Some of us will be thinking of going into the food manufacturing business and in view of this will need to be familiar with some of the industry terms and equipment used. In all likelihood, you may have come across the term positive displacement sanitary pump. This article will introduce you to what this piece of equipment is all about and why it is essential or used in some food manufacturing processes.
Basically a pump is used to move solutions, food products, and slurries that will be processed according to set standards of cleanliness and hygiene. These standards are either set by the private corporation or even by law. In the continental United States, the Food and Drug Administration with the US Department of Agriculture set these same standards.
Food processing sanitary pumps come in two types. One is a centrifugal type pump, which uses centrifugal force to pump fluids or mush right along, and the other is a positive displacement pump. The latter makes uses suction via rotating lobes in different fixed chambers. Either way, both are designed to prevent bacterial growth in the process.
PD pumps, the acronym for positive displacement types of mechanisms, produce much higher flow pressures than centrifuge mechanisms, although the latter gives much higher flow volume. Thus the PD pump is much sought after for specialist applications which involve thick liquids or liquids with fragile solids.
These pumps rely on pressure to move liquids through to a discharge system. The pressure is slowly built up by rotating lobes or parts pushing liquid into an enclosed and vacuum sealed chamber. The release velocity of this liquid is much slower than a centrifugal setup and thus ideal for liquids that have some form of fragile solids mixed in.
As such there are two types of PD pumps. One is the rotary type which uses rotating parts only to move liquids. This is most useful for liquids that have some solids in them. The other type of PD pump is the reciprocating pump, which also makes use of vacuum pressure for applications that require the elimination of reverse flow. Reverse flow is of major concern especially when filtration and such are required.
The sole advantage of the PD type of mechanism is that it can provide a constant flow of liquid within the range of medium to high pressure applications. This is particularly important in breweries and dairy production facilities which deal a lot with viscous liquids. Other viscous fluid applications best serviced by PD type mechanisms are found in firms that produces vegetable oils, molasses and such.
In sum it is hoped that this article has illumined a better understanding of what a PD pump is to the reader, and has lifted the shroud of mystery surrounding it somewhat. It is not an exhaustive piece as it would want to be, but hopefully this article has done its job of simplifying what may seem to be a very technical subject or topic.
Basically a pump is used to move solutions, food products, and slurries that will be processed according to set standards of cleanliness and hygiene. These standards are either set by the private corporation or even by law. In the continental United States, the Food and Drug Administration with the US Department of Agriculture set these same standards.
Food processing sanitary pumps come in two types. One is a centrifugal type pump, which uses centrifugal force to pump fluids or mush right along, and the other is a positive displacement pump. The latter makes uses suction via rotating lobes in different fixed chambers. Either way, both are designed to prevent bacterial growth in the process.
PD pumps, the acronym for positive displacement types of mechanisms, produce much higher flow pressures than centrifuge mechanisms, although the latter gives much higher flow volume. Thus the PD pump is much sought after for specialist applications which involve thick liquids or liquids with fragile solids.
These pumps rely on pressure to move liquids through to a discharge system. The pressure is slowly built up by rotating lobes or parts pushing liquid into an enclosed and vacuum sealed chamber. The release velocity of this liquid is much slower than a centrifugal setup and thus ideal for liquids that have some form of fragile solids mixed in.
As such there are two types of PD pumps. One is the rotary type which uses rotating parts only to move liquids. This is most useful for liquids that have some solids in them. The other type of PD pump is the reciprocating pump, which also makes use of vacuum pressure for applications that require the elimination of reverse flow. Reverse flow is of major concern especially when filtration and such are required.
The sole advantage of the PD type of mechanism is that it can provide a constant flow of liquid within the range of medium to high pressure applications. This is particularly important in breweries and dairy production facilities which deal a lot with viscous liquids. Other viscous fluid applications best serviced by PD type mechanisms are found in firms that produces vegetable oils, molasses and such.
In sum it is hoped that this article has illumined a better understanding of what a PD pump is to the reader, and has lifted the shroud of mystery surrounding it somewhat. It is not an exhaustive piece as it would want to be, but hopefully this article has done its job of simplifying what may seem to be a very technical subject or topic.
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