Floating ring seal, also known as floating ring oil seal, is a kind of liquid seal, the seal structure generally by the floating ring (high pressure ring), the outer floating ring (low pressure ring), springs, seals and anti-rotation pin and other components . Equipment in operation, the floating ring in the film under the pressure of the role of the floating state, to overcome the fixed sleeve prone to wear phenomenon; seal gap can be reduced, the closure of the pump capacity and oil recovery facilities, but also can be reduced and simplified , Is the ideal sealing device.