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Thread: LLSV

  1. #14
    Join Date
    Dec 2005
    Posts
    1,918
    Quote Originally Posted by synergy View Post
    ... Swapped the internal diaphram and head assembly out from another new valve, same thing. ...
    You swapped the guts does not mean the LLSV is brand new. Maybe the old body is damaged. Until you swap the whole valve.

  2. #15
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,670

  3. #16
    Join Date
    Jul 2011
    Location
    Columbus, Ohio
    Posts
    136

    Red face Stem down

    The valve will operate normally with a lower pressure differencial. At 225 psig head and a 60 psig suction it will close off, pump down like normal to 30 psig, compressor shuts off on low pressure control, and the valve does not leak by. But At 275/60 psig it stays wide open with no power to the coil. Even pulled the coil off the stem to be sure. Stays wide open and the only way to shut off the compressor is the main breaker, or closing the king valve. Like spaceman said, it makes no sence.

  4. #17
    Join Date
    Jul 2011
    Location
    Columbus, Ohio
    Posts
    136

    Buy Sporlan

    Piped in new sporlan LLSV, no problems, works as it should. The alco valve removed is shiney, clean, no appartent damage of any kind. I will go out of my way to buy Sporlan in the future.

  5. #18
    Join Date
    May 2003
    Location
    Utah
    Posts
    732
    Quote Originally Posted by synergy View Post
    The arrow on the valve is pointed to the TXV, it is in the right way. Don't know what caused the original failure, but this problem is on my short list. It is like 200 PSI Diff is the maximum it can close against, but that seems like a normal application demand of a LLSV. Maybe a flow thing? To much liquid velocity? 15 ton compressor, 27 Lb charge, R-22, through a 7/8 liquid line. It all seems like the right fit, but two valves doing the same thing at the same point, makes one wonder.
    The MOPD of the valve is the pressure that, when exceeded, the electro-magnetic force generated by the coil when energized is insufficient to pull the valve's plunger up to the top of the enclosing tube.

    The MOPD has nothing to do with whether the valve will close or not.

    Barring a mechanical or contaminated problem, solenoid valve failure to close is commonly caused by an oversized valve. Oversizing results in too little pressure differential across the valve port....the pressure on top of the disc must be a minimum 1/2 lb greater than the pressure below the disc or the valve will be in danger of not closing.

    Solenoid valves should be selected based upon capacity, not line size.

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