| 摘要 |
PURPOSE:To improve operability and increase the degree of freedom of design by providing respectively a stopper for preventing a valve body from dropping out at the rear end of a hub and a second stopper at the front end to interconnect integrally the valve body and a center body with both stoppers. CONSTITUTION:A small diameter right end portion 10a of a raction hub 10 is slidably fitted in a shaft portion of a valve body 6, and a stopper 11 is mounted on the end of said portion 10a to bear against the shoulder of the valve body 6. And a rear diaphragm 5 and a rear power piston 13 are sandwiched between the right end of a center body 12 and the left end face of the valve body 6 and a front diaphragm 4 and a front power piston 15 sandwiched between the left end face of the center body 12 and a nut 14 threaded into the hub 10 to be fastened by the nut so that the valve bodt 6, center body, diaphragms 4, 5 and power pistons 13, 15 are integrally combined. Thus, the operability of assemblage and the degree of freedom of design can be increased. |
