ZHONGZI VALVE check valves

ZHONGZI VALVE.Founded in 1935, ZHONGZI VALVE has a history spanning more than 80 years. Headquartered in Shanghai, China, the company is a valve manufacturer with a strong technical foundation and large-scale manufacturing capabilities. The company currently employs 378 people, including 82 technical professionals—among whom are 9 senior engineers. It has established a valve design center, a machining center, and a comprehensive testing system, possessing end-to-end capabilities ranging from R&D and manufacturing to testing. ZHONGZI VALVE offers products with various actuation methods, including manual, electric, and pneumatic. Valve sizes range from 6 mm to 4,000 mm (API sizes 1/4″ to 40″), with pressure ratings from 0.1 MPa to 32 MPa (150 LB to 2,500 LB) and operating temperatures ranging from -70°C to 540°C. Valve body materials include brass, cast iron, carbon steel, alloy steel, and stainless steel. Suitable for media such as oil, water, steam, and natural gas, our products are widely used in the petrochemical, fertilizer, steel, power plant, oilfield, city gas, construction, paper, and fire protection industries. The company also possesses deep technical expertise in the field of vacuum valves, with product nominal diameters ranging from 0.8 mm to 1200 mm, with a leakage rate range of 6.7×10⁻² to 1.3×10⁻⁷ Pa·L/s, an operating temperature range of -30°C to +400°C, and a pressure range of 1×10⁵ to 1×10⁻⁷ Pa. These valves are widely used in high-tech fields such as aerospace, electronics, machinery, pharmaceuticals, refrigeration, energy, environmental protection, food processing, and scientific research. ZHONGZI VALVE obtained ISO 9001 international quality system certification in 1998 and completed the transition to ISO 9001:2000 certification in 2002. The company has also successively obtained National Pressure Vessel Safety Registration (AZ) certification and Special Equipment Manufacturing License (TS) certification, establishing a comprehensive and standardized quality and safety management system. Major product lines include: gate valves, butterfly valves, globe valves, ball valves, check valves, piston valves, plug valves, diaphragm valves, control valves, balancing valves, vacuum solenoid valves, vacuum butterfly valves, vacuum diaphragm valves, vacuum butterfly valves, vacuum ball valves, vacuum fine-tuning valves, vacuum regulating valves, ultra-high vacuum slide valves, and ultra-high vacuum butterfly valves. Leveraging its long-standing heritage, strong technical team, extensive product portfolio, and rigorous quality certifications, ZHONGZI VALVE is committed to providing comprehensive, high-performance, and highly reliable valve solutions for both conventional industrial and high-tech sectors, continuously contributing to national infrastructure and technological development.