I worked in a hydraulics design field for two years and found that unfortunately there isn't a standard way to draw many components. Each manufacturer seems to choose their own route. Designers are left to redraw or interpret components and sometimes hybrid symbols are created making the problem worse.
Information about what your project does and what you think the component does would be helpful. Also knowing the vendor or a recommended manufacturer would be helpful in hunting it down.
My best guess is that it is a poorly drawn check valve. The little spring drawn on it, most likely means that it is spring actuated (spring closed) and has some backpressure. Here are some check valve symbols it is similar to. I suggest you evaluate your hydraulic circuit and see if a check valve makes sense in that location before fabrication.
ISO Spring-loaded ball-type non-return valve
Check Valve Symbol on Wiki
ProfiCAD Symbol Library
ConceptDraw symbol library