PURPOSE: To surely and spontaneously provide a means for preventing a spring retainer from dropping off, by tightly fitting the seat of a pressure difference valve made of synthetic resin, in the spring retainer having a part which is protruded to the seat.
CONSTITUTION: A spring retainer 32, which is fitted on a valve seat 25 made of synthetic resin, is provided with a part 33 protruded to the valve seat. The protruded part 33 of the retainer 32 is provided with a portion for locally increasing the area of contact of the retainer with the valve seat 25 so that as the valve seat made of synthetic resin is deformed with the lapse of time, a recess is made on the section of the valve seat 25 which is located in contact with the protruded part 33. For that reason, the seat 25 is spontaneously provided with a means for surely preventing the retainer 32 from dropping off, with te lapse of time.
TAKAHASHI TOSHIYUKI
NAKAGAWA KEIJI
NIPPON AIR BRAKE CO
| JPS5642574U | 1981-04-18 |