Our History

Wenzhou Longzhu Industrial Co.,Ltd. was founded in 1986 and with 27 years' hard working, it has been developed into a comprehensive enterprise focusing on researching, developing, manufacturing, as well as selling valve castings and mechanical accessories. With a capital assert of over 85 millions Yuan, the company covers a construction area of more than 15800m2 and holds over 280 staffs and 16 engineers. Now it is one of the largest foundries in Wenzhou, Zhejiang Province. The traffic is very convenient. It is 5 kilometers away from wenzhou longwan international Airport, 12 Kilometers away from Wenzhou Railway Station and 3 Kilometers away from LongWan Dock.


Our main products are valve castings and mechanical accessories. The annual output of the cast steel is over 5000 tons with maximum unit weight is 3.5 tons per each, and cast iron is over 1000 tons with maximum unit weight is 4 tons per each. The type of steels mainly contains carbon steel, low temperature steel, alloy steel, stainless steel, duplex steel and special using steel. The cast iron contains alloy cast iron, high-chromium cast iron and so on.

The company got verified in the DIN EN ISO9001 for the quality system certification in 1999. In 2002,the company got verified of the European Directive CE (PED) that based on the reliable quality, passed the TS certification in 2010.

Our main manufacturing facilities are as follows: resin sand producing streamline, medium-frequency induction furnaces (4 furnaces up to 1 ton, 2 up to 1.5 tons, 1 up to 5 tons), four heat treatment electric furnaces (the capacity of them are 15 tons, 10 tons, 7 tons, 3 tons respectively). We also have following main equipments for inspection: direct-reading spectrometers, radiographic testing machine, low temperature impact testing machine, Brinell hardness testing machine, Ultrasonic machine for wall thickness, magnetic particle testing machine, CMM, metallurgical microscope, molten steel thermocouple thermometer, hydraulic pressure equipment etc. Our main machining equipments for own machining shop are vertical lathe, horizontal lathe, boring machine, CNC, etc.

Most of the castings are mainly exported to the Unites States, Canada, England, Switzerland, Indian and all over the country.