Method for testing the operability of a solenoid valve of a safety valve having a valve member; 1.1 wherein the safety valve has a single-acting pneumatic actuator with a drive fluid for positioning the valve member; 1.2 wherein the safety valve has a positioner which adjusts the pressure in the drive fluid and thereby controls and/or regulates the position of the valve member; 1.3 wherein the valve member assumes a safety position when the pressure in the drive fluid corresponds to an ambient pressure; 1.4 wherein the solenoid valve is pneumatically connected between the actuator and the positioner and is used to vent the actuator to ambient; 1.5 wherein, in the event of a safety case, both the solenoid valve and the positioner vent the actuator to ambient; characterized in that the method comprises the following steps: 1.6 the safety case is triggered, as a result of which the valve member should move to its safety position; 1.7 the temporal progression of the position and the velocity and/or the acceleration of the valve member after the safety case has been triggered is recorded; 1.8 the time interval needed for the valve member to assume the safety position is determined; 1.9 the time interval is compared to a reference value and 1.9.1 the recorded temporal progression of the velocity and/or the acceleration is compared to a previously stored reference characteristic curve; 1.10 if the time interval is longer than or equal to the reference value, or the recorded temporal progression of the velocity and/or the acceleration runs below the reference characteristic curve by more than a predetermined amount, then the test of the operability of the solenoid valve is considered failed; 1.11 if the time interval is shorter than the reference value and the recorded temporal progression of the velocity and/or the acceleration runs above the reference characteristic curve by more than a predetermined amount, then the test of the operability of the solenoid valve is considered passed. 1.1 wherein the safety valve has a single-acting pneumatic actuator with a drive fluid for positioning the valve member; 1.2 wherein the safety valve has a positioner which adjusts the pressure in the drive fluid and thereby controls and/or regulates the position of the valve member; 1.3 wherein the valve member assumes a safety position when the pressure in the drive fluid corresponds to an ambient pressure; 1.4 wherein the solenoid valve is pneumatically connected between the actuator and the positioner and is used to vent the actuator to ambient; 1.5 wherein, in the event of a safety case, both the solenoid valve and the positioner vent the actuator to ambient; 1.6 the safety case is triggered, as a result of which the valve member should move to its safety position; 1.7 the temporal progression of the position and the velocity and/or the acceleration of the valve member after the safety case has been triggered is recorded; 1.8 the time interval needed for the valve member to assume the safety position is determined; 1.9 the time interval is compared to a reference value and 1.9.1 the recorded temporal progression of the velocity and/or the acceleration is compared to a previously stored reference characteristic curve; 1.10 if the time interval is longer than or equal to the reference value, or the recorded temporal progression of the velocity and/or the acceleration runs below the reference characteristic curve by more than a predetermined amount, then the test of the operability of the solenoid valve is considered failed; 1.11 if the time interval is shorter than the reference value and the recorded temporal progression of the velocity and/or the acceleration runs above the reference characteristic curve by more than a predetermined amount, then the test of the operability of the solenoid valve is considered passed.