| 摘要 |
<p>The dislodgement of the soft washer of a fluids rate of flow saving or limiting device comprising a fluid pressure actuated needle type shutter (104) and a flow restricting washer assembly through which said shutter (104) passes to obstruct the free flow of the fluid depending on the pressure thereof and including a soft washer (111) sandwiched between two hard washers (110, 112) is prevented by enclosing said soft washer (111) within a housing (120) having a circular bottom (112) provided with an opening of a predetermined diameter larger than the diameter of said shutter (104), a cylindrical wall (114) extending upwardly along the periphery of said bottom (112) to a distance sufficient to constitute a cavity for receiving said soft washer (111), and a lid (110) to cover the housing (120) and having an opening of the same diameter as said bottom (112), said lid (110) being arranged with respect to said cylindrical wall so as to sandwich said soft washer (111) between said lid (110) and said bottom (112), said soft washer (111) having an opening of a diameter smaller than the diameter of the openings in said lid (110) and said bottom (112) and being fixed within said housing (120) to avoid dislodgement thereof by high fluid pressures. Under low moderate fluid pressures, the flow restricting washer assembly merely comprising the soft washer (111) sandwiched between the two hard washers (110, 112) provides a satisfactory and efficient operation of the device.</p> |
