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在各种型式的油缸中,单杆式双向(往复)运动油缸构造较简单,作为要求作直线往复运动的油压操纵部分应用甚广。但进行制动则一般是采用换向阀,辅助操纵止回阀和机械制动器等。其中利用换向阀的方法是最便利、简单的。可是,由于换向阀内泄漏,对上述油缸的影响是不可忽视的。一般,换向阀是采用静压平衡,所以其可动部件是用滑阀式滑动构件,阀体和滑阀之间允许有大约5～30微米的直径间隙。因而在阀内相邻开口间的密封处发生的所谓内泄漏,对于滑阀来说是不可避免的。此泄漏量约在换向阀额定流量的1%以下(指在最
In all types of fuel tanks, single-rod bi-directional (reciprocating) movement of the cylinder structure is relatively simple, as required for linear reciprocating hydraulic control section is widely used. However, the brake is generally used to change valve, auxiliary control check valves and mechanical brakes. Which use the valve is the most convenient and easy way. However, due to leakage within the valve, the impact on the cylinder can not be ignored. In general, the directional control valve is hydrostatically balanced so that its movable part is a slide-type slide member with a clearance of about 5 to 30 μm in diameter between the valve body and the slide valve. The so-called internal leakage that occurs at the seal between adjacent openings in the valve is therefore unavoidable for the slide valve. This leakage is about 1% of the rated flow of the valve (refer to the most