The water supply and drainage with slow close check pneumatic valve general technical conditions'

approval of the ministry of construction on (date) (month) (year) has released the water supply and drainage with slow close check pneumatic valve general technical conditions '( CJ/T- Urban construction industry standards. And requirements on (date) (month) (year).
现将标准有关内容介绍如下：
 该标准适用公称压力PN. MPa，公称通径DNmm，工作温度不大于℃，工作介质为饮用水、原水、工业循环水、海水、污水及其他非腐蚀性介质的法兰连接的缓闭止回气动阀。
 标准中技术要求如下：
 法兰连接缓闭止回气动阀的结构长度尺寸应按GB/T的规定或按用户约定，蝶形止回气动阀开启时，蝶板伸出长度不应影响使用。 
法兰连接尺寸、密封面型式应符合GB/T. ,GB / T。 Or the provisions of the GB/T. 
气动阀体的最小壁厚应符合GB/T、GB/T或GB/T标准的规定。 
材料
. Slowly-closing check pneumatic valve pneumatic valve, pneumatic valve cover, pneumatic disc ( Butterfly plate, the pneumatic valve shaft and other main parts material should be in accordance with the GB, GB/T/T or the provisions of GB/T.
. Slowly-closing damping device of piston cylinder material should meet the requirements of system pressure, the surface of the piston and piston rod should be hard chrome plating, piston and piston rod sealing ring stack should be adopted for the fine rubber oil resistant material. 
. Water use slowly-closing check pneumatic valve pneumatic valve body cavity and other metal parts in contact with the water anticorrosive coating and rubber seals shall be adopted by the non-toxic tasteless. 
缓闭止回气动阀的关闭过程应分速闭及缓闭两个阶段，其缓闭时间应可调。 
缓闭止回气动阀的逆止气动阀瓣的缓闭开度即缓闭活塞伸出长度应全程可调。 
缓闭止回气动阀的逆止气动阀瓣( Butterfly plate should be opening and closing flexible, no jam phenomenon. 
缓闭装置中的阻尼活塞必须动作灵敏，当逆上气动阀瓣( The butterfly plate opens automatically reached out to the scheduled work position quickly, when the non-return pneumatic disc ( Butterfly plate close to the gradual closing position can effective slowly-closing role. Slowly-closing device of the damping capacity of piston cylinder should be matching with the use of pneumatic valve adjustment, avoid damping piston cylinder and the pipe is too high, the force can reconcile of hammer. 
外阻尼缓闭止回气动阀、液控蝶形止回气动阀的缓闭装置应附设监控阻尼介质液位的机构。 
自阻尼缓闭回气动阀不允许带有固体颗粒的原水、污水等直接进入缓闭装置内，以免堵塞或损伤密封件。 
液控蝶形止回气动阀、蝶形缓闭止回气动阀应设有正确显示蝶板开度位置的指示机构。 
液控蝶形止回气动阀应设置重锤或蓄能器作为附加力源，以备断电时自动关闭气动阀门。 
缓闭装置有关连接、传动和支撑件应有足够的强度和刚性。 
液动装置：标准液压件和电气部件应选用质量可靠、性能良好、寿命长的产品，并应按各自相关标准的规定进行试验，合格后方能使用。 After hydraulic device assembly, should carry on the performance testing and adjusting the parameters, make it accord with the design of the pneumatic valve 'slowly-closing' requirements. 
缓闭止回气动阀的外部漆层、色泽应均匀一致，外表应光滑平整，不应有伤痕、流挂、起泡和明显裂纹等缺陷。
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