弹簧受压差的作用自动控制阀胆上过流面积的大小，从而使通过阀门的流量恒定。
The role of compression springs bad gall on automatic control valve flow area of the size, so that a constant flow through the valve.
针型阀比其他阀门更能受压，密封性能好，所以一般用于较小流量，较高压力的气体或者液体介质的密封，还可与压力表配合使用。
Needle valve pressure better than other valves, sealing performance, it is generally used for small flow, high pressure gas or liquid sealing medium, also used in conjunction with the pressure gauge.
压力补偿滴头具有出水流量不受压力变化影响、抗堵性较好、具有自冲洗功能等优点，已成为世界各国研发的热点。
The pressure compensating emitters which have the advantages of constant flow under the change of pressure, anti-clogging and self-cleaning performance have been the hotspot in research in the world.
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