Top quality USUN Model:SD Single drive double action Maximator equivalent air driven oil pressure transfer pump

Usun Model : SD type  Similar Maximator High pressure pneumatic driven oil pressure transfer pump  (  For Oil service Only  )

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: M21-S liquid pump)

Air drive piston area ( 80mm Ø)

Hydraulic plunger area (16mm 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 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.

Key features:

SD pumps are double acting, single air drive head types.

1) Cast iron bodies, carbon steel plungers and polyurethane seals.

2) All S-D pumps are standard with side inlets only.

3) There are two inlets (same side) and two outlets (same side).

4) Maximum air drive pressure 145 psi ,Minimum air drive pressure 15 psi.

Technical data of the SD pump

 Flow chart table  

Exploded view of SD type air driven oil pressure pump