NEGATIVE PRESSURE - Circulating and Temperature Control systems

 
NO LEAKS GUARANTEED – QPC's Negative Pressure Systems work below atmospheric pressure. Air pressure outside the mold is always greater than pressure in the cooling channels so the fluid stays inside.
 

QPC Negative Pressure Circulating and Temperature Control systems pull water through a mold or die.
 
We provide three models of negative pressure equipment:
 
Negative Pressure (NP) Water Circulating System pulls water through a mold or die at a lowered pressure using a progressive cavity pump. The pump can move both water and air that may be drawn in from a leak. The air is vented from the system before the water leaves the unit. More information on NP water systems here.
   
Negative Pressure Temperature Control Systems with (NPCL) or without (NPCLN) heating elements. Combines the NP Water Circulating System with an open loop mold heater. More information on NPCL/N systems here.
   
Negative Pressure, High Temperature Control System (NPHT) uses water, ethylene glycol, or oil. (Must use oil under negative pressure for up to 400 degrees F) These systems possess various heating elements depending on voltage and size of unit. More information on NPHT systems here.
 
WATER CIRCULATING SYSTEM:
 
SPECIFICATIONS
  Standard High Return Pressure
  NP-200 NP-300 NP-400 NP-500 NP-100 NP-350
Pump horse power 0.75 0.75 1.50 2.00 0.75 1.50
Maximum Flow (GPM) 9.20 14.60 24.00 52.00 7.20 14.80
Return Pressure (PSI) 40.00 40.00 40.00 40.00 90.00 140.00
Supply and return ports (in.) 0.75 0.75 1.25 1.25 0.75 1.25
Length (in.) 24 24 24 36 24 36
Width (in.) 14 14 14 14 14 14
Height (in.) 33 33 33 33 33 33
Unit Weight (lb.) 120 130 220 250 120 210
Electrical Requirements 208-220/430-480 volt. 3 phase 60 hertz. 100, 200, and 300 available for 110-120/220-240 volt. 1 phase 60 hertz.
Operating Range 40-180°F Max. Recommend ethylene glycol: 30% (for proper air separation)
 
STANDARD:
 
Motor starter relay Positive displacement pump
Motor thermal overload protection Phase monitor relay
Vented heavy duty steel cabinet coated inside and out with the best available paint Safety shut off low supply pressure switch with indicator light (on NP-300 and NP-200 only)
To mold, from mold, supply and return pressure gauges Bronze pressure reducing valves
Bronze inline filter Bonded rubber casters for easy mobility
All copper and bronze plumbing Safety shut off for high return pressure on NP-300 and NP-200
 
HOW TO SIZE UNIT:
 
You can use the tonnage of your molding or casting machine. For example, if you were using a 400-ton press, the average mold that would go into it can be handled by our NP-400 as it would be able to handle the water requirement. This would be true of the NP-300 for a 300-ton press, etc. Note that it is better to be oversized than undersized.
   
If you know the flow through your mold or die, add 25% to it. Then select the closest QPC NP System to the GPM flow rate.
 
NEGATIVE PRESSURE WATER CIRCULATING TEMPERATURE CONTROL SYSTEM:
 
SPECIFICATIONS
  Standard High Return Pressure
  NPCL-200 NPCL-300 NPCL-400 NPCL-500 NPCL-100 NPCL-350
Pump horse power 0.75 0.75 1.5 2.00 0.75 1.50
Maximum Flow (GPM) 9.20 14.60 24.00 52.00 7.20 14.80
Return Pressure (PSI) 40.00 40.00 40.00 40.00 90.00 140.00
Supply and return ports (in.) 0.75 0.75 1.25 1.25 0.75 1.25
Length (in.) 24 24 24 36 24 36
Width (in.) 14 14 14 14 14 14
Height (in.) 33 33 34 33 33 33
Unit Weight (lb.) 120 130 220 250 120 210
Electrical Requirements 208-220 / 430-480 volt. 3 phase 60 hertz. 100, 200, and 300 available for 110-120 / 220-240 volt. 1 phase 60 hertz
Operating Range 40-180°F Max. Recommend ethylene glycol: 30% (for proper air separation)
 
FEATURES:
 
The QPC Negative Pressure Temperature Control System pulls water through a mold or die at a lower pressure using a progressive cavity pump. The pump can move both water and air that may be drawn in from a leak. The air is vented from the system before the water leaves the unit. These systems may be purchased with (NPCL) or without (NPCLN) heating elements.
   
Patented Flow Circuit, US patent 4,3673785
   
NO LEAKS GAURANTEED - The QPC NPHT system works below atmoshperic pressure.
 
STANDARD:
 
1/16 din temperature controller with Autotuning and PID control All copper and bronze plumbing
Positive displacement pump Phase monitor relay
Vented heavy duty steel cabinet coated inside and out with the best available paint Safety shut off low supply pressure switch with indicator light (on NP-300 and NP-200 only)
To mold, from mold, supply and return pressure gauges Bronze pressure reducing valves
Bronze inline filter Bonded rubber casters for easy mobility
 
Optional in coloy heaters: 1.65kw for 110v single phase / 3.5kw for 220v. Single phase / and 3.75kw for 3 phase.
 
HOW TO SIZE UNIT:
 
You can use the tonnage of your molding machine. for example, if you were using a 400-ton press, the average mold that would go into it can be handled by our NPCL-400 as it would be able to handle the water requirement. This would be true of the NPCL-300 for a 300-ton press, etc. Also, note that it is better to be oversized than undersized.
   
If you know the flow through your molds, add 25% to it. Then select the closest QPC NPCL system to the GPM.
 
NEGATIVE PRESSURE HIGH TEMPERATURE CONTROL SYSTEM:
 
SPECIFICATIONS
  NPHT-260 NPHT-300 NPHT-400
Pump horse power 1.5 1.5 1.5
Maximum Flow (GPM) 50.0 50.0 50.0
Heater size @ 240 volts (kW) 4.3 4.3 8.7
Heater size @ 480 volts (kW) 5.7 5.7 11.4
Maximum temperature 260.0 300.0 400.0
Supply and return ports (in.) 1.25 1.25 1.25
LxWxH (in.) 36x14x34 36x14x33 36x17x34
Weight (lb.) 210 230 275
Heat transfer fluid Water-glycol Oil Oil
Electrical requirements: 208-220/430-480 volt. 3 phase, 60 hertz
 
FEATURES:
 
NO LEAKS GAURANTEED - The QPC NPHT system works below atmoshperic pressure.
   
The QPC Closed Loop Negative Pressure, High Temperature Control System pulls cooling fluid through a mold or die at a lowered pressure by a centrifugal pump and a venturi. Unit uses water, ethylene glycol, or oil. (You must use oil under negative pressure for up to 400 degrees F) These systems possess various heating elements depending on voltage and size of unit. A regulator controls the pressure going from the pump to the mold. Fluid returning to the NPHT unit enters the reservoir above the level of the fluid to an area that is held under vacuum.
 
STANDARD:
 
1/16 din temperature controller with Autotuning and PID control Motor starter relay
Positive displacement pump Phase monitor relay
Vented heavy duty steel cabinet coated inside and out with the best available paint Safety shut off low supply pressure switch with indicator light
To mold, from mold, supply and return pressure gauges Vacuum transducers and controls
5.27 gallon stainless steel reservoir tank Fused incoming power
Incoloy heaters Bronze pressure reducing valves and inline filter
Safety shut off high return pressure with indicator light All copper and bronze plumbing
Automatic fill control Air seperation and removal system
1.5ft2 cooling coil Motor thermal overload protection
Bonded rubber casters for easy mobility    
 
OPTIONS:
 
Air mold purge valve to remove all fluids from mold and hoses. (Standard on NPHT-400)
   
Safety vacuum switch to shut down the system if the vacuum drops below safety set point
   
Open loop/closed loop. (Available on NPHT 260 only)
   
2.6ft2 internal heat exchanger (Standard on NPHT 300)
   
4.6ft2 external heat exchanger (Standard on NPHT 400)
   
Positive pressure port for running negative and positive pressures simultaneously. (Available on NPHT 260 only)
   
Communications package permits digital communication via your choice of standards RS-422 or RS-485 ports