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Help CenterHigh Pressure Stop Check Valve, Stainless Steel Construction, Compliant With GB/T1855 Standard
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As a professional manufacturer with a foundation built on ISO9001-certified quality management and nearly a decade of industry experience since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. is proud to present our High Pressure Stop Check Valve. Engineered for demanding applications, this valve combines the critical functions of a stop valve and a check valve into a single, robust unit. Constructed entirely from premium stainless steel, it offers exceptional resistance to corrosion, erosion, and high temperatures, ensuring reliable performance and long service life in the most challenging environments. Our commitment to precision manufacturing and adherence to the GB/T1855 standard guarantees a product that meets stringent performance criteria for safety and efficiency, making it an intelligent choice for system designers and operators worldwide.
This valve is specifically designed to prevent reverse flow (check function) while also providing positive shut-off (stop function) when required. Its robust stainless steel construction is key to its durability. We utilize grades such as 304, 316, or 316L to suit various media and environmental conditions, from corrosive chemicals to high-purity steam. The design minimizes pressure drop across the valve, contributing to overall system efficiency.
Key Features & Technical Advantages:
- Dual-Function Design: Integrates isolation and check valve capabilities, saving space, reducing installation points, and lowering overall system cost and weight.
- Superior Corrosion & Erosion Resistance: The stainless steel body and internals withstand aggressive media, including acids, alkalis, and high-velocity fluids, significantly extending maintenance intervals.
- High-Pressure Integrity: Engineered with a reinforced body structure and precision-machined seating surfaces to maintain a bubble-tight seal at rated pressures, preventing leaks and ensuring safety.
- Reliable Reverse Flow Prevention: The internal check mechanism responds quickly to flow reversal, preventing water hammer and protecting upstream equipment like pumps and compressors.
- Flexible Operation: Available in manual handwheel, gear-operated (for larger sizes), or automated actuator configurations (pneumatic/electric) for remote or process-controlled operation.
- Broad Compatibility: Flanged ends are machined to common global standards (ANSI, DIN, JIS), facilitating easy integration into existing piping systems worldwide.
Detailed Technical Specifications:
| Parameter | Specification / Range |
| Design & Manufacturing Standard | GB/T1855 |
| Pressure Class (ANSI) | Class 150 to Class 2500 (or PN10 to PN420) |
| Size Range (Nominal Diameter) | DN15 (1/2") to DN600 (24") |
| Body & Trim Material | Stainless Steel (SS304, SS316, SS316L, CF8M, etc.) |
| Seat & Disc Material | Stainless Steel, Stellite, or other hardened alloys |
| Temperature Range | -29°C to 425°C (-20°F to 800°F) standard |
| End Connection Types | Flanged (RF, RTJ), Threaded (NPT, BSP), Butt-Weld |
| Leakage Class (Seat) | ANSI/FCI 70-2 Class IV or better (metal seat) |
Benefits for Your Operation:
- Enhanced System Safety: Prevents catastrophic reverse flow events, protecting personnel and capital equipment.
- Reduced Total Cost of Ownership: Durable stainless steel construction and reliable performance minimize downtime, maintenance, and replacement costs.
- Operational Flexibility: The stop function allows for isolation of specific system sections for maintenance without needing a separate valve.
- Global Project Compliance: Adherence to GB/T1855 and capability to meet other international standards makes it suitable for projects anywhere, from domestic Chinese plants to international ventures.
Applications: This valve is ideal for critical services in: • Oil & Gas: Wellhead control, pipeline transmission, refinery process lines. • Power Generation: Boiler feedwater systems, steam lines, turbine bypass. • Chemical & Petrochemical: Handling corrosive and high-purity process fluids. • Marine & Offshore: Seawater cooling, ballast, and firefighting systems. • Pharmaceutical & Food: Where hygiene and corrosion resistance are paramount (with appropriate surface finishes).
Trust in a product backed by a manufacturer with a proven global footprint. Shanghai Zhibang's valves are exported from major ports like Shanghai, Guangzhou, and Hong Kong, reaching key markets across North and South America, Europe, Asia, Africa, and Oceania, with an annual export value demonstrating consistent international demand. Our ISO9001 certification is your assurance of a systematic approach to quality control at every stage of production. Choosing our High Pressure Stop Check Valve means selecting a component engineered for reliability, built for durability, and supported by a manufacturer committed to meeting global standards. Contact us today to discuss how this valve can enhance the safety and efficiency of your specific application, and request a detailed quotation.
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 reverse flow. A stop check valve adds a second function: it can be manually or automatically closed like a gate or globe valve to positively stop flow in the forward direction, providing isolation capability. -
Q: Can this valve be used in both vertical and horizontal pipe orientations?
A: Yes, the design typically allows for installation in any orientation. However, for optimal performance and disc movement, consulting the installation manual for specific model recommendations is advised. -
Q: What stainless steel grade should I choose for my application?
A: SS304 is suitable for general corrosive services. SS316 or 316L offers higher resistance to chlorides and acids, making it ideal for marine, chemical, and offshore environments. Our team can advise based on your media and operating conditions. -
Q: Is the valve suitable for steam service?
A: Absolutely. With its high-temperature rating and stainless steel construction, it is commonly used for steam lines in power plants and industrial processes. Specific material grades and seat designs can be selected for high-temperature steam. -
Q: How does the valve prevent water hammer?
A: The check mechanism is designed to close swiftly upon flow reversal, but the closure characteristics can be tailored. Some designs include dashpots or dampers to cushion the disc closure, mitigating the pressure surge associated with water hammer. -
Q: Do you offer actuators for automated operation?
A: Yes. We can supply the valve pre-fitted with pneumatic (air-to-open/air-to-close) or electric actuators, complete with limit switches and positioners, for integration into automated control systems. -
Q: What is the lead time for a custom-sized or specially configured valve?
A: Lead times vary based on complexity and current production schedule. Standard sizes and configurations typically have shorter lead times. Please inquire with your specific requirements for an accurate timeline. -
Q: What documentation do you provide with the valve?
A: Standard documentation includes a material test certificate, hydrostatic test report, dimensional drawing, and operation manual. Additional certifications can be provided upon request.
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