To measure displacement angle of a hose assembly, point one end of coupling "1" to a vertical position upward.The angle can then be measured from the centerline of coupling "1" in a clockwise direction ti the centerline of coupling "2".

Zhejiang Keerbo Hydraulic Co., Ltd. Is a high-tech enterprise, has two subsidiary companies and a branch: Xuzhou Dingyuan Machinery Co,. Ltd., Jiangxi Keerbo Hydraulic Co,. Ltd. and Chengdu Branch, founded in 1989, Keerbo is one of the largest-scale manufacturer in China which produce hydraulic hose assemblies, hydraulic hose fittings and adapters, as well as the agent for related fluid joint products. The two fluid joint production base covers an area of 120,000 m2, located in Yuhuan Zhejiang and Yichun Jiangxi. Totally annual output of 3 million hydraulic hose assemblies, 80 million of hydraulic fittings. The main clients are Sany Group, LiuGong, Caterpillar, XuGong (XCMG), Yuchai, Sunward, Chenggong, Shantui and other famous machinery factories in China. We export to more than 30 countries and districts including Europe, America, Australia, Asia and Africa.

With the idea of High level starting, High investment, Make unremitting endeavor for the localized production of core hydraulic parts for excavator, Keerbo Pump & Valve department was brought into being in March 2007. It dedicate to research develop and manufacture hydraulic multiple control valves and hydraulic piston pumps for excavator hydraulic dynamic system and control system. In 2008, pilot valve was produced in batches and supplied to many famous machinery factories, starting from 2009, the 22 ton series of excavator hydraulic multiple control valve and hydraulic piston pump has passed the quarry working condition test and been verified 14 months more than 2000 hours with good running and fluent motion, then 22 ton series of valve and pump was supplied to market in batches.

Company has passed ISO9001 quality management system certification in 2000, and obtained the hydraulic hoses and hose assemblies national license in 2006. Passed ISO14000 environmental management system and ISO18000 occupational health and safety management system certification in 2009. Government awards Keerbo brand with famous brand product and trademarks yearly. We can outshine in the market which is full of fierce competition, relying on the untiring endeavor of pursue the excellent quality and the competitive advantage of specialization and larger-scale. The staff of Keerbo, with the belief of "Sincerity Create Success, Cooperation Achieve Value ", strive for contributing to the development of fluid transmission and control system.