随着采煤机械化的发展,综采机械化程度不断提高,液压支架的液压系统随之复杂。因此,原来使用的转阀早被片阀所代替。因此,现在各个厂家制造的液压支架都使用这种操纵阀。由于这种操纵阀的结构所致,在产品出厂验收中,动作试验、操纵立柱升降时,回液串入邻近操纵阀中,进入其他千斤顶中。因受力面积不一样,而产生压 With the development of mining mechanization, mechanization of fully mechanized mining continues to increase, hydraulic support hydraulic system will be complicated. Therefore, the original use of the rotary valve has long been replaced by the valve. Therefore, hydraulic stents manufactured by various manufacturers now use this type of pilot valve. As a result of the structure of this control valve, the factory acceptance of the product, the action test, the control column up and down, back into the string near the control valve, into the other jack. Due to the stress area is not the same, and produce pressure