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Ultimately, I Thank all of you for your efforts, from which it can be concluded that for on/off operation the Ball valve is more reliable than other types and also, installation an orifice down stream the valve makes the down stream low press. system more safe.

Thanks all of you, StevenHPerry, No doubt all of the valves can provide dp across at closed position. Your guess is nearly right. I mean capability of maintaning dp across at Fully opened position. BigInch & JLSeagull, I agree with you that the globe is well suited for throttling purpose...

Between Globe,Ball,and Gate, which type of valve is capable of maintaning Differential Pressure better?

Please think about the question carefully. i know what you said about the advantage of varaiable speed with respect to fixed speed in view of energy saving. But, my question isnot about a case study or specific compressor, to review its map. My question is to open a general discussion. As you...

Sorry, i think there is no relation between your reply and my question.

How many does the turn down of a centrifugal compressor vary if its fixed speed driver be substituted by the variable speed(VFD, Hydrocoupling,or ...)?

Sorry, I didnot understand the relation between what you said and my query. More clarification about your purpose can help to the discussion. The matter is not about the dominant of Turbo-expander(TE) over speed or applications of compressor anti-surge line. If you read the whole article you...

Dear members, Hi In regard to Turboexapnder control system, Recently I've read an article, turboexpander control-USPatent Aug.4 1981 (http://www.freepatentsonline.com/4281970.pdf). I' m doubtful about rightness of a part of it that states: "If the turbo-expander should tend to overspeed, the...

Dear members, thanks for your reply. You are absolutely right. I also agree with your explanations about the function and importance of the anti-surge control valve. Its name includes “control” but in fact it is a safety device like a pressure safety valve that acts SUDDENLY. So, it can not be...

Hi dear members, I want to know at what condition anti-surge line control valve shall be equipped with the bypass line? any comment is appreciated.

OK. Regards

thank all people for the comments

thank you but, In the offered matter it is reffered to the hot work for which the double block and bleed can be used for the isolation. but, some pepole consider other criteria required for considering double block and bleed. these criteria are: 1. in high pressure system, operating press...

Dear members, In the gas process plant, where must(or can)the conventional double block and bleed valve be used? any comments is appreciated.