Control System

What are conveyors? Types of conveyors

What are conveyors? Conveyors are the mechanical system that moves materials one location to another. The transport systems allow fast and efficient transport for a wide variety of materials, which makes them very popular in the materials handling and packaging industries. The simplest continuous belt conveyor is shown below, also belt with the addition of flights would seem …

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Hydraulic System Basics

What is a Hydraulic system basically? The basic principle of a hydraulic system is derived from Pascal’s law, basically stating in a closed vessel that there are several holes in the same end so it will be emitted in all directions with the same pressure and flow amount. Where the pressure in a static fluid …

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Safety measures for a control system

Introduction Safety is addressed in the first control objective, and some control decisions, such as controlling the pressure in the flash process, have been made to satisfy safety requirements. However, special control system features are required, because of the importance of this objective. These features are often implemented in multiple layers. Basic Process Control System …

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Smoke control for HVAC system

The HVAC system discussed here is a variable-air-volume (VAV) system with an economizer. The economizer allows outdoor air to be used for cooling when conditions permit. The system shown below is a normal HVAC operating mode. This mode includes the return gate, the exhaust gate and the outdoor air damper modulating to adjust the amount of outside …

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What is a PID control action?

Introduction There are two basic actions of PID with respect to the control direction of MV.  These are direct action and reverse action. Direct action will lead the MV to increase when the PV is larger than the SV.(For example, cooling application)· Reverse action will lead the MV to decrease when the PV is larger …

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Level Control Valve with Horizontal Float

Introduction Level Control Valve with Modulating Horizontal Float is a hydraulically controlled, diaphragm actuated, control valve that controls reservoir filling to maintain constant water level, regardless of fluctuating demand.   Working operation   This float-controlled valve is equipped with a 2-way horizontal floating pilot assembly. The needle valve [1] allows continuous flow from the valve …

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