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  1. #1
    Join Date
    Oct 2012
    Location
    Lethbridge Alberta
    Posts
    4

    Hydronics 3-Way Valve Port Identification ABC

    I have an old system where the ports are labelled A,B,C. Which port is the common port? I am familiar with A,B and AB but need to identify this valve so I can replace the actuator. The actuator is a Powers M/N 598-028 and I can not seem to find a cross. Belimo can supply an actuator if I can give them enough info. I will also need to replace the controller as it is a Johnson M/N TC-4100-31 operating on 24 volts with a 0-18 vdc signal. Does anyone know of a company who could provide a cross reference for these parts?

  2. #2
    Join Date
    Dec 2008
    Location
    Dixiana, AL
    Posts
    2,611
    Can you not look at the piping and tell which port is which from the direction of flow???

  3. #3
    Join Date
    Jul 2001
    Location
    Canada
    Posts
    1,814
    Old POWERS 598-028 is now SIEMENS 271-03004

  4. #4
    Join Date
    Jul 2001
    Location
    Canada
    Posts
    1,814
    That # should be 598-0028 and the old POWERS valves identified their ports with U B C , stem down flow C to U with B ( bottom )closed stem up flow B to C and U closed U is same as A on other brands

  5. #5
    Join Date
    Mar 2011
    Location
    North Carolina Piedmont Area
    Posts
    449
    Do you know what type of valve it is? Is it a mixing valve or diverting valve. What is the application, such as for steam use, hot water, or chilled water.

    Here is something from Schneider.
    Attached Images Attached Images

  6. #6
    Join Date
    Oct 2012
    Location
    Lethbridge Alberta
    Posts
    4
    Thanks for the input so far. I suspect the valve to be a mixing valve. This system was installed in the early 60's. It originally had Barber-Coleman controls. The controller was still mounted but disconnected before my time. The valve itself looks original with the following numbers that were difficult to read A-620-1-? , 411C-1, 3 105 The ports are clearly embossed A,B and C. This is a hot water heating system feeding a heat exchanger with a glycol loop for the main air handler. The A port is connected to the inlet of the heat exchanger. The B port is fed by the supply header from the boiler. Water comes out of the heat exchanger and passes through a pump, then is teed to C port and back to boiler return header. The bottom of the T is the B port. The Actuator and Controller were replaced about 25 years ago I estimate. The signal from the Johnson board was modulating 5-18 vdc when I was adjusting setpoint. Would this be compatible with the Siemens Actuator? Thanks Again.

  7. #7
    Join Date
    Dec 2003
    Location
    Northern VA
    Posts
    622
    Quote Originally Posted by Control Man View Post
    That # should be 598-0028 and the old POWERS valves identified their ports with U B C , stem down flow C to U with B ( bottom )closed stem up flow B to C and U closed U is same as A on other brands
    Thanks, Control man, I'll take that for future use.
    "Iron sharpeneth iron..."

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