For almost 30years, YUANXIN seal has specialized in the design, manufacturing and delivery of high-performance sealing part for engineering machinery. We provide high‑quality oil seals with complete product range for your machinery.
Seal categorization
Seal is divided two types by the scope of use: the gasket type which prevents leak in static state and the packing type which prevents leak in dynamic state. Simply put, compression-type packing is inserted to the device gap in order to prevent leakage. Other packings include SELF-SEAL PACKING. Seal operates automatically when equipped at the gap shaped like V,L,U,Y,J,O, and hydraulic pressure is given to the seal. SELF-SEAL PACKING is divided into LIP PACKING and SQUEEZE PACKING. Also, rotation seal which prevents leakage at rotation parts is divided into mechanical seal and oil seal.
Importance of PACKING and SEAL
Sealing technique rapidly grew as the equipment speed and capacity increased. There are, however, many aspects to be modified. Sometimes, in case of seals equipped on devices of different materials, seal abrasion or performance may deteriorate before the regular seal replacement period. Basically, seal prevents oil leakage inward, and prevents the entry of foreign substances. The form of seal has a large influence on the equipment performance,so it must be designed appropriate to the equipment. Normally, seal is equipped at the narrow part inside the machinery, so it is sometimes disassembled to check the seal status.
Sealing principle of LIP PACKING
When lip packing is equipped at the empty part of the furrow so that fluid pressure is applied to the empty part of the furrow, the pressure at the front direction of lip generates excessive pressure at the surface on the other side. Figure 1-1 shows the result of pressure distribution when U-PACKING like A contacts the lip surface. Figure 1-1 shows the actual measurement case, where the maximum pressure is higher than the fluid pressure, and the SELE SEAL to prevent hydraulic pressure leak is determined depending on the SEAL-ING's basic capacity, speed, temperature, and oil viscosity. The causes of deteriorated durability performance due to seal usage environment include quality changes, deformation, abrasion, and seal material damage. Seal material can be damaged by usage state, high temperature, speed, compression and subsequent oil types.
