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Model :2AF
USUN
Model :2AF120/2AF200/2AF300/2AF450
Usun Model :2AF 6inch diameter driven middle size single action double head pneumatic driven high pressure hydraulic testing pump for vessel or cylinder testing
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.
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
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 diagram of such air driven hydraulic pumps
