Plastic check valves with a free-moving ball that rolls onto the seat to stop backflow, self-cleaning in service and well suited to wastewater, slurries, and dosing lines.
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 Ball Type Plastic Check Valves Manufacturers and Custom Ball Type 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
A ball type plastic check valve uses a free ball sitting in a chamber in the body. Forward flow pushes the ball off its seat and along the chamber wall, opening a wide passage around it. When flow stops or reverses, the ball rolls back and seats against the inlet, sealing the line. With no hinge, spring, or stem, the design has few parts to foul.
The ball turns slightly as fluid passes, which helps keep the seat clean, and the wide chamber lets solids pass without jamming. For these reasons, ball checks are the usual choice for wastewater, slurries, and viscous or fibrous fluids. They can be mounted horizontally or vertically, usually in a true union body, so the valve can be removed for cleaning without cutting pipe.
Fluids that carry solids or are likely to foul a hinge or spring are the natural home of a ball check.
The ball is usually molded from the same family as the body, with the seal matched to the fluid.
| Component | Options | Selection Basis | Notes |
| Body | PVC-U, CPVC, PP, PVDF | Fluid chemistry and temperature | True union or single body |
| Ball | PVC-U, CPVC, PP, PVDF, or elastomer-covered | Weight and chemical resistance | Density chosen so the ball seats reliably |
| Seal | EPDM, FPM | Fluid and temperature | O-ring on the seat |
| Union Nuts | Matched to body material | Service access | Allow removal without cutting pipe |
| Item | Description |
| Valve Type | Ball type plastic check valve, true union |
| Body Material | PVC-U, CPVC, PP, or PVDF |
| Ball Material | Matched to body material, or elastomer-covered |
| Seal Material | EPDM or FPM |
| Size Range | DN15 – DN100 (1/2 inch – 4 inch) |
| End Connection | Socket, threaded, or flanged |
| Working Pressure | Up to 235 psi (16 bar) at 20°C, rating decreases with temperature |
| Working Temperature | 0°C to 90°C, material dependent |
| Orientation | Horizontal or vertical |
| Cracking Pressure | Low; depends on ball density and size |
Both are simple automatic checks; the ball handles solids better, the swing check loses less pressure.
| Factor | Ball Check | Swing Check |
| Handling Solids | Self-cleaning, passes solids | Can foul the hinge or seat |
| Pressure Loss | Moderate, ball sits in the chamber | Very low, full bore |
| Orientation | Horizontal or vertical | Horizontal or upward vertical |
| Moving Parts | Single free ball | Disc and hinge pin |
| Typical Size | Small to medium | Medium to large |
| Best Use | Dirty, viscous, or dosing fluids | Clean, steady-flow lines |
A free ball sits in a chamber and rolls onto the inlet seat when flow stops.
Ball freedom and seat sealing are verified on every unit.
The ball and seal can be matched to the fluid and to the line orientation.
| Option | Best Suited For | Key Characteristics |
| Standard Ball | General dirty-water and dosing service | Matched to the body material |
| Elastomer-Covered Ball | Quiet, soft seating on light fluids | Gentle contact with the seat |
| FPM Seal | Oils and some solvents | Broader chemical range than EPDM |
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 and palletized.
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 A hinged disc that swings clear of the
Overview A spring-assisted element that closes f
Overview A raised-seat body geometry that reduce
Overview Compressed-air operation for fast, repe
Overview Motor-driven shutoff for remote, wired
Overview Automatic backflow prevention in corros
Overview A reinforced body engineered for the up
Overview A slim wafer body that clamps between s
Overview A single-piece flanged body for direct
Share your fluid, size, orientation, and connection type, and get a configuration 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 Ball Type Plastic Check Valves Manufacturers
