※The weight of the door can be adjusted on the body, the length is 6mm, the width is 6mm, and the soil can be adjusted vertically by 2 degrees when in the calibration position.
※Double-stage closing control valve, respectively adjust the closing angle of 90* -25* and 25" -0° closing speed, can be equipped with non-positioning device according to requirements.
※The constant temperature device can also maintain a stable door closing speed under a large temperature difference.
※Built-in pressure reducing device prevents damage to the door or floor spring caused by closing the door under strong external pressure or strong wind.
※Experimental tests have been opened over 600,000 times.