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  1. Charlesan

    High Temperature Ball Valves

    Got an application for high temperature ball valves, design temperature 550C,used on gases hydrogen, ammonia also needs to meet full vacuum shutoff, any ideas for starters?
  2. Charlesan

    certification

    Does EN10204 3.1 cover Pressure Testing as well as material certification, seems to be some confusion with different valve suppliers, when we order valves we ask for an EN10204 3.1 cert which we expect to cover hydrostatic and pneumatic testing for the valve most of the valve makers comply with...
  3. Charlesan

    Control Valve-Supersonic Flow-Propylene Gas

    Just starting to look at a project involving a requirement for a number of control valves for propylene gas,inlet pressure 14 barg,outlet pressure 2 barg, done a sizing calculation and the software indicates supersonic flow with a decibel level of 90@ 1 metre,valve size is 1O0mm with the outlet...
  4. Charlesan

    Pump Back Pressure

    Our customer has three pumps supplying an 8" Main Header, one pump is on standby, one pump has been serviced and is delivering 300psig into the 8" header,the other working pump is only generating say 260 psig into the overhead header,consquently the 300psig from the first pump is putting a back...
  5. Charlesan

    Radiation unit converstion

    Hello Looking for radiation effects on valve seats,PTFE,UHMWPE,PEEK,etc Also materials such as 316 stainless and alloys etc Anybody got any info or stites etc Thanks Charlesan
  6. Charlesan

    Compressed Air Ball Valves - Will Not Close

    Thanks jistre,you make a good point about PTFE and "cold flow,coupled with the dirt impaction on the seat and into the cavity should prove to be the problem,going back to PTFE a friend has told me they always used "Acetal" seats on this service for this very reason,I think this is some form of...
  7. Charlesan

    Compressed Air Ball Valves - Will Not Close

    Thanks for that,the ball is stainless steel,agree with your point on rust impaction on the seat,we have also advised the partial stroking of valves as part of the service plan,will let you know what the valve looks like when we get the valve open Thanks Charlesan
  8. Charlesan

    Compressed Air Ball Valves - Will Not Close

    Our customer has 3" Reduced Bore Carbon Steel Ball Valves installed on a compressed air line,used as isolation valves,have been in the open position for long periods,need to isolate the system for work on other parts of the plant but cant close the valves,seats are Virgin PTFE,compressed air is...

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