| 摘要 |
<p>A new gas flow control valve which also enables the mass flow to be measured, which valve, using a flow straightener in the valve entry duct, a tube for prolonging said entry duct into the valve, a valving element passage port with suitably radiused edges and a flow stabilizer in the valve exit duct, and positioning the upstream and downstream pressure taps of the valve immediately upstream of said flow straightener and downstream of said stabilizer respectively, enables the flow rate to be controlled not from the formulas traditionally used for valve dimensioning but from formulas derived from the more accurate formulas used for calculating mass flow with standard members of fixed restriction type. Preferred embodiments of the valve components are also described. <IMAGE></p> |
