Non Standard Model: GH 250 mm Driven High Flow Pneumatic Driven Chemical Injection Pump

Product Description

Customized  Usun Model : GH 250 MM driven high flow pneumatic driven

chemical injection pump for marine use 






General Information for Air driven liquid pumps




 

USUN air driven liquid  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 liquid pressure can be calculated.

 

Exmple ( Pump Model: GH40 liquid pump)

 

Air drive piston area ( 250mm Ø)

 

Hydraulic plunger area ( 40 mm 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 80mm. When compressed air is supplied to

 

the pump the air pushes the air piston down on a compression stroke

 

( forces fluid out of the liquid end).

 

 Under the control of pilot pins (poppet valve) triggered at each end of the stroke

 

2. HYDRAULIC SECTION (Wetted End)

 

The hydraulic section of an air driven liquid pump consists of 4 main pieces, the hydraulic body,

 

the piston/plunger, the check valves and the main high pressure seal. The hydraulic

 

piston/plunger is  directly linked to the air piston and it is housed inside the hydraulic body and

 

its movement up and down creates the liquid flow into and out of the pump through the check

 

valves. The check valves are spring loaded and on the suction stroke the inlet check valve

 

 opens to the maximum allowing fluid into the hydraulic body and on the compression stroke the

 

inlet check valve closes and the discharge check valve opens forcing the pumped fluid into the

 

process. The main high pressure seal is located within the hydraulic body and the piston/plunger seals

 

against this during operation. There are different materials and designs of high pressure seals

 

depending on the fluid being pumped and the maximum pressures of the pump, however the

 

standard seals are suitable for both water and hydraulic fluid use.

 

USUN air driven liquid pumps are self-priming, However, high ratio pumps are more difficult to

 

Prime and may require bleeding. In general, it is not recommended to use an air- line lubricator.

 

USUN  air driven liquid pumps cycle automatically  as the outlet pressure increases the

 

resistance  also increases and the cycle rate decreases until the pump stops automatically

 

when the output  pressure forces are equal. This is referred to as the stall condition.

 

The pump will restart with a slight drop in the outlet pressure or an increase in the air drive

 

pressure. Pump 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 pumps on a continuous 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.

 

To obtain best overall performance, it is recommended not to reduce the indicated port sizes

 

and consult We for flow conditions not shown in charts.

Typical applications for high pressure pneumatic water testing pump 



Key features

One model available in 8 ratios

Compatibility with a variety of liquids

Safe pneumatic operation

Aluminum bodies and wetted materials of carbon steel or stainless steel

Rugged,compact,reliable and easy maintenance proven design

High quality seals, long service life available

No need for air line lubrication

Wide application with large range of pressure ratio

Main technical data 






Typical technical data for Pneumatic driven chemical injection pump  
 

GH serial High flow air water test pump
Air driven pressure at 7Bar ,air consumption at 1.6³/min
Technical data
Model	Piston/Rod diameter ø(mm)	Displacement per stroke(mL)	Liquid In	Liquid Out	Max outlet pressure Bar at 8.3 bar	Outlet pressure PO(Bar)     1Bar=0.1Mpa=1.019Kg/cm²
						0	20	40	70	100	150	200	300	400	500	600	700	900	1200	1700	2350
						Flow rate    (L/min)
GH10T	80	753.98	NPT3/4"	NPT3/4"	83	75.4	60.32	52.78	26.39	0
GH25	50	294.52	NPT3/4"	NPT3/4"	207	29.45	23.56	20.62	17.67	14.73	11.78	8.84	0
GH40	40	188.5	NPT3/4"	NPT3/4"	332	18.85	15.08	13.2	11.31	9.43	8.48	7.54	5.66	0
GH69	30	106.03	NPT3/4"	NPT1/2"	572	10.6	8.48	7.42	6.36	6	5.3	4.77	4.24	3.71	3.18	0
GH100	25	73.63	NPT1/2"	NPT1/2"	830	7.36	6.26	5.89	5.15	4.79	4.42	4.05	3.68	3.31	2.95	2.58	2.21	0
GH156	20	47.12	NPT1/2"	*HF6	1295	4.71	4.24	4.01	3.77	3.3	3.06	2.83	2.59	2.36	2.12	1.88	1.65	1.41	1.18	0
GH190	18	27.99	NPT3/8"	*HF6	1577	2.8	2.52	2.38	2.24	2.1	1.96	1.82	1.68	1.54	1.4	1.26	1.12	0.98	0.84	0
GH240	16	22.12	NPT3/8"	*HF6	2116	2.21	2.1	1.99	1.88	1.77	1.66	1.55	1.44	1.33	1.22	1.11	1	0.93	0.88	0.77	0

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 diagram of such air driven liquid pumps 


 

Product Applications 




 

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