Liquid pumps - Haskel International - (Version JPG) - Page n° 4 - PDF Catalogue | Technical Documentation

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Pump, Air compressor, High pressure valve, Stationary compressor, Diaphragm compressor

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Principle of Operation

Double and Triple Air Head Pumps

The pressure capability of the pumps in the 1 5 horse power (hp) (1 12 kw) range can be extended by stacking air pistons on top ot each other (o double oi triple the intensification ratio without changing the hydraulic piston The double or triple air head pumps consume 'ess air than competitors pumps with a single air piston of equivalent area since only one of Ihe two or three heads is pressurized on (he relurn s(roke

The addition ol a second and 'hird air head increased Ihe pump hp from approximately 1 5 to 2 hp{1 12 Kw)

Double air head pumps are identified by the last digit 2 m the pump model number Thus, a nominal 50 i ratio pump with two air heads is described as a 52, similarly, a triple air head pump is identified with a last digit 3 Thus a 900 ratio pump with 3 air heads is described as a 903

Haskel air driven liquid pump* work on an automate reciprocating differential area principle (hat uses a large area air drive piston connected to a smaller area hydrau* lie piston/plunger to convert compressed air power into hydraulic power

The nominal ratio between ihe area ol the air drive piston and the hydraulic piston is indicated by the dash number in the model description and approximates the maximum pressure the pump ts capable ot generating Unlike other air driven pumps the actual ratio is approximately 15% higher thai the nominal so that the pump will stilt cycle when the ratio of the output hydraulic pressure to the air drive pressure equals the nominal ratio For example an AW-3S has an actual ratio of

401

Example

II air dnve piston area and liquid piston area then actual pump ratio and nominal pump ratio

= 25 9 sq ffl (167 sq cm = 0 65sq in (4.2 aq. cm) = 40.1 = 351

= 75 pai (5.2 bar)

if air dnve pressure

ÎSStq i» i *■ : . M 67 tq Cm i ÌM0

(he maximum outlet stall

pressure will be close (o 40 x 75 = 3000 psi (204 bar)

(dopendmg on friction)

SINGLE AIR HEAD PUMP

MWiiwraHKHMuuG

Ci65ki M ■ ■ • v. TOO M

TmEBEÉQRE actual RATO:40 i

if the air drive pressure is increased to 100 psi (7 bar) then minimum outlet pressure may be close to 4000 psi {272 bar) at stall

When compressed air is first applied lo the pump it will cycle ai its maximum speed producing maximum (low and act as a transfer pump filling Ihe pressure receiver with liquid The pump will then gradually start to cycle at a slower rate as the pressure in the receiver increases and offers more resistance to the reciprocating differential piston assembly, until rf stops (stalls) when a balance ol forces is reached i e when air dnve pressure x air dnve piston area - stall pressure x dnven hydraulic piston area

The hydraulic pressure drop (hysteresis) required lo cause the Haskel air driven pump to restart is extremely small due to Ihe very low frictional resistance ottered by the large diameter air drive piston seal and hydraulic seal Under ideal conditions (lubricity, etc.) (his can be as low as two PSI times the pump's ratio.

l(m»9tq in |40ûwoni

Aim 2S 2 SQ « 1390 to cmi

DOUBLE AIR HEAD PUMP

Aim ISu " 00m en)

ACTUAL RATIO* " MOMWAt RATIO it i

Output Horsepower ratings

Nominal horsepower ratings use 85 pei (5 5 bar) air drive pressure and are approximate They assume an ample air supply at adequate pressure at the pump Inadequate air drive pipe Ime sizes, dirty air filters, etc can effect Ihe performance of any pump Peak hp is obtained at approximately 75% of nominal ratio x air drive pressure

i e 100 1 pump being dnven at 100 psi (7 bar) will produce peak power at a hydraulic output pressure ot approximately 100 x 100 x 0 75 = 7500 psi (517 bar)

Ai«m 2S 9 so "i 1*00 to cm)

(3S0*q an)

Atw 25?« {390 GQ cm>

TRIPLE AIRHEAO PUMP

Aim SS h m (10 m OTif

THEREFORE ACTUAL RATiCfallB i 'KWINAL fUîtO'OT i

Liquid pumps - Haskel International - #4

Pump, Air compressor, High pressure valve, Stationary compressor, Diaphragm compressor