Food

Dairy Pipe Lines (DPL) has gained an enviable reputation during the past 50 years for manufacturing hygienic valves, fittings and pipework for the food processing sector. We not only provide customers with quality, reliable products, but also offer expert advice to help you achieve high performance integrated process solutions.

We appreciate that poor hygienic design of food process equipment and inferior build quality can affect the quality and microbiological safety of your product. All surfaces in contact with the food must be cleanable, since equipment which is difficult to clean will require more aggressive chemicals and longer cleaning cycles, resulting in higher costs, lost production time and increased effluent.

Hygienic and aseptic conditions are achieved by a variety of procedures ranging from manual strip down and cleaning of component parts to Clean In Place (CIP). For a CIP system to clean effectively the fluids must be at the correct temperature, velocity and pressure to ensure product debris is dislodged.

DPL’s hygienic Diamond valve design meets mechanical, process and microbiological requirements. Materials used in the construction of food processing equipment must be inert to both the product and cleaning chemicals whilst also being corrosion resistant and nontoxic, which is why DPL manufactures from AISI-304, 316 and 316L stainless steel. In addition, the elastomers utilized in all our valves and fittings are food grade and, where possible, the compression is controlled to prevent damage to the rubber or extrusion into the product zone, which would otherwise adversely affect cleanability.

Operational reliability and the trouble free service provided by our process equipment results from the correct selection of high quality specialized lubricants. To fulfill international food processing safety requirements we use USDA authorized ‘food grade’ lubricants. The use of unspecified lubricants can seriously affect valve performance due to possible elastomer distortion and swelling and this is particularly important in the case of EPDM elastomer types as these are extremely sensitive to contact with unsuitable lubricants.

Surface roughness can also have a significant influence on cleanability. In general, the greater the surface roughness, the longer the cleaning time required. Therefore we ensure that all surfaces in contact with food have a maximum surface roughness value of Ra < 1.0 µm, while exterior surfaces have a surface roughness value of Ra < 1.6 µm.

The exterior and interior of all food contact equipment must be self-draining and easily cleanable, with the geometry of design, especially valve design, ensuring that liquid exchange in all areas is in contact with product. DPL’s Diamond valves therefore ensure that no gas pockets remain in the valve when liquid flows through and that it is possible to drain the valve completely in at least one installation position without the need for dismantling. Furthermore, our designs also ensure there are no threads, pits, crevices or sharp edges in contact with the product.

It is important that the correct valve and fittings are specified for any given food application and the DPL team can assist in equipment selection by supplying technical data and offering advice on valves and fitting types. In addition to complying with the pressure and temperature ratings, valves and fittings must be suitable for use with the product type, the cleaning methods and cleaning media as well as comply with site standards.

Full in house design and manufacturing facilities combined with DPL’s experience in the production of food handling equipment enable us to produce bespoke fabrications such as valve manifolds and flow-plates. These fabrications are assembled under controlled factory conditions and can be supplied fully tested to exact customer specification - self-draining, without dead legs and with all internal welds removed.

Numerous Blue Chip companies rely on DPL’s project management capabilities in the development of integrated process control systems. Working in partnership with you, we can advise on everything from simple product assembly to complex turnkey plants requiring market research, feasibility studies, plant layout design, technical proposals, product supply, installation and on-site inspection.

Our expertise in the food processing sector also extends to drawing up specifications to customer requirements and all this is backed by DPL’s enviable after sales service, which includes technical advice and maintenance support, to keep your product line performing.