The function instruction of FLS28 floor spring · Dimensions: 270mm*125mm*52mm · Suitable for maximum 800mm wide door leaf and the maximum bearing weight is 90kg · The maximum opening angle is 105 degree, can be located at 90 degree or 105 degree · Two-stage speed adjusting, suitable for the closing effect on various occasions · Inside pressure reducing value: using to prevent the destruction of the floor spring or oil leakage on occasions that the door is closed by strong pressure or wind force · General design, suitable for left or right hand to open the door in single and both sides. · Use low temperature frostbite hydraulic oil, ensuring the normal door-closing speed when the temperature is forty degree below zero degree · For cement container, 5mm adjustable in length and width, and 2 degree vertically adjustable when the calibration position is zero. · The products have passed national QB/T 3884-99 standard, using times are guaranteed more than 300,000 times. · According to ISO9001 standard and 2000 international quality management system, go through product quality control process, in order to better guarantee the quality stability.