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PID Controller Action : Directing Acting & Reverse Acting

S Bharadwaj Reddy
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

S Bharadwaj Reddy
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...

What is a Pneumatic Actuator ?

S Bharadwaj Reddy
Actuator : By themselves, valves cannot control a process. Manual valves require an operator to position them to control a process variable. Valves that must be operated remotely and automatically...

Control Valve Installation, Maintenance, Disassembly & Reassembly

S Bharadwaj Reddy
Control Valve Installation, Maintenance, Disassembly & Reassembly A. INSTALLATION 1. Valve Body: Set control valve in the horizontal line of piping in an accessible location with the arrow on the...

Control Valve Fail Safe Action

S Bharadwaj Reddy
There are two primary system considerations centering around an emergency operational situation for control valves. Control Valve Fail Safe Action I. Loss of instrument air supply (IAS) pressure II. Loss...

Installation and Maintenance of Control Valves

S Bharadwaj Reddy
Installation of a Control Valve When installing a control valve, please observe the following: Before installation, ensure that scales, welding chips or any other foreign materials have been cleaned out...

Thermostatic Valves Working Principle

S Bharadwaj Reddy
Thermostatic valves are used for the infinite, proportional regulation of flow quantity, depending on the setting and the sensor temperature. The valves are self-acting, i.e. they operate without the supply of...

Basic Parts of Control Valves

S Bharadwaj Reddy
A valve is a mechanical device that controls the flow of fluid and pressure within a system or process. A valve controls system or process fluid flow and pressure by...

Control Valve Positioner Working Principle

S Bharadwaj Reddy
A Control Valve Positioner is a device used to increase or decrease the air load pressure driving the actuator until the valve’s stem reaches a “POSITION” balanced to the output SIGNAL from...

Self Actuated Pressure Control Valve Principle

S Bharadwaj Reddy
Self actuated pressure control valve do not depend on any external signal for pressure control. As the name suggests, pressure in the process line itself is used as an actuating signal...

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