This EPDM material is compressed between the brass portion of the disk and straight bore through the PVC body and creates the sealing mechanism for this butterfly valve.

• 这种三元乙丙橡胶材料被压缩在阀瓣的黄铜部分和穿过PVC阀体的直线镗孔上，为这种蝶阀产生密封性能。