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http://indianaquariumhobbyist.com/community/ :: View topic - Co2 needle valve problem
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Co2 needle valve problem
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crazzyarchh
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PostPosted: Sun Apr 08, 2012 12:34 am Post subject: Co2 needle valve problem Reply with quote

 I  purchase  a  new  regulator  and  fitted  it  with  the  needle  valve  which  i  have  used  with  my  earlier  setup.  when  i  open  the  main  valve  of  the  cylinder  the  pressure  goes  to  60kg/cm3  which  is  ok  but  as  soon  as  i  try  to  adjust  the  bubble  rate  using  the  needle  valve  the  pressure  in  the  second  gauze  shoots  up  to  the  max  limit  and  gas  starts  escaping  through  the  high  pressure  outlet  (im  not  sure  what  its  called).
 also  the  regulator  and  the  top  part  of  the  cylinder  become  very  cold.
 what  seems  to  be  the  problem?  is  the  needle  valve  faulty?
 the  regulator  is  new  and  seems  to  work  fine....
 
 https://picasaweb.google.com/113713146055624525118/April72012#5728727967626042290
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vkv
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PostPosted: Sun Apr 08, 2012 12:46 am Post subject: Re: Co2 needle valve problem Reply with quote

 Dont  know  what  you  mean  by  high  presssure  outlet  but  gas  tends  to  leak  if  you  have  not  opened  the  main  valve  completely.  
 The  coldnesss  definitely  means  a  leak  -try  the  soap  water  test  to  locate  the  leak.
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aquariumer
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PostPosted: Sun Apr 08, 2012 1:04 am Post subject: Re: Co2 needle valve problem Reply with quote

 you  have  not  mentioned  anything  about  controlling  flow  at  your  regulator  level
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crazzyarchh
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PostPosted: Sun Apr 08, 2012 10:55 am Post subject: Re: Co2 needle valve problem Reply with quote

 @  vkv...theres  an  outlet  below  the  regulator  knob,  thats  what  im  referring  to.
 also  which  main  valve  should  i  open  completely  the  cylinder  one  or  the  regulator  one.
 
 @emmanuel...the  valve  at  the  regulator  lvl  is  not  opened  fully  as  the  output  is  too  much,  it  is  almost  closed  as  i  was  trying  to  adjust  a  low  flow  rate.
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vkv
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PostPosted: Sun Apr 08, 2012 11:02 am Post subject: Re: Co2 needle valve problem Reply with quote

 Steps  are
 1)  Make  sure  the  regulator  valve  and  needle  valve  are  completely  closed.  Remember  the  regulator  valve  is  usually  reversed.  i.e.  when  you  think  you  are  closing  it  you  might  be  opening  it  -  thats  what  I  think  is  happening  in  your  case.
 2)  Open  the  cylinder  valve  completely  -  the  one  at  the  top  of  the  cylinder.
 3)at  this  point  the  inner  gauge  should  read  the  max  pressure  and  the  outer  gauge  must  be  at  0.
 4)  If  the  cylinder  valve  is  not  opened  completely  -  you  will  see  gas  escaping  along  with  a  hissing  noise.
 5)  Now  open  the  regulator  valve  slowly  and  you  should  see  the  pressure  on  the  outer  gauge  begin  to  rise  slowly.  You  need  to  set  this  at  minimal  pressure.
 6)  at  this  point  you  should  do  the  soap  water  test   to  ensure  there  are  no  leaks  anywhere.
 7)  Now  open  the  needle  valve  and  you  should  see  CO2  start  to  bubble.
 
 HTH.  There  is  a  great  thread  by  Trevor  on  the  forums  on  how  to  set  up  the  CO2  cylinder  in  case  you  haven;t  already  read  it.
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crazzyarchh
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PostPosted: Sun Apr 08, 2012 11:13 am Post subject: Re: Co2 needle valve problem Reply with quote

 Thanks  vkv...i  tried  it,  the  problem  is  that  if  i  keep  the  needle  valve  fully  closed  the  pressure  shoots  up  in  the  second  gauze  and  escapes  also  the  regulator  valve  isnt  able  to  stop  the  flow  fully,  a  little  gas  keeps  flowing  even  if  i  turn  it  completely  off.
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Deathstar
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PostPosted: Sun Apr 08, 2012 11:28 am Post subject: Re: Co2 needle valve problem Reply with quote

                                                   
crazzyarchh  wrote  (View  Post):                
a  little  gas  keeps  flowing  even  if  i  turn  it  completely  off.                

 
 Then  u  have  the  same  problem  i  had  Sad  
 buddy  your  cylinders  main  valve  has  problems,  get  that  changed
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vkv
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PostPosted: Sun Apr 08, 2012 11:50 am Post subject: Re: Co2 needle valve problem Reply with quote

 Sounds  like  a  regulator  issue  to  me  from  what  you  describe.
 
 Pressure  in  the  second  gauge  should  be  controlled  by  the  regulator  valve.  If  you  see  that  shooting  up  even  when  the  regulator  valve  is  closed,  then  likely  the  regulator  has  a  problem.
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crazzyarchh
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PostPosted: Sun Apr 08, 2012 11:53 am Post subject: Re: Co2 needle valve problem Reply with quote

 @  pavan..i  meant  the  regulator  valve  not  the  cylinder  valve.
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Deathstar
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PostPosted: Sun Apr 08, 2012 12:07 pm Post subject: Re: Co2 needle valve problem Reply with quote

 oh  sorry  i  misunderstood  it  for  the  cylinder.
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Deathstar
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PostPosted: Sun Apr 08, 2012 12:14 pm Post subject: Re: Co2 needle valve problem Reply with quote

 Is  the  gas  escaping  through  this  outlet?
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crazzyarchh
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PostPosted: Sun Apr 08, 2012 12:21 pm Post subject: Re: Co2 needle valve problem Reply with quote

 yes  pavan
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Deathstar
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PostPosted: Sun Apr 08, 2012 12:29 pm Post subject: Re: Co2 needle valve problem Reply with quote

 You  are  controlling  the  flow  from  regulator  rite?
 
 first  open  the  main  valve,dont  control  through  it  ,  then
 slowly  open  the  valve  of  the  regulator,  very  slowly  .
 then  adjust  desired  bps  by  the  needle  valve.
 then  see  if  its  working
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Madan
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PostPosted: Sun Apr 08, 2012 1:43 pm Post subject: Re: Co2 needle valve problem Reply with quote

 The  cylinder  shut  off  valve  is  turned  clockwise  to  close  and  anti  clockwise  to  open.
 
 First  Close  the  cylinder  shut  off  valve.
 
 The  regulator  pressure  adjusting  valve  opens  clockwise  and  closes  anti  clockwise.
 
 Close  the  regulator  pr  adjusting  valve.  (  Turn  it  fully  anticlockwise  until  it  is  loose)
 
 Now  open  the  cylinder  shut  off  valve  -  open  this  anticlockwise  fully.
 Check  with  soap  water  for  leaks  at  the  cylinder  and  connection  to  regulator.
 The  Pr.  Gauge  closest  to  the  cylinder  should  be  about  55  -  60  bar.
 
 Now  open  the  regulator  pressure  regulating  valve  clockwise  till  you  see  a  pressure  of  1-  2  bar  on  the  output  gauge  (  farther  away  from  the  cylinder).
 Check  for  leaks  with  soap  water  at  the  tubing  connections  etc.,
 
 Control  flow  with  needle  valve.
 
 Do  this  and  revert.
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crazzyarchh
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PostPosted: Sun Apr 08, 2012 2:34 pm Post subject: Re: Co2 needle valve problem Reply with quote

 @Madan...
 I  turned  the  cylinder  valve  fully  on  with  both  the  regulator  and  needle  valve  fully  closed,  but  as  soon  as  i  do  this  gas  starts  leaking  from  the  alternate  escape  opening  (the  one  circled  in  the  picture)  also  the  outlet  pressure  gauze  touches  its  max  level.
 i  opened  the  needle  valve  slightly  and  the  output  pressure  drops  to  2  kg/cm3  but  the  regulator  valve  was  fully  closed,  still  the  gas  managed  to  reach  the  needle  valve.
 I  think  there  is  some  problem  with  the  regulator  valve  as  it  is  allowing  gas  to  pass  even  in  the  closed  position.
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