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Control valve for keeping the rate of flow at a fixed value

  • US 4,175,584 A
  • Filed: 08/31/1977
  • Issued: 11/27/1979
  • Est. Priority Date: 08/31/1977
  • Status: Expired due to Term
First Claim
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1. A constant flow regulating valve comprising a valve casing having inlet and outlet ports in spaced locations therein, a tubular guide member mounted fixedly and coaxially within said valve casing at said outlet port, said tubular guide member having a first annular peripherally extending surface at one axial end thereof, a hollow slide means positioned coaxially within said valve casing and spaced from said valve casing to define an annular fluid chamber therebetween, said slide means comprising a hollow cylindrical valve plug and a hollow valve cylinder connected thereto, said valve plug having a second annular peripherally extending surface at one axial end thereof, said valve plug being disposed such that said second annular surface is located in flow restricting relationship relative to said first annular surface on said tubular guide member to thereby define a variable flow control passage between said first and second annular surfaces, a support element fixedly mounted on said tubular guide member, said support element extending coaxially into said hollow slide means, a spring means disposed coaxially within and enclosed within said hollow slide means, said spring means being biased between said support element and said slide means to urge the slide means axially away from said tubular guide member, said valve cylinder having a plurality of ports permitting the flow of fluid from said annular chamber into said hollow slide means such that the pressure of fluid in said hollow slide means is equal to the pressure in said annular chamber, an orifice plate carried by said slide means for movement within said valve inlet port and having at least one aperture therein for the flow of fluid therethrough from said inlet port to said annular chamber such that the pressure differential on opposite sides of the orifice plate is counterbalanced by the bias of said spring means to thereby effect constant flow regulation, said cylindrical valve plug having an outer diameter at the axial end portion thereof which is closer to said outlet port which is equal to the inner diameter at the other axial end portion thereof to effect pressure balancing of the valve plug.

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