Individual piston check valves direct flow from the inlet side of the pump to the outlet port in these high pressure hydraulic pumps. The positive-seating checkball valves provide better wear and high volumetric efficiency, especially at high pressure. These checkball pumps operate at pressures to 20 000 psi (1380 bar).
During checkball pump operation, a fixed-angle wobble (cam) plate rotates with the drive shaft, causing the pistons to reciprocate. During its suction stroke, each piston is filled through its inlet check valve. During compression, the inlet check valve closes and pressure in the pumping chamber rises until it exceeds load pressure. The outlet checkball then lifts off its seat and fluid is pumped out of the chamber.
The checkball pump design is ideal for hydraulic systems with demanding conditions including:
These high pressure pumps accommodate more force in a smaller package. At lower pressures, the pumps provide the life and performance margin essential in critical environments.
Fixed displacement pumps -
Flows from 0.22 to 60 U.S. gpm (0,83 to 227 L/min) at 1800 rpm,
Pressures to 20 000 psi (1380 bar)
Variable delivery pumps -
Maximum flows from 12.7 to 60 U.S. gpm (48,1 to 227 L/min) at 1800 rpm,
Pressures to 8500 psi (590 bar)
This is a partial list which is updated regularly. Not all compatible fluids are shown here.
|ACT FR WG 200-D|
|Castrol Transaqua HT|
|Citgo Glycol FR-40 XD|
|Citgo Glycol FR-5046 HP|
|Houghton Aqualink 300|
|Houghton Aqualink HT-804|
|Ucon Hydrolube HP-5046|
Other Water-Based Fluids
Diesel Calibration Fluids
Biodiesel Fuel Production
|MIL-C-7024C Type II (Stoddard solvent)|
Other Synthetic Fluids
|Quintolubric 822 (Polyol ester)|
|Milicron Cimtech 310|
|Castrol Ilocut 334|
This specification briefly defines the main attributes of a portable helicopter refuelling system. The system is designed for open line refuelling of turbine powered rotary wing and small fixed wing aircraft at flow rates of up to 225 litres / minute using Jet fuel.