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Help CenterGB/T1855-1993 Suction Stop Check Box Valve With Mill Test Report and Warranty
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As a professional valve manufacturer established in 2016, Shanghai Zhibang Valve Manufacture Co., Ltd specializes in producing high-quality industrial valves for global markets. Our GB/T1855-1993 Suction Stop Check Box Valve represents our commitment to engineering excellence and reliability. This valve is meticulously designed to prevent backflow and protect pumping systems, making it an essential component for fluid control in demanding applications. Backed by our ISO9001 certified quality management system and supported by comprehensive documentation including a Mill Test Report and Warranty, this product offers our clients a dependable solution backed by technical assurance and manufacturer accountability.
This Suction Stop Check Box Valve is engineered for superior performance in pipeline systems where preventing reverse flow is critical. Its design incorporates a check mechanism within a robust box-type body, ensuring reliable shut-off when flow attempts to reverse. Key features and benefits include:
- Enhanced System Protection: Automatically closes to prevent backflow, safeguarding pumps, compressors, and other upstream equipment from potential damage caused by reverse flow.
- Robust Construction: Manufactured from durable materials such as cast iron, ductile iron, carbon steel, or stainless steel to withstand harsh operating environments, including corrosive media and high pressures.
- Low Pressure Drop: The streamlined internal design minimizes flow resistance, contributing to energy efficiency and optimal system performance.
- Non-Slam Operation (Optional): Certain models feature a spring-assisted or damping mechanism to ensure quiet, controlled closing, preventing water hammer and associated pipeline stress.
- Versatile Installation: Suitable for horizontal or vertical installation (flow direction upward), providing flexibility in system design and layout.
- Comprehensive Sealing: Utilizes high-grade seat materials like bronze, stainless steel, or rubber to ensure a tight seal and zero leakage in the closed position.
The technical specifications of our GB/T1855-1993 compliant valve are detailed below. Please note that specific parameters can be customized upon request to meet your project requirements.
| Parameter | Specification / Range |
|---|---|
| Design Standard | GB/T1855-1993 |
| Nominal Diameter (DN) | 50, 65, 80, 100, 125, 150, 200, 250, 300, 350, 400, 450, 500, 600 mm |
| Nominal Pressure (PN) | PN10, PN16, PN25 (Common), Class 150 also available |
| Body Material | Cast Iron (HT200/250), Ductile Iron (QT450-10), Carbon Steel (WCB), Stainless Steel (CF8/CF8M) |
| Disc/Seat Material | Bronze, Stainless Steel (304/316), NBR Rubber, EPDM |
| Connection Type | Flanged (GB/T 17241, ANSI B16.5), Threaded (NPT, BSP), Welded (Butt Weld) |
| Operating Temperature | -20°C to +120°C (Standard), up to +200°C (High-Temp Options) |
| Applicable Media | Water, Oil, Gas, Steam, Weak Corrosive Fluids |
The advantages of choosing our valve extend beyond its specifications. Its compliance with the Chinese national standard GB/T1855-1993 guarantees a level of design consistency, performance testing, and manufacturing quality recognized in many international projects. The inclusion of a Mill Test Report (MTR) provides full traceability of material chemical composition and mechanical properties, offering transparency and quality verification for engineers and procurement teams. Coupled with a standard Warranty against manufacturing defects, it significantly reduces long-term operational risk and total cost of ownership for our clients.
Trust is built on proven performance and global reach. Shanghai Zhibang Valve has established itself as a reliable partner, exporting to diverse markets across North America, South America, Eastern & Western Europe, Southeast Asia, Africa, Oceania, and the Middle East. With an annual export value ranging between US$1 Million and US$1.5 Million, our products have been validated in countless installations worldwide. Our strategic location in Shanghai and multiple shipment ports (Shanghai, Guangzhou, Hong Kong, Beijing) ensure efficient and flexible logistics. This valve is not just a component; it's a commitment to system integrity and operational peace of mind. Contact us today to discuss how this Suction Stop Check Box Valve can enhance your project's reliability and efficiency.
Frequently Asked Questions (FAQ)
Q1: What is the primary function of a Suction Stop Check Box Valve?
A: Its primary function is to allow fluid flow in one direction only and automatically prevent backflow (reverse flow) when the forward flow stops or reverses. This protects pumps and other equipment installed upstream.
Q2: How does the "Box" design differ from a standard check valve?
A: The "Box" design typically refers to a robust, often rectangular or square-shaped body housing the check mechanism. This construction can offer greater structural strength and easier integration into certain piping layouts or valve assemblies compared to conventional wafer or globe-style check valves.
Q3: What does GB/T1855-1993 signify, and is it accepted internationally?
A: GB/T1855-1993 is a Chinese National Standard for "Iron and Steel Check Valves." It specifies requirements for design, dimensions, materials, testing, and marking. While it is a Chinese standard, its rigorous technical requirements are widely recognized and accepted in many international projects, especially in Asia, Africa, and the Middle East. We can also supply valves compliant with ANSI, DIN, or JIS standards upon request.
Q4: What is included in the Mill Test Report (MTR)?
A: The MTR is a certificate provided by the material manufacturer. For this valve, it typically includes data on the chemical composition, mechanical properties (like tensile strength, yield strength), heat treatment status, and impact test results for the metallic components (e.g., valve body, disc), verifying they meet the specified material grades.
Q5: Can this valve be used for vertical pipeline installation?
A: Yes, it can be installed in vertical pipelines. However, it is crucial that the flow direction is upward through the valve. Installing it with downward flow may hinder proper disc closure. Please confirm the installation orientation with our technical team.
Q6: What is the warranty period and coverage?
A: We provide a standard warranty against defects in materials and workmanship for a specified period (e.g., 12 months from shipment or 18 months from manufacture). The warranty certificate details the exact terms and conditions. It covers repair or replacement of the valve if a manufacturing defect is confirmed.
Q7: Do you offer customization for pressure ratings, sizes, or materials outside the standard range?
A: Yes, customization is available. We can engineer valves for higher pressure classes (e.g., Class 300), special sizes, or exotic materials like duplex stainless steel or Hastelloy to suit specific corrosive or high-temperature media. Please provide your detailed requirements for a quotation.
Q8: What are the main application areas for this valve?
A: It is widely used in water supply and distribution systems, wastewater treatment plants, industrial cooling circuits, firefighting systems, irrigation networks, chemical processing (with compatible materials), oil & gas pipelines (onshore), and power generation facilities for condenser and cooling water lines.
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