, Seal failure following three main reasons: (1) open at the time of the sealing surface repair of mechanical seals, 85 percent of seal failure is not due to wear and tear caused by IRG150-350 mechanical seal, but had been leaked before wear. When the sealing surface is opened, the medium of solid particles into the sealed surface under the action of the liquid pressure, the sealing surface is closed, these solid particles can be embedded soft ring (usually right ink ring) of the surface, which has become a real " Wheel "will damage the hard ring surface. Since the rubber ring or rings fastened to the shaft (sleeve), when the shaft moving string, the ring can not be bonded, leaving the sealing surface to open and close the sealing surface of the hysteresis, causes the sealing surface of the solid particles into the . There are also between the shaft (sleeve) and the sliding parts have solid particles affect rubber ring or ring slide (relative dynamic seal point, common fault). In addition, the media also have a rubber ring and the shaft (sleeve) crystals friction parts, there will be in the spring at the solid material, will open the sealing surface. (2), overheating due to the sealing surface will produce heat, so the rubber ring temperature should be below the design specifications. Fluorine rubber and polytetrafluoroethylene use temperature of 216 ℃, NBR use temperature of 162 ℃, although they can withstand higher temperatures, but the heat generated by high sealing surface, so there continues vulcanized rubber ring The danger, ultimately loses its elasticity and leak. (Considering the cold crisp cold zone) between the sealing surface but also because of the heat caused by the crystallization medium, such as a knot of carbon, causing the sliding member is stuck and the sealing surface is condensed. And some of the polymer due to overheating and coking, lose some fluid lubrication due to overheating or even a flash fire. Superheated medium except for status change, it will aggravate the corrosion rate. Deformation caused by metal parts, alloy surface cracking, as well as some of the coating cracks IRG150-315 mechanical seal design should be used balanced mechanical seals to reduce the specific pressure to prevent overheating. (3), the ultra-poor correct mechanical seal assembly tolerances, for the installation of the mechanical seal is necessary, the shaft (sleeve) must have a suitable surface roughness and the correct size, but manufacturers rarely provide tolerance data, installation terms are very critical. (Rely on experience and common sense) mechanical seal dimensional accuracy and geometric tolerances must comply with the requirements of the drawings IRG150-315A mechanical seals, seal tolerance will lead to premature failure. 2. Failure Analysis seal sealing surface itself would provide evidence of seal failure, such as vibration, there will be signs of wear and tear on the transmission parts, such as traces of obvious, it is generally caused by improper assembly. Mechanical seal _IRG150-250B _ circulating pump mechanical seal (certified merchants) provided by Anguo City Pump Co., Ltd. Yuan Shi. Shi Yuan Yasukuni City Pump Co., Ltd. (www.shiyuanbeng.com) is specialized in the "IS centrifugal pump, XA centrifugal pump, BA centrifugal, B-type pump, double suction centrifugal pump" of the enterprise, the company of "honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Geng wheat.