基本解释：双板对夹式止回阀
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Series774 Double Check Valve Assemblies are designed to prevent the reverse flow of polluted water from entering into the potable water system.系列747双止回阀总成用于防止污水回流进入饮用水系统中。
Series774 XDCDA Double Check Detector Assemblies are designed to prevent the reverse flow of polluted water from entering the potable water supply.系列747XDCDA双止回阀检测器总成用于防止污水回流进入饮用水系统中。
A Double Check Detector Assembly shall be installed on fire protection systems when connected to a potable water supply.当消防系统连接到饮用水供应系统时，应该安装一个双止回阀总成。
Watts dual check valves may be installed in either a vertical or a horizontal position.美国瓦茨双止回阀可以安装在垂直或水平位置上。
The bypass line shall consist of a meter, a small diameter double check assembly with test cocks and isolation valves.旁路管线应该由一个水表，配置测试旋塞和隔离阀的一个小直径双止回阀总成构成。
dual way check valve双向止回阀（双通单向阀）
Check Valve 1;Check Valve 2;Check Valve 3;Screw-down止回阀 1;止回阀 2;止回阀 3;旋拧阀
Seat discs shall be reversible to extend check valve life.阀座阀瓣应该是双向的，能够延长止回阀寿命。
Type of valve- gate, globe, check, etc.阀门种类：闸阀，截止阀，止回阀，蝶阀，球阀，等等。
check-valve mounting bracket止回阀(装置)托架
Double-door check valves have twin discs on a spring-loaded center shaft.双门止回阀在弹簧中心轴旁配置两个对称的阀瓣。
Now bring the check assembly through the check retaining wall.现在将止回阀通过止回阀护壁取出。
This is a gate valve (check valve, butterfly valve, cut-off valve, magnetic valve, remote valve, relief valve, throttle valve, cock).这是一个闸阀（止回阀、蝶阀、切断阀、电磁阀、遥控阀、安全阀、节流阀、旋塞）。
The user installs a dual check backflow preventer at the water meter as prescribed by the supplier of safe drinking water.用户要由安全饮用水供应商在水表处安装法定的双止回防回流阀。
Pacific Valves' unique injector has a double ball check protection against leakage and a positive shut-off internal valve.美国太平洋阀门独特的注入器具有双球止回保护，防止泄露，并保护阀门内部活动部件。
General purpose industrial valves-Casting iron globe valves and lift check valvesGB/T12233-1989通用阀门铁制截止阀与升降式止回阀
Do check valves operate properly?止回阀是否工作正常?
inside screw lift check valve内螺纹升降式止回阀
