documentclass[border=5mm]{standalone}
usepackage{tikz}
tikzset{
  pump/.style={
    circle,
    draw,
    thick,
    minimum size=1cm,
    path picture={
      draw [thick] (path picture bounding box.north) --
                    (path picture bounding box.east) --
                    (path picture bounding box.south);
      },
  node contents={}
  }
}
begin{document}
begin{tikzpicture}
 node[pump];
end{tikzpicture}
end{document}