We design and manufacture safety valves strictly certified under the most relevant international standards, ensuring protection, operational precision and safe performance in the most demanding industrial environments.
Five decades strengthening industrial safety
Founded in 1976, Valnac (formerly Válvulas Nacional) was created to respond to the needs of Spain’s emerging chemical and petrochemical industries. Over the years, our expertise, specialization and production capacity have positioned us as a benchmark manufacturer for leading companies in sectors such as oil, refining and other auxiliary industries.
All our products comply with the European directives PED 2014/68/EU and ATEX 2014/34/EU, and are designed and manufactured under a strict ISO 9001:2015 quality system. This combination of regulatory rigor, technical knowledge and commitment to excellence enables us to deliver safety valves that protect processes, facilities and people in any operational environment.
In this new context, Synerkos—the group’s new commercial brand—will integrate our valves into its solutions, while Valnac continues to reinforce its position as a specialised manufacturer with international reach, expanding capabilities and raising safety standards in every project.
At Valnac, we manufacture a wide range of safety valves to address diverse operational needs: from overpressure protection to emergency relief, vacuum relief or noise reduction in critical processes.
Model 64
Angular safety valve with 90º instantaneous opening, full nozzle, spring-loaded, available in conventional or balanced versions.
Model 55
Angular safety valve with 90º full rapid opening, semi-nozzle, spring-loaded.
Model 51
Angular safety valve with 90º opening, full nozzle, spring-loaded, available in conventional or balanced versions, threaded or flanged.
Model 3-51
Angular safety valve with 90º opening, full nozzle, spring-loaded with adjustment ring, available in conventional or balanced versions, threaded or flanged.
Model 3-50
Angular safety valve with 90º opening, full nozzle, spring-loaded and equipped with an adjustment ring.
Emergency valve 2000
Designed for installations with storage tanks, it ensures rapid evacuation of large fluid volumes in case of overpressure caused by fire.
Pressure Relief Valve 3400
Relief valve for overpressure and vacuum with flanged and threaded connections. Three types available: Breather & Vacuum, Vacuum, and Breather flanged with heating jacket.
Pilot-Operated Safety Valve
Pilot-operated pressure relief valve capable of operating at a significantly higher set pressure than spring-loaded safety valves. Its operation and lift are unaffected by backpressure.
Valve Silencers
Products engineered to attenuate high-level sound emissions (often above 150 dBA), especially in high-frequency ranges between 1,000 and 8,000 Hz.
