1. Introduction
1.2 Intended use
Intended use
Valves of the MV3 valve series in chrome-plated brass with PVDF valve seat seal are intended for use
with non-corrosive gases up to quality 6.0. In the stainless steel version with PCTFE valve seat seal,
they are also suitable for use with corrosive gases up to quality 6.0.
The permissible pressure range and the flow direction of the individual connections are specified on
the underside of the valve. The gas type is not specified, but results from the seal material used in the
respective model in compliance with standards ISO 11114-1 and -2.
Valves of the MV3 series are used to close off and re-open a gas line. Pressure is introduced via the inlet
connection (see labelling on the underside of the valve). Appropriate measures must be taken to prevent
the introduction of pressure via the outlet connections of the valve.
Valves of the MV3 series – if free of electrical components such as proximity switches, contact pressure
gauges or pressure transducers – may be used in areas with potentially explosive atmospheres, as the
fittings comprise no potential source of ignition in themselves (ignition hazard assessment in accordance
with DIN EN 13463-1). The ignition hazard must be taken into account in the case of valves with electrical
components. The ignition hazard must be evaluated based on the documentation for the respective
electrical components, taking into account their incorporation into the overall system, and Directives
2014/34/EU ("ATEX 114") and 1999/92/EC (ATEX 137) must be observed.
Foreseeable misuse
The following operating conditions are deemed to constitute misuse:
Operation with gases for which, as specified by the above-listed standards, the valve model in question
is not designed.
Use with gases in their liquid state
Operation outside the permissible technical limit values
Non-observance of the legal regulations and other
provisions valid on-site
Failure to comply with this Operating Manual
Failure to carry out inspection and maintenance work
Failure to heed the labelling and the information in the product data sheet
Pressurisation counter to the normal direction of flow
1.3 Personnel requirements
Definition of "authorised person"
Authorised persons are persons with technical training who have received technical instruction on the
gas supply system and the associated hazards and have successfully completed training courses on
"The supply of pressurised gases."
Tasks of the operating personnel
Operating personnel must be able to recognise and – in as far as possible and permissible – remedy faults
and irregularities.
Requirements placed on operating personnel
In order to perform their tasks, operating personnel must meet the following requirements:
The operating personnel must have received instruction in the operation of the MV3 valve series
from an authorised person and must have read and understood this Operating Manual in its entirety.
