Usun Model: US-GBD Pneumatic Gas Pressure Booster Pump System for Oxygen/Nitrogen/CO2 Cylinder Refilling

Product Description

USUN Model :US-GBD 160MM driven double action pneumatic gas booster
system for oxygen /CO2 /nitrogen cylinder refilling
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: GBD40 Gas booster pump)

Air drive piston area ( 160mm Ø)

Hydraulic plunger area ( 25mm Ø)

Actual ratio = 40:1

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 SECTION
The 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 underground
coal 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 consult
USUN 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 features
1. Realiable ,Easy to Maintain ,compact and robust
2. No heat,flame or spark risk
3. Infinitely variable cycling speed and output
4. Air driven Models do not require electrical connection ,easy to apply automatic controls
5. No limit or adverse affect to contineous stop/start applications
6.Seals system designed for long working life,No airline lubricated required
7.Built-in coupling system (Most models) and suitable for most gases boosting
Main technical data

List items	Function
1) Air regulator valve	Adjustable air regulator used to adjust the air driven pressure ( 0-10 bar)
2) Air pressure gauge	Indicates the air driven pressure
3) Gas inlet Pressure gauge	Indicates the inlet gas pressure supply
4) Gas outlet pressure gauge	Indicates the outlet boosted pressure
5) Hand drive switch	Used to adjust the system on/off
6) Inlet needle valve	Used to stop the booster when supply pressure fails to the adjust set point ,can be optional .
7) Outlet needle valve	Used to stop the booster when outlet pressure reaches the adjusted set point
8) Uploading needle valve	Used to protect the booster and other components over pressurization and release the high pressure
9) GBD double acting gas booster pump	Used to increase the pressure from low pressure to high pressure
10) Gas filter	Our standard system does not include such part ,if you need ,should inform in advance
11) High pressure Buffer tank	It does not include the system and should be informed if you need it
12) High pressure safety valve on output	It does not include the standard system and should be informed if you need it

Typical technical data for air driven gas booster pump

Model	High pressure piston rod diameter	Pressure ratio	Minimum inlet pressure PI(Bar)	Maximum inlet pressure PI ( Bar )	Maximum Outlet pressure PO(Bar)	Outlet pressure formula PO	Inlet port size	Outlet porst size	Maximum Flow rate L/min= 7 Bar
GBD07	63	7:1	3.4	56	56	7PA+PI	NPT3/8''	NPT3/8''	392@PI=7
GBD10	50	10:1	6.5	80	80	10PA+PI	NPT3/8''	NPT3/8''	352@PI=7
GBD15	40	15:1	8.1	120	120	15PA+PI	NPT3/8''	NPT3/8''	289@PI=10
GBD25	32	25:1	15	200	207.5	25PA+ PI	NPT1/4''	NPT1/4''	186@PI=20
GBD30	28	32:1	18	240	240	32PA+PI	NPT1/4''	NPT1/4''	165@PI-20
GBD40	25	40:1	25	320	332	40PA+PI	NPT1/4'	NPT1/4''	273@pi=40
GBD60	20	60:1	32	480	498	60PA+PI	NPT1/4''	NPT1/4''	175@PI=40
GBD100	16	100:1	40	800	830	100PA+ PI	NPT1/4''	NPT1/4''	136@pi=60

Remark 1) Maxium outlet pressure are at an air driven pressure of 8 bar or 116 PSI ,for long life using
of such pump ,we suggest that air driven pressure should be not more than 8 Bar .
Typical application of such double action gas booster
Product Applications
Factory corners

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