原文：
      该标准适用公称压力PN?4.0MPa，公称通径DN?4000mm，工作温度不大于80℃，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阀。

 　　标准中技术要求如下：

　　1法兰连接缓闭止回阀的结构长度尺寸应按球阀GB/T12221的规定或按用户约定，蝶形止回阀开启时，蝶板伸出长度不应影响使用。

　　2法兰连接尺寸、密封面型式应符合GB/T17241.6、GB/T17241.7或GB/T9112的规定。?

　　3阀体的最小壁厚应符合GB/T12236、GB/T12238或GB/T13932标准的规定。?

 　　4材料　　4.1缓闭止回阀的阀体、阀盖、阀瓣(蝶板)、阀轴等主要零件材料应按GB/T12236、GB/T12238或GB/T13932的规定。　　4.2缓闭装置阻尼活塞缸的材料应满足系统压力的要求，活塞、活塞杆的表面应镀硬铬，活塞、活塞杆密封圈应采用栈晴橡胶等耐油材料。　　4.3给水用缓闭止回阀阀体内腔及其他与水接触的执行器与附件 金属零件所采用的防腐涂料和橡胶密封件应无毒无味。?

　　5缓闭止回阀的关闭过程应分速闭及缓闭两个阶段，蝶阀其缓闭时间应可调。?

　　6缓闭止回阀的逆止阀瓣的缓闭开度即缓闭活塞伸出长度应全程可调。?

　　7缓闭止回阀的逆止阀瓣(蝶板)应启闭灵活，无卡阻现象。?

　　8缓闭装置中的阻尼活塞必须动作灵敏，当逆上阀瓣(蝶板)开启时能自动迅速伸出到预定工作位置，当逆止阀瓣(蝶板)关闭到缓闭位置时能起有效的缓闭作用。缓闭装置中的阻尼活塞缸的容量应与使用的调节阀等匹配，避免阻尼活塞缸和管道的力过高，达到可调和消锤的目的。?

　9外阻尼缓闭止回阀、液控蝶形止回阀的缓闭装置闸阀应附设监控阻尼介质液位的机构。?

　　10自阻尼缓闭回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。?

　　11液控蝶形止回阀、蝶形缓闭止回阀应设有正确显示蝶板开度位置的指示机构。?

　　12液控蝶形止回阀应设置重锤或蓄能器作为附加力源，通用阀门以备断电时自动关闭阀门。?

　　13缓闭装置有关连接、传动和支撑件应有足够的强度和刚性。?

　14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。液动装置装配后，应进行各项参数性能试验和调整，使其符合阀门"缓闭"的设计要求。?

　　15缓闭止回阀的外部漆层、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。

“ With slow closing check valve to the water conditions General ”是由中国止回阀网提供的阀门新闻，译文仅供参考。另外，中国止回阀网还提供相关产品搜索： 消声止回阀、 微阻缓闭止回阀、 蝶型止回阀、 铜止回阀、 更多止回阀产品等。

译文：
       The standard for nominal pressure PN? 4.0MPa, nominal diameter DN? 4000mm, working temperature is less than 80 ℃, the working medium for the drinking water, raw water, industrial circulating water, seawater, sewage and other non-corrosive medium flange The slow closing check valve. Standard technical requirements are as follows: A slow closing valve flange structure of length dimensions should be GB/T12221 requirement or by the user agreement, butterfly valve is opened, the disc should not affect the use of extended Bellows Seal Valveslength. 2, flange size, sealing surface type should be consistent with GB/T17241.6, GB/T17241.7 or GB/T9112 requirements. ? The minimum wall thickness of 3 body should meet GB/T12236, GB/T12238 or GB/T13932 standards. ? 4 Materials 4.1 Check Valves relief valves, valve cover, valve valve (disc), the valve shaft and other major parts materials should be GB/T12236, GB/T12238 or GB/T13932 requirements. 4.2 slow close device damping piston-cylinder pressure of the material should meet the requirements of the system, piston, piston rod surface should be hard chromium plated piston, piston rod seals should be clear and rubber, oil-resistant material stack. 4.3 Water body cavity with a slow closing check valve and other metal parts in contact with the water used in theCheck Valves anticorrosion coating and rubber seals should be non-toxic and tasteless. ? 5 slow closing valve closure process should be closed and the slow speed of closure points in two stages, the slow closing time should be adjustable. ? 6 Slow Check Valves Check Valves relief valve that is slowly opening closed out the Pistons closed the whole length should be adjustable. ? 7 relief valve check valve Check ValvesButterfly Valves (Butterfly board) should open and close a flexible, non-jamming phenomenon. ? 8 slow closure device is sensitive to the damping piston, when the reverse on the disc (the disc) to open automatically when the work rapidly extended to a predetermined position, when the check valve flap (Butterfly board) close to the closed position can play slow effective role of slow closed. Slow closing piston-cylinder unit in the damping capacity should be matched using the control valve, piston cylinder and pipes to prevent damping force is too high to achieve the purpose hammer adjustable and consumption. ? 9 External damping relief valve closed, fluid control butterfly valve of the slow closure device should be attached to control the damping medium level of the organization. ? 10 slow close back from the damping Plug Valvesvalve does not allow the raw water with solid particles, water and other relief directly into the closure device to prevent blockage or damage seals. ? 11 fluid control butterfly valve, butterfly valve closure delay there should be displayed correctly the location of the disc opening instructions institutions. ? 12 butterfly valve hydraulic control should be set as an additional hammer or accumulator power source, to prepare for power outages automatically close the valve. ? 13 slow close device the connection, transmission and supporting documents should have sufficient strength and rigidity. ? 14 Hydraulic Equipment: Standard hydraulic parts and electrical components should be used and reliable quality,Safety Valves good performance, long life products and their related standards should be tested and qualified before using. After assembly of hydraulic equipment, the parameters should be carried out performance testing and adjusting it to the valve "slow close" the design requirements. ? 15 slow close valve external paint color should be uniform, smooth surface should and should not have scars, sagging, blistering and obvious crack.

原文来源：http://www.1zhihuifa.com/

2010-07-14 06:40

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