The check is in the series of coil and four-way reversing valve control relay contact resistance increases, the bad, the contacts the voltage reduced.
经查是与四通阀线圈串联的控制继电器触点接触不良，电阻增大，致使电压降低。
The utility model relates to an end-face sealed manual three-position four-way reversing rotary valve.
本实用新型涉及一种端面密封手动三位四通换向转阀。
The utility model relates to an end-face sealed manual three-position four-way reversing rotary valve.
本实用新型涉及一种端面密封手动三位四通换向转阀。
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