A complete range of plastic diaphragm valves for shutoff and throttling of corrosive, abrasive, and particulate-laden fluids, with body, diaphragm, connection, and operator options to match each line.
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 Diaphragm Valves Manufacturers and Custom Industrial Plastic 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
Industrial plastic diaphragm valves isolate the process fluid from the operating mechanism with a flexible elastomer diaphragm that is pressed onto a seat by a compressor. The range covers PVC-U, CPVC, PP, and PVDF bodies, weir-type and straight-through flow paths, socket, threaded, and flanged ends, and handwheel, pneumatic, or electric operation, so a single supplier can cover most of a plant's shutoff and throttling points in one consistent design.
Selection starts with the fluid: the body material sets temperature and chemical limits, while the diaphragm elastomer is matched to the specific chemistry in contact with it. From there, the connection type follows the pipework, the flow path follows the solids content of the fluid, and the operator follows how often the valve is cycled. This page sets out how those choices fit together before moving into the individual product types.
Any line where the fluid is corrosive, carries solids, or must not touch a packed stem is a candidate for a diaphragm valve.
Each body material trades temperature range, chemical scope, and cost; the diaphragm is then selected separately.
| Body Material | Temperature Range | Typical Strengths | Common Use |
| PVC-U | 0°C to 60°C | Broad acid and alkali resistance, lowest cost | General water and chemical service |
| CPVC | 0°C to 95°C | Higher temperature ceiling with similar chemistry | Hot process water and chemicals |
| PP | 0°C to 90°C | Good solvent resistance, lightweight | Dosing, plating, general process lines |
| PVDF | -20°C to 99°C | Resistance to strong oxidizers and halogens | Aggressive and high-purity service |
| Item | Description |
| Valve Type | Plastic diaphragm valve, weir-type or straight-through |
| Body Material | PVC-U, CPVC, PP, or PVDF |
| Diaphragm Material | EPDM, FPM, or PTFE-faced EPDM |
| Size Range | DN15 – DN150 (1/2 inch – 6 inch) |
| End Connection | Socket, threaded (BSP / NPT), or flanged |
| Working Pressure | Up to 175 psi (12 bar) at 20°C, depending on size and material |
| Working Temperature | -20°C to 99°C, body and diaphragm dependent |
| Sealing Performance | Bubble-tight shutoff, with throttling capability |
| Operation | Handwheel, pneumatic actuator, or electric actuator |
| Isolation | Diaphragm separates process fluid from bonnet and stem |
Each valve style has a duty it handles best; diaphragm valves lead where solids, throttling, and stem sealing matter.
| Factor | Diaphragm Valve | Ball / Butterfly Valve |
| Solids and Fibers | Smooth flow path resists clogging | Cavity or disc edge can trap solids |
| Throttling | Good proportional control | Ball valves limited, butterfly moderate |
| Stem Sealing | Isolated from process fluid by the diaphragm | Stem seal in contact with the fluid |
| Shutoff Speed | Moderate, multi-turn handwheel | Fast quarter-turn |
| Maintenance Item | Diaphragm replaced periodically | Seats and seals replaced as they wear |
| Typical Choice For | Slurries, corrosives, fine flow control | Clean liquids, fast on/off, large diameters |
A compressor presses the diaphragm onto the weir seat, sealing the flow path while keeping the bonnet dry.
The same inspection sequence applies across every body material and size in the range.
All operator types mount on a common bonnet interface, so a manual valve can be automated later without replacing the body.
| Operation Type | Best Suited For | Key Characteristics |
| Handwheel | Local throttling and shutoff | Lowest cost, direct tactile control |
| Pneumatic Actuator | Automated lines with compressed air | Fast cycling, positioner option for modulating control |
| Electric Actuator | Remote or building-system controlled lines | Wired control, no air supply needed |
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 packed in cartons or wooden crates 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 Automatic backflow prevention in corros
Overview Built for corrosive and high-purity flu
Overview A threaded-end diaphragm body sized for
Overview A raised-seat body geometry that reduce
Overview Compressed-air operation for automated
Overview Handwheel-operated diaphragm shutoff fo
Overview CPVC shutoff engineered for hot water a
Overview A fully non-metallic flow path for aggr
Overview A slim wafer body that clamps between s
Share your fluid, temperature, size, and connection type, and get a body and diaphragm 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 Diaphragm Valves Manufacturers
