Stainless Steel Vertical Check Valve Model: H42W caliber: SN15-DN200 Pressure: 1.6MPA-4.0MPA Material: 304/316 / 304L / 316L medium: water, oil temperature: ≤120 ℃ Overview: Check: check Also known as the one-way valve or check valve, and its role is to prevent the line of medium back. Pump water off the bottom valve also belongs to check class. Opening and closing pieces by medium flow and strength to turn itself on or off, in order to prevent the media called backflow check valve. Check valves are automatic valves, mainly used for one-way flow of media channels, only allowing media to flow in one direction, in order to prevent accidents. Check valve according to the structure can be divided into lift check valve, swing check valve and butterfly valve three. Lift check valve can be divided into vertical and horizontal. Swing check into a single lobe, double valve type and Orange Peel three. Butterfly valve for straight-through, check the connection over several forms can be divided into threaded, flanged and welded three. Product description: H42W vertical stainless steel flange valve normally is closed, due to the pressure in the inlet end of the line media, and to overcome the resistance of the spring to open the valve. When the pressure is lower than the inlet end of the media outlet end, spring will push the seat leaving the spool valve closes to prevent backflow media, so starting and ending back role. As a result of vertical stainless steel flange valve spool spring support, so it can be mounted vertical or horizontal installation. Standards: the design and manufacture standard: Structure Length Standard: GB / T 12221-2005 Flange Standard: GB / T 9113 pressure and temperature rating: GB / T 12224-2005 test inspection standards: GB / T 13927-2008