Quarter-turn shutoff in a single molded body with integral ANSI/DIN/JIS flange faces — a compact, low-leak-path alternative to bolted true union valves for flanged plastic and metal pipelines.
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 One Piece Flange Ball Valves Manufacturers and Custom One Piece Flange Ball 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
One piece flange ball valves are quarter-turn shutoff valves molded as a single, seamless plastic body with integral flanges on both ends, eliminating the separate union nuts, adapters, or coupling rings used on true union designs. Manufactured from PVC-U, CPVC, or PP, the one-piece flange body removes potential leak paths at intermediate joints and gives a rigid, compact valve that bolts straight into an existing flanged pipe run using standard ANSI, DIN, or JIS flange patterns without any transition fittings.
Because the flange faces are molded directly into the body, this valve is the practical choice whenever a line is already built around flanged plastic or metal pipework, or where a project specification calls for bolted, gasketed joints rather than solvent-welded or threaded ends. The design keeps overall face-to-face length shorter than a comparable true union flanged valve, saving space on crowded skids, and it still delivers bubble-tight, quarter-turn shutoff through a floating ball and PTFE seat arrangement.
A bolted flange connection suits systems already built around flanged pipe spools, tanks, and manifolds, and projects that call for gasketed rather than solvent-welded joints.
Body material determines chemical compatibility and temperature range; the flange dimensions themselves follow the standard selected, independent of material.
| Material | Temperature Range | Typical Strengths | Common Use |
| PVC-U | 0°C to 60°C | Broad acid and alkali resistance, economical, rigid flange face | General water treatment, tank isolation, utility headers |
| CPVC | 0°C to 90°C | Higher temperature ceiling than PVC-U with similar chemical resistance | Hot process water, elevated-temperature chemical lines |
| PP | 0°C to 80°C | Good solvent and acid/base resistance, lighter than PVC-U | Dosing manifolds, plating line headers, general process piping |
| Item | Description |
| Valve Type | Two-way one-piece flanged ball valve |
| Body Material | PVC-U, CPVC, PP |
| Ball Material | PVC-U, CPVC, PP (matching body material) |
| Seat Material | PTFE / reinforced PTFE |
| Seal Material | EPDM / FPM (Viton) |
| Size Range | DN15 – DN150 (1/2 inch – 6 inch) |
| End Connection | Integral flange to ANSI, DIN, or JIS pattern |
| Working Pressure | Up to 150 psi (10 bar) at 20°C, rating decreases with temperature |
| Working Temperature | 0°C to 90°C, depending on material selected |
| Sealing Performance | Bubble-tight (zero-leakage) shutoff |
| Operation | Manual lever standard; ISO 5211 pad for actuator mounting |
| Face-to-Face | Shorter than equivalent true union flanged valve |
Both styles bolt into a flanged line, but they differ in how the valve is serviced and how compact the installed footprint is.
| Factor | One Piece Flange Valve | True Union Flanged Valve |
| Body Joints | None between the two flange faces — single molded body | Union nuts or bolted couplings add extra sealed joints |
| Face-to-Face Length | Shorter, saving space on tight skids | Longer to accommodate union hardware |
| In-Line Serviceability | Valve must be unbolted from the flanges to service internals | Ball and seats can be removed without unbolting the flanges |
| Leak Paths | Fewer joints, lower overall leak risk | Additional gasketed joints at the union |
| Typical Use | Fixed installations with infrequent valve removal | Lines needing frequent valve removal for cleaning or swap-out |
| Cost | Generally lower due to simpler molding | Slightly higher for the added union hardware |
The molded body carries the flange faces on both ends, with the ball, seats, and stem assembly housed in the single-piece shell.
A defined inspection sequence confirms flange dimensions, sealing performance, and body integrity before packing.
The same ISO 5211 mounting pad is molded into the top of the body, so a manual lever can later be replaced with an actuator without changing the valve.
| Operation Type | Best Suited For | Key Characteristics |
| Manual Lever | Local, infrequent on/off duty on flanged headers | Lowest cost, no power source needed |
| Pneumatic Actuator | Automated flanged manifolds with compressed air available | Fast quarter-turn cycling for batch or sequencing control |
| Electric Actuator | Remote-controlled or monitored flanged isolation points | 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, with the balance settled before shipment.
Shipping: Sea freight (FCL/LCL) for bulk flanged-valve orders, air freight for urgent shipments, and courier for samples. Valves ship in wooden crates with flange faces protected by cover plates.
Delivery: Shipment from the nearest available port or airport, with FOB, CIF, or EXW terms available 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 flanged PVC-U body with a flexible di
Overview A free-moving ball that seals the line
Overview Union connections on both ends for full
Overview PVC-U shutoff with a removable true uni
Overview A reinforced body engineered for the up
Overview Built for corrosive and high-purity flu
Overview A space-saving body for tight skids and
Overview A dual-connection PVC valve with both t
Overview Motor-driven shutoff for remote, wired
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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
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