| 摘要 |
<p>986,833. Valves. W. CARLS. Aug. 24, 1962 [Aug. 25, 1961], No. 32687/62. Heading F2V. Steam from an inlet 12 to an outlet 14 passes through an opening 68 in a nipple 24, the area of which opening is controlled by a needle valve 66 threaded into the nipple; whilst the valve 66 cannot completely close the opening 68 the degree of the throttling afforded thereby is indicated both by the number of grooves 41-45 visible above the top of the nipple 24, and the position of an offset pin 50 relative to spaced axial graduation lines on the upper part of the nipple. A plastic plug 83 prevents the needle valve from turning due to vibration. A bore 84 in the lower part of the valve casing houses a removable cartridge 96 containing a ball-type non-return valve 102 by-passing the needle valve 66 but which remains closed when fluid flows from the inlet to the outlet. Return flow of fluid from outlet 14 to inlet 12 passes through a passage 92, parts 120, 110, 112, the valve 102, port 122 and a passage 90 so avoiding the throttled path via the needle valve. In another form a different cartridge is employed, the ports, passages and non-return valve in which provide for a parallel path across the needle valve when the fluid flows from the inlet to the outlet, which path is closed when the fluid flow reverses.</p> |
