This product is made by means of importing the high-tech rubber and the know-how of valve manufacture of Europe and over comes the defectives as rubber aging and rust etc.It uses the compenseating action from the micro-deformation of elasticity produced by the elastic gate plate to get the good sealing effect and features the advantages of light on-off,reliable sealing,good memory of elasticity,long duration and so on. It can be used as the adjustment and shut off device on the pipeline in tap water,sewage,seawater,water treatment, environmental protection,construction,petrolum,chemical industry,electric power,food medicine,light&textile industry,ship,energy source etc.industries.