AccuStaltic pumps are positive displacement pumps that use valve-less squeezing actions on resilient tubing to move liquid. This type of pump is called a "peristaltic" pump. There are many advantages to peristaltic pumps, and when combined with the multi-channel design, rugged construction, various drive options, and unique manifolds, AccuStaltic pumps perform when no other pump can.

Watch this video to see an example of the AccuStaltic pump in a dosing application.

AccuStaltic Peristaltic Pump Technology Diagram

True positive displacement - fixed distance occlusion:

AccuStaltic pumps are a true positive displacement pump. The pump rotor and rollers are held by precision sealed bearings at a fixed distance from the pump housing to create a complete occlusion (pinching seal) at all times during the pumping cycle. Some other designs use less precise spring loaded rollers which limit the pinching force and allow them to use lighter weight pump housings.

Consistent flow, accurate metering on all channels:

Due to the complete occlusion, all positive displacement AccuStaltic pumps deliver a consistent flow on all channels, regardless of variations in individual channel back pressure. This is very important when metering fluids to multiple points with different lengths of feed hose. It is also important when the viscosity of the fluid may change during operation and a constant dose or ratio between 2 channels must be maintained.  

No seals or check valves:

The complete lack of rotating seals and check valves make peristaltic pumps not only ideal for aggressive, abrasive or sterile fluids, but also ideal for simple maintenance. Fluids that crystallize also benefit from peristaltic pumps because there are no valves or glands where crystals can build up.

Fluid contained in tube:

The pumping action is applied to the outside of a tube, which is unlike most other pumps, where some parts of the pump come into direct contact with the liquid. Peristaltic pumps are used to pump clean or sterile fluids because the pump cannot contaminate the fluid. Peristaltic pumps are also used to pump aggressive fluids because the fluid cannot contaminate the pump.

No cavitation, suction side control:

Peristaltic pumps produce suction from the rebound of the resilient tube.  Should the inlet become partly or completely blocked, no cavitation will occur and the tube simply will not inflate. This causes no problem with the pump, and as long as some fluid is flowing for internal lubrication, a partial blockage can be used for a suction side flow regulation. 

Handles highly viscous fluid:

The ability to control the pump speed, and the high suction capabilities of the pump at low speeds, makes them perfect for highly viscous fluids. The only requirement is that the flow rate of the fluid is sufficient for the fluid to refill the tube. The speed of the pump can be adjusted to achieve this condition and therefore pump fluid of almost any viscosity.

Unaffected by abrasive or corrosive fluids:

Because the tubing is the only part of the pump that ever comes in contact with the fluid, AccuStaltic pumps can handle extremely corrosive and abrasive fluids by selecting a compatible tubing type. There are no check valves, impellers, or pump housing to be eroded by an abrasive, nor are there any seals to be attacked by a corrosive. Additionally, since all fluid is contained in the tube, routine maintenance can be performed without exposing the personnel to the fluid being pumped.

Rigid design for strength and heat dispersion:

A very rigid construction is required for the complete occlusion of AccuStaltic pumps. This is achieved by using heavy duty aluminum extrusions and high strength stainless steel rollers with sealed needle bearings. One advantage to this type of construction is that aluminum is a very good heat conductor, when compared to plastic, and easily dissipates heat generated at the point of contact between the housing and tube. A second advantage of this very structural construction is that, while designed for strength on the inside, it inherently gives the pump outstanding durability against incidental damage from the outside. Many AccuStaltic pumps are mounted on mobile agricultural equipment where the crews are somewhat less than delicate.

High vacuum, self-priming:

AccuStaltic pumps create suction from the expansion of the resilient tubing and can reliably achieve vacuum as high as 710 mm Hg (28" Hg). They do not require a wetted surface to create a vacuum, allowing them to be entirely self-priming and start from a completely dry condition.

Easy maintenance:

AccuStaltic pumps are easy to maintain, even when used with the most challenging fluids. The cover is designed for quick hand-operated access. It can be opened for inspection or tube replacement anytime the pump is not operating. One single cover accesses all channels simultaneously, eliminating time consuming disassembly of stacked-up pump heads.  

Quick change of tubes and fluid:

The working fluid of an AccuStaltic pump can be quickly changed, with no cross-contamination, by simply removing the complete tube manifold set and inserting another set. A manifold can be exchanged by removing a few simple bolts, allowing installation of another pre loaded manifold for a fast line change.  The set that has been removed can be cleaned offline, permitting the absolute minimal down time for the pump and process line. This procedure is often used in paper mills and other operations where dyes or pigments are used and traditionally have a time-consuming cleaning procedure.

Precise control of flow rate:

Unlike many pumps, peristaltic pumps can be operated at very low speeds. In fact, since the pumps are self-priming and entirely prevent back flow, they can start and stop anytime and still maintain accurate flows. AccuStaltic pumps driven with inverter duty motors and controlled by a variable frequency drive can produce precise flows, adjustable over the entire operating range.

Withstands harsh external environments:

The pumping mechanism is manufactured with the harshest environments in mind. The pump housing is coated with Nituff®, a surface treatment which penetrates PTFE (Teflon®) into a hard anodized coating for a self-curing, self-lubricating surface with low friction, high corrosion resistance, and dielectric properties superior to the ordinary hard anodize. Additionally, the rollers and shafts are stainless steel, and the main bearings and roller bearings are sealed. We offer both hydraulic drive and full wash down electric drive systems to accommodate harsh conditions outside the pump.

Low pulse operation with balanced manifolds:

Common, positive displacement pumps such as piston, diaphragm and even peristaltic pumps, create flow pulses due to the cyclic nature of the pump. AccuStaltic divided rotor pumps, with a pulse-balanced manifold, combine the flows of two channels to achieve a virtually pulse-free flow.

Prevents back flow, eliminates check valves:

The basic design of the AccuStaltic pump ensures that there is always one occlusion between the suction side and the output side of the pump. This eliminates the need for check valves and other back flow prevention, and when the pump is unpowered, no shut-off valve is required to prevent flow through the pump.

Shear sensitive fluids will not be degraded:

The fluid path in AccuStaltic pumps is very smooth and the fluid is pumped by a gentle squeezing action. There are no check valves, impellers, or piston edges to damage the fluid, which is why peristaltic pumps are used for handling blood. While only very specialized pumps are used for blood, the same principles used for pumping that precious fluid are available for industrial purposes with the rugged AccuStaltic pump.

Synchronized flow ratios for multi-part mixtures:

The multi-channel design of AccuStaltic pumps provides perfect synchronization of two or more flows for specific ratio mixing, such as found in epoxies or many other multi-part mixtures. The exact ratio can be set by the tubing sizes and number of channels, since different size tubes can be used in the same pump. Because they are driven by the same rotor, the exact ratios needed will always be maintained.

No vapor lock caused by gaseous fluids:

AccuStaltic pumps do not suffer from vapor lock as many pumps can, especially when pumping two-phase (gas and liquid) fluids. With sodium hypochlorite, for example, it  is a well known problem in waste treatment facilities. AccuStaltic pumps do not have any problem pumping liquid and gaseous fluids in the same tube.

Fully integrated manifold systems:

While some peristaltic pumps allow stacking multiple pump heads on the same motor, AccuStaltic are the only pumps with a fully integrated manifold system for combining, dividing, or pulse-balancing the flows. Having the choice of these integrated manifolds or all discrete channels make AccuStaltic not only the most versatile, but the simplest to install peristaltic pump on the market.

Electric, VFD, Hydraulic and clutch drive options:

To accommodate the many different uses of AccuStaltic multi-channel pumps, we offer several different drive options including variable speed, fixed gear ratio electric, and hydraulic. A clutch drive system is also available for cyclic dosing processes.