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2.4: Check Valves

  • Page ID
    3641
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    A YouTube element has been excluded from this version of the text. You can view it online here: https://openoregon.pressbooks.pub/hydraulics/?p=48

    Describe the basic purposes of valves in fluid power systems.

     

    Define the terms: body, ports/ways, spool, poppet, seal, springs, actuation/adjustment methods

     

    Describe the different valve mounting methods: inline, subplate, manifold, cartridge, stack

     

    Draw the schematic symbol and cutaway view of a basic poppet style check valve. Identify direction of free flow. Identify direction of blocked flow.

    Describe how a primitive pressure relief valve can be created with a check valve.

     

    Define cracking and full open pressure.

     

    Discuss the main disadvantage of a basic poppet style check valve in the free flow direction and how a right angle check valve overcomes this disadvantage. Draw a cutaway view of a right angle check valve.

     

    Draw the schematic symbol and cutaway view of a restriction (orifice) style check valve. Identify direction of free flow. Identify direction of restricted flow. Describe how a restriction (orifice) style check valve works.

     

    Draw the schematic symbol and cutaway view of a pilot to open check valve. Describe how a pilot to open check valve works in the absence and presence of pilot pressure.

     

    Draw the schematic symbol and cutaway view of a pilot to close check valve. Describe how a pilot to close check valve works in the absence and presence of pilot pressure.

     

    Describe how check valves are employed in the following applications: foot valves, manual pumps, filters in bidirectional systems, quick disconnects, valve bypasses, clogged filter bypasses

     

    Determine how these 4 flow control valves with check valve bypasses influence speed of extension or retraction.

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