| 摘要 |
<p>1,003,001. Valves. BENDIX CORPORATION. March 1, 1963 [March 23, 1961], No. 8414/63. Heading F2V. A relief valve comprises a generally tubular casing 10 having an outlet passage 16 and an inlet passage 11 formed in a bushing 12 having a valve seat 12b engageable by a poppet 14 with an apertured skirt 14f slidably guided on a cylindrical portion 12a of the bushing and a head portion 14c slidably guided by an inner cylindrical surface 18a in a spring retainer 18 held against an adjustable abutment 19 by a spring 21, the valve seat and poppet having annular contact surfaces which are so shaped and positioned with respect to each other that opening movement of the poppet produces a flow channel therebetween having a component opposite to the direction of opening movement whereby fluid flow through the channel tends to open the poppet further. The spring 21 consists of a plurality of perforate discs 21a separated by rings 21b and 21c. A chamber 23 inside the head portion 14c communicates with the inlet 11 through a filter 14g to reduce the spring force required to close the valve and to act as an hydraulic damper. Fig. 2 shows alternative shapes of poppet and seat in which a protuberance 33 facilitates flow reversal. The poppet of Fig. 2 may be used with the seat of Fig. 1.</p> |
