The spewing-preventing fire hydrant equips valve bolt and valve bolt rod. The lower part of the valve bolt rod links valve. Its characteristic is that the valve is spewing-preventing valve, comprising of hollowing-out valve seat and conic valve clack. On the valve clack there links valve clack rod on which equips spring.
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Intensification logic valve start is directly controlled by pilot valve without any intermediate links, so the building-up time of intensification is fully guaranteed.
增压逻辑阀的开启直接由先导阀控制，不经过任何中间环节，使得建压时间得以充分保证。
Use three-way valve, a two-valve and can be saved over a three links.
使用三通阀时，可省掉一个两通阀和一个三通接管。
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