Audo Look6.0 downloadBalata is sealed defect of butterfly a powerful person is when making reduce expenditure use, because use undeserved meeting to produce cavitation erosion, make oak rubber base flakes, the circumstance such as injury happens. For this, develop a metal again in the world now sealed butterfly a powerful person, cavitation erosion area is reduced, in last few years our country also developed a metal sealed butterfly a powerful person, return development to be able to bear or endure in recent years in Japan of cavitation erosion, low vibration, low noise comb a powerful person of tooth form butterfly.
General and sealed life falls in normal circumstance, balata 15 years - 20 years, 80 years of the metal - 90 years. But how to choose correctly should ask according to operating mode.
Of butterfly a powerful person leave degree with the relation between discharge, basically show linear scale change. If be used at controlling flow, the flow resistance of its discharge character and tubing also has affinity, if two conduit install diameter of doorway of a powerful person, form,wait completely identical, and conduit loss efficiency is different, the discharge difference of valve also is met very big.
If valve is in reduce expenditure extent larger position, the back countenance of board of a powerful person sends angry corrode easily, have the possibility of attaint valve, all use outside 15° commonly.
Butterfly a powerful person is in in when spending, body of a powerful person and butterfly board the mouth appearance that front forms is a center with valve shaft, two side are formed achieve different status, of a side butterfly board front arranges running water direction and move, another side goes against running water direction and move, accordingly, body of a side a powerful person and a powerful person board form be like nozzle form mouth, another side is similar form of reduce expenditure aperture starts to talk, many nozzle side is faster than velocity of flow of reduce expenditure side, and negative pressure can generate below valve of reduce expenditure side, often can appear balata weather strip falls off.
Butterfly a powerful person operates moment of force, spend because of leaving reach valve to open shut direction to differ its are worth each different, horizontal butterfly a powerful person, especially large requirements a powerful person, as a result of depth of water, on valve shaft, the moment that next head difference produce also nots allow to ignore. Additional, when valve imports side device bend, form drift, pitching moment can have increase. Valve is in among when spending, because current moves pitching moment to act well, manipulator compose needs to be locked up oneself.
-- news source: Always fine county limited company of Zheng Xu valve
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