Understanding the Basics of Electric Single-seat Control Valves

 
Electric single-seat control valves represent an integrated electronic structure with servo functionality, adept at accepting analog signals from control systems, transforming current signals into linear displacement. This facilitates continuous adjustment of process parameters such as pressure, flow, liquid level, and temperature, thereby enabling remote automatic control. This article delves into the structure, operational principles, and application characteristics of this control valve, further enriching our understanding of its functionality.
 

1. Structure and Types

 
Electric single-seat control valves are primarily classified into four structural types: single-seat, sleeve, double-seat, and cage. These types encompass various subtypes including three-way, angle, high-temperature, low-temperature, and bellows configurations. The single-seat valve boasts a simplistic structure, comprising components such as the valve body, seat, core, guide sleeve, bonnet, stem, and packing. Notably, the valve core can be of regulating (V-shaped) or shut-off (flat or conical) type, catering to diverse pressure differential conditions.
 

2. Operational Principles

 
Powered by compressed air, electric single-seat control valves employ electrical valve positioners, transducers, solenoid valves, and position-holding valves to induce valve body movement, altering the flow area between the core and seat for flow regulation. These valves adeptly receive signals from industrial automation control systems, enabling adjustment of parameters like fluid flow, pressure, and temperature. Depending on signal pressure fluctuations, these valves can either open or close, thereby managing fluid flow.
 

3. Application Characteristics

 
Primarily utilized in chemical, petrochemical, and metallurgical industries, electric single-seat control valves excel in regulating fluid flow. Their key attributes encompass minimal leakage, low-pressure differential tolerance, and limited flow capacity. These valves can be equipped with pneumatic or electric actuators, delivering substantial output force, sensitive operation, wide adjustment range, and easy maintenance. However, they are unsuitable for environments with high levels of contamination or significant pressure differentials.
 
In conclusion, electric single-seat control valves exhibit a plethora of advantages including simple structure, stable operation, and extensive adjustment range, rendering them pivotal in industrial applications. Their adaptability and versatility underscore their potential for widespread utilization in various industrial processes.