| 摘要 |
<p>A constant rate flow valve comprising: a valve proper (5) having a flow inlet passage (2), flow outlet passage (3), and hollow chamber (4) positioned between said two flow passages and slanting at a certain angle with respect to said flow inlet passage; an opening part (7) permitting said outlet passage to communicate with said hollow chamber with the inner periphery diameter thereof reducing gradually from the upstream side toward downstream side; a lid body (17) fitted on said valve proper; a spindle (9) supported by said lid body and movable back and forth along the axial line of said opening part; a cylinder (10) fixed to the lower end of said spindle integrally therewith; a valve spindle (12) loosely fitted into said cylinder and disposed approximately on the same axial line as that of said opening part; a valve body (13) mounted on the tip of said valve spindle so that an orifice may be formed between the valve body and said opening; and springs (14, 15) arranged in said cylinder and energizing said valve so as to separate said valve from said opening part. The abovesaid cylinder (10) is capable of moving back and forth in said hollow chamber (4) and coming into contact with the valve seat (6) of said opening (7) at lower end thereof and said springs comprise a plurality of springs (14, 15) having respective spring-constants different from each other so that their expansion or contraction actions in response to variations in fluid pressure may start with a time lag therebetween. <IMAGE></p> |
