排气阀性能要求

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原文：
a.排气阀应有较大的排气量，当管道空管充水时可在极短的时间内实现快速排气恢复至正常供水能力。 b.排气阀在管内有负压产生时，活塞应该可以迅速开启，快速大量吸入外界空气，以保证管线不会因负压而产生损害。且在工作压力下能够将管道中集结的微量空气排出。 c.排气阀应有比较高的空气关闭压力，在活塞关闭前的较短时间内，应有足够能力将管道内的空气排放完毕，提高输水效率。 d.排气阀的水关闭压力应不大于0.02MPa，在较低的水压下就可以关闭排气阀，从而避免水的大量涌出。 e.排气阀应采用不锈钢浮球(浮桶)作启闭件。 f.排气阀阀体上应设有防冲击保护内筒，以防大量排气后高速水流直接冲击浮球(浮桶)而造成浮球(浮桶)的过早损伤。 g.对于DN≥100的排气阀采用分体结构，由大量排气阀和自动排气阀组成，以适应管道压力的使用要求。自动排气阀应采用复杠杆机构，使浮球浮力得以大幅度放大，且关闭水位低，水中杂质不易接触密封面，排气口不会被堵塞，其抗堵塞性能可大大提高。同时在高压情况下，由于复杠杆的加力作用，使浮球能和水位同步下降，启闭件不会像传统阀门被高压吸住，从而正常排气。 h.对于高流速、频繁启动水泵、口径DN≧100的工况，为减缓水流冲击，排气阀应加装缓冲塞阀。缓冲塞阀应可以防止大量喷水但不影响大量排气，使输水效率不会受到影响，并有效防止水锤发生。

“ Exhaust valve performance requirements”是由中国旋塞阀网提供的国际阀门新闻，译文仅供参考。另外，中国旋塞阀网还提供相关产品搜索：二通旋塞阀、三通旋塞阀、油密封旋塞阀、更多旋塞阀产品、旋塞阀价格、等。

译文：
Exhaust valve performance requirements a. exhaust valve should have a larger displacement, when the pipeline empty water-filled tube can be in a very short period of time to achieve rapid return to normal supply capacity of the exhaust. b. exhaust valve in the pipe produces negative pressure within the piston should be able to quickly open, quickly inhaled a lot of outside air to ensure that the pipeline will not produce negative pressure and damage. And work under pressure to build the pipeline trace the air discharge. c. exhaust valve should be closed relatively high air pressure, the piston before the closure of a relatively short time, should have adequate capacity to discharge the air inside the tubes is completed, to improve water efficiency. d. Close the exhaust valve of the water pressure should be less than 0.02MPa, at a lower water pressure can close the exhaust valve, thus avoiding a lot of water poured out. e. should be made of stainless steel exhaust valve float (float) for opening and closing pieces. f. exhaust valve body should be equipped with anti-shock protection within the tube, after the high flow to prevent excessive exhaust direct impact Float (float) float result (float) of the early damage. DN ≥ 100 g. For the exhaust valve using sub-structure, and by the large number of auto exhaust valve exhaust valve formed to meet pipeline pressure requirements. Automatic exhaust valve should be used to re-lever mechanism, able to significantly enlarge the float buoyancy, and close the water level is low, easy to contact with the sealing surface impurities in the water, exhaust port is not blocked, the anti-clogging performance can be greatly improved. While the high pressure case, because the complex role of leverage in the afterburner, and the water level can be synchronized to float down, not like a traditional opening and closing pieces of high-pressure valve is sucked to the normal exhaust. h. For the high flow rate, frequent start the pump, diameter DN ≧ 100 working conditions, to mitigate the impact of water flow, the exhaust valve should be installed buffer plug valve. Buffer plug valve can prevent a lot of water but should not affect a large number of exhaust, so that water efficiency will not be affected, and effectively prevent the occurrence of water hammer.

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原文来源：http://www.1xuansaifa.com/

2011-12-29 07:23