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- needle valve assembly 针阀偶件
- Forward needle valve positions for easy access. 针形阀位置提前,便于接近。
- Attach vent (yellow) hose to TC#4 and vent needle valve. 连接排气（黄）软管到测试旋塞4号和排气针形阀上。
- Secure with locknut and gaskets. Install valve assembly. 用放松螺母和垫圈紧固。安装阀门总成。
- Open TC#3, needle valve "B ", and vent needle valve. 开启测试旋塞3号，针形阀“B”，和排气针形阀。
- Open TC#2 and needle valve "A", close needle valve "A" and TC #4. 开启测试旋塞2号和针形阀“A”，关闭针形阀“A”和测试旋塞4号。
- Close needle valve "A" high side (red) and open test cock No. 2. 关闭针形阀“A”高端（红），并开启测试旋塞2号。
- Kit consists of: Relief Valve Assembly, RV Spring, and RV Cover O-ring. 组件包括：安全阀总成，安全阀弹簧，和安全阀阀盖O形环。
- All needle valves must be closed on test kit. 检测组件上的所有针形阀必须关闭。
- To assemble the Relief Valve Assembly have a screwdriver ready. 准备好组装安全阀总成的螺丝刀。
- Open vent needle valve and bleed air from hose. Then close vent valve. 开启排气针形阀，并从软管排放空气。然后关闭排气阀。
- Open vent needle valve fully until dripping from vent connection stops. 完全开启排气针形阀直到从排气连接处的滴漏停止为止。
- Open test cock No. 2 and needle valve "A" high side (red) on test kit. 开启测试旋塞2号和检测组件上的针形阀“A”高端（红）。
- Valve assembling: Place the ball into the body. 重组阀门：将球放入阀体。
- DOUBLE CHECK VALVE ASSEMBLY For Low Hazard Cross-connections and continuous pressure applications. 双止回阀总成用于低危险交叉连接和持续压力应用场合。
- Before starting test all needle valves must be closed. 在开始检测之前,所有阀门都必须关闭。
- NOTE: DO NOT USE A PIPE WRENCH TO REMOVE THE RELIEF VALVE ASSEMBLY FROM THE BACKFLOW PREVENTER. 注意:不要使用管钳从防回流阀上拆卸安全阀总成。
- Before starting test, all needle valves on test kit must be closed. 在开始检测前,检测组件上的所有针形阀都必须关闭。
- Needle valves have NPS / internal pipe threaded ends. 针形阀配置NPS内管螺纹连接端口。
- All internal parts shall be accessible through a single cover on the valve assembly securely held in place by a two-bolt grooved coupling. 所有内部部件应该可以通过阀门总成上的一个阀盖接近，这个阀盖采用两个螺栓槽联结器固定。
