Our certificates
Our certificates
CERTIFICATE ČSN EN 15085-2, CL 1
Welding of components for applications in the field of railway rolling stock, according to the ČSN EN 15085 series of standards within the scope of classification level CL1, type of activity - production (P) 
CERTIFICATE ČSN EN 15085-2, CL 2
Welding of components for applications in the field of railway rolling stock, according to the ČSN EN 15085 series of standards within the scope of classification level CL2, type of activity - production (P)
Osvědčení o shodě řízení výroby
certificate no. 1221-CPR-0322
EN ISO 9001:2015
CERTIFIKÁT pro systém managementu
CERTIFICATE ČSN EN ISO 3834-2
Design and manufacture of steel structures in accordance with the requirements of EN 1090-1, 2 and 3 to performance class EXC3, in connection with the requirements of Regulation of the European Parliament and of the Council CPR 305/2011. Furthermore, pressure equipment according to EN 13445, piping systems according to EN 13480, aluminum tanks and pressure vessels according to AD 2000 Mbl. in connection with the requirements of PED 2014/68/EC. Furthermore, components and parts of railway rolling stock in certification level CL1 according to DIN/ČSN EN 15085-2, taking into account the requirements of ČSN EN ISO 3834-2:2006
CSN EN ISO/IEС 27001:2014
Information security management system in the field of mechanical engineering
AD 2000-Merkblatt HP0
verified and recognized as manufacturer of Pressure equipment
Directive 2014/68/EU, Annex I, point 3.1
This is to certify that the manufacturer applies a quality management system with relation to the welding technology. The manufacturer has demonstrated that the welding requirements for the manufacturing of pressure equipment are fulfilled.
ČSN EN 1090-2,3
Design and manufacture of welded steel and aluminum structures according to the requirements of the ČSN EN 1090-2, 3 standard up to design class EXС 3
EN ISO 14001:2015
Engineering, development, production, assembly and servicing of equipment for environmental support and other technologies, especially for air purification, waste disposal, ventilation, air conditioning, pneumatic transport and pressure vessels, production of components for rolling stock. Production of trailers.
Our certificates
In 2002, our company obtained a quality management system certificate according to ISO 9001: 2000, followed in 2006 by a certificate of environmental protection system according to ISO 14 001: 1996, which was issued by BVQI with Dutch accreditation.
Subsequently, a joint recertification of the ISO 9001: 2000 and ISO 14 001: 2004 systems by the certification company BVC took place in 2008. Also in 2008, our company proved compliance with the quality requirements in the welding process according to the standards ČSN EN ISO 3834-1,2 and DIN 18 800-7 / A1 and thus obtained a certificate from BVC.
In 2010, a complete certification (ISO 9001: 2008 and ISO 14 001: 2004) took place by the new company Det Norske Veritas, including certification of the occupational health and safety system according to OHSAS 18 001: 2007.
ZVVZ-Enven Engineering also holds certificates for soldering according to ČSN EN 13134 and 13133, execution of steel structures according to ČSN EN 1090-2, EC certificates of pressure vessel manufacturers according to PED, product certificates for export abroad (Russia, Ukraine, Kazakhstan) and others (ATEX, CEI approved products, EMC…)
ZVVZ-Enven Engineering holds the ISO 27001 - Cyber Security certificate
ISO 9001:2015
Commercial engineering activities, design, implementation and servicing of technological equipment and investment units in the field of waste gas purification, pneumatic transport, industrial air conditioning and ventilation.
ISO 14001:2015
Commercial engineering activities, design, implementation and servicing of technological equipment and investment units in the field of waste gas purification, pneumatic transport, industrial air conditioning and ventilation.
ISO 45001:2018
Commercial engineering activities, design, implementation and servicing of technological equipment and investment units in the field of waste gas purification, pneumatic transport, industrial air conditioning and ventilation.
ČSN EN ICO 3834-2:2006
Proces svařování 
Certifikát posouzení kvality
The manufacturer is authorized to manufacture pressure equipment manufactured under an assessed quality assurance system.
EN 1090 - 1:2009+A12011
Certificate of conformity of production control 
ČSN EN ISO/IEC 27001:2014
comprehensive services in the field of supplies of technological equipment and investment units
ČSN EN ISO 3834-2 2022
Production and assembly of welded steel structures, components and pipes
EN 1090-1 2009 A1 2011
Certificate of conformity of production control