The structure and principle of the LV-3 type heightcontrolvalve in Japan are described. And the common troubles appeared in application of the heightcontrolvalve are analyzed.
介绍了日本LV 3型高度控制阀的结构和原理，并分析了该高度控制阀在运用中出现的常见故障。
2
When the water tank after falling, floating ball valve to open, the control room pressure drops, the main valve to open again to water, keep the level set height.
当水池水面下降后，浮球阀重新开启，控制室水压下降，主阀再次开启继续供水，保持液面的设定高度。
3
The signal of soil resistance sensor and the implement lift height sensor and the control-valve sensor were measured and managed. The system was under the control of the SCM.