The appearance of normal close and normal close are the same, just difference: normal close stype:NC,when power off ,it will pull .When power on,it will push. One: technical parameter. The of working voltage: 12V (9-15V DC) 24V (18-30V DC) : 12V-2.0A 24V-1.0A (full of action current moves in place automatically disconnect the power supply, the working current of Less than 15mA) In of control working current: Less than 15mA. Travel: 53 + 1mm. The maximum tension: 90N. Material: Plastic+Metal Color as shown An ambient temperature: -30 to 60 C The action time: less than 2 seconds An overload protection extinguisher: the load is too or stuck, stop working automatically,avoid flameout device damage. Disconnect the power off after a period of time, re power,extinguisher from fault reset, can resume normal work. Two, flameout device wiring: The flameout device has 3 lead wires, as follows: Red: connect the positive power supply: the cathode of a power supply (yellow green or blue)as of control: Closed type: control line power extinguisher action, action in place, automatic stop.Release extinguisher power control line, automatic stop action in place. Three, installation and notice The installation and commissioning should the extinguisher action in place before,Crude Oil engine stop control rod no action to the limit position and the extinguisher stuck,otherwise the extinguisher internal overload protection circuit, automatic flameout device stops working, the extinguisher should disconnect the power, adjust the mounting position, back to the extinguisher on electricity, flameout which can resume normal work. Package Contents: 1X Solenoid Valve Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.