30 time, the United States invented butterfly a powerful person, 50 time pass into Japan, just use generally in Japan to 60 time, and be being popularized in our country is the thing after 70 time. Be in commonly on the world at present butterfly a powerful person already replaced DN300 millimeter above gradually brake a powerful person. Butterfly a powerful person and photograph of brake a powerful person shut time weak point than having, the operation is quadrature small, weight of installation space Xiaohe is light. It is with DN1000 exemple, butterfly a powerful person makes an appointment with 2T, and brake a powerful person makes an appointment with 3.5T, and butterfly a powerful person is easy combine with all sorts of actuating device, have good wear and reliability.
Balata 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. 
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