Zhejiang Linjia Changlong Valve Casting Co., Ltd. was founded in December 2005 and is located in Gaohu Town, Qingtian County, Zhejiang Province. The company covers an area of 18,000 square meters with a total building area of 12,300 square meters. It has a registered capital of 10 million yuan and total investment exceeding 40 million yuan. Currently, it employs 160 staff members, including 2 casting engineers, 18 R&D technicians, 4 senior and intermediate inspectors and 14 quality control personnel.

The company obtained ISO9001, CE, AD2000, UKAS and NORSOK M650 4A/5A certifications issued by Lloyd's Register of the United Kingdom starting from 2010. It was accredited as a national high-tech enterprise in 2014, passed ISO14001 and ISO45001 certifications in 2018, and was rated as Zhejiang Innovative Small and Medium-sized Enterprise and Specialized, Refined, Unique and Innovative Small and Medium-sized Enterprise in 2023.

Equipped with advanced production equipment and technologies imported from Taiwan, as well as testing devices sourced from Germany and Japan, the company’s core production facilities include 7 dual-station medium-temperature wax injection machines, 6 low-temperature wax injectors, 1 automatic wax processing unit, 4 medium-frequency furnaces, 9 roasting furnaces, 13 shot blasting machines, 4 heat treatment furnaces, 14 electric welding machines, 6 CNC lathes, 5 conventional lathes and 3 supporting 1000KVA transformers.

Major testing equipment consists of 2 direct-reading spectrometers, 1 mechanical testing machine, 1 set of low-temperature impact test equipment, 2 hardness testers, 2 thickness gauges, 1 ultrasonic flaw detector, 1 magnetic particle flaw detector and 1 set of metallographic testing equipment.

The company specializes in precision valve castings such as ball valves, gate valves, globe valves, check valves, butterfly valves, control valves, plug valves and diaphragm valves. The maximum specification reaches 16 inches for flange-type valves and 28 inches for wafer-type valves, with a maximum pressure rating of Class 900 and maximum single product weight of 350 kilograms. The annual output stands at 2,000 tons of composite-process valve castings and 1,800 tons of silica sol-process valve castings.

Its products are widely applied in petroleum, chemical, pharmaceutical, military and nuclear power industries. Ninety percent of products are sold domestically in Jiangsu, Zhejiang and Shanghai regions, serving major clients including Supcon Fluid, Tunxi High Pressure, Sino-German Automatic Control, Shenjiang Valve, Shanghai No.5 Valve Factory, Lanzhou High Pressure and Fangzheng Valve. The remaining 10% are exported directly to Russia, Southeast Asia, Europe and America.

As a technology-oriented enterprise dedicated to R&D and production of investment casting products, the company has invested over 40 million yuan in research and development since 2010, launching more than 50 R&D projects and achieving nearly 50 technical outcomes covering petrochemical, chlorine-resistant, nuclear power valve castings, automobile exhaust manifold castings, electromagnetic pump housing and impeller castings. Nearly 40 patents have been applied for.

Committed to energy conservation and emission reduction, the enterprise is fitted with 18 bag dust collectors, a complete water curtain dust removal system and integrated water treatment facilities. Annual environmental protection expenditure exceeds one million yuan, ensuring wastewater and exhaust emissions fully comply with national standards.

Adhering strictly to quality management system standards, the enterprise has grown into one of the largest investment casting manufacturers in the local area over two decades. It enjoys widespread customer recognition, with product quality and technical strength ranking among the industry leaders.