Under pressure to ensure the valve setting exact premise, "flexible valve" structure allows the valve reaches the set pressure at operating pressure over 96% are still without leakage. Through our results Crosby spring-loaded safety valve setting check statistics show that the flexible valve flap valve can be pre-discharge point of 98.5% or even 99% of the set pressure, Xi'an hydraulic maintenance, and accurate take-off, the back seat altogether, no leakage. Due to the development of modern technology, hydraulic maintenance of telephone, electronic technology plays in signal processing capability and speed aspects of great advantage, hydraulic repair warranty calls, and hydraulic and power transmission characteristics of the respective strengths in terms of the power components. Therefore, where there is hydraulic maintenance, in addition to the now ubiquitous "electronic nerve + hydraulic muscle" this mode, both the power flow in the composite transmission also has many successful examples, such as: the frequency or DC drive motors and Efficient, variable flow hydraulic oil source low ripple constant pump constituted by the integrated installation of electric pumps - hydraulic or electro-hydraulic low speed high torque hydraulic motor constitute an execution unit, and hybrid drive systems and other industrial vehicles. Hydraulic maintenance technicians, Xi'an-through hydraulic maintenance (certification), Xi'an, Xi'an Chengtong hydraulic maintenance hydraulic maintenance Limited. Xi'an-hydraulic-repair Ltd. (www.xayeya.com) (www.xayeya.com) is Xi'an, industrial maintenance, installation of leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum Limits to meet customer needs. Xi'an Chengtong hydraulic service leadership with the staff warmly welcome all inquiries negotiations to create Xi'an Chengtong hydraulic service better future.