Is there a way to alter the pressure drop across a check valve?

Pressure at my check valve is 174 PSI and directly downstream of it is 103 PSI. Is there a way to change the dimensions of the check valve or to somehow reduce the pressure drop across it?

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  • Hello Yusuf,

    Are you looking at steady state or EPS results in WaterGEMS or WaterCAD, or are you looking at transient results in HAMMER? Are these pressures seen at a specific timestep, or the max pressure? Is this the check valve node element, or from a check valve specified in the pipe properties?

    Generally speaking the check valve node element does not include any headlosses except during a transient simulation when the valve is partially closed (see "headloss across check valve node" in this article). If you have the check valve set in your pipe, check the "headloss (minor)" and "headloss (friction)" in the "Results" section of the properties. If the minor losses are high, check your pipe's minor loss coefficients.

    If you're observing these pressures at junctions on either side of the check valve, the difference could be due to a difference in elevation, as the pressure is measured as the difference between the hydraulic grade and the physical elevation. It is better to compare hydraulic grade to determine headloss.

    You may also want to check the calculated Status field in the Results section of the properties, to see if the check valve might actually be closed (and possibly reversed to what you thought it was - check the to/from field)

    If this does not help, please provide a copy of the model for review, with steps to reproduce: Sharing Hydraulic Model Files on the OpenFlows Forum


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows Products
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

Reply
  • Hello Yusuf,

    Are you looking at steady state or EPS results in WaterGEMS or WaterCAD, or are you looking at transient results in HAMMER? Are these pressures seen at a specific timestep, or the max pressure? Is this the check valve node element, or from a check valve specified in the pipe properties?

    Generally speaking the check valve node element does not include any headlosses except during a transient simulation when the valve is partially closed (see "headloss across check valve node" in this article). If you have the check valve set in your pipe, check the "headloss (minor)" and "headloss (friction)" in the "Results" section of the properties. If the minor losses are high, check your pipe's minor loss coefficients.

    If you're observing these pressures at junctions on either side of the check valve, the difference could be due to a difference in elevation, as the pressure is measured as the difference between the hydraulic grade and the physical elevation. It is better to compare hydraulic grade to determine headloss.

    You may also want to check the calculated Status field in the Results section of the properties, to see if the check valve might actually be closed (and possibly reversed to what you thought it was - check the to/from field)

    If this does not help, please provide a copy of the model for review, with steps to reproduce: Sharing Hydraulic Model Files on the OpenFlows Forum


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows Products
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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