双偏心半球阀
double eccentric semi-ball
结构设计类似三偏心硬密封蝶阀，具有操作轻便、开启过程无磨擦、零泄漏、寿命长等优点。
产品特征如下：
一、密封副（阀芯，阀座）—双金属，实现金属球面环带硬密封，防火防爆；
二、密封严紧，阀芯和阀座的密封是球面线接触，靠三维偏心实现零泄漏；
三、密封副的阀芯留有补偿量，阀门使用较长时间发现密封副磨损时，只需松动手轮侧的限位螺栓，关闭时再转动少许，仍可实现可靠密封，延长使用寿命。
四、可将压紧套拧掉，调整或更换阀座，阀门仍可继续使用，避免了现行众多阀门密封失效后整台报废的弊端。
我公司半球阀产品按用途分为：通用阀、管线阀、料浆阀、燃气阀、石油化工阀、煤粉喷吹阀六大系列。传动方式有手动、气动、电动三种，八个压力等级（PN0.25～10.0Mpa）数百个规格（40～1000）的半球阀产品。在石油、化工、冶金、电力、燃气等行业是闸阀、截止阀、Y型阀、球阀的更新换代产品。目前已在钢铁行业的煤粉喷吹，氧化铝行业的矿浆、母液和氧化铝粉输送，电力行业的水力（或干）除灰，石化行业，燃气行业等场合。
Double eccentric semi-ball
Structure Designed is similar to hard sealing of three- eccentric of butterfly valve, with convenient operation , without friction opened and leakage , long life . Flowing are features:
First、Sealing deputy （trim and seat）- double metal can achieve sphere of metal with hard sealing and prevent fire and explosion.
Second 、Tight sealing ,trim and sealing seat are contacting of spherical . It relies three-eccentric to achieve non-leakage;
Third、Trim of sealing deputy with compensation, once valve is used for long time and discovered sealing deputy out of service ,only to loose limit blots of handwheel .And turning a litter when closed to achieve reliable sealing and extend life.
Four、Set screw can be pressed out, seat can be adjusted and replaced, valve can be used and avoid sealing which is out of using than all valve is abandoned.
According to usage,semi-ball valve is divided into six series :universal valve, pipeline valve, specialize in slurry valve, specialize in gas valve, specialize in petrochemical valve ,specialize in pulverized coal .Transmission methods are manual , pneumatic, electric. Eight pressure levels （PN0.25~10.0Mpa） . There are hundreds of specifications （40~1000）
semi-ball valve . In petroleum, chemical ,metallurgy, electricity, gas etc industries,gate valve , stop valve , Y-type valve, ball valve are replaced of semi-ball valve. Now, it's sold well in coal injection of steel industry,pulp of alumina industry ,liquor and alumina powder transport, water （or dry） ash of electric power industry , petrochemical industry and gas industry ,etc.
