CE marking of hydraulic valves

Author: CEmarking TEAM | Last edited: 14.06.2020

Hydraulic valves used in control systems for machines and plants are neither incomplete nor individually usable machines. The Machinery Directive therefore does not stipulate CE marking for hydraulic valves. In general, the markings according to other European directives are also not applicable. However, depending on the design and intended use of the valve, CE marking in accordance with other European directives may be required.

General marking

For the marking of hydraulic valves there is a difference between the general product marking and the CE marking, if required, according to European directives.

CE marking according to the Machinery Directive

According to the Machinery Directive 2006/42/EC those hydraulic valves which are placed on the market as safety components according to Article 2.c) have been subject to mandatory labelling since the end of 2009 at the latest. Other hydraulic valves are not subject to CE marking either under the old European Machinery Directive 98/37/EC or the new Machinery Directive 2006/42/EC. These hydraulic valves do not require a declaration of conformity or manufacturer's declaration according to the Machinery Directive from the valve manufacturer.

However, some other European directives contain requirements that may require a declaration of conformity and CE marking.

CE marking according to the EMC Directive

Hydraulic valves, in particular continuous valves (such as proportional valves and servo-valves), are not finished products with an independent function for the end user and are not components intended to be incorporated into a device by the end user. They are therefore not considered as equipment and are not covered by the EMC Directive.
However, the instructions for EMC-compliant installation and wiring must be prepared and made available to the machine manufacturer. The manufacturer must observe the manufacturer's wiring instructions.

Are there any hazards on machines due to the sensitivity of the control of continuous valves (proportional valves, servo valves, with integrated electronics) against external electromagnetic fields, appropriate protective measures must be taken for the particular solution. Here the machine manufacturer must observe assembly rules and installation instructions. The declaration of conformity to the machine must certify compliance with the EMC Directive.

CE marking according to the Low Voltage Directive

Most valves have switching solenoids with nominal voltages of 12 V or 24 V and are therefore outside the scope of the Low Voltage Directive 2014/35/EC. If the operating voltage of the switching solenoid is between 50 V and 1000 V for alternating current and between 75 V and 1500 V for direct current a CE marking is required and a declaration of conformity must be issued.

CE marking according to the ATEX Directive

If the valve is intended for use in a potentially explosive atmosphere, CE marking and declaration of conformity are required. Due to the wide variety of versions and applications, it is not possible to make a general statement regarding the marking. In each case, an assessment of the individual application is required and a marking corresponding to the assessment must be affixed.

CE marking according to the Pressure Equipment Directive

The requirements for CE marking and declaration of conformity according to the Pressure Equipment Directive 2014/68/EU are generally not applicable to hydraulic valves, since control devices (valves) installed in machinery are excluded from the scope of the Directive as equipment according to Article 1 (2) j) ii) thereof. However, safety valves such as type-tested pressure relief valves, which are used as equipment components of pressure equipment, e.g. hydraulic accumulators, require CE marking and a declaration of conformity by the manufacturer.