A weir-type diaphragm valve in CPVC for hot water and elevated-temperature chemical duty — the same stem-free, clog-resistant sealing with a higher temperature ceiling than standard PVC-U.
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 CPVC Lined Diaphragm Valves Manufacturers and Custom CPVC Lined 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
CPVC lined diaphragm valves use a body or internal lining molded from chlorinated polyvinyl chloride rather than standard PVC-U, raising the usable temperature ceiling to around 95°C while retaining most of PVC-U's broad chemical resistance. This makes CPVC the practical choice wherever a diaphragm valve is needed on hot process water, elevated-temperature acids and alkalis, or hot chemical transfer lines that would otherwise soften or distort a PVC-U body over time.
The valve keeps the same weir-type flow path and flexible diaphragm arrangement used across the PVC-U diaphragm valve range, so solids-handling ability and throttling performance are unchanged — only the operating temperature range is extended. A diaphragm rated for the higher temperature, typically EPDM or FPM depending on the fluid, completes the assembly, isolating the bonnet and stem from hot process media just as it does on standard-temperature diaphragm valves.
CPVC is chosen wherever the fluid temperature would push a PVC-U diaphragm valve beyond its safe operating range.
Choosing CPVC over PVC-U, PP, or PVDF comes down to the temperature and chemical profile of the line it protects.
| Material | Temperature Range | Typical Strengths | Common Use |
| CPVC (this valve) | 0°C to 95°C | High-temperature version of PVC chemistry, strong acid/alkali resistance | Hot water, elevated-temperature chemical lines |
| PVC-U | 0°C to 60°C | Similar chemical resistance, lower cost | Cool-service water and chemical transfer |
| PP | 0°C to 90°C | Good solvent resistance, lighter weight | General process and dosing lines |
| PVDF | -20°C to 99°C | Superior resistance to strong oxidizers and halogens | High-purity and aggressive chemical duty |
| Item | Description |
| Valve Type | Weir-type CPVC diaphragm valve |
| Body Material | CPVC |
| Diaphragm Material | EPDM, FPM (Viton), or PTFE-faced EPDM |
| Bonnet Material | CPVC or glass-reinforced polypropylene |
| Size Range | DN15 – DN100 (1/2 inch – 4 inch) |
| End Connection | Socket, threaded, or flanged |
| Working Pressure | Up to 150 psi (10 bar) at 20°C, rating decreases with temperature |
| Working Temperature | 0°C to 95°C |
| Sealing Performance | Bubble-tight shutoff, suitable for throttling duty |
| Operation | Handwheel standard; actuator mounting available |
| Flow Path | Weir-type body with raised seat for reduced diaphragm travel |
The two materials share the same diaphragm valve design, but their working temperature ranges set them apart.
| Factor | CPVC Diaphragm Valve | PVC-U Diaphragm Valve |
| Maximum Temperature | About 95°C | About 60°C |
| Chemical Resistance | Comparable broad resistance to acids and alkalis | Comparable broad resistance to acids and alkalis |
| Hot Water Suitability | Suitable for domestic and process hot water | Not recommended above roughly 60°C |
| Cost | Somewhat higher than PVC-U | Lower cost for cool-service lines |
| Diaphragm Rating | Diaphragm selected to match CPVC's higher ceiling | Diaphragm rated for standard-temperature service |
| Pipe Compatibility | Solvent-welds or threads to CPVC pipe and fittings | Solvent-welds or threads to PVC-U pipe and fittings |
A compressor driven by the handwheel presses a temperature-rated diaphragm down onto the weir seat within the CPVC body.
Inspections confirm both sealing performance and dimensional accuracy, with attention to CPVC's higher-temperature service.
A bonnet-mounted actuator interface allows the handwheel to be replaced with pneumatic or electric operation for automated hot-process duty.
| Operation Type | Best Suited For | Key Characteristics |
| Handwheel | Local hot-process throttling and shutoff | Lowest cost, direct tactile control of diaphragm position |
| Pneumatic Actuator | Automated hot-process lines with compressed air available | Fast cycling for sequencing or batch control |
| Electric Actuator | Remote-controlled or monitored hot water and chemical lines | Integrates with control systems and remote monitoring |
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 cartons or wooden crates with anti-collision padding.
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 fully non-metallic flow path for aggr
Overview The full diaphragm valve range, from bo
Overview A raised-seat body geometry that reduce
Overview A diaphragm valve sized and specified f
Overview Handwheel-operated diaphragm shutoff fo
Overview Compressed-air operation for automated
Overview A threaded-end diaphragm body sized for
Overview A flanged PVC-U body with a flexible di
Overview A reinforced body and bonnet for demand
Share your fluid temperature, pressure, and sizing requirements, and get a diaphragm material 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 CPVC Lined Diaphragm Valves Manufacturers
