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15.2: Operation of a Flow Control Valve and its Scematic Symbol

Fluids 2: Basic Hydraulics · LibreTexts

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    Schematic showing flow control valve function
    Figure \(\PageIndex{2}\): Schematic representation of a flow control valve.

    A flow control valve regulates the speed of an actuator by controlling the flow rate of hydraulic fluid. The basic components of a flow control valve include:

    • A valve body with inlet and outlet ports
    • A tapered adjustment screw
    • An adjustment knob
    • An internal check valve poppet
    • A small spring to assist the poppet function

    This valve can be configured to restrict flow in one direction while allowing near-unrestricted flow in the other. This is accomplished using the check valve in parallel with the variable orifice. The schematic symbol for this type of valve typically shows a variable restriction with a check valve in parallel, often drawn as a parallel line bypassing the orifice.

    Flow control schematic symbol and its explanation
    Figure \(\PageIndex{1}\): Control valve schematic symbol and explanation.

    The control valve schematic symbol is drawn with a needle valve inline with the transmission lines and parallel will be a check valve. A second version provides a ghost line around the device to represent that both components are in the same valve body.

    This page titled 15.2: Operation of a Flow Control Valve and its Scematic Symbol was last modified on Tue, 29 Apr 2025 20:01:31 GMT and is shared under a CC BY 4.0 license and was authored, remixed, and/or curated by Jessy Haid.