| 摘要 |
A vacuum enhancing valve 10 is disclosed for direct connection to a vehicle brake booster 96 which increases the partial vacuum provided thereto and restricts possible air back flow into the brake booster 96. The valve 10 comprises a venturi 36, 38, 40 for reducing the pressure of air induced to flow between a first air inlet 18 and an air outlet 20 by a partial vacuum at an intake manifold of an engine. By significantly reducing the air pressure, the valve enhances the partial vacuum available for provision to the brake booster 96. The venturi 36, 38, 40 is also in air communication with a second air inlet 62 directly attachable to the brake booster 96 such that the air pressure at the second air inlet 62 tends toward the enhanced partial vacuum within the venturi 36, 38, 40. A valve seat 42, 44; 74, 76 and seal member 60, 61 within the valve 10 are cooperative to allow air flow from the second air inlet 62 toward the venturi 36, 38, 40 but not in the reverse direction. |
