drive mode can be divided into several kinds, a kind of form for manual, this class is one of the most common valve, manual drive, the second for the electric drive, electric needs in the valve itself in adding an electric actuator, electric actuator voltage to control the switch, and the third for gas drive, gas drive is made up of pneumatic actuator input source, the use of air pressure to open the cylinder body, automatic air switch. A, the classification of valve drive mode according to the driving mechanism of the movement way, in the valve actuator stroke and stroke two kinds. According to the drive structure, manual valve actuation device is divided into: the valve drive drivers handle hand wheel ( Including through intermediate gear reduction) 弹簧杠杆式电动驱动电磁式电动机式气动驱动1、隔膜式2、气缸式① 活塞气缸式② 活塞齿条式③ 活塞连杆式④ 活塞拔叉式⑤ 活塞螺杆式3、叶片式4、空气发动机式5、薄膜和棘轮组合式液动驱动液压缸式液压马达式联动驱动电液联动二、各类阀门驱动装置的特点特点电动装置优点1、适用性较强，不受环境温度影响2、输出转矩范围广3、控制方便，能自由地采用直流、交流、短波、脉冲等各种信号，适于放大、记忆、逻辑判断和计算等工作4、可实现超小型化5、具有机械自锁性6、安装方便7、维护检修方便缺点1、结构复杂2、机械效率低，一般只有25%～60%3、输出转速不能太低或太高4、易受电源电压、频率变化的影响液动装置优点1、结构简单、紧凑、体积小2、输出力大3、容易获得低速或高速，能无级变速4、能远距离自动控制5、由于液压油的黏性而效率较高，有自润滑性能和防锈性能缺点1、油温变化引起油粘度的变化2、液压元件和管道易渗漏3、陪管，维修不方便4、不适于对于信号进行各种运算气动装置优点1、结构简单2、气源容易获得3、能得到较高的开关速度4、可安装调速器，使开关速度按需要进行调整5、气体压缩性大，关闭时有弹性缺点1、与液动装置相比结构较大，不适于大口径高压力的阀门2、因气体有压缩性，所以速度不易均匀三、阀门驱动方式的选择阀门驱动方式的选择依据是：阀门的形式、规格与结构。 The Industrial Valves opening and closing torque ( Pipeline pressure, maximum differential pressure across the valve) , thrust. The highest temperature and fluid. Use way and use. Opening and closing speed and time. Stem diameter, pitch, direction of rotation. Connection mode. Power supply parameters: the number of electric power supply voltage, phase, frequency; Pneumatic air pressure; Hydraulic source of hydraulic pressure. Special considerations: low temperature, anti-corrosion, explosion-proof, waterproof, fire prevention, radiation protection, etc. ( Electric ball valves, electric valve, electric gate valves)
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