A full range of plastic check valves that stop backflow automatically, in swing, ball, spring-loaded, vertical, and foot configurations for corrosive and clean fluids alike.
Ningbo Baodi Plastic Valve Co., Ltd. traces its origins back to 1979, with its predecessors being Zhenhai Chemical Valve Factory and Beilun Plastic Valve Factory. The company is one of the earliest Industrial Plastic Check Valves Manufacturers and Custom Industrial Plastic Check Valves Factory in China to design and produce industrial plastic valves and receive acceptance from the Ministry of Chemical Industry. In 1979, the company manufactured its first plastic diaphragm valve, which passed the technical appraisal of the Ministry of Chemical Industry in 1983. In 1992, the company invented the one-piece flange ball valve, a structural design that has since become the most widely used plastic valve product in chemical-related industries. The development history of the company and its predecessors also represents an important chapter in the application of plastic valves in China's industrial production.
In 2006, the company expanded its product line to cover industrial plastic pipes and fittings, becoming one of the first domestic enterprises to apply CPVC material in the production of industrial-grade piping valves. Over more than 40 years since its establishment, the company has designed and manufactured various plastic valves for the most demanding industries. It has served tens of thousands of enterprises both domestically and internationally, exporting to more than 60 countries, and has consistently remained a leading manufacturer of industrial thermoplastic valves and piping systems. Our professional service and stable quality have always been well received and recognized by customers.
Baodi ranks among the global leaders in the number of product categories, capable of fully covering industrial plastic pipe and valve requirements. The company has obtained ISO 9001, ISO 14001, and ISO 45001 system certifications, as well as the national special equipment pressure piping component manufacturing license. It is recognized as a National High-Tech Enterprise and a Ningbo City Specialized and Sophisticated Enterprise. Baodi is a principal drafter of the national standard for plastic diaphragm valves and the chemical industry standards for plastic diaphragm valves, plastic ball valves, and plastic check valves.
Design Idea
2D Drawing
3D Modeling
Mold Fabrication
Prototype Testing
Full-scale production
Industrial plastic check valves let fluid flow in one direction and close automatically when flow stops or reverses, protecting pumps, meters, and process equipment from backflow. They have no stem, no handle, and need no power; the fluid itself opens the valve. The range covers swing, ball, spring-loaded, vertical lift, and foot valve designs in PVC-U, CPVC, PP, and PVDF.
Each check design suits a different job. Swing checks give a full-bore, low-loss path in horizontal lines, ball checks pass solids and wastewater, spring-loaded checks close fast in any orientation, vertical checks work in upward flow, and foot valves hold prime on a pump suction. Choosing among them depends on mounting orientation, fluid cleanliness, flow rate, and how quickly the valve must close.
Anywhere flow reversal could damage equipment, contaminate a source, or lose prime, a check valve is the safeguard.
The body material sets chemical resistance, but the internal design decides how the valve behaves in the line.
| Design | Orientation | Typical Strengths | Common Use |
| Swing Check | Horizontal, or vertical upward flow | Full bore, low pressure loss | Clean water and chemicals at moderate velocity |
| Ball Check | Horizontal or vertical | Passes solids, self-cleaning | Wastewater, slurries, dosing lines |
| Spring-Loaded Check | Any orientation | Fast closing, low surge | Pump discharge, dosing, vertical lines |
| Foot Valve | Vertical suction line | Holds prime with strainer | Tank and well suction |
| Item | Description |
| Valve Type | Plastic check valve: swing, ball, spring-loaded, vertical, or foot |
| Body Material | PVC-U, CPVC, PP, or PVDF |
| Seal Material | EPDM or FPM |
| Size Range | DN15 – DN300 (1/2 inch – 12 inch), depending on design |
| End Connection | Socket, threaded, or flanged |
| Working Pressure | Up to 235 psi (16 bar) at 20°C, depending on design and size |
| Working Temperature | 0°C to 90°C, material dependent |
| Operation | Automatic, flow-driven; no external power |
| Flow Direction | One direction, marked on the body |
A check valve protects automatically; a manual or actuated valve needs an operator or control signal.
| Factor | Check Valve | Manual or Actuated Valve |
| Operation | Automatic, driven by flow | Operator or control signal required |
| Response to Flow Reversal | Closes without delay | Only if commanded |
| Isolation for Service | Not a tight isolation device | Provides positive isolation |
| Power Needed | None | Air or electricity for actuators |
| Pressure Drop | Some loss from the moving element | Very low when fully open |
| Best Use | Backflow prevention | Isolation and flow control |
A single moving element sits in the flow path and seats against the body when flow stops or reverses.
Opening, closing, and sealing behavior are tested for every check valve design.
Orientation, fluid, and closing speed usually decide the design.
| Design | Best Suited For | Key Characteristics |
| Swing Check | Horizontal clean-fluid lines | Full bore, low pressure loss |
| Ball Check | Dirty or solids-laden fluid | Self-cleaning, wide passage |
| Spring-Loaded Check | Fast closing or any-orientation lines | Reduces water hammer |
| Foot Valve | Pump suction from a tank or well | Holds prime, strainer inlet |
Payment: T/T (bank transfer), L/C, and PayPal are accepted, with flexible terms for repeat orders. A deposit is typically required to confirm production.
Shipping: Sea freight (FCL/LCL) for bulk orders, air freight for urgent shipments, and express courier for samples. Valves are cartoned or crated depending on size.
Delivery: Shipment from the nearest available port or airport, with door-to-door, FOB, CIF, or EXW terms on request.
Each valve is covered under a standard warranty against manufacturing defects in material and workmanship, generally valid for 12 months from the shipment date.
Overview The full diaphragm valve range, from bo
Overview Built for corrosive and high-purity flu
Overview A spring-assisted element that closes f
Overview CPVC shutoff engineered for hot water a
Overview Lift-type checks designed for upward fl
Overview A free-moving ball that seals the line
Overview A hinged disc that swings clear of the
Overview Compressed-air operation for automated
Overview A slim wafer body that clamps between s
Share your fluid, orientation, size, and closing speed needs, and get a design recommendation.
Start your cooperation journey with Baodi
Contact
baodivalve@bdsjfm.com
+86-574-86817753
+86-574-86812190
After-Hours Hotline：
+86-18395898313
NO.42 Yongjiang Road, Beilun,Ningbo city, Zhejiang province,P.R.China
Custom Industrial Plastic Check Valves Manufacturers
