Description of imported water pump low low valve inlet valve Products imported pumps bottom valve is a valve of energy conservation, mainly installed at the bottom of the pump suction line can automatically prevent fluid backflow. Import water pumps bottom valve for restricting fluid return pump tube water, into play not only the function of the valve cover has a number of water supplies and ribs, played a role in preventing clogging, mainly used in pipeline pumping, the role of waterways and supported caliber have univalve, double valve, Orange Peel type, connection flange connection threaded connections. Imported water pump foot valve structure and principle:? Pumps bottom valve from the valve estimate, valve, valve covers, bushings, seals and other parts, water, water from the bonnet into the body of fluid under pressure effect, valve. flap open water, when shown to stop the pressure outlet pipe inside the clapper quickly closed, the liquid will not fall back to the water, that is played a smooth pumping action and saving water loss .. ? Import water pumps bottom valve performance parameters: Nominal pressure: PN0.25MPa nominal diameter:? DN15 ~ DN400 Temperature:? -20 ~ + 500 ℃ Suitable medium: water, oil, corrosive medium other major component materials:? Gray cast iron ?, nitrile rubber Executive Standard: Q / 12 NJ3583-2001 test standards:? GB / T13927-1992?