Control Valve Flow Characteristics

The correct answer is Linear, Equal percentage, Quick opening. These three types of flow characteristics refer to how the flow rate changes in response to changes in valve position. Linear flow characteristics means that the flow rate changes linearly with the valve position. Equal percentage flow characteristics means that equal increments in valve position result in equal percentage changes in the flow rate. Quick opening flow characteristics means that the flow rate increases rapidly as the valve opens. Therefore, the correct answer includes all three types of flow characteristics.

The statement is true because it states that the type 86(7)92/86(7)93 features a transfer element that implements 3 different characteristics. This implies that the type 86(7)92/86(7)93 has a transfer element and this element has the capability to perform three different functions or exhibit three different properties.

Linear characteristics are best used for liquid level or flow loops because they provide a consistent and proportional response to changes in the input signal. This means that as the liquid level or flow rate increases or decreases, the output signal will change in a linear and predictable manner. This is ideal for maintaining accurate and precise control over liquid levels and flow rates, as it allows for easy calibration and adjustment of the control system.

The statement is incorrect. It is possible to customize a characteristic. Customization allows for the modification or adaptation of a characteristic to fit specific needs or preferences.

Equal percentage valve (most commonly used in valves):
• Temperature and pressure control loops.
• Used in systems where large changes in pressure drop across
the valve are expected.