Safety valves used in pressure facilities and vessels

  • 1 Todor Kableshkov University of Transport, Sofia, Bulgaria


The publication presents systematized information on safety valves, as an important element ensuring the safe operation of highrisk equipment operating under pressure. Specific information and operating characteristics of the types of relief valves fitted to pressure equipment are shown.


  1. Ordinance on the design and safe operation of transmission and distribution gas pipelines and natural gas facilities, installations and appliances, (published in the State Gazette. number 67 of August 2, 2004, in force since September 3, 2004.)
  2. Ordinance on the device, safe operation and technical surveillance of pressure equipment, ((promulgated in the State Gazette, issue 64 of August 2, 2004, in force since September 3, 2004, last amendment and supplement published in the State Gazette, issue 61 of July 18, 2023))
  3. Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonization of the laws of the Member States concerning the making available on the market of pressure equipment (revised version). In legal force from July 19, 2016.)
  4. Komitovski, M.D., Static characteristics of double safety-relief valves, VMEI Scientific Session - Sofia, (1979)
  5. Komitovski, M.D., K.St. Grozdanova, Study of the stability of control valves in pressure regulators, Scientific session of VMEI - Sofia, (1988)
  6. Popov, M., Hydrodynamics, Sofia, Technica, (1973)
  7. Komitovski, M.D., . Elements of the hydro- and pneumatic drive, Technika, Sofia, (1985)

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