止回阀及其应用

由此快速通道进入阀门产品分类导航，了解 : 针型阀(针阀) 仪表阀门截止阀安全阀减压阀等系列阀门的产品、型号、技术与支持，上海丰企阀门有限公司的高品质产品与优质服务，助您的工程更为精确、安全、高效与稳定。欢迎选购！

原文：
止回阀是用来防止管道或设备中介质倒流的一种阀厂。它利用流体的动能而开启。在供热系统中，止回阀常安装在泵的出口、以及其它不允许流体反向流动的地方。选择合适的止回阀型式对进行水锤防护有很大的影响，例如泵站中大量的水锤事故是与泵出口装设的止回问有关的。事故停泵后水流通过京开始倒流，在倒泄水流的作用下，止回阀迅速关闭，如果止回阀由于故障或支座摩阻及其惯性的影响，止回阀有可能滞后于开始倒流的时间，即在倒流量增至一定值，甚至在最大倒流量的瞬间迅速关闭，则能在止回阀处产生非常大的压力。止回阀阀瓣在流速为零时关闭完毕是关闭的最佳状态，要在流速为零时完成阀瓣关闭是不太可能的。一般认为，只要在零流量附近关闭完毕就是正常的。在热水供热系统中，为了减小事故停泵水锤，可以在循环水泵的压水管和吸水管之间设置一带止回阀的泄压旁通管。在循环水泵运行时，由于水泵出水侧水压高于吸水侧的水压，止回阀呈关闭状态。当突然停泵的瞬间，泵出水侧压力急剧降低，而吸水侧压力则大幅度增高，在此压差作用下，循环水泵吸水侧管路中的水即推开止回阀至泵出水侧的管网系统，从而降低了吸水侧管网中压力增高的幅度；减少和防止了水锤的危害。装置在泄压旁通管上的止回阀应选用阻力较小、开启灵活的产品。泄压旁通管的管径越大对减小水锤越有力，可以根据规定的压力界限，通过瞬变计算，确定经济的管径。

“Check Valve works”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：旋启式止回阀、升降式止回阀、对夹式止回阀、消声止回阀、微阻缓闭止回阀等。

译文：
Check valve and its application The check valve is used to prevent the media back in the pipeline or equipment of a valve factory. It uses the kinetic energy of the fluid and open. In the heating system, the check valve is often installed on the pump exports, and the other does not allow fluid to the reverse flow of the place. Select the appropriate check valve type has a great influence on water hammer protection, for example, return a lot of water hammer accident in the pumping station is installed with the pump outlet to ask about. Accident stopping the pump flow through the Beijing back quickly shut down the role of water down drain, check valve, check valve due to failure or bearing friction and inertia effects, check valve may be lagging behind in the beginning back in time, that the down flow increased to a certain value, even in the moment of maximum down traffic quickly closed in the non-return valve at the very large pressure. Check valve valve flow rate is zero, turn off the completion of the closed state to the flow rate is zero valve valve is unlikely. Is generally believed that the shut down is completed near the zero flow is normal. Water hammer in order to reduce the accident in the hot water heating system can be set between the circulating pump, pressure pipes and suction pipe along the non-return valve, pressure relief bypass pipe. Circulating pump runtime, pump the water side of the water pressure is higher than the suction side of the water pressure, check valve was closed. The moment when a sudden stop the pump, pump the water side pressure is drastically reduced, the suction side pressure is substantially increased, this pressure difference, the circulating pump suction side piping of water that is pushed open the check valve to pump the water side systems, and thereby reducing the magnitude of the increased pressure in the suction side pipe network; to reduce and prevent the hazard of water hammer. Device in the non-return valve on the pressure relief bypass pipe should be used in resistance small, open and flexible product. Pressure relief bypass pipe of larger diameter to reduce the water hammer is more powerful, according to the prescribed pressure boundaries by transient calculations to determine the diameter of the economy.

更多新闻：

原文来源：http://www.1zhihuifa.com/

2012-02-03 08:09