CONDENSATE WATER AUTOMATIC PUMP
WDV20 condensate water automatic pump belongs to a sort of pressure control pump, designed for the occasion where condensate water and other fluid are pumped through the way beyond electric power. Compared with conventional infusion pump, condensate water control pump is very suitable for transmission of “Difficult” medium, such as high temperature condensate water or corrosive fluid. Pressure controlled pump, particular in condensate water automatic pump, are recognized as long-life pump with seldom maintenance needed. The pump is five to ten times the life of traditional ones due to its absence of electromotor, pump impeller and rotary seal structure, at the same time, general maintenance of it will be saved dramatically.
1.It’s necessary to return high-temp condensate water into boiler, in order to save boiler water supply and chemical treating agent, and reduce boiler water supply and the cost of reheating.
2.No need to carry out electrical maintenance.
3.It could be used safely in dangerous and explosive environment.
4.It may be used in gauge pressure with capacity from 5 to 250 Psig (1.72Mpa) according to different types, and compressed air or other air operation and control.
5.Lyophobe may reach maximum volume of 48,000 pounds/hour (22,000Kg/hr)
Condensate water automatic pump discharges liquid by depending on steam or compressed air. Float ball will be linked to connecting rod and spring, simultaneously, drive intake valve and exhaust valve. The intake value will shut down during circulation of liquid charging, at the same time, exhaust valve will open, enabling condensate water into the pump. As the float ball rise with the liquid up to the peak of its journey, the switch control system will set spring free and open intake valve, as well as close exhaust valve. Steam and compressed air subsequently flow into pump and discharge liquid. The check valve that fixed at intake of exhaust of pump will drive the liquid flowing in opposite path.
Lyophobe capacity is determined by several parameters. The thing to be noticed is the fact that it’s discontinuous liquid that condensate water automatic pump released is, the amount of liquid discharging should rest with the speed of circulation. The size of driving pressure and resistance of flowing path are distinct elements and limiting factors. Secondly, it should be attributable to some factors, such as CV value of check valve, the pressure or head of charging liquid, resistance of exhaust pipe, and characteristic of driving gas.
Automatic pump only has entrance side, and no “Vacuum” side. The key issue is that we should be conscious of the fact that such automatic pump in this kind could not pump and suck fluid inside. Medium should flow into the pump in virtue of gravity. The more pressure or head is, more bigger the CV value of check valve is, secondly, more bigger the CV value of exhaust valve is, the more faster the pace of completion of side circulation will be. Upon completion of liquid charging, control system will shun down exhaust valve and open intake valve. At the moment, steam and compressed gas will expel the liquid from pump. There are some factors influencing velocity of circle discharging of liquid, including driving the pressure of steam or air, CV value of check valve of exit back valve, downstream back pressure, along with possibility of flowing medium and temperature of surroundings (In case of taking steam as driving air). The last factor is often ignored, but the fact is that steam will be condensed, therefore, reduce actual driving pressure, such phenomenon could be very serious on some applications.
Collecting tank of condensate water
Generally, conventional electric condensate water pump needs a collector of condensate water, the cubage of it may function as cooling the condensate water and discharging flashed steam. It’s essential, for the suction of pump may reduce the pressure, which could boil the condensate water flowing pump impeller after pumping. Such phenomenon is being called as cavitation，resulting in cavitation erosion and damage of impeller in fast manner. Under most of circumstances, no problem will be occurred relating to the temperature of flowing medium, however, the fact must be remembered that condensate water automatic pump discharges liquid in discontinuous circulation. In addition, control pump equipped with additional pressure added within, which could not accommodate liquid when discharging liquid. It’s necessary to install a collector with adequate capacity in case of continuous discharge of flowing medium toward automatic pump, which may contain the condensate water that reserved in the course of liquid discharging from control pump. Otherwise, the condensate water will return to the top level, causing increment in pressure, ultimately led to trouble.
CONDENSATE WATER AUTOMATIC PUMP
泵的工作原理图Schematic diagram of pump operation
Guidance for selecting condensate water automatic pump
Some specific data are required for choosing proper condensate water automatic pump, in order to meet practical requirement:
1.The load of condensate water, ,kg/hr*
2.Available driving pressure (air or steam)
3.Total head, feet (hydraulic head)
4.The pressure of return pipe
5.Available pressure head of liquid charging
Example 1 steam driving
1.The load of condensate water, 4,000lb/hr(1,800kg/hr)
2.Available steam pressure: 50psig, gage pressure (0.34 Mpa)
3.Total head: 20ft(6.1m)
4.The pressure of return pipe: 10psig, gage pressure (0.069 Mpa)
5.Available pressure head of liquid charging: 12″(0.30m) 50psig, guage pressure (0.34 Mpa)
Pressure head of liquid charging is not equivalent to 12″, water dispensing capacity should multiply the correction coefficient out of table 3.
example 2 air driving (Known condition is the same as example 1)
1.In order to confirm the correction coefficient of water dispensing capacity of water, driving pressure MP should be taken to divide back pressure out of example 1 (BP÷MP) 19÷50=38% the correction coefficient of table 2 is 1.10
2.Using correction coefficient to divide required load of condensate water. 4000÷1.10=3636 selected 1″×1″condensate water pump out of the table showing pump capacity of liquid dispensing (Table 1).
1.Computing of total back pressure. Total back pressure equals to feet of total pressure head multiplies 0.433, then add pressure of return pipe. （20ft×0.433）+10psig gage pressure=19
2.Single out driving pressure out of the table showing pump capacity of liquid dispensing, total back pressure exceeds 1″×1″condensed water pump under gage pressure of 19（25）psig.
conversion coefficient of unit
Converted GPM into lbs/hr:GPM×500
Converted Lbs/hr into GPM：Lbs/hr×0.002
Converted Lbs/hr into kg/hr:Lbs/hr×0.454