It is a low lift valve designed in a small size and with light weight to make it easier for installing pipes. The structure is simple and easy to maintain. The disk is either in metal or in a soft material, so you can choose the type that is most appropriate for the purpose. The spring has been manufactured within the range of the maximum effective stress of the material to ensure correct operation. It has been certified by the Occupational Safety and Health Agency. For the criterion for leakage, the API STD 527 standard applies.