control-valves-classification

Types of Control Valves

Control valves are available in different types and shapes. They can be classified in different ways; based on: (a) action,

Transistor Output Wiring

PLC Output Types

PLC outputs are of two types: 1. Relay. 2. Solid state. Relay outputs are mechanical contacts and Solid State outputs are like transistor, TRIAC.

Control Valve in Last Position

Control Valve Fail Safe Action

There are two primary system considerations centering around an emergency operational situation for control valves. Control Valve Fail Safe Action

Earth Meter Working Principle

How Earth Resistance is Measured

The term “earth resistivity” expressed in ohm-centimeters (abbreviated ohm-cm) is one basic variable affecting resistance to earth of an electrode