PID Controller Action : Directing Acting & Reverse Acting
Air to open/close valves and direction of control action Control valves come in two sorts: air to open; and air to close. Air to open valves are normally held closed by the…
Fundamentals of Valves and their Types
Valves are mechanical devices. They are basic elements with which the flow of fluids and pressure within a system can be regulated. They are mainly used to control the direction…
Types of Valve Actuators
Valve actuators are devices used to position valves. They can be used to fully open and shut a valve, or in an application that requires constant and precise control, such…
Types of Vortex Flow Meter Sensors
Types of Vortex Flow Meter Sensors are Thermal, Capacitive, Piezoelectric, Strain Gauge and Ultrasonic. It operates on the principle of Karman Vortex Street.
Valve Characteristics – Quick Opening, Linear & Equal Percentage
In essence a valve simply functions as a restriction in a flow line, with flow areas A1 and A2 and pressure differential p1 - p2, as shown in Below Figure. Valve Characteristics…
Short Notes on Different Valve Types
The essential function of a valve is to start, throttle and stop a fluid flow. Throttling, as shown in Below Figure, means regulating or controlling the rate of fluid flow. Different…
What is a Segmental Wedge Flow Meter?
The segmental wedge flow meter element has a V-shaped restriction cast or welded into a flanged meter body that creates a differential pressure.
Ultrasonic Doppler Flow Meter Advantages and Disadvantages
Ultrasonic Doppler flow meter transmits an acoustic signal into the flow stream at a specific frequency to measure the flow rate.
Transit Time Flow Meter – Types, Advantages, Disadvantages
Transmit time flow meter sends and receives the ultrasonic waves between transducers in both the upstream and downstream directions in the pipe.
Rate Compensated Heat Detectors Working Principle
Rate compensated heat detectors are designed to initiate an alarm when the temperature of the surrounding air reaches a predetermined level, regardless of the rate of temperature rise. Rate Compensated…
