APEX PUMPS LIMITED

• POSITIVE DISPLACEMENT PUMPS 03 to 450 LPM
• AIR COOLED OIL COOLERS FOR HYDRAULIC OIL
• FORCED LUBRICATION SYSTEMS With OIL COOLER FOR GEAR BOX LUBRICATING OIL
• PETROLEUM METERING UNITS
• INDUSTRIAL GEAR BOXES

SHUTTLE BLOCK PUMPS

                   
Shuttle Block Pumps Overview

The mechanical principle of the APEX SHUTTLE BLOCK  Pump incorporates the pump casing, the rotor, the piston, and the shuttle. The rotor is a liquid-tight fit within the casing, with the piston and shuttle being equally liquid-tight in their fit to each other and to the rotor. In operation the piston slides back and forth in the rotor slot and discharging from the opposite end. At the same time the shuttle slides back and forth within the piston slot (picture),

drawing liquid through one rotor port and discharging through the other. The rotor, which functions as a rotating valve, channels the liquid from the intake port around through the casing and out the discharge port. This action, while rotary, actually accomplishes the same type of pumping principle as a direct-acting piston pump. There are, therefore, two direct-acting pistons pumping through two cylinders, being valved by the rotary action of the rotor.

The reciprocating piston action is accomplished by the center bearing of the shuttle which rotates on a shuttle pin eccentric to the rotor shaft. Since the rotor is concentric with the shaft and the shuttle bearing is eccentric to the shaft, a reciprocating action of the piston and shuttle within their respective cylinder slots is created by revolving the rotor. Four overlapping strokes of the piston and shuttle for each revolution of the rotor create a smooth discharge with pulsation reduced to a minimum. An extremely high volumetric efficiency is obtained because of the piston-type action and the liquid-tight fit of the moving members.

• Unique Tri-Rotor positive displacement, rotary piston pump principle.

• Simplicity ... only three moving parts.

• Practically noiseless operation.

• Extra-long bronze shaft bearing.

• Oversize packing gland.

• Minimum maintenance demonstrated in the field.

• Will not chew, aerate, or foam the material pumped.

• High volumetric efficiency on thin and viscous liquids.

• Continuous discharge pressure and steady flow rate.

• Exceptionally long service life.

Highly viscous materials are easily handled with exceptionally high volumetric efficiency while thin, volatile materials are handled with little loss in slippage through the pumping members. Materials critical to agitation are handled with little or no mechanical beating, since the product is carried through the pump by piston action without being subjected to the combination centrifugal and gear or paddle agitation.

Capacity 100 to 450L.P.M.

Because of their unique design, Tri-Rotor Pumps excel in pumping many difficult-to-handle products, as well as the common materials found in many industrial applications. Here are only a few of the varied materials handled by Tri-Rotor Pumps with outstanding success:

Bitumen, Caustic Soda, Chocolate, Corn Syrup,

Coal Tar Pitch, Crude Oil, Enamel, Edible Oils,

 Fatty Acid, Fuel Oil (LDO, LSHS, HHS, RF, O),

Glue-hot, Grease, Kerosene, Lacquer, Lard-hot,

Linseed Oil, Lubricating Oil, Molasses, Naphtha,

Palm Oil, Paint, Petroleum, Printing Ink, Resin,

Shellac, Soap Liquor, Sodium Silicate, Starch,

Sugar Syrup, Tar, Turpentine, Varnish, Wax, etc.

APEX PUMPS LIMITED

G-228,RIICO industrial area, Sitapura,

jaipur-302022.

MOBILE-9810461516,TELEFAX-91-11-25762011

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External Gear Pump Overview

External gear pumps are a popular pumping principle and are often used as lubrication pumps in machine tools, in fluid power transfer units, and as oil pumps in engines.

External gear pumps can come in single or double (two sets of gears) pump configurations with spur (shown), helical, and herringbone gears.  Helical and herringbone gears typically offer a smoother flow than spur gears, although all gear types are relatively smooth.  Large-capacity external gear pumps typically use helical or herringbone gears. Small external gear pumps usually operate at 1000 or 1500 rpm and larger models operate at speeds up to 640 rpm. External gear pumps have close tolerances and shaft support on both sides of the gears.  This allows them to run to pressures beyond  20 BAR.  With four bearings in the liquid and tight tolerances, they are not well suited to handling abrasive or extreme high temperature applications.

Tighter internal clearances provide for a more reliable measure of liquid passing through a pump and for greater flow control. Because of this, external gear pumps are popular for precise transfer and metering applications involving polymers, fuels, and chemical additives.

How External Gear Pumps Work

External gear pumps are similar in pumping action to internal gear pumps in that two gears come into and out of mesh to produce flow.  However, the external gear pump uses two identical gears rotating against each other -- one gear is driven by a motor and it in turn drives the other gear.  Each gear is supported by a shaft with bearings on both sides of the gear.

1.  As the gears come out of mesh, they create expanding volume on the inlet side of the pump. Liquid flows into the cavity and is trapped by the gear teeth as they rotate.

2.  Liquid travels around the interior of the casing in the pockets between the teeth and the casing -- it does not pass between the gears. 

3.  Finally, the meshing of the gears forces liquid through the outlet port under pressure.

Because the gears are supported on both sides, external gear pumps are quiet-running and are routinely used for high-pressure applications such as hydraulic applications. With no overhung bearing loads, the rotor shaft can't deflect and cause premature wear.

Applications

Common external gear pump applications include, but are not limited to:

• Various fuel oils and lube oils
• Chemical additive and polymer
• Chemical mixing and blending (double pump)
• Acids and caustic (stainless steel or composite construction)
• Low volume transfer or application

 Materials Of Construction / Configuration Options

As the following list indicates, rotary pumps can be constructed in a wide variety of materials. By precisely matching the materials of construction with the liquid, superior life cycle performance will result.

External gear pumps in particular can be engineered to handle even the most aggressive corrosive liquids.  While external gear pumps are commonly found in cast iron, newer materials are allowing these pumps to handle liquids such as sulfuric acid, sodium hypochlorite, ferric chloride, sodium hydroxide, and hundreds of other corrosive liquids.

• Externals (head, casing, bracket) - Iron, ductile iron, steel, stainless steel, high alloys.
• Internals (shafts) - Steel, stainless steel, high alloys,
• Internals (gears) - Steel, stainless steel, PTFE, composite (PPS)
• Bushing - Carbon, bronze, silicon carbide, needle bearings
• Shaft Seal - Packing, lip seal, component mechanical seal. 

APEX PUMPS LIMITED

G-228,RIICO industrial area, Sitapura, jaipur-302022.

MOBILE-9810461516,TELEFAX-91-11-25762011