| 摘要 |
PURPOSE:To make a nozzle seat hard to be scratched and to enable to keep the sealing property of a nozzle even under the condition of slight scratches given and foreign matters adhered to the nozzle seat by a structure wherein the title mixing nozzle is equipped with a piston, on which a circulating course is provided, an elastic body arranged at the tip of the piston and an opening provided in the sliding direction of the piston. CONSTITUTION:Under the condition that a piston 11 is advanced, material is supplied from a supply pipe 14 in the interior of a cylinder 14, past through a circulating course 12 and discharged outside from a return pipe 15 and consequently no material is supplied to a mixing chamber 19 through an opening 17. When the piston is retrated beyond the supply pipe 14, the material supplied from the supply pipe 14 is supplied in the interior of the mixing chamber 19 through the opening 17. An elastic body 16 pressed against a nozzle seat 18 by means of the piston 11 deforms elastically so as to closely contact with and along the nozzle seat 18. Accordingly, even in the state of slight positional shifting of centers and slight tilting of contact surface between the elastic body 16 and the valve seat 18, the elastic body 16 keeps on closely contacting with the nozzle seat 18 owing to the elastic deformation of the elastic body. |
