LZHPV butterfly valves.LZHPV was founded in 1938 and moved from Shenyang to Lanzhou in 1966 for the “Third Line Construction”. It is China's key large-scale valve enterprises and the production of special valves R & D base. It is the only national high-tech enterprise in Northwest China that integrates the development, design, casting (forging) manufacturing and sales of high-temperature, high-pressure, high-alloy, low-temperature and large-diameter valves (referred to as “three-high, three-super, one big”). Valves are widely used in petroleum, chemical, coal, natural gas, metallurgy, aerospace, military and other industries. The main products include: one-piece double-valve globe valves, ultra-high pressure valves, ball valves, cryogenic valves, butterfly valves, special pumping check valves for power plants, special valves for ultra-high temperatures, and sequence control valves for delayed coking plants.