Safety shut-off valve
A safety shut- off valve (also SAV ) separates a connected gas or liquid system from an inadmissible pressure on the other side of the valve . In many cases, safety shut-off valves serve to protect line systems from excessively high pressure due to failure of a pressure control. Its use can be prescribed by national and international regulations, such as the DVGW and ÖVGW regulations .
functionality
Direct acting valves
Direct-acting valves do not require any additional auxiliary energy. The upper and / or lower pressure is limited in an intermediate chamber by means of a pressure regulator . This chamber is separated from the side to be controlled by a movable but sealed mechanism. If the pressure on the side to be checked is higher or lower than that in the intermediate chamber, the component located in between moves and with it the main shut-off mechanism. Thus, both sides of the safety shut-off valve are separated from each other.
Indirect acting valves
Indirectly acting valves are operated by means of auxiliary energy, such as. B. compressed air actuated.
Application examples
An SSV is installed on gas or district heating connections in buildings , for example , in order to automatically shut off the media supply if the pressure reducer is defective. This prevents the high pressure from reaching the downstream pipeline upstream of the pressure regulator. SSV can be integrated in gas pressure regulators. In many cases, the limit pressure can be set within a certain range on the SSV.
literature
- B. Naendorf: Gas pressure regulation and gas pressure regulation systems. 3. Edition. Vulkan-Verlag, Essen 2010, ISBN 978-3-8027-5621-4 .
- DIN EN 14382, safety devices for gas pressure regulating systems and devices.