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Valve actuator project

Discussion in 'Sensors and Actuators' started by nashrack, Oct 7, 2013.

  1. nashrack

    nashrack

    3
    0
    Oct 7, 2013
    I am installing a valve actuator that will control a pool valve which controls whether water in return pipe goes to pipe A or pipe B. The actuator uses 24v. I need to turn the valve to send water to pipe A at 8am and then turn it at 10am to send the water to pipe B at 10am. This process will repeat daily.
    The actuator has 3 wires (x, y, z). 24v needs to be applied to x and y to turn it one way and to y and z to turn it the other way.
    I am thinking of buying a timer (like GE 15154) and a 24v transformer (like PSPRO-24VAC40). This should take care of timing and voltage parts. I am not sure how to send the output voltage to different wires of the actuator at different times - to xy at 8am and to yz at 10am.
    What are the options for building something like this? The pool companies sell systems to do this but they're very expensive.
     
  2. shrtrnd

    shrtrnd

    3,672
    453
    Jan 15, 2010
    Check into timer boxes themselves, not just for re-sale by pool companies, who mark-up
    the price.
    Maybe they're mostly fancy LCD read-out anymore, but I've been using the old electrically
    operated geared-clock timers for years with no problems. A motor drives a geared
    wheel with mechanical stop pins that you push-in or pull-out to set the time you want
    the circuit or circuits to activate or deactivate. There are single or mulitiple-use ones,
    they're simple and highly long-life.
    I'm not around one right now to give you a company name, and you may WANT one of
    those fancy LCD boxes/completely solid-state ones.
    From my description you might be able to Google them.
    Always try to find what you need from an electrical supply warehouse store, or from
    the manufacturer, not from a third-party like the pool company. Avoid the middle-man.
     
  3. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,266
    Nov 28, 2011
    So you need to supply continuous 24V (DC I assume?) between either wires X and Y, or between wires Z and Y, depending on the time of day?

    There are lots of "proper" ways to do this, but for something that's quick to set up, you can use a permanently running 24V power supply feeding through a changeover (SPDT or SPCO) relay that's controlled by a power supply that is powered from a 24-hour switch like the GE-15154 you mentioned.

    So you will need a power supply to provide the voltage for the valve actuator; one side of it connects to wire Y (the common wire) and the other side connects to the common contact of the relay. The other two contacts of the relay (normally closed and normally open) connect to the X and Z wires of the valve actuator, so the relay directs the power supply voltage either to wires X and Y, or wires Z and Y, depending on the state of the relay.

    Then you need to control the relay from the timer. One way is to use another power supply, which is powered from the timer and is designed to drive the relay coil. This could be 12V DC or 24V DC.

    A simpler option is to use a relay with a mains-voltage-rated AC coil. You did not say where you live, or what your mains voltage is, but the GE-15154 seems to be a 115 VAC unit, so you would use a relay with a 115 VAC coil. The coil would connect straight to the switched socket on the timer.

    Suitable-looking relays on Digikey in order of increasing price:
    24VDC through-hole http://www.digikey.com/product-detail/en/G5LE-14 DC24/Z1013-ND/280370 USD1.37
    24VDC chassis mount http://www.digikey.com/product-detail/en/G8P-1C2T-F DC24/Z218-ND/355236 USD 5.03
    115VAC through-hole http://www.digikey.com/product-detail/en/RT424615/PB971-ND/1095295 USD 5.76
    24VDC socketable http://www.digikey.com/product-detail/en/XT424024/PB1195-ND/1841563 USD 5.88
    115VAC socketable http://www.digikey.com/product-detail/en/XT424S15/PB1201-ND/1841569 USD 7.37
    120VAC chassis mount http://www.digikey.com/product-detail/en/LY2F-AC110/120/Z787-ND/126861 USD 12.44

    P.S. Welcome to the Electronics Point forums :)
     
  4. nashrack

    nashrack

    3
    0
    Oct 7, 2013
    Thanks for the ideas. Appreciate your help.
     
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