| 摘要 |
A calibrated gas-metering valve is disclosed which includes a two-part valve body having a gas inlet, a gas outlet, and a metering element therebetween. The metering element has a first and a second hole therein, which first and second hole intersect and together define a passage for gas flow from the gas inlet to the gas outlet. A ball of a diameter approximately equal to the diameter of the first hole is press-fitted into the first hole so as to be positioned therein solely by the fitting engagement of its surface with the wall of the first hole. The ball is located adjacent the intersection of the first and second holes so as to define a region in the passage having a cross-sectional area less than the cross-sectional area of either the first or second holes. The position of the ball with respect to the intersection of the holes is fixed to achieve the desired gas-metering rate. |
