The pump mechanism functions under flooded lubrication within a large sealed reservoir for wear-free operation. Durability is increased through the use of high quality materials in the drive train. The worm is of hardened and polished steel, and the worm gear is made from DYNALLOY® bronze, typical of high quality speed reducers.

The life of the pump is also extended by the use of tapered roller bearings.

Each major component of the drive and stroke length mechanism is available for quick inspection or service without major disassembly of other parts.

PULSA® Series pumps are well known for their rugged construction and years of dependable performance. All internal parts are manufactured to the highest standards. Years of refinement have produced a design that's not only reliable and efficient, but exceptionally easy to service. The PULSA® Series Models 7120, 7440, 7660, and 8480 all use the type of drive mechanism shown below - a FULL MOTION drive mechanism.

The unique sealed cover with diaphragm breather allows the reciprocating mechanism to breathe without introducing outside air and environmental contaminants into the hydraulic and lubrication reservoir.

Stroke length of the plunger is controlled by micrometer positioning of a screw to limit movement of the plunger as it follows the driver cam. The PULSA® 340 uses a one-piece plunger crosshead for ultimate simplicity and economy.

PULSA® 880 metering pumps produce flows approaching 100 USGPH. A unique hydraulic dampener built into the plunger softens the engagement of the drive to the plunger... an innovative feature not found in competitive models.

Mechanical Lost Motion Style
Four smaller pumps in the PULSA® Series, the 200, 340, 680, and 880, use a simple mechanical lost motion style stroke length adjustment. This arrangement offers exceptional economy and serviceability.

The integral o-ring design of the diaphragm permits tightening the reagent head bolts to maximum bolt torque without stressing the diaphragm material. Other manufacturers offer daphragm designs requiring flat gaskets to prevent leakage past the outer edge of a plastic diaphragm. This design relies on compression to ensure leak-free operation. If the reagent head bolts are over-tightened, the diaphragm may become compressed at the outer edge and be unusable.

Flat diaphragms are also available in a variety of metal alloys and other plastics. The metal diaphragms are recommended for extreme temperature conditions (up to 371°C / 700°F) or for handling radioactive or gaseous materials.