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TEMPERATURE-REGULATING   VALVES
Two-way temperature-regulating valve

Fire Controlman Volume 04-Fire Control Maintenance Concepts
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Figure 2-10.—Three-way temperature-regulating valve. Two-Way   Temperature-Regulating   Valves Two-way   temperature-regulating   valves   in   liquid- cooling  systems  are  normally  installed  in  the  chilled- water   supply   to   the   heat   exchanger   with   the thermostatic  sensing  bulb  installed  in  the  distilled- water  outlet  from  the  heat  exchanger.  The  basic  opera- tion   of   the   two-way   temperature-regulating   valve   is the   same   as   that   of   the   three-way   temperature-regu- lating  valve.  If  the  temperature  of  the  distilled  water is  above  the  desired  temperature,  the  two-way  valve gradually  opens  to  increase  the  flow  of  chilled  water through  the  heat  exchanger,  which  keeps  the  distilled- water  temperature  at  the  desired  point. Both   the   three-way   and   two-way   temperature- regulating   valves   have   a   manual   override   feature   to provide  uninterrupted  service,  if  the  thermostatic assembly  should  fail  due  to  damage  to  the  capillary tubing  or  any  other  component  of  the  thermostatic assembly.  With  the  use  of  the  manual  override  wheel, you  can  set  the  valve  plunger/piston  in  the  required position  to  operate  the  liquid-cooling  system  by  turn- ing   the   manual   override   wheel   down   (from   right   to left)  until  it  touches  the  spiral  pin  in  the  valve  stem. Beyond  this  point,  the  valve  plunger/piston  is  forced down,  allowing  the  flow  of  cooling  medium  through the  valve.  With  the  use  of  the  installed  thermometers, you  can  decide  if  more  or  less  cooling  is  needed  by 2-13






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