PVC-U, CPVC, or PP diaphragm valves specified for sustained process chemical exposure — the practical middle ground between general utility service and fully corrosion resistant PVDF valves.
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 Chemical Duty Diaphragm Valves Manufacturers and Custom Chemical 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
Chemical duty diaphragm valves are specified with body wall thickness, diaphragm material, and bonnet construction sized for continuous, sustained exposure to process chemicals rather than intermittent or diluted contact. The body is offered in PVC-U, CPVC, or PP depending on the chemistry and temperature involved, with the diaphragm elastomer chosen from a wider selection than the standard range to match specific reagents, solvents, or reactive intermediates used in chemical processing.
This valve family sits between general-purpose diaphragm valves sized for utility water and the fully corrosion resistant PVDF range built for the most aggressive fluids — it is the practical specification for the bulk of chemical processing duty that is corrosive enough to rule out a general-purpose valve, but does not require PVDF's cost or extended temperature range. Careful material matching between body and diaphragm remains central to reliable service life.
Continuous process chemical duty calls for a valve specified beyond general utility service, without necessarily needing the highest-tier corrosion resistant materials.
Chemical duty service calls for closer attention to both body material and diaphragm elastomer than general utility applications.
| Material | Temperature Range | Typical Strengths | Common Use |
| PVC-U | 0°C to 60°C | Broad acid and alkali resistance, cost-effective for continuous exposure | General chemical processing at moderate temperature |
| CPVC | 0°C to 95°C | Higher temperature ceiling than PVC-U with similar chemical resistance | Elevated-temperature chemical processing |
| PP | 0°C to 90°C | Strong solvent resistance, well suited to continuous chemical contact | Solvent-heavy and general chemical process lines |
| Item | Description |
| Valve Type | Weir-type chemical duty diaphragm valve |
| Body Material | PVC-U, CPVC, or PP |
| Diaphragm Material | EPDM, FPM (Viton), PTFE-faced EPDM, or specialty elastomer |
| Bonnet Material | Matched to body 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, material dependent |
| Sealing Performance | Bubble-tight shutoff, suitable for throttling duty |
| Operation | Handwheel standard; actuator mounting available |
| Service Basis | Sized for continuous, sustained chemical exposure rather than intermittent contact |
Both use the same diaphragm sealing principle; chemical duty units are specified with continuous exposure in mind.
| Factor | Chemical Duty Diaphragm Valve | General-Purpose Diaphragm Valve |
| Exposure Basis | Sized for continuous, sustained chemical contact | Sized for general water and utility service |
| Diaphragm Options | Wider elastomer selection to match specific reagents | Standard EPDM or FPM options typically sufficient |
| Material Matching Effort | Closer chemical compatibility review recommended | Simpler selection for common utility fluids |
| Typical Fluids | Process chemicals, reagents, solvents | Water, dilute chemicals, general utility fluids |
| Cost | Somewhat higher for specialty diaphragm options | Lower for standard diaphragm materials |
| Best Use | Chemical processing and reagent handling lines | Water treatment, utility, and general plant piping |
A process-matched diaphragm is pressed onto the weir seat by a compressor sized for sustained chemical duty.
Inspection includes a review of diaphragm material selection against the intended chemical service in addition to standard sealing checks.
A bonnet-mounted actuator interface allows the handwheel to be replaced with pneumatic or electric operation for automated chemical process duty.
| Operation Type | Best Suited For | Key Characteristics |
| Handwheel | Local chemical process throttling and shutoff | Lowest cost, direct tactile control of diaphragm position |
| Pneumatic Actuator | Automated reagent dosing and batching lines with air supply available | Fast cycling for sequencing or batch control |
| Electric Actuator | Remote-controlled or monitored chemical process 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.
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Overview The full diaphragm valve range, from bo
Overview Compressed-air operation for automated
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Overview A threaded-end diaphragm body sized for
Overview A flanged PVC-U body with a flexible di
Overview A raised-seat body geometry that reduce
Share the reagents, concentrations, and temperature in your process line, and get a body and 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 Chemical Duty Diaphragm Valves Manufacturers
