J611F活塞角座阀系列适用于蒸汽和气体，温度达180℃。外部先导角座阀。溢流口与滑块有调节密封压盖，阀体角座结构可实现较大流量，无需维修，带长使用寿命活塞圈的执行机构可靠度高。 J611F piston angle pedestal valve is fit for steam and gas. The temperature can reach to 180℃. There is a pilot angle pedestal valve in the exterior part and a regulative seal stressed top between overflow port and sliding block. The valve angle pedestal structure can fulfill large flow with no need for repair. It is of high reliability for the executive mechanism with long service life piston ring.