: check valves brass structure, resistant,, good ductility at high temperatures, low conductivity, long service life, can be used for a long time Wide range of applications: suitable for water, steams, oil, nitricacid, urea and so on Widely used in mechanical equipment, water supply and drainage, industrial plant, live aquatics plant High: the spring check valves is also very and prevents liquid backflow Just a few turns, the valves is tightened and no leakage Working temperature range: 4 to +212 F ( 20 to +100 °C) MaximumS working pressures 25 / 18 / 12 ( PN-25 / PN-18 / PN-12 Perfect: Our check valves can be connectes to all pipes, hoses and 1inch male thread according to BSPstandards, this type of valves can be very good to liquid leakage, the installation should be installed horizontally to allow only unidirectional flows of the to avoid accidents, Manufacturer: YanFengPro