英国 TI Reynolds公司声称,由于采用了一种活塞密封结构,已能用该公司生产的冷拔钢管直接制成油缸,而不需要再进行珩磨。这种活塞密封结构是由三个密封圈组成(详见附图):里层为一O形密封圈,外层为一X形密封圈,在两者之间还装有一U形密封圈(由聚四氟乙烯基的弹性材料制成)。当活塞装入油缸后,X形密封圈被挤压而紧贴于油缸壁上,起到初始的密封作用。当油缸内工作介质的压力升高,O形密封圈产生变形,顶起U形密封圈,使之与缸壁相接触,和X形密封圈同时起到高压密封的作用。据说这种活塞密封结构的密封性能优异,还可适用于油缸活塞两侧为两种不同油液或一侧为油液、另一侧为气体的油缸。此外,还容许活塞作转动或振动,即使在活塞静止时,也至少可承受 TI Reynolds, UK, claims it has been able to manufacture cylinders directly from the company’s cold-drawn tubes without the need for further honing thanks to a piston-sealed construction. This piston seal structure is composed of three seals (see the attached drawings): the inner layer is an O-ring, the outer layer is an X-ring, between the two is also equipped with a U-shaped ring Made of polytetrafluoroethylene based elastic material). When the piston into the cylinder, the X-ring is squeezed close to the cylinder wall, played the initial seal. When the working medium in the cylinder pressure increases, O-ring deformation, jacking U-shaped ring, making contact with the cylinder wall, and X-ring at the same time play a role of high-pressure seal. It is said that the sealing structure of the piston seal performance is excellent, but also applies to both sides of the cylinder piston for two different fluids or oil on one side, the other side of the cylinder gas. In addition, the piston is also allowed to rotate or vibrate, at least even when the piston is stationary