Your Leading Gate Valve Manufacturer in China
JiangHeng Check Valves, as a leading brand in the Chinese valve manufacturing industry, has been engaged in research and manufacturing for many years and has established the most complete industry check valve product matrix. From DN15 micro precision valves to DN4500 ultra-large diameter special check valves, JiangHeng has its own complete production supply chain.
The sealing of JiangHeng gate valves achieves a micro-control standard of 0.0001 m3/h, far exceeding the requirements of API 598 specifications. With 100,000 stable opening and closing operations, it provides safety and quality assurance for various applications such as oil pipelines, smart water supply, and energy transmission.
In JiangHeng, according to your requirements, special gate valves can be customized with other requirements such as rare materials, dimensions, sealing surface materials, driving methods, pressure sizes, and colors.
Irrespective of whether the valve you choose is for industrial use or conventional application scenarios, JiangHeng is your best supplier. We offer competitive prices while also ensuring quality.
FAQāGate Valve
The gate valve is a valve that opens and closes by vertically lifting the valve plate (gate). It is mainly used to cut off or fully open the flow of pipeline media. It has the characteristics of small flow resistance and reliable sealing. It is widely used in industrial fields such as petroleum, chemical, electric power, and water treatment.
Common types include:
- According to the structure : rising stem gate valve, concealed stem gate valve;
- By gate : parallel gate valve, wedge gate valve (single/double gate);
- By material: cast iron gate valve, cast steel gate valve, stainless steel gate valve.
The selection should be based on the medium characteristics (corrosiveness, temperature), pressure level (such as Class 150/300) and working conditions (normally open/frequent opening and closing).
- Structural differences : the gate valve disc moves vertically, while the stop valve disc moves obliquely;
- Applicable scenarios : Gate valves are suitable for full opening/full closing, and stop valves can adjust flow;
- High-pressure applicability: Gate valves are more suitable for high-pressure systems (such as oil pipelines) due to their small flow resistance and less wear on the sealing surface.
Key installation specifications:
- Direction check : confirm that the valve flow direction is consistent with the pipeline medium;
- Avoid inverted installation : rising stem gate valves need to reserve space for stem lifting;
- Clean the pipe : remove welding slag after welding to prevent damage to the sealing surface;
- Bolt pre-tightening: Tighten the flange bolts evenly diagonally to avoid leakage.
Typical problems and solutions:
- Valve stem stuck : insufficient lubrication or impurities intrusion, clean and add high-temperature grease;
- Seal leakage : replace the valve seat seal or grind the gate seal surface;
- Valve body rust: Choose stainless steel or fluorine-lined material and perform anti-corrosion treatment regularly.
Maintenance points:
- Regular lubrication : add lubricant to the valve stem and gear box every 3-6 months;
- Cleaning and maintenance : clean the impurities in the valve cavity when the machine is shut down;
- Seal inspection: Perform a pressure test (such as a water pressure test) once a year.
Recommended materials:
- ā¤425ā : Carbon steel (WCB);
- ā¤600ā : chromium-molybdenum steel (WC6/WC9);
- Corrosive media: stainless steel (CF8/CF8M) or nickel-based alloy.
Not recommended. Gate valves are designed to be fully open or fully closed. When partially open, high-speed fluid will erode the sealing surface, causing valve damage and leakage risks. Stop valves or control valves should be used for flow regulation.
Common international standards:
- API 600 : Steel gate valves for petroleum and natural gas;
- ANSI B16.34 : Valve pressure-temperature rating;
- ISO 5208 : Industrial valve leakage test;
- GB/T 12234: China national standard for flanged gate valves.
Key points for quality inspection:
- Material report : Check the material chemical composition and mechanical properties test certificate;
- Pressure test : Suppliers are required to provide shell test (1.5 times the pressure) and sealing test reports;
- Brand reputation : Choose a well-known manufacturer with API/ISO certification.