Optimized pressure relief valve for hydraulically extensible piston of flexible drive e.g. belt, for internal combustion engine of motor car, has cartridge utilized at valve piston and made of plastic material and reinforcing fiber

摘要

The valve has a cartridge (5) utilized at a pressure relief valve piston (2), and a spring (10) located within the cartridge. The pressure relief valve piston is fixed inside a hydraulically extensible piston (1). The spring applies force on a ball part (9) that is operated as a valve body in a longitudinal direction of the valve. The cartridge is made of plastic material e.g. PA or PA66, and reinforcing fiber e.g. glass fiber or aramide fiber. The cartridge comprises a ball guide portion (21) that is attached to a ball contour and/or a spring guide section that is attached to the spring.