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Liquid Pumps
Haskel International has nearly 60 years of hydraulic and pneumatic
engineering experience in the design and manufacture of air driven liquid
pumps. Continuous investment in new machinery and technology keeps Haskel
at the forefront of the field.
We offer the most complete range of models in the industry measured for:
- Capability of ultimate pressure, flow or output horsepower
- Compatibility with a variety of liquids
What is a Haskel Air Driven Liquid Pump?
 1.
Air Drive Section
This consists of a light weight inertia reducing piston complete with
o-ring seal inside an epoxy filled wound fiberglass or hard coated aluminum
barrel. The diameter of the air piston is constant for any series of air
driven pumps. When compressed air is fed into the air drive it forces
the piston down on the compression stroke. The air then drives the piston
back on the suction stroke (except in the case of the M series pumps which
have a spring return). Unlike many competitive pumps, air drive line lubricators
are not required nor desired due to the inherent low friction characteristics
of the Haskel design and lubrication during assembly.
 2.
Hydraulic Section
The hydraulic piston/plunger is directly linked to the air piston and
its lower portion is housed inside the hydraulic body. Its diameter determines
the ratio of the pump (for any particular series) which in turn determines
the output flow and maximum pressure capability. Its function is to induce
liquid into the hydraulic body through the inlet check valve and force
it out through the outlet check valve at a higher pressure.
These are spring loaded non-return valves that control the passage of
liquid into and out of the pump. When the hydraulic piston/plunger is
on the suction stroke the inlet check valve opens to the maximum, the
liquid is induced into the pump while the outlet check valve is held closed
by its spring. On the pressure stroke the inlet check valve is closed
as the hydraulic piston/plunger force the liquid out through the outlet
check valve.
A dynamic seal encircles the hydraulic piston/plunger, and is one of
the few wearing parts. Its function is to contain the liquid under pressure
during cycling and prevent external leakage or leakage into the air drive.
Different seal materials and configurations are used, based on the compatibility
of the liquid to be pumped, operating temperature and the pressure rating.
NOTE: With most Haskel pumps a distance piece can be incorporated, between
the air drive section and the hydraulic section, for complete separation
and contaminant free operation.
 3.
Air Cycling Valve
This consists of an unbalanced, pilot operated, light weight spool that
channels the compressed air to either side of the air piston, depending
on position. The air piston actuates pilot valves at the top and bottom
of its stroke, alternately pressurising and venting the large area of
the spool, causing it to reciprocate and control the air flow to the air
piston to maintain automatic cycling. The air is exhausted from the pump
through an exhaust muffler. Unlike many competitive pumps, Haskel does
not use close metal to metal fits in their design. This eliminates the
costly air leakage that would otherwise result in a spool hang up condition.
Key Features
Haskel air driven pumps offer many advantages over conventional electrical
driven units as follows:
- Ability to install at any predetermined pressure and hold this fixed
pressure without consuming power or generating heat.
- No heat, flame or spark risk.
- Infinitely variable cycling speed output.
- Up to 100,000 psi (7,000 bar) pressure capability.
- Easy to apply automatic controls.
- No limit or adverse effect to continuous stop/start applications.
- Air drive does not require an external line lubricator thus saving
on running cost and preventing oil vapour contamination of the surrounding
environment.
- Reliable, easy to maintain, compact and robust.
- Wide range of modifications and control options.
- Noise reduction kits for selected models.
- Unbalanced cycling spool provides immediate operation in response
to output pressure change.
- Suitable for large variety of liquids and liquefied gases.
- Bottled gas, boil off from a liquefied tank or natural gas can be
used as an alternative to air drive.
- Range of standard systems or systems designed and manufactured to
customer specifications.
Haskel products are backed by an international network of highly trained
distributors with application engineering expertise who can provide a
complete problem solving service.
Operating Guidelines
Download Operating & Maintenance Instructions:
 Haskel
air driven liquid pumps work on an automatic reciprocating differential
area principle that uses a large area air drive piston connected to a
smaller area hydraulic piston/plunger to convert compressed air power
into hydraulic power.
The nominal ratio between the area of 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 is capable of generating. Unlike other air
driven pumps the actual ratio is approximately 15% higher that the nominal
so that the pump will still cycle when the ratio of the output hydraulic
pressure to the air drive pressure equals the nominal ratio. For example
an AW-35 has an actual ratio of 40:1.
Example:
If air drive piston area = 25.9 sq. in. (167 sq. am)
and liquid piston area = 0.65 sq. in. (4.2 sq. cm)
then actual pump ratio = 40:1
and nominal pump ratio = 35:1
If air drive pressure = 75 psi (5.2 bar)
then the maximum outlet stall pressure will be close to 40 x 75 = 3000
psi (204 bar)
(depending on friction)
 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 to the pump it will cycle at its
maximum speed producing maximum flow and act as a transfer pump filling
the 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 it stops (stalls) when a balance of forces is reached. i.e. when
air drive pressure x air drive piston area = stall pressure x driven hydraulic
piston area.
The hydraulic pressure drop (hysteresis) required to cause the Haskel
air driven pump to restart is extremely small due to the very low frictional
resistance offered by the large diameter air drive piston seal and hydraulic
seal. Under ideal conditions (lubricity, etc.) this can be as low as two
PSI times the pump's ratio.
Output Horsepower ratings
Nominal horsepower ratings use 85 psi (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 line sizes, dirty air filters,
etc. can effect the performance of any pump. Peak hp is obtained at approximately
75% of nominal ratio x air drive pressure.
i.e. 100:1 pump being driven at 100 psi (7 bar) will produce peak power
at a hydraulic output pressure of approximately 100 x 100 x 0.75 = 7500
psi (517 bar).
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 of each other
to double or triple the intensification ratio without changing the hydraulic
piston. The double or triple air head pumps consume less air than competitors
pumps with a single air piston of equivalent area since only one of the
two or three heads is pressurised on the return stroke.
Single Air Head Pump |
Double Air Head Pump |
Triple Air Head Pump |
 |
 |
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The addition of a second and third air head increased the pump hp from
approximately 1.5 to 2 hp (1.12 kw).
Double air head pumps are identified by the last digit (2) in the pump
model number. Thus, a nominal 50:1 ratio pump with two air heads is described
as a 52. Similarly, a triple air head pump is identified by the last digit
(3). Thus, a 900 ratio pump with 3 air heads is described as a 903.
Selecting a Haskel Air Driven Liquid Pump
All Haskel pumps are identified by letters coding the type of pump, followed
by a number indicating the practical working ratio of the air drive area
to the hydraulic plunger area. These letters are explained in the pump
model and seal coding chart below.
Pump Model Letter Coding
| M |
1 " stroke 1/3 hp miniature pump series.
|
XH |
2" stroke 1.5 + 2 hp Extreme High Pressure
Pump series. |
| S |
Stainless steel hydraulic piston and body.
|
G |
4-1/2" stroke 6 hp Pump series. |
| MCPV |
1/3 hp Chemical Pump. |
8" |
4-1/2" stroke 8 hp Pump series. |
| D (Prefix) |
Pump incorporates a Distance Piece. |
14" |
4" stroke 10 hp Pump series. |
| D (Suffix) |
Double Acting Pump. |
W |
Polyurethane U-cup dynamic seal. |
| 4B |
1 " stroke 3/4 hp Pump series (bottom
inlet only). |
F |
UHMWPE (Ultra-high molecular weight polyethylene
dynamic seal). |
| A |
2" stroke 1.5 + 2 hp Pump series. |
T |
Reinforced Teflon dynamic seal. |
| H |
2" stroke 1.5 + 2 hp High Pressure Pump
series. |
V |
Viton O-Ring static seal. |
| |
|
-B |
Bottom inlet. |
One of the more important features of the Haskel pump is the seal assembly
for the hydraulic piston. Haskel's expertise in this field is considerable.
Longer life and more versatile seals are continually being developed by
Haskel to meet demanding applications.
Liquids compatible with Haskel Pumps
To assist in easier pump selection, we have allocated below a service
code number against certain popular liquids, classified in groups.
Service Code
| [1] |
Petroleum base oils, Kerosene, Diesel fuel,
Water with 5% soluble oil. |
| [2] |
Plain water. |
| [3] |
Most Phosphate Ester base fire resistant
hydraulic fluids: e.g., Pydraul, Lindol, Cellulube, Fyrquel, and Houghtosafe
1120 and Petroleum base solvents compatible with UHMWPE (Ultrahigh
Molecular Weight Polyethylene) dynamic, and Viton static seals. |
| [4] |
Petroleum base solvents, e.g., Boron fuels,
Aromatic hydrocarbons (Benzene, Toluene, Xylene, Hylene,etc.); Chlorinated
solvents (Trichloroethylene, Carbon Tetrachloride, Chlorobenzene,
etc.); Mecaptans, Dowtherm A, Fluoronated solvents (Fluorobenzene,
Fluorochloroethylene, etc.); Dowtherm E, plus all of group 3 plus
some mildly corrosive acids compatible with wetted materials. See
note [5A] for service with Methyl-Ethyl-Ketone, Methyl Acetone, Diaoetone,
Alcohol and Freon 22. |
| [5] |
Skydrol and Aerosafe hydraulic fluid. Acetone
and some alcohols (Ethyl, Methyl and lsopropyl). Also suitable for
these fluids if viton static seals replaced with EPR, specify modification
number 51331 (no extra charge), e.g, 51331 -MDTV-5. (Most Phosphate
Ester base fluids solidify at approximately 30,000 psi.) |
| [6] |
Deionized water. |
NOTE: Dynamic seal life with non-lubricating fluids will understandably
be less than with lubricating types.
Operating Temperatures
- Air Drive Section
+25 degrees thru +150 degrees F (low temperature seals are available.
Please consult your Haskel Asia representative).
- Liquid Section
For reasonable seal life, high temperatures should be limited to 125-130
degrees F for the "F" or "W" seal models; 275 degrees
F for the "T" or "TV" seal models (with distance
piece).
- Factory Assistance
Circuit assistance is available. Please contact your Haskel
Asia representative for further information.
Model Ranges
Click on the links below to view detailed information on each model.
Products
Typical Applications
- Pressing / Clamping
- Work piece fixtures
- Jacking
- Crimping Tools (Bolt tensioners torque wrenches, cutters, etc.)
- Research
- Petroleum extraction
- Liquid chromatography
- Magma simulation
- Corrosives
- Cylinder Positioning
- Valve actuators
- Nip controls
- Doctor blades
- Friction controls
- Precision Lubrication
- Compressors
- Textiles
- Bearings
- Forming
- Pressure Testing
- Gauges, valves, tubing, fittings, etc.
- Burst
- Cycle (Full A P)
- Linear ramp
- Proof
- Processing
- Super critical fluid extraction
- Food preservation
- Deionized water
- Homogenizing/Emulsifying
- Chemical Metering/Injection
- Gas pipeline
- Paper pulp viscosity control
- Treatment
- Foam production
- Controlled Rate of Pressurisation
- Cold isostatic pressing
- Material compression
- Forming
- Stretch test rigs
- Machine Tool Industry
Request Catalogue
 or
download catalogue (PDF
19.52mb)
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