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重庆不锈钢阀门之电动调节阀的常见问题

发布时间:2019-07-09 来源:

1、为什么双座阀小开度事情时容易振荡?
1, why is a small two seater valve opening oscillation work easier?
对单芯而言,当介质是流开型时,阀稳固性好;当介质是流闭型时,阀的稳固性差。双座阀有两个阀芯,下阀芯处于流闭,上阀芯处于流开,这样,在小开度事情时,流闭型的阀芯就容易引起阀的振动,这便是双座阀不能用于小开度事情的缘故因由地点。
On single core, when the medium is open type flow, the valve stability; when the medium is the flow of closed type, the valve of the poor stability. There are two spool valve seat, valve core in the flow of closed, open on the spool in the flow, in this way, a small opening in the work, the flow of closed type spool valve is easy to cause vibration, which is two seat valve can not work for small opening reason.
2、为什么双密封阀不能当作堵截阀利用?
2, why not double sealing valve as a shut-off valve?
双座阀阀芯的利益是力平衡布局,容许压差大,而它突出的缺点是两个密封面不能同时良好打仗,造成走漏大。要是把它人为地、欺压性地用于堵截场所,显然结果不好,即便为它作了许多改革(如双密封套筒阀),也是不行取的。
Seat valve spool the advantage of equilibrium structure, allowing a large pressure difference, but it highlights the shortcomings of the two sealing surface is not also good contact, causing large leak. If it artificially, mandatory for cutting occasions, obviously not good, even if it made a lot of improvements (such as double sealed sleeve valve), is not desirable.
3、为什么直行程调治阀防堵性能差,角行程阀防堵性能好?
3, why straight trip valve anti blocking performance is poor, rotary valve attempts to prevent the performance is good?
直行程阀阀芯是垂直节省,而介质是水平流进流出,阀腔内流道肯定转弯倒拐,使阀的流路变得相当巨大(形状如倒“S”型)。这样,存在许多去世区,为介质的沉淀提供了空间,长此以往,造成堵塞。角行程阀节省的偏向便是水平偏向,介质水平流进,水平流出,容易把不干净介质带走,同时流路大抵,介质沉淀的空间也很少,以是角行程阀防堵性能好。
Vertical straight trip throttle valve spool, while the medium is the level of flow into the flow, the valve cavity flow must turn back street, so that the valve flow path becomes quite complex (shaped like an inverted "S" type). So, there are many dead, provides space, if things go on like this for the precipitation of the medium, causing blockage. Throttle valve angle of the direction is the horizontal direction, the level of flows into the medium, the level of outflow, easy to medium is not clean away, a simple flow path at the same time, medium precipitation space is little, so the angular travel valve anti blocking performance.
4、为什么直行程调治阀阀杆较细?
4, why the smaller straight valve stem stroke?
它涉及一个大抵的呆板原理:滑动摩擦大、滚动摩擦小。直行程阀的阀杆上下活动,填料稍压紧一点,它就会把阀杆包得很紧,http://www.cnksmfm.com产生较大的回差。为此,阀杆筹划得非常微小,填料又常用摩擦系数小的四氟填料,以便淘汰回差,但由此派出的问题是阀杆细,则易弯,填料寿命也短。办理这个问题,好的步调便是用旅转阀阀杆,即角行程类的调治阀,它的阀杆比直行程阀杆粗2~3倍,且选用寿命长的石墨填料,阀杆刚度好,填料寿命长,其摩擦力矩反而小、回差小。
It involves a simple mechanical principle: sliding friction, rolling friction small. Straight trip valve stem up and down movement, packing slightly compressed, it will stem very tight package, have a greater difference. Therefore, the stem design is very small, they often fill a small friction coefficient of the PTFE packing, in order to reduce bad back, but this problem is to send small stem, is easily bent, packing too short life. To solve this problem, the best way is to turn the valve stem with a tour, or rotary type control valve, and its thick stem stroke than the straight stem 2 to 3 times, and use long life of the graphite packing, valve stem stiffness good, filling long life, but the friction torque is small, small hysteresis.
5、为什么角行程类阀的堵截压差较大?
5, why the angular travel valve cut-off pressure?
角行程类阀的堵截压差较大,是因为介质在阀芯或阀板上产生的合力对转动轴产生的力矩非常小,因此,它能遭受较大的压差。

Rotary type valve to cut off more pressure, because the media in the spool or the valve on a board together on the shaft of the torque is very small, therefore, it can withstand greater pressure.

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