| 摘要 |
A pressure relief valve comprises of a substantially elongate valve body (1) with an internal air bleed chamber (2), an adjacent air bleed passage (3) and a tyre valve engagement means (4). The valve body (1) is provided with a cap (5) adjustably mounted to an open end of the air bleed chamber (2). A valve piston (6) is disposed within the air bleed chamber (2). A biasing spring (11) is mounted on the valve stem (9) and is compressed between the cap (5) and the valve piston (6). An air bleed hole (19) is provided in the wall of the valve body (1). A strike pin (13) extends from the tyre valve engagement means (4). When the valve body (1) is coupled to a two way valve (14) of a pneumatic tyre and the strike pin (13) contacts a needle (15) within the two-way valve (14) pressures can be reduced in proportion with a predetermined compression applied to the spring (11). The air bleed chamber (2) and cap (5) have complimentary external and internal threads (16). The compression of the spring (11) of the valve is adjusted according to the degree that the cap (5) is advanced on the air bleed chamber (2) thread (16). |
