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Solenoid Valve Terms

Analog Position Sensor – Position sensor whose voltage output differs through various values.

Bubble-Tight Sealing – A circumstance in which there is no leakage of air from between the internal sealed ports of the valve, whether in the energized position or not, in a five second time period. Soap bubbles are used to detect leakage.

Closed State – A situation in which the tubing is pinched in the valve.

Coil Voltage – The maximum voltage to which the coil must be energized for the valve to achieve its highest specified capacity.

Continuous Duty – Energizing a solenoid valve at a constant level of power for its entire on-time.

Current Drain – The quantity of current in amperes flowing through a solenoid valve coil when it is energized.

Cycle – The normal opening and closing of a valve.

Cycle Rate – The measure of how many times a valve is able to open and close within a set period of time.

Duty Cycle – Proportion of time that the solenoid receives power.

Flow Control – A feature that allows for the manual reducing or controlling of flow.

Flux Plate – Magnetic steel plate that helps transmit magnetic flux in the magnetic circuit of a solenoid valve from the enclosure to the sleeve construction. A flux plate is necessary on valves with a body construction consisting of a non-metallic body.

Frequency Response – Changes with the output variable in steady-state conditions, caused by a sinusoidal input variable.

Gain – Association of input to output or the sensitivity of a device.

Hysteresis – The variation between up-scale and down-scale outcomes in equipment response, when exposed to the same input from the opposite direction.

Normally Closed – A term that refers to a valve that is closed when unenergized.

Normally Open – A term that refers to a valve that is open when unenergized.

Open Loop – A system in which direct feedback is not supplied to gauge the response.

Position Sensing – Employing electronic sensors to watch the position of the valve and provide electronic feedback.

Pulse and Hold – Increases function of solenoid valves by reducing power consumption and heat generation. The valve is opened and held open at decreased power.

Pulse Width Modulation (PWM) – A technique that utilizes a modulated wave function to control analog devices.

Repeatability – The ability of the equipment to generate consistent results on successive tests.

Stroke – The space the plunger covers during a state change.