The gas pressure regulators are spring-loaded gas regulators with balanced plug, diaphragm command and contrast action by spring, suitable for low and medium pressure. Regulator and shut-off device are supplied with internal sensing lines. Both regulator and shut-off device are preset for connection to an external sensor line by the customer. They are widely used either in civil or industrial plants, using natural gas or LPG or non-corrosive gas. This regulator is equipped with an integrated slam shut valve that closes in case pressure goes over or/and under the set point limit.