??The new O-ring seal joints are longer life

??Traditional rubber O-rings are assembled by prestressing to achieve sealing effect, in the case of the parts to be sealed require frequent installation and removal, the process of installation and removal greatly increased wear and damage to the rubber O-ring, seriously affecting life.

??Through the factory workers and the actual work of the electronic expansion valve test equipment research, design, a hydraulic dynamic O-ring seal joints, after testing and practical application, confirmed that the joint reaches the sealing requirements, extended service life.

??Rubber O-ring seal in the form of the focus of this study. Because use conditions of the sealing joint is sealed parts require installation and removal of high-frequency, often causing damage to the structure of the common seal O-ring. When the workpiece need to insert sealing joints, sealing joints no ventilation, rubber O-ring is limited only by the upper and lower pressing force plane deformation (hereinafter referred to as the natural state). The amount of compression here with reference to the national standard GB / T3452.3-2005 axial sealing by the size of the external pressure in the form of a groove designed to ensure sealing plane up and down during use.

??When the rubber O-ring seal when a workpiece is mounted into the sealing joint, the outer rubber O-ring is not under pressure, inner diameter larger than the outer diameter of the seal is equal to the workpiece, avoiding the rubber O-ring wear and damage, ensure the sealing performance and extended service life. When the installation is sealed workpiece positioning, clamping gas through the gas passage annular step, the gas uniformly to the outer diameter of the portion of the rubber O-ring to the pressure, because the outside of the rubber O-ring compression, inward deformation of the workpiece clamping is sealed, when gas hydraulic clamping an O-ring seal is pressed against the workpiece after deformation, through the test gas reaches the workpiece is sealed inside the gas passage and the rubber O-ring seal with the workpiece in the middle of the cavity, then the O-ring is sandwiched tight gas compression, due to the gas pressure is set greater than or equal clamping pressure testing gas, while gas compression double clamping area than the area of ??the test gas compression O-ring rubber O-ring that is still large, at this time the equivalent of rubber O-ring seal in the radial piston rod seal state, to achieve the O-ring seals for joints sealing function.