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  1. WWTraveler

    How to test the butt welding type (inlet) safety valve?

    Here is how we do it at the factory. 1. We test the valve for set point only, using air. 2 We disassemble the valve and ship it to the customer to be welded inline. The valve can not be assembled during the welding process. 3 The valve is then reassembled after hydro. 4 The valve is tested in...
  2. WWTraveler

    Requirement of online hot testing on PSV for boiler

    ASME Sec. I PG-73.4 is a requirement for Manufactures and Assemblers only. It spells out the conditions that allow the Manufacturer to attach the Code "V" stamp. Local Government or Insurer will often dictate the type of testing they will allow. Always check with them before you fully decide...
  3. WWTraveler

    Blow down Ring of a Safety Valve

    The simple version is the lower ring gets the disc off the seat and the upper ring keeps it off the seat.The further apart the rings the shorter the blowdown and the closer the rings are together, the longer the blowdown .
  4. WWTraveler

    liquid trim

    In a relief valve it allows the blow down to be controlled. The ASME code does not address blowdown for a liquid valve but due to customer's demands a "liquid trim" was developed. Basically the nozzle ring has a different angle and the huddle champer will be different from a vapor...
  5. WWTraveler

    How do pressure valves work?

    You can down load the Crosby engineering handbook on relief & safety valves here.http://www.andersongreenwood.com/docnet/library/enghnbk.pdf
  6. WWTraveler

    High Flow/Low Pressure Relief Valve

    Try the ERV valve from Valvtechnologies. Although it is designed for steam, it could probably be used for liquid. The ball valve design should help you for the amount of flow you need and the electronic controller will handle the different set points. Good luck.

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