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Where to Get Orifice Valves

My system has orifice valves (Bi-Loop) being used on a vapor system. I am in the process of installing two radiators that were removed in the past. Where does one find orifice valves suitable for radiators.

If not available, where does one find orifice plates I can use with a standard valve.



  • patrick linhardt
    patrick linhardt Member Posts: 134
    new valves


    Glad to hear you want to do it right. The only manufacturer that I know of to make a valve that you can internally adjust to control the amount of steam it allows into the radiator is Marsh. The Model is the r-105. The link is


    Best regards, Pat
  • tls_9
    tls_9 Member Posts: 89


    Call them and tell them you are looking for MEPCO, (Dunham / Bush) Swerv C Steam valves. They have an adjustable orfice in them.

  • patrick linhardt
    patrick linhardt Member Posts: 134
    yes, thanks

    Hi Tom,

    Thanks for the info. I contacted our friendly MEPCO rep and got educated, I should have done more research. The MEPCO model SWRF-C steam regulating valve can be adjusted for use on an orifice design steam distribution system. Quote: "When balancing steam distribution in a heating system, this regulating valve eliminates the lengthly procedure of changing regulating plates (orifices), which requires that unions be disconnected and re-connected.

    Rated up to 30 EDR for 1/2", 140 EDR for 3/4", 160 EDR for 1", and 240 EDR for 1-1/4", now that's a big radiator.

    Adjustment of steam flow through the metering passage is done with the valve in service using a special wrench.
    Similar to the Marsh valve refered to in earlier post. It is good to know some manufacturers still make product for these vintage steam systems.

    Anyone else know of a source for these valves?

    Best regards, Pat
  • tp tunstall
    tp tunstall Member Posts: 63

    we make them. tp
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