A reinforced-body, reinforced-bonnet diaphragm valve in PVC-U, CPVC, or PP — built for high-cycle, high-load industrial process and slurry service.
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 Heavy Duty Diaphragm Valves Manufacturers and Custom Heavy Duty Diaphragm 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
Heavy duty diaphragm valves are built with thicker body walls, a reinforced bonnet, and a heavier-duty compressor mechanism than standard diaphragm valves, extending both the working pressure rating and the valve's tolerance for frequent cycling in demanding industrial service. Molded in PVC-U, CPVC, or PP, the reinforced construction targets applications where a standard diaphragm valve's bonnet or compressor could wear prematurely under sustained mechanical load.
This valve is specified wherever a diaphragm valve is expected to cycle frequently over its service life, operate near the upper end of its pressure rating, or see heavier mechanical loading from actuator use than a standard-duty bonnet is built to handle — mining slurry lines, high-cycle batching systems, and heavy industrial process control are typical settings. The same weir-type flow path and diaphragm sealing principle is retained, with the reinforcement concentrated in the body and bonnet structure.
High-cycle and high-load service is where a heavy duty bonnet and body pay off over a standard-duty diaphragm valve.
Body material determines chemical compatibility and temperature range; the heavy duty reinforcement is available across all three materials.
| Material | Temperature Range | Typical Strengths | Common Use |
| PVC-U | 0°C to 60°C | Broad acid and alkali resistance, economical, reinforced for higher cycling | General heavy-duty water and chemical service |
| CPVC | 0°C to 95°C | Higher temperature tolerance than PVC-U with reinforced construction | Hot process water, elevated-temperature heavy-duty lines |
| PP | 0°C to 90°C | Good solvent resistance, reinforced for demanding process cycling | Heavy-duty chemical processing and dosing |
| Item | Description |
| Valve Type | Reinforced weir-type heavy duty diaphragm valve |
| Body Material | PVC-U, CPVC, or PP (reinforced wall sections) |
| Diaphragm Material | EPDM, FPM (Viton), or PTFE-faced EPDM |
| Bonnet Material | Reinforced glass-filled polypropylene or matched to body |
| Size Range | DN15 – DN150 (1/2 inch – 6 inch) |
| End Connection | Socket, threaded, or flanged |
| Working Pressure | Up to 175 psi (12 bar) at 20°C, rating decreases with temperature |
| Working Temperature | 0°C to 95°C, material dependent |
| Sealing Performance | Bubble-tight shutoff, suitable for throttling duty |
| Operation | Handwheel standard; reinforced actuator mounting available |
| Bonnet & Compressor | Reinforced for high-cycle and heavier mechanical loading |
Both share the same sealing principle; the heavy duty version is built to tolerate more demanding pressure and cycling conditions.
| Factor | Heavy Duty Diaphragm Valve | Standard-Duty Diaphragm Valve |
| Working Pressure | Up to 175 psi (12 bar) | Typically up to 150 psi (10 bar) |
| Bonnet Construction | Reinforced for high-cycle and actuator loading | Standard bonnet construction |
| Cycling Tolerance | Built for frequent, sustained actuation | Suited to moderate cycling frequency |
| Weight | Somewhat heavier for the same nominal size | Lighter for the same nominal size |
| Cost | Higher due to added material and reinforcement | Lower for equivalent size and material |
| Best Use | High-cycle, high-load industrial and slurry service | General process and utility duty |
Reinforced body walls and a strengthened bonnet support the diaphragm and compressor mechanism under heavier mechanical loading.
High-cycle units undergo an extended cycling verification in addition to the standard pressure and sealing checks.
The reinforced bonnet interface is built to handle sustained actuator loading for automated high-cycle duty.
| Operation Type | Best Suited For | Key Characteristics |
| Handwheel | Manual heavy-duty throttling and shutoff | Lowest cost, reinforced for frequent manual operation |
| Pneumatic Actuator | High-cycle automated slurry or batching lines | Reinforced bonnet supports sustained automated cycling |
| Electric Actuator | Remote-controlled heavy industrial process lines | Integrates with control systems for continuous duty cycling |
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 large-volume orders, air freight for time-sensitive shipments, and express courier for samples. Valves are packed in wooden crates with reinforced padding for the heavier body.
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 diaphragm valve sized and specified f
Overview A flanged PVC-U body with a flexible di
Overview A fully non-metallic flow path for aggr
Overview The full diaphragm valve range, from bo
Overview Compressed-air operation for automated
Overview A CPVC flow path for diaphragm valve se
Overview A threaded-end diaphragm body sized for
Overview Handwheel-operated diaphragm shutoff fo
Overview A raised-seat body geometry that reduce
Share your line's pressure, expected cycling frequency, and media details, and get a material and 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 Heavy Duty Diaphragm Valves Manufacturers
