Diye Valve Company is a professional China check valve manufacturer with rich experience in the fluid control industry, and a dependable one-stop check valve supplier. Relying on our large-scale production factory, we have built an efficient production and delivery system for export orders.
We accept export check valve orders meeting GB, ANSI, DIN, JIS and GOST standards, and support customization of non-standard sizes, special materials and special pressure ratings to fit diverse overseas industrial working conditions. We focus on the R&D, production and sales of industrial-grade check valves, with all products strictly made per authoritative domestic and international valve standards. Featuring a simple structure, reliable sealing and exceptional backflow prevention performance, our check valves are widely used in petroleum, chemical, power, municipal, water supply and drainage, HVAC and other pipeline systems, acting as key components to prevent medium backflow and ensure safe equipment operation.
Main Standards for Check Valves
Diye valve manufactures industrial check valves in compliance with four universal international standards to meet the requirements of domestic and overseas projects:
GB/T Series (Chinese National Standards)
Conforms to GB/T 13927, GB/T 12236 and other standards, suitable for domestic industrial, municipal, water supply and drainage projects.
ASME/ANSI System (American Standards)
Conforms to ASME B16.34, B16.10 and other standards, for export to overseas markets such as North America and the Middle East.
EN/DIN System (European Standards)
Meets European standards, suitable for EU equipment supporting and engineering projects.
JIS System (Japanese Industrial Standards)
Custom production available according to Japanese standards to meet the needs of specific overseas markets.
GOST Standard (Russian Standard)
Products comply with standards applicable to Russia, Kazakhstan, Belarus and other countries.
Common Pressure Ratings for Check Valves
1. Nominal Pressure PN Series (GB / EN Standards)
Common pressure ratings for check valves: PN10, PN16, PN25, PN40, PN63, PN100
PN10, PN16: For low-pressure general applications such as clean water, air, HVAC, municipal water supply and drainage.
PN25, PN40: For medium-pressure applications such as oil, circulating water and compressed air.
PN63 and above: For severe conditions including high pressure, high temperature, steam and chemical media.
2. Class Series (American Standards / for Export)
Common pressure ratings for export check valves: Class 150, Class 300, Class 600, Class 900
Class 150: For general industrial applications.
Class 300, Class 600: Mainstream pressures for petroleum, chemical and power industries.
High Class ratings: For extreme conditions such as high temperature & high pressure, high-pressure steam and oil-gas transportation.
Core Purpose & Working Principle
Check valves produced by Diye Valve are essential automatic control valves in all kinds of fluid pipelines. Their core purpose is to prevent backflow, protect equipment safety, and maintain stable pipeline operation. They feature automatic opening and closing, unidirectional flow, tight sealing and low flow resistance. They require no manual operation and open/close fully by the flow pressure of the medium itself, making them ideal for automated pipeline systems.
When medium flows forward, pressure pushes the disc to open automatically, allowing smooth flow with low resistance and low energy consumption. When backflow or reverse pressure occurs, the disc closes quickly and automatically under its own weight and reverse pressure, completely blocking reverse flow with zero leakage.
Products include swing check valves, lift check valves, wafer check valves and other types, suitable for horizontal, vertical and other installation methods. They are flexible to install and easy to maintain, applicable to small-bore civil and light industrial pipelines as well as large-bore, high-flow municipal and industrial main pipelines.
As a reliable China check valve supplier, Diye Valve’s factory custom-develops check valves in various specifications for different industries, meeting the needs of water supply & drainage, petrochemical, HVAC, sewage treatment, power, metallurgy, fire protection systems and other applications.
Precision Manufacturing Process
In terms of production technology, check valve bodies are made of high-quality cast iron, cast steel, stainless steel and other materials through precision casting or forging, with uniform wall thickness and stable structure, free of defects such as air holes and sand holes.
Core sealing components – discs and seats – are processed by CNC precision cutting and high-precision polishing, ensuring flat sealing surfaces, strong wear resistance, corrosion resistance and tight sealing.
Welded parts adopt high-standard welding technology, followed by heat treatment to eliminate internal stress and improve pressure resistance.
Before delivery, every check valve undergoes shell strength test, sealing performance test and opening-closing flexibility test to ensure compliance with industry standards and customer requirements, demonstrating the craftsmanship and strength of Made in China.
Diye Valve has become a core Chinese check valve supplier for long-term cooperation with many projects, enterprises and distributors, proving the responsibility and capability of a professional manufacturer with real strength.
Export, Customization & Delivery
As a professional China check valve manufacturer and reliable one-stop valve supplier, Diye Valve operates our own large-scale production factory, with extensive expertise in the fluid control industry. All our check valves fully comply with international and domestic industrial standards, meeting strict global pipeline requirements. We enforce rigorous quality control across the entire production process, and every unit undergoes strict pressure and sealing tests before shipment, guaranteeing stable performance, reliable sealing and long-lasting durability in diverse working conditions.
We offer unbeatable cost-performance ratio via direct factory supply, cutting out middleman markups to deliver premium quality at competitive prices. Additionally, we have built an efficient export order production and delivery system for timely scheduling and on-time delivery, making us your ideal partner for high-quality, reliable check valves that ensure safe and stable pipeline operation.
