Non-maintance design, inside and outside electrostatic epoxy resin powder coating, the valve can be installed under the ground directly. The valve adopts the back seal and the stem seal, those double seals can avoid any top leakage when installation. The customer can easily replace the top seal "O" rings under the pressure. The valve adopts flat bottom designing ensures no dead space and very little flow resistance. The wedge adopts bidirectional groove design ensures the best reliable seal. A set of seal pressure angle adopts gradual design. The pressured surface of setm adopts high strength self-lubricated materials, the valve can be opened and closed easily. The bonnet, body castings adopts equal thickness design to avoid the outside leakage by the stess function. STANDARDS APLLIED DESIGN STANDARD FACE TO FACE DIMENSIONS TESTING STANDARD DIN3352-4A DIN3202, F4 DIN3230 DIN3352-4B DIN3202, F5 DIN3230 BS5163 BS5163 BS5163 SUITABLE AREA Potable Water , Waste Water , etc. SCOPE Nominal diameter DNï¼?mm) Nominal pressure (MPa) Water power testingï¼?MPa) Working temperatureâ?¤ 800C Maximum working pressureï¼?MPa) Strength testing Seal testing 40ï½?600 1.0 1.5 1.1 1.0 40ï½?600 1.6 2.4 1.76 2.0 40ï½?300 2.5 3.75 2.75 2.5 PART LIST NO. PARTS MATERIAL 1 Body GGG 2 Wedge GGG bonded with NBR or EPDM 3 Stem 2Cr13 4 Stem nut ZCuA110Fe3 5 Middle gasket NBR or EPDM 6 Bonnet GGG 7 Bolt Q235-A 8 Lubricant gasket PTFE 9 O-ring NBR or EPDM 10 O-ring NBR or EPDM 11 Seal bush POM 12 Seal cover 2Cr13 or 304 13 Dustproof cover NBR or EPDM 14 Top cover Pa-66 15 Hand wheel Sg-12 16 Screw Cr13 Skype:maryworld162 MSN/eMAIL: mary6121 *****