The valve flap, with a diameter of /- 500 mm to the specification of DE19627689 with a steel core, has a protective mantle of ultra high molecular weight polyethylene. The main surfaces are worked to give a valve flap contour which reduces or eliminates turbulence in the fluid flow through the pipe.
申请公布号
DE19752503(A1)
申请公布日期
1999.06.02
申请号
DE19971052503
申请日期
1997.11.27
申请人
WEFAPRESS-WERKSTOFFE BECK + CO GMBH, 48691 VREDEN, DE
发明人
FRIEDHELM, HABERMEHL, 47055 DUISBURG, DE;BECK, GERRIT, 48691 VREDEN, DE
