Norms for solenoid valves and components

General considerations

 

• DIN VDE 0580:2000
• DIN VDE 0110

 

IP protection

• DIN EN 60529 bzw. IEC 529

Electrical interfaces

 

• DIN EN 175301-803
• DIN 72585-1
• IEC 61076-2-101

 

Pneumatic interfaces

 

• ISO 15218 (Mounting Interface surface)

 

Flow rates

 

• ISO 6358 (Determination of flow-rate characteristics)
• CETOP RP 50 P

 

Switching times

 

• ISO 12238

 

Compressed air

 

• ISO 8573-1 (Compressed air quality classes)

 

Varnished wires

 

• DIN EN 60317

 

Explosion protection/Europe

 

• 94/9/EG (ATEX95)
• EN 50014
• EN 60079-18
• EN 50281-1-1
• EN 50021

 

 

Construction of the solenoid coil

The solenoid coil consists of a heat-proof plastic coil body in which the winding is comprised of insulated varnished copper wire. The solenoid coil, iron core, and live and earth tongues are fully-encased in plastic up to the connector terminals. By this means, the necessary protection against accidental contact following the attachment of an appropriate connector is guaranteed in compliance with the VDE. Increased IP protection may be achieved by the use of suitable seals (O-rings).

Construction of the armature systems

The armature and solenoid core are made of a high-grade chrome-nickel steel specially intended for magnetic purposes which is virtually rust and acid resistant. The armature glides in a brass armature guide. The combination of these two materials guarantees a very long service life. The seal inserts in the armature are made of FPM, a heat-, acid- and wear-resistant material. Other materials may be used according to customer requirements in the case of special designs.

Attachment

The solenoid coil is attached to the armature system by means of a knurled nut or a vent protector. This method of attachment prevents overloading of the anchor guide material due to the application of excessive torque when tightening the attachment nut. The attachment nut is secured by the flexibility of the plastic material (polyamide) of the nut as well as by protrusions on the solenoid that engage with recesses in the nut. The armature system can be attached on the lower part of the valve using either screws (flange design) or an integrated thread. For applications under extreme dampness conditions, O-rings may be additionally supplied which provide a reliable seal against moisture in combination with the knurled nuts.

Standard designs

Solenoid coils may be supplied with diverse connector variants. These are encased in Duroplast or Thermoplast. The direct current designs may be operated using a direct voltage source with a ripple of 5 to 45 % or by a battery. The alternating current designs are suitable for a 50Hz or 60Hz supply. Other variants may be combined using the modular construction system. In the case of 2/2-way functions, larger pressures and nominal diameters of up to 3.0 mm may be controlled.

nass magnet logistics: packaging

The products manufactured by nass magnet GmbH are subject to high quality standards. Accordingly, equally high demands are placed on the type and choice of packaging. Armature and valve systems, solenoid coils and solenoid valves are transported by means of a reusable plastic packaging system, taking account of the size, shape and weight of the item concerned. This system consists of high-grade and extremely stable packaging units that are integrated in a fully-automatic production process for the products to be manufactured. The advantages of this system are

1. to guarantee safe and clean in-plant transportation,
2. to dispense with the task of repackaging, thereby reducing costs and avoiding mix-ups that can occur in manual work,
3. to ensure the lowest risk of damage during transportation to the customer
4. to offer customers the possibility of automatic goods removal
5. to safeguard the environment and thereby reduce waste disposal costs.

Following cost-free return by mail, the reusable packaging will be accepted for further use. These will be checked for reusability according to the following criteria:

• improper use
• obvious signs of wear and tear
• dirt that is difficult to remove
• untenable damage and deformations

A credit note is then allocated to packaging that may be reused. The slight difference between the cost price and the credit entry covers administration and handling costs as well as the replacement of reusable packaging that must be discarded due to general wear and tear.
Disposable packaging, such as cartons and foils, are only used for repacking dispatched items or according to special customer requirements. In such cases, it should be noted that the additional work tasks such as e.g. the repacking of products from reusable packaging to disposable packaging will possibly result in an additional charge. The use of filling material solely serves to protect goods within the packaging units.

The nass magnet logistics team will be glad to provide you with further information regarding our reusable plastic packaging system.

nass magnet logistics: transport

As in the choice of packaging,nass magnet attaches a great deal of importance to the safe and prompt transportation of goods ready for dispatch. For this reason, nass magnet operates in cooperation with specially selected, reliable and well-proven forwarding companies. As a rule, these are favoured by nass magnet GmbH customers.

Reasons:

• fair-price transportation tariffs
• an invoice including transportation costs
• dependable transportation times

According to the wishes of our customers, we are naturally ready to work hand in hand with their forwarding companies.

The nass magnet logistics team will be glad to provide you with further information regarding our forwarding system.

Expertise in plastics

nass magnet has many years of experience in the moulding of plastics and the construction of moulding machines. Injection weights ranging from 0.08 g up to 50 g per part cover the full spectrum of miniature and precision plastic components. In order to operate almost independently of the plastic parts supplier market, nass magnet produces the major part of its plastic parts requirements within the company. Duroplast or Thermoplast are thereby adopted as standards for the encasement of solenoid coils.

Materials: sealing materials (O-rings)

General ranges of application
The areas of application of elastomer materials cover a wide range. The different elastomers may be characterized as follows:

NBR (Nitrile Butadiene Rubber)
Good mechanical properties at operating temperatures of -30 °C to +100 °C. NBR is mainly used for mineral oil and grease seals.

FKM (Fluorine Rubber)
Characterized by high flame retardance, low gas permeability, very good ozone, weathering and ageing resistance. The operating temperature range of fluorine rubber lies between -20 °C and +200 °C (up to +230 °C for short periods). FKM is also frequently used for mineral oil and grease seals operating at high temperatures.

EPDM (Ethylene Propylene Diene Rubber)
EPDM exhibits good heat, ozone and ageing resistance. It also exhibits high elasticity, good low-temperature behaviour as well as good electrical insulation properties. The operating temperature range lies between -45 °C and +150 °C. EPDM is frequently used for brake fluid (based on glycol) and hot water seals.

HNBR (Hydrogenated Nitrile Butadiene Rubber)
HNBR exhibits good mechanical properties. Operating temperatures range between -30 °C and +140 °C (up to +160 °C for short periods) in contact with mineral oils and grease.

Q (Silicones, HTV)
Silicone rubbers are characterized by high thermal resistance, high flexibility at low temperatures, good dielectric properties, and above all, high resistance against oxygen and ozone. Depending on the design type, possible operating temperatures range from -60 °C to +200 °C (in some cases, also up to +230 °C for short periods). Special types may be deployed for operating temperatures down to -90 °C.

CR (Chloroprene Rubber)
In general, chloroprene vulcanisates exhibit high resistance against ozone, weathering, chemicals and ageing. In addition, high flame retardance, good mechanical properties and high flexibility at low temperatures. Operating temperatures range between -40 °C and +100 °C (up to +120 °C for short periods). Besides other applications, CR materials are used to manufacture seals against coolants, outdoor seals and seals used in the adhesives industry.

ACM (Polyacrylate Rubber)
Although ACM exhibits very good ozone, weathering and hot-air resistance, it possesses only medium strength, low elasticity and relatively poor low-temperature properties. Operating temperatures lie between -20 °C and +150 °C (up to +175 °C for short periods). Owing to their especially high resistance to high-additive lubricating oils (also containing sulphur) at high temperatures, ACM materials are mainly used in the automobile sector.

FFKM (Perfluor Rubber)
Perfluor elastomers are characterized by a universal resistance against chemicals similar to that of PTFE as well as high thermal resistance. They exhibit very low swelling values in practically all media. Depending on the mixture composition, the operating temperature range lies between -25 °C and +240 °C. FFKMs mainly find application in the chemical and processing industry, and are used in all applications involving aggresive media and high temperatures.

Material: frequently used metals

Brass:

• copper alloys
• CuZn39Pb3

Machining according to EN 12614

Steels:

• 1.4105 X6CrMoS17
• 1.4104 X14CrMoS17
• 1.4301 X5CrNi18-10
• 1.4305 X8CrNiS18-19
• ST35

Machining according to NN 1020 000 (burrs, surface, edges)

Lacquered copper wire:

• All winding wire in use ranges from 0.028 mm to 0.75 mm Ø.
• Special gauges also available on request.
• Quality of the wire and wire finish according to DIN EN 60317-23

 Materials: frequently used plastics

• PA6 Polyamide
• PA66 Polyamide
• POM Polyoxymethylene
• PPS Polyphenylene Sulphide Polycondensate thermoplasts
• PTFE Polyvinylidene Fluoride
• PBT Polybutylene Terephthalate
• ABS Acrylnitrile-Butadiene-Styrene
• EP Epoxy resin Duroplast

The materials mentioned are subject to data-specific storage and processing. Further details regarding thermal and mechanical properties may be found in the relevant technical literature.

The use of the individual materials depends on specific customer requirements matched to the prescribed data.

Facts worth knowing about nass magnet

• nass magnet develops pneumatic pilot control valves according to market demands.
• nass magnet also develops customer-specific pilot control valves according to customer requirements.
• nass magnet produces pilot control valves in Germany and Hungary at nass magnet Hungária Kft..
• nass magnet is an independent company.
• nass magnet exports its products around the globe.
• In the countries that import our products, nass magnet has a reputation for stability, good consultation, high product quality and fair product prices.
• nass magnet thinks ahead.
• Today, as in the future, nass magnet will prove its competence in the fields of automotive, medical and process technology.
• nass magnet is the solution!
• nass magnet is certified according to: DIN EN ISO 9001 : 2008.