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1·To introduce the structure, performance and design of the differential stop check valve.

介绍了差压式截止止回阀的结构、性能和设计要点。

2·When more than one boiler is connected to the main steam header, a stop check valve should be installed in the pipeline between each boiler and the header.

如果连接主蒸汽热水器的锅炉不止一个，则在每个锅炉与热水器之间的管路上都应该安装一个截止止回阀。

3·To introduce the structure, performance and design of the differential stop check valve. It has the features of novel design, small moment in operation and seal reliability.

介绍了差压式截止止回阀的结构、性能和设计要点。该阀操作力矩小，密封可靠，运行平稳。

4·The company mainly produces the products involving PP-R ball valve, anglevalve, stop valve, check valve and pipe fittings.

本公司主要生产PP-R球阀、角阀、截止阀、止回阀、管接头等产品。

5·Many applications require gate, globe and stop-check valves to use gearing to reduce the hand wheel rimpull and thus allow one man to manually seat or unseat the valve.

许多实际应用要求闸阀、截止阀和截止止回阀采用齿轮装置来降低手轮的边缘拉力，使得靠一个人的力量就可以启闭阀门。

6·Check valve before the valve is to use the pressure after poor hoist the automatic valve, it is the role of the media flows only in one direction, reverse and stop its flow.

止回阀是利用阀前阀后的压力差而自动启闭的阀门，它的作用是使介质只做一个方向的流动，而阻止其逆向流动。

7·The company mainly produces the products involving PP-R ball valve, angle valve, stop valve, check valve and pipe fittings.

本公司主要生产PP-R球阀、角阀、截止阀、止回阀、管接头等产品。

8·The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.

就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。

9·Welding type high pressure check valve is only allowing media to flow in one direction, and stop the flow direction.

焊接式高压单向阀只允许介质向一个方向流动，而且阻止方向流动。