USUN Model : WB06 double stage air
driven Freon Recovery/Transfer/Filling Pump
Usun air driven gas booster pumps are ratio
devices that utilize low pressure compressed air driving
a larger diameter piston (area x pressure) which is linearly
connected to a smaller hydraulic piston/plunger. Using
this ratio principal, a higher hydraulic pressure can be
generated. Usun Pump model numbers reflect the pumps
nominal pressure ratio, while the technical
data indicates exact ratios. The outlet stall
pressure is easy to set by adjusting the air drive
pressure through a simple air pressure regulator. By
multiplying the pressure ratio by the available
shop air pressure, the nominal gas pressure can be
calculated. Example ( Pump Model: GB25 Gas
booster pump) Air drive piston area ( 160mm
Ø) Hydraulic plunger area (32mm Ø) Actual ratio
= 25:1 1. AIR DRIVE SECTION The air
drive section consists of a light weight piston complete with seals
running inside an aluminum barrel. The diameter of the
air piston is 160mm. When compressed air is supplied
to the pump the air pushes the air piston down on a
compression stroke (forces as out of the gas
end). Under the control of pilot pins (poppet
valve) triggered at each end of the stroke 2. GAS DRIVEN
SECTIONThe gas section of a USUN air driven gas booster consisit of 4 main pieces ,the gas barrel ,the piston the check valves and the main high pressure seals . The gaspiston is directly linked to the air piston and it is housedinside the gas barrel and its movements up and down creates the gas flow into and out of the booster through the check valves . The check valves are psring loaded and on the suction stroke .the
inlet check valve opens to the maximum allowing gas into the
gas barrel and on the compression stroke the inlet check valve
closes the discharge check valve opens forcing the pumped
gas into the process
.The main high pressure seals is located on the gas piston and they seal agaist the gas barrel during operation .
and the maximum pressures of the pump ,however the standard
PTFE seals are suitable for both the vast majority of gases
encountered . Other materials of construction can be supplied to meet more aggresive services .The standard serials of booster are not suitable for underground coal mine applications . USUN DO Manufacture models of
air driven gas boosters that are not suitable
for undergroundcoal mine applications .USUN Air driven gas boosters
cycle automatically as the outlet pressure increass
the resistance
also increases and the cycle rate decreases until the pump stops automatically when the out put pressure forces are equal .This is refered to as the stall condition . The pump will restart with a slight drop in the outllet pressure or an increase in the
air driven pressure Booster performance can be affected by a number of conditions , such as freezing of the exhaust muffler or pilot valves ( Which is caused by moisture in air lines ),inadequate inlet air line sizes and dirty filers .When
operating the boosters on a contunuous basis ,we recommend you use a maximum cycle rate of 50-60 cycles per minute . This will both increase service intervals and assist in preventing ice forming at the exhaust . An air supply dryer will also assist in reducing icing up
. USUN Gas boosters have a 120mm stroke thus reducing cycle rates at any given flow and pressure as compared with most other brands . This lower repsective cycle rate res ults in a reduction in freeze-up
condition . To abtain best overall performance ,do not reduce the indicated port size and consultUSUN for flow conditions not shown in charts
Model selection for gas
booster It is very important to remember that the performance of any air driven device is very dependent on the air supply conditions .Restrictions in the air supply can be caused by using a too small air compressor or airlines .The FLOW CHARTS SHOWN in the technical data sheet are based on good conditions
. so please do not "design to the line " allow for losses and inefficiencies The
next question is wheather you want the booster to stall when an
outlet pressure is reached If so ,a simple airline pressure
regulator will suffice ,but remember the flow drops off
dramatically as the booster reaches a stall condition
. If you require flow at a particular pressure ,then you need read the flow cahrts carefully and conservatively
If you need the pump to stop at a certain pressure ,prior to stall ,then an air pilor switches needs to be installed . Key
features1. Realiable ,Easy to Maintain ,compact and robust2. No
heat,flame or spark risk3. Infinitely variable cycling speed and
output4. Air driven Models do not require electrical connection
,easy to apply automatic controls5. No limit or adverse affect to
contineous stop/start applications6.Seals system designed for long
working life,No airline lubricated required7.Built-in coupling
system (Most models) and suitable for most gases boo
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