USUN Model:ZB 160MM driven air driven liquified gas or refrigerant pumps for recovery LPG

Usun Model :ZB05  160 MM driven Air driven liquified gas or refrigerant pumps for recovery refrigerants

ZB series of liquid pumps are unique in the USUN range as they use pistons rather than plungers in the liquid ends.

This enables them to achieve high pressure fluid outlet flows in both directions of the reciprocating pump action, 

making them double acting and very efficient. All ZB Series pumps are suitable for liquids, gases and vapours. 

They are also capable of drawing a vacuum down to 11.25 psi(absolute) in the 2-stage configuration.

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:ZB05 liquid pump)

Air drive piston area ( 160mm Ø)

Hydraulic plunger area（  80 mm Ø)

Actual ratio =4:1

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.

Typical Applications for such pneumatic driven liquified gas or Refrigerant pumps  

Transfer, at pressure, of water, LPG, SF6, Freons and other refrigerant fluids.

CO2 Fire Extinguisher filling.

Hydro-static Pressure testing.

Critical Extraction.

The transfer and/or extraction of LPG, LNG Freon and

Refrigeration Fluids. Dust suppression.