The two-piece threaded ball valve is an instrument-type valve used in industrial pipeline systems for fully open and fully closed control of media. It consists of a valve body and a bonnet, and its opening and closing function is achieved by rotating the ball 90°. Compared to traditional one-piece ball valves, its bonnet structure improves sealing performance and significantly reduces the risk of leakage.
This valve has a nominal pressure range of 1.6-6.4 MPa and an applicable temperature range of -20℃ to 350℃. It can transport water, oil, gas, and corrosive liquids. The valve body can be made of stainless steel, carbon steel, etc., and the seals are commonly made of PTFE or elastic materials. It supports various thread standards such as G/NPT/BSPT and can be expanded to include butt welding and socket welding connections. Some models are equipped with a reverse-sealing stem and ISO standard brackets to prevent abnormal pressure surges and adapt to special installation requirements.
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2-Piece Threaded Ball Valve Structure and Features
Two-Piece Valve Body Design
Structure: The valve body consists of an upper and lower section connected by bolts or clips, with the ball and seat held in between.
Easy Assembly and Disassembly: The valve body can be separated by loosening the connecting bolts without disassembling the pipeline, facilitating internal maintenance or seal replacement.
Sealing Performance: O-rings or metal gaskets are used at the valve body connections to ensure no leakage.
Threaded Connection Methods
Internal Thread (G/NPT/BSPP): Suitable for small to medium-sized pipelines; directly screwed into the pipeline for quick installation.
External Thread (BSPT/NPT): Adaptable to special pipeline designs, offering high flexibility.
Dual Thread Option: Some models support one internal thread and one external thread, providing greater adaptability.
Core Components of the Ball Valve
Ball: Hollow design with a surface hardening treatment (such as tungsten carbide coating), wear-resistant and corrosion-resistant.
Valve seat: Hard metal seal (STL alloy) or soft-hard composite seal (metal + PTFE), adaptable to different media and operating conditions.
Valve stem: Anti-blowout design, equipped with anti-static device to ensure safety under high pressure.
2 piece threaded ball valve Performance Advantages
Quick Disassembly and Maintenance
No Pipe Disconnection Required: The two-piece valve body can be separated simply by loosening the valve body connecting bolts, allowing direct removal of the ball and seat for cleaning or replacement.
Reduced Maintenance Costs: Minimizes downtime and avoids additional workload caused by disassembling pipelines.
High Sealing Performance and Pressure Resistance
Sealing Performance: Metal hard seal or soft-hard composite seal, leakage rate meets API 598 standard.
Pressure Resistance: Design pressure up to PN40 (4MPa) to PN100 (10MPa), meeting the needs of medium and high pressure conditions.
Flexible Operation and Wide Applicability
Manual Operation: Handle or gearbox operation, suitable for low-frequency or manual control scenarios.
Automation Compatibility: Can be equipped with electric or pneumatic actuators for remote control.
Media Compatibility: Water, steam, oil, natural gas, acid and alkali solutions, etc.
Compact Structure and Lightweight Design
Small Size: The two-piece design reduces valve body size, suitable for space-constrained installation environments.
Lightweight: Compared to three-piece or flanged ball valves, it is lighter and easier to handle and install.
2 piece threaded ball valve Application Areas
Petrochemical Industry
Controlling the cutting off and distribution of media during oil and gas extraction, transportation, and storage; adaptable to high temperature, high pressure, and corrosive conditions.
Water Treatment
Used in urban water supply and drainage and sewage treatment systems to regulate water flow direction and prevent sewage backflow.
Metallurgical Industry
Transporting high-temperature molten metal, cooling water, and other media; high temperature resistant and wear-resistant.
Light Industry and Paper Manufacturing
Controlling viscous fluids such as pulp and chemicals; the full-bore spherical design reduces clogging.
Refrigeration and Air Conditioning
Regulating refrigerant flow; adaptable to low-temperature environments (some models withstand temperatures below -20℃).
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