Independent union joints on both ends of an industrial PVC-U, CPVC, or PP ball valve — full straight-out removal for fast service on process and utility lines.
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 Double Union Industrial Ball Valves Manufacturers and Custom Double Union Industrial 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
Double union industrial ball valves place a separate union nut and end connector on each side of the center body, so the valve can be broken apart at either joint without disturbing the pipe on the opposite side. Built in PVC-U, CPVC, or PP, the design keeps the same floating ball and PTFE seat arrangement used across the true union range, but is specified here for heavier industrial duty where valves are pulled for service, inspection, or replacement on a regular schedule.
Because both ends unscrew independently, the center section can be lifted straight out of the line for cleaning, seat replacement, or complete valve swap-out without needing to flex or reposition the adjoining pipework — a practical benefit on rigid industrial pipe runs where even small misalignment during valve removal can stress joints elsewhere in the system. This makes double union valves the standard specification for process lines where downtime for valve maintenance needs to be kept as short as possible.
Industrial lines that are serviced on a regular schedule benefit from a valve that can be pulled cleanly from the pipe without disturbing either side.
Body material determines chemical compatibility and temperature range; the double union joint design is common across all three materials.
| Material | Temperature Range | Typical Strengths | Common Use |
| PVC-U | 0°C to 60°C | Broad acid and alkali resistance, economical, widely available | General industrial water and chemical transfer |
| CPVC | 0°C to 95°C | Higher temperature tolerance than PVC-U with similar chemical resistance | Hot process water, elevated-temperature chemical lines |
| PP | 0°C to 90°C | Good resistance to solvents and a wide range of acids and bases, lightweight | Plating lines, dosing systems, general chemical processing |
| Item | Description |
| Valve Type | Two-way double union industrial ball valve |
| Body Material | PVC-U, CPVC, or PP |
| Ball Material | PVC-U, CPVC, or PP (matching body material) |
| Seat Material | PTFE / reinforced PTFE |
| Seal Material | EPDM / FPM (Viton) |
| Size Range | DN15 – DN100 (1/2 inch – 4 inch) |
| End Connection | Socket (solvent weld), threaded (BSP / NPT), or flanged |
| Working Pressure | Up to 230 psi (16 bar) at 20°C, rating decreases with temperature |
| Working Temperature | 0°C to 95°C, depending on material selected |
| Sealing Performance | Bubble-tight (zero-leakage) shutoff |
| Operation | Manual lever standard; ISO 5211 pad for actuator mounting |
| Union Design | Independent union nut and connector on each end |
Both offer some in-line serviceability; a double union body allows removal without repositioning the pipe on either side.
| Factor | Double Union Valve | Single-Union Valve |
| Union Joints | One independent union on each end | Union on one end only, fixed connection on the other |
| Removal Method | Lifts straight out without flexing either side of pipe | May require slight pipe flex to clear the fixed end |
| Best Use | Frequent service, rigid pipe runs, minimal downtime goals | Lines with lower service frequency or space constraints |
| Body Length | Longer to accommodate two union assemblies | Shorter, single union assembly only |
| Cost | Higher for the second union assembly | Lower than a full double union valve |
| Serviceability | Highest — full access from both directions | Good, but limited by the fixed-end connection |
Two independent union assemblies, one on each side of the center body, allow the valve to be removed from either direction.
Both union joints are inspected independently to confirm sealing performance and secure engagement on each side.
A standard ISO 5211 mounting pad allows the manual lever to be replaced with a pneumatic or electric actuator without changing the valve body.
| Operation Type | Best Suited For | Key Characteristics |
| Manual Lever | Local, infrequent on/off operation | Lowest cost, no power source required |
| Pneumatic Actuator | Fast-cycling or automated industrial lines | Quick response with compressed air available |
| Electric Actuator | Remote or precise on/off and modulating control | 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 Built for corrosive and high-purity flu
Overview CPVC shutoff engineered for hot water a
Overview A space-saving body for tight skids and
Overview Automatic backflow prevention in corros
Overview A free-moving ball that seals the line
Overview The full diaphragm valve range, from bo
Overview PVC-U shutoff with a removable true uni
Overview A dual-connection PVC valve with both t
Overview Motor-driven shutoff for remote, wired
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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 Double Union Industrial Ball Valves Manufacturers
