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Thread: water line

  1. #1

    Default water line

    Like below drawing, city water flows in 2” copper pipe with 45psi, and then it splits into another 2” line ( (a) line ) and continue to run (b) line.
    There is 2” Ball Valve in the middle of (A) line.

    What happens if the ball valve in (A) line closed half(50%)?
    1) (B) line gets any benefit? More pressure? Or more flow?
    Or,
    2) (B) line’s water volume and pressure remains the same?

    Thanks much,

    --Novice-man
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  2. #2
    Moderator valveman's Avatar
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    If A line is using lots of water, then closing off that line by 50% will give B line more volume and pressure. But now A line will not have enough flow or pressure.

    If A line is not using much or any flow, then closing off a valve to that line will not change anything on the B line.

    You are going to need a storage tank and booster pump if the main line cannot supply enough flow and pressure.
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  3. #3

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    Quote Originally Posted by valveman View Post
    If A line is using lots of water, then closing off that line by 50% will give B line more volume and pressure. But now A line will not have enough flow or pressure.

    If A line is not using much or any flow, then closing off a valve to that line will not change anything on the B line.

    You are going to need a storage tank and booster pump if the main line cannot supply enough flow and pressure.
    From your diagram, what kind of storage tank? closed tank? thanks

  4. #4
    Moderator valveman's Avatar
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    It needs a lid to keep the bugs out but, it needs a screened vent to let air in and out as the level changes.

  5. #5

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    Quote Originally Posted by valveman View Post
    It needs a lid to keep the bugs out but, it needs a screened vent to let air in and out as the level changes.
    Then how to use normal city water pressure when not busy time?

  6. #6
    Moderator valveman's Avatar
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    If the city supply has 45 PSI, using a 40/60 pressure switch will keep the pump from running as long as the city line can keep up. When there is more demand than the city line can supply through the bypass line with a check valve, the pressure will drop to 40 and the pump will be started. This will close the check valve on the bypass line and maintain pressure from the booster and storage tank until no more water is needed. Then the pump will shut off at 60, and as the pressure drops, the bypass line will again supply 45 PSI as long as possible.
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  7. #7

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    Quote Originally Posted by valveman View Post
    If the city supply has 45 PSI, using a 40/60 pressure switch will keep the pump from running as long as the city line can keep up. When there is more demand than the city line can supply through the bypass line with a check valve, the pressure will drop to 40 and the pump will be started. This will close the check valve on the bypass line and maintain pressure from the booster and storage tank until no more water is needed. Then the pump will shut off at 60, and as the pressure drops, the bypass line will again supply 45 PSI as long as possible.
    what is solenoid valve? what function? thanks again

  8. #8
    That's all folks! Gary Slusser's Avatar
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    A solenoid valve to control water flow is installed in the water line and is either normally open or closed, and when power it applied it changes to open or closed until the power is shut off.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

  9. #9

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    Quote Originally Posted by Gary Slusser View Post
    A solenoid valve to control water flow is installed in the water line and is either normally open or closed, and when power it applied it changes to open or closed until the power is shut off.
    If I want to buy that solenoid valve, can you let me know what brand? and how to hook up electricity? thanks

  10. #10
    That's all folks! Gary Slusser's Avatar
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    I don't know brands, there are a number of them. The electric can be run from a flow switch or the pressure switch.
    Gary Slusser Retired (= out of business)
    Click Here to learn how to correctly size or program a water softener.
    CAUTION, as of Nov 12 2013 all YouTube videos showing how to rebuild a Clack valve have an error in them that can cause damage.

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