EF8320G186 ASCO 电磁阀 现货

详情描述：

EF8320G186  ASCO 电磁阀

238常用型号  
SCE238D002
SCE238D004
SCE238D005


238先导式  黄铜阀体  型号全
常闭
SCE238D001
SCE238D006
SCE238D002
SCE238D007
SCE238D003
SCE238D008
SCE238D004
SCE238D009
SCE238D005
SCE238D010
SCG238D016
SCG238D017
SCG238D018


常开
SCG238D019
SCG238D020
SCG238D021
手柄行程越大,对应的二次先导压力也会越大,由二次先导压力控制的主阀芯的开启度也会越大, 与之对应, 主阀芯的开启度越大,主油路分向执行元件的油越多,执行元件的速度就会越快,通过中位流经负压信号发生装置的油越少,负压信号的压力值就会越小;反之如果手柄行程越小,对应的二次先导压力也会越小,由二次先导压力控制的主阀芯的开启度也会越小, 与之对应, 主阀芯的开启度越小,主油路分向执行元件的油越少,执行元件的速度就会越慢, 通过中位流经负压信号发生装置的油就越多,负压信号的压力值就会越大.液压泵根据负压信号的压力值的大小来对其排量进行控制.这就是负流量控制.他的信号采集点是主油路中主控制阀的出口处
　　什么是正流量控制系统?
　　正流量控制系统，是力士乐上世纪80年代的技术，主要特点是：操纵手柄的先导压力不仅控制换向阀，还用来调节油泵的排量。执行元件不工作的时候，油泵上没有先导压力，斜盘摆角小，油泵只输出少量的备用流量。操纵先导手柄，则液压先导回路中建立起与手柄偏转量成比例的压力来控制换向阀阀芯的位移和泵的排量。油泵的流量和由此产生的执行元件的工作速度与先导压力-控制压力成正比例。在正流量的主控制阀上没有负压信号发生装置,他的信号采集于二次先导.其它部分与负流量没有什么区别.
　　与负流量相比正流量为什么操作敏感性好?
　　由于负压控制的信号采集点在主挖掘阀的出口处,只有主控制阀有动作时此负压信号才会发生变化,从而使泵的排量发生变化,这就使得液压泵的控制永远滞后于主控制阀的控制.
　　而在正流量中,由于泵的控制信号采集于二次先导压力,此压力信号同时发送液压泵和主控制阀,这就是使的两者的动作可以同步进行.这就是 “与负流量相比正流量操作敏感性好”的主要原因.
　　与负流量相比正流量为什么节油?
　　在负流量控制的液压系统中,负压信号的压力大约是5MPa,此压力只用于产生负压信号;而正流量控制的液压系统中,由于没有此装置,他的回油压力仅仅是背压(一般在0.5MPa左右),这就减少了一个不必要的功率损失,从而使的正流量的挖掘机在完成同样工作量的情况下一定比负流量控制的挖掘机省油.
未详尽列出的型号，欢迎来电咨询。

ASCO, in 1888 started out manufacturing elevator, compressor and generator controls. In 1910 ASCO became the first company to develop and manufacture a new electrically operated control device known as the solenoid valve. ASCO continued its development activity in these product areas and today manufactures products that are designed to control the flow of air, gas, water, oil and steam - practically every kind of liquid or gaseous substance.
ASCO's heritage of innovation has resulted in an extensive line of products that range from two position on/off valves to entire flow control solutions designed to provide thousands of customer specific solutions.

In the late 1950's ASCO begins to expand internationally . Now having manufacturing and sales in over 42 countries.

In the mid 1970's additional products were introduced, such as, air-operated valves, manual reset valves and pressure and temperature switches to satisfy the ever increasing demand of new applications.
ASCO buys Angar Scientific in 1983 the manufacturer of micro-miniature solenoid valves, now a part of our ASCO Miniature product line.
In 1985 ASCO is acquired by Emerson Electric Co., a fortune 100 company located in St Louis, Missouri.  Emerson Industrial Automation Emerson ranks among the world's largest and most respected industrial corporations.


EF8320G186  ASCO 电磁阀

EF8320G186  ASCO 电磁阀