Network[{Node[1, NodePosition -> {169., 244.}], 
   Node[2, NodePosition -> {73., 52.00000000000001}], 
   Node[3, NodePosition -> {253., 52.00000000000001}], 
   Node[4, NodePosition -> {169., 172.}], 
   Arc[{1, 1}, ArcCircleHeight -> -1., ArcLoopClockwise -> True, 
    ArcLoopAngle -> 1.531646653589793, ArcLoopSize -> 64.148506, 
    ArcFlipped -> False], Arc[{3, 2}, 
    ArcBezierPath -> {{-0.398164, 0.420815}, {0.398164, 0.420815}}, 
    ArcCircleHeight -> 0.315611, ArcLoopClockwise -> False, 
    ArcLoopAngle -> 3.141592653589793, ArcLoopSize -> 0., 
    ArcStyle -> Circle, ArcFlipped -> True], 
   Arc[{3, 2}, ArcBezierPath -> 
     {{-0.398164, 0.420815}, {0.398164, 0.420815}}, 
    ArcCircleHeight -> 0.315611, ArcLoopClockwise -> False, 
    ArcLoopAngle -> 3.141592653589793, ArcLoopSize -> 0., 
    ArcStyle -> Circle, ArcFlipped -> False], 
   Arc[{1, 4}, ArcBezierPath -> {{-0.333333, 0.}, {0.333333, 0.}}, 
    ArcCircleHeight -> 0., ArcLoopClockwise -> False, 
    ArcLoopAngle -> 3.141592653589793, ArcLoopSize -> 0., ArcStyle -> Line, 
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    ArcBezierPath -> {{-0.333333, 0.}, {0.333333, 0.}}, 
    ArcCircleHeight -> 0., ArcLoopClockwise -> False, 
    ArcLoopAngle -> 3.141592653589793, ArcLoopSize -> 0., ArcStyle -> Line, 
    ArcFlipped -> False], Arc[{4, 3}, 
    ArcBezierPath -> {{-0.333333, 0.}, {0.333333, 0.}}, 
    ArcCircleHeight -> 0., ArcLoopClockwise -> False, 
    ArcLoopAngle -> 3.141592653589793, ArcLoopSize -> 0., ArcStyle -> Line, 
    ArcFlipped -> False]}, ArcArrow -> False, ArcArrowAngle -> 0.4, 
  ArcArrowColor -> GrayLevel[0.], ArcArrowFlare -> 0.3, 
  ArcArrowPosition -> 1., ArcArrowSize -> 17., ArcColor -> GrayLevel[0.], 
  ArcLabel -> "", ArcLabelColor -> GrayLevel[0], ArcLabelDistance -> 0., 
  ArcLabelPosition -> 0., ArcLabelSide -> Right, 
  ArcLoopBezierPath -> {{1.333333, -1.333333}, {-1.333333, -1.333333}}, 
  ArcLoopStyle -> Circle, ArcThickness -> 1., NodeAnnulusRatio -> 0.2, 
  NodeColor -> GrayLevel[0.], NodeLabel -> None, NodeLabelAngle -> -0.891232, 
  NodeLabelColor -> GrayLevel[0], NodeLabelDistance -> 0., NodeSize -> 3., 
  NodeStyle -> Disk, PlotRange -> {{0., 325.}, {330., 5.}}, 
  ArcLabelFont :> $DefaultFont, NodeLabelFont :> $DefaultFont]