Conventional maximum size
Standard caliber range:
The common caliber range of conventional stop valves is DN15 to DN50 (such as PP-R material stop valves);
In industrial scenarios, the maximum standard caliber of stop valves made of cast iron, cast steel or stainless steel can reach DN250 (about 10 inches).
Special application expansion:
In specific high-pressure or large-flow scenarios (such as petroleum and chemical pipelines), some stop valves can be customized to DN300 (about 12 inches), but comprehensive evaluation is required based on medium pressure, temperature and flow requirements.
Key factors in selection
Medium and working conditions:
High pressure (such as PN2.5MPa) or corrosive media (such as acid and alkali) require pressure-resistant and corrosion-resistant materials such as cast steel and stainless steel;
In high-temperature environments, attention should be paid to the thermal expansion coefficient of the valve body material to avoid seal failure.
Drive mode adaptation:
Large-diameter stop valves (DN≥50) usually need to be equipped with electric or pneumatic actuators to reduce manual operation torque.
Typical models and specifications
Cast steel flange stop valve (such as J41H-16C): suitable for DN50~DN250 diameter, pressure level Class 150~600;
Stainless steel thread stop valve (such as J11W-16P): suitable for DN15~DN50 small diameter pipelines, excellent corrosion resistance.
Summary: The maximum standard size of the stop valve is DN250 (about 10 inches), and special customized models can be expanded to DN300. When selecting, it is necessary to comprehensively evaluate the pressure, medium characteristics and installation conditions, and give priority to matching standard specifications to ensure system safety and economy.