Seal for high pressure water jets

A seal for a pressurized water jet apparatus utilizing a pressurized water stream provided therein, wherein the pressurized water jet apparatus includes an inner shaft, and a rotary body rotatably coupled to the inner shaft, wherein the seal comprises:

• an outer seal of generally tubular shape, the outer seal including an axially-extending through hole containing a tapered hole portion therein such that an inner diameter of the tapered hole portion is expanded in a direction in which the pressurized water stream inside the pressurized water jet apparatus is to be discharged;
• and
• an inner seal inserted in the tapered hole portion of the outer seal and having an inner diameter allowing the inner shaft of the pressurized water jet apparatus to be snugly inserted thereto,
• wherein an outer surface of the inner seal is tapered to correspond to a shape of the tapered hole portion of the outer seal, so that the inner seal is pressed along a tapered surface of the outer seal to limit a compression deformation of the outer seal as a hydraulic pressure of the pressurized water acts on distal end surfaces, located farther from an operator of the pressurized water jet apparatus, of the outer seal and the inner seal.