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Recent content by valvetech

  1. valvetech

    Waterfall control

    Having a pond, with a waterfall myself, I just keep the same rate of flow to the waterfall at all times. This helps with the circulation and filtration of the water naturally. If there is need to slow the flow or restrict it I use a small diverter valve thta you get at any pond supply store. The...
  2. valvetech

    How do pressure valves work?

    The pressure regulating valve works by a force being applied to the spring which is the desired set point, this pushes down on the diaphragm holding the valve in an open position allowing flow through the valve. Somewhere downstream a pressure reading is taken and transfered to the underside of...
  3. valvetech

    Throttle and control valve

    You should contact the manufacturer and give them the information in regards to flow and pressure drops that you wish to maintain. the manufacturer will then be able to tell you what valve you need after doing the appropriate sizing calculations.
  4. valvetech

    BELLOW SEALED GLOBE VALVES

    Look at several websites and you may find what you are looking for: Jordan Fisher/Bauman Masonealan Kammer All of these companies have Bellows valves. Jordan Kammer and Bauman offer Bellows in several models.
  5. valvetech

    Trim No. and Leakage Rate in Globe / Gate valves

    here is a simple look at the most common leakage classes and how valves are tested to establish that leakage rate. ANSI CLASS Class III Maximum Seat Leakage 0.1% of rated valve capacity Test Conditions Air or water @ 50 - 125 F. 45 - 60 psig or Maximum operating...
  6. valvetech

    Calculate flow through control valve

    Try the websites of various valve manufacturers, a lot of them have sizing programs on the site or downloadable from the site. Jordan has one on site. that you can download. It offers globe style, sliding gate and low flow sizing for contro valves and regulators as well as both flow and Cv sizing.
  7. valvetech

    High Flow/Low Pressure Relief Valve

    If you do not need safetey relief you may want to try a back pressure regulator. The valve will stay closed to hold pressure in the line up to the set point and then open to relieve the pressure when it rises above the set point, the media can then be piped back into the system at some other...
  8. valvetech

    Looking for 6" Pressure Reducing Valve (plastic or stainless)

    There are many valve companies that make 6" pressure reducing valves in 316 stainless steel. Jordan and Fisher come to mind. Check out their websites. The point made by Albeto is very valid. try getting the valve sized and you may find that you do not require a 6" valve.
  9. valvetech

    How to choose the best type of valve

    If you are regulating pressure with a control valve you still need the by-pass line. If you use just a control valve, it will restrict flow as the demand decreases and the pressure upstream of your valve can raise and can cause problems with your pump. If you have a by-pass line installed, you...
  10. valvetech

    Test media for thermal relief valve

    Abeltio is right look at the attached ANSI test Standards for valve shut off. They are very specific as to what the test media is. By changing the test media you change the shutoff of the valve as Abeltio pointed out. The manufacturer of the valve should be able to assist you if you need to test...
  11. valvetech

    Slide Gate vs. Globe Valve

    Look on the Jordan Valve web site. www.jordanvalve.com This is a sliding gate valve which I think that you are referring to in your question. You can on this siste see an electronic presentation of how the sliding gate operates. This may assist you in making your decision. It is different from a...
  12. valvetech

    I Need any information you have please !!??

    if you are not looking for saftey relief valves you can add Fisher, Cashco, Jordan or and valve company that makes a back pressure regulator.
  13. valvetech

    DRIPPING VALVE

    I sympathize with you on this one. It sounds like what you need is a solenoid valve that just turns on and off very quickly. Doing this is a small line that has little pressure in the line should enable you to get a small amount of water through the solenoid and to "drip" into your...
  14. valvetech

    Which ball valve to use when high diff. pressure after closing?

    Depending on the actual flow rate of the system, and the required Cv to pass the flow, you might be able to go with any number of some of the globe style fractioanl flow valves on the market. Some can handle Delta p's as high as 344 bar (5000 psig). Again this if dependent on the flow...
  15. valvetech

    ANSI Valve standards

    Any valve sold under that classification would have to meet the standard. To attain the ANSI Standard you would have to go to their website and order a copy of the standard. If you are worried that a valve has worn out after being in use, it would be best have the manufacturer evaluate it for...
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