (DN) | DN50 to DN600 (2" to 24") |
| Pressure Rating (PN) | PN16, PN25 (Higher ratings available upon request) |
| Temperature Range | -20°C to 120°C (for standard seals) |
| Connection Standard | Flanged per ANSI, DIN, JIS, or GB standards |
| Operation | Manual Handwheel (Gear operator optional for large sizes) |
| Compliance | GB/T1855 Standard for Iron Gate Valves |
The benefits of integrating this valve into your system are clear:
- System Safety: Prevents catastrophic pump failure and pipeline damage from reverse flow, protecting valuable assets.
- Operational Efficiency: Reduces system downtime by allowing isolated maintenance and preventing flow-related disruptions.
- Cost Savings: Extends the service life of pumps and related equipment, leading to lower total cost of ownership.
- Versatility: Suitable for a wide range of applications including waterworks, HVAC systems, industrial water supply, fire protection systems, and irrigation.
- Compliance Assurance: Meeting the GB/T1855 standard ensures a recognized level of quality and dimensional interchangeability in many markets.
Backed by our ISO9001-certified manufacturing processes, every valve undergoes stringent quality checks to ensure it meets our high standards and your specific requirements. Our annual export value of US$1 Million to US$1.5 Million is a testament to the trust placed in us by clients across North America, South America, Europe, Asia, Africa, and Oceania. We ship efficiently from major ports like Shanghai, Guangzhou, Hong Kong, and Beijing, ensuring timely delivery to your project site. Choosing Shanghai Zhibang's Heavy-Duty Cast Iron Stop Check Valve means investing in a reliable, durable, and high-performance component that will safeguard your critical pumping systems for years to come. Contact us today to discuss your project needs or to request a detailed quotation.
Frequently Asked Questions (FAQ)
Q1: What is the primary 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 shut-off feature. You can positively close the valve using the handwheel, isolating a section of the line even if there is forward pressure, offering greater control for maintenance or system segmentation.
Q2: Is this valve suitable for use with other fluids besides water?
A: Yes, it can be used with various non-aggressive liquids such as oils, certain chemicals, and steam, provided the fluid compatibility with the body material (cast iron) and the selected seal material (like EPDM or NBR) is confirmed. We offer customizable sealing options for specific media.
Q3: What are the available pressure classes, and how do I choose the right one?
A: Standard pressure ratings are PN16 and PN25. The selection depends on your system's maximum working pressure. It is recommended to choose a valve with a pressure rating equal to or higher than the system's peak pressure, including any potential surge pressures. We can provide valves for higher pressure requirements upon inquiry.
Q4: Can this valve be installed in any orientation?
A: For optimal performance and to ensure the check function works correctly, it is generally recommended to install the valve with the stem vertical or within a specified angle range. Horizontal installation with the stem horizontal is also common. Please consult our installation manual or contact our technical team for specific guidance based on your application.
Q5: Does compliance with GB/T1855 make it suitable for international projects?
A> Absolutely. The GB/T1855 standard is a respected Chinese national standard for iron gate valves, ensuring quality, dimensions, and performance. Many of our international clients accept valves manufactured to this standard. Furthermore, we can often supply valves with flanges machined to other international standards like ANSI or DIN to suit project specifications.
Q6: What is the lead time for an order, and what is the minimum order quantity (MOQ)?
A> Lead times vary based on valve size, quantity, and customization. Standard sizes are often available from stock or have shorter lead times. Our MOQ is typically low, and we are flexible to accommodate both small trial orders and large project volumes. Please contact our sales team for a precise quote and delivery schedule.
Q7: What kind of maintenance does this valve require?
A> Designed for durability, it requires minimal maintenance. Periodic external inspection for leaks and operation of the handwheel to ensure free movement is recommended. The sealing components may require replacement after a long service life, but the robust cast iron body typically lasts for decades.
Q8: Do you provide any warranty or after-sales support?
A> Yes, we provide a standard warranty against manufacturing defects. Our experienced technical team offers comprehensive after-sales support, including installation guidance, troubleshooting assistance, and spare parts supply, ensuring your complete satisfaction.
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