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Model :US-AT-A
USUN
Model :US-AT20/US-AT28/US-AT40/US-AT64/US-AT80
Usun Model :US-AT type 160mm driven double acting pneumatic hydraulic pressure pump system
General Information for Air driven hydraulic 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: AT100 liquid pump)
Air drive piston area ( 160mm Ø)
Hydraulic plunger area（ 16mm Ø)
Actual ratio = 100:1
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.
Typical applications for air driven Liquid pumps
Key features
1. Realiable ,Easy to Maintain ,compact and robust
2. No heat,flame or spark risk
3. Infinitely variable output pressure and flow capability
4. Air driven Models do not require electrical connection ,easy to apply automatic controls
5. Wide range of models and controls and options
6.Seals system designed for long working life,No airline lubricated required
7. Wide range of standard and customized liquid pump systems
Main technical data for air driven liquid pumps
Typical diagram of such air driven hydraulic pumps
Usun Model :US-AT type 160mm driven double acting pneumatic hydraulic pressure pump system
General Information for Air driven hydraulic 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: AT100 liquid pump)
Air drive piston area ( 160mm Ø)
Hydraulic plunger area（ 16mm Ø)
Actual ratio = 100:1
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.
Typical applications for air driven Liquid pumps
Key features
1. Realiable ,Easy to Maintain ,compact and robust
2. No heat,flame or spark risk
3. Infinitely variable output pressure and flow capability
4. Air driven Models do not require electrical connection ,easy to apply automatic controls
5. Wide range of models and controls and options
6.Seals system designed for long working life,No airline lubricated required
7. Wide range of standard and customized liquid pump systems
Main technical data for air driven liquid pumps
Typical diagram of such air driven hydraulic pumps
