What is a 4-way Solenoid Valve?
When a pneumatic actuator requires air pressure applied to two different ports in order to move two different directions (such as the case for cylinders lacking a return spring), the…
What is a 3-way Solenoid Valve ?
3-way solenoid valves operate in a manner analogous to single-pole double-throw (SPDT) electrical switches: with two paths for flow sharing one common terminal. 3-way solenoid valves have three ports for…
What is a 2-way Solenoid Valve ?
2-way solenoid valves operate in a manner analogous to single-pole single-throw (SPST) electrical switches: with only one path for flow. Solenoid valve symbols often appear identical to fluid power valve…
Functional Testing of Control Valve Positioners
Valves, the actuators that move them, and the electronic circuits that control them, are all subject to aging soon after they are installed. Valve seats wear from repeated seatings and…
Control Valve Installation, Maintenance, Disassembly & Reassembly
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…
PID Controller Loop Tuning Questions and Answers – Part 2
PID Controller Loop Tuning Questions and Answers 1. Examine this process trend showing the PV, SP, and Output of a loop controller: Based on what you see here, determine the following:…
PID Controller Loop Tuning Questions and Answers – Part 1
This article provides PID controller loop tuning conditions for different conditions to analyze Process Variable, Set Point and Controller Output trends. PID Controller Loop Tuning Questions and Answers 1. Examine this…
Good and Bad Wiring Practices
Good and Bad Wiring Practices If you ever find yourself working at a facility where you witness something as awful as what you see here, you have a professional obligation…
What is a Electric Solenoid Actuator ?
A typical electric solenoid actuator is shown in Below Figure. It consists of a coil, armature, spring, and stem. Note :Â Electric Solenoid Actuator also called as ON/OFF valve or Solenoid…
Electrical Motor Starter Circuits
Manual DOL Starter : Contactor Controlled DOL Starter : Read : Simple DOl Starter using PLC Motor Star Delta Starter : Read : Star - Delta Starter Principle Motor Auto…
