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Floor spring floor hinge ground spring door spring door hinge glass door hardware 1.General design, suitable for left or right hand to open the door in single and both sides. 2.Two sections closing door value,can adjust the closing door speed between 90degree 25degreeand 25degree 0degree separately 3.90 degree auto-orientation,max opening at 116 degree non-hold on machine available if requested 4.inside pressure reducing valve to prevent the destruction of the floor spring or oil leakage on occasion that the door is closed by strong pressure or wind force. 5.Use low temperature frostbite hydraulic oil,ensuring the normal door-closing speed when the temperature is forty degree below zero. 6.can be adjusted left or right ,forward or backward,up or down,easy to install and adapt to individual requestments 7.passed test of over 500.000 cycles 8.we can mark laser logo on the machine body.Graph parameters: FeatureImageDescribetion Pivot Our pivot is made of Iron 40CR, which is better than general iron in toughness and abrasive resistance. Some of other floor spring manufacturers use general iron instead. Adjust speed screws it is made of brass ,has two seals,which can reduce the phenomenon of leaking. The cover Each of the cover is equipped with two O-RING to make sure the tightness of the floor spring. The test Each of the floor spring has been tested before packing We promise: our products have passed before shipment 100% full inspection.