检测第二止回阀的密封性。
止回阀是自动运行的装置。
目的：检测止回阀2号对于回流的密封性。
Purpose: To test check valve No. 2 for tightness against reverse flow.
目的：检测1号止回阀对于回流的密封性。
Purpose: To test valve No. 1 for tightness against reverse flow.
止回阀最适用于低速或中速流体应用场合。
Check valves are best suited for low to moderate velocity applications.
如果水从排气口持续滴漏，则第二止回阀泄漏。
If water drips continuously from vent, second check is leaking.
截流止回阀最适用于低流速或中流速应用环境。
Stop-check valves are best suited for low to moderate velocity applications.
应当注意，出口止回阀不能装反或出现卡死现象。
It should be noted that the outlet check valve cannot be installed backwards or stuck.
翻转式阀瓣止回阀由圆柱形外壳及转动圆盘阀瓣构成。
Tilting disc Check Valves consist of a cylindrical housing, with a pivoted circular disc.
旋启式止回阀用于防止水平管路或垂直管路的流体倒流。
Swing check valves are used to prevent reversal of flow in horizontal or vertical pipe lines.
系列719双止回阀总成应该安装在每个标注的位置上。
Series 719 Double Check Valve Assembly shall be installed at each noted location.
当阀门下游一侧出现压力时，第二止回阀必须是无滴漏。
Second check must be drip tight when pressure is applied to downstream side of valve.
截止阀结构的止回阀应该用于水平管道，阀杆垂直朝上。
Globe pattern check valves should be used in horizontal pipe runs with the stem straight up.
止回阀与安全阀在齿轮泵的输出管路上最好安装一个止回阀。
Check valve and relief valve on the output of the gear pump tube had better install a check valve.
止回阀应该安装在距离其他设备，如泵和压缩机等，尽可能远的地方。
Check valves should be located as far away from equipment such as pumps and compressors as possible.
升降式止回阀使用一个可承受弹簧载荷的轻量阀瓣，阀瓣的升程不高。
Lift check valve with a spring load can withstand light valve flap, flap valve lift is not high.
控制供应管道的水压。在总成的上游安装一个软阀座，弹簧负载止回阀。
Control supply line water pressure. install a soft seated spring loaded check valve upstream of the assembly.
TK - DL可以检测压力真空断路阀，减压防回流阀或双止回阀总成。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
从模块适配器上拆卸第一止回阀模块，对于第二止回阀模块重复上列步骤。
Remove first check module from module adaptor, and repeat above procedure with second check module.
在这种位置，安全阀位于第一止回阀下面，使得这个区能够通过安全阀出口排放。
This positions the relief valve below the first check valve, enabling the zone to drain through the relief valve outlet.
每个止回阀应该都配置中心和边缘引导，确保可更换阀座密封和最小的局部磨损。
Each check valve shall be both center and edge-guided to ensure repeatable seating and minimize localized wear.
止回阀的撞击现象，是由于在流体倒流之前，阀门的阀瓣没有到达关闭位置造成的。
Slamming of check valves is the result of failure of the valve disc to reach its closed position before the fluid flow reversal.
尼伯科铸铁阀体止回阀可以安装在水平管线或流向朝上的垂直管线中的任何位置上。
NIBCO Iron Body Check Valves may be installed in both horizontal and vertical lines with upward flow or in any intermediate position.
止回阀与蝶阀的连接是经常发生的事，通常需要在这两种阀门之间加上一节短短的阀槽。
Check valve and butterfly valve combinations are very popular; normally a short spool piece is required between the valves.
通过用漂浮的PP球更换标准球，重力球形止回阀可以改造为适用于空气或气体排气口。
Gravity ball check may be converted for air or gas venting by replacement of standard ball with floater PP ball.
这使得我们的旋启式止回阀无论安装在水平管道还是垂直管道上，都能够实现完全的关闭。
This allows our swing check valve to close completely even when installed in a horizontal pipe run with no flow.
这使得我们的旋启式止回阀无论安装在水平管道还是垂直管道上，都能够实现完全的关闭。
This allows our swing check valve to close completely even when installed in a horizontal pipe run with no flow.
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