Inst ToolsInst ToolsInst Tools
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Search
  • Books
  • Software
  • Projects
  • Process
  • Tools
  • Basics
  • Formula
  • Power Plant
  • Root Cause Analysis
  • Electrical Basics
  • Animation
  • Standards
  • 4-20 mA Course
  • Siemens PLC Course
Reading: 3 Port 2 Position Direct Acting Solenoid Valve Working Principle
Share
Font ResizerAa
Inst ToolsInst Tools
Font ResizerAa
  • Courses
  • Design
  • PLC
  • Interview
  • Control System
Search
  • Courses
  • Automation
    • PLC
    • Control System
    • Safety System
    • Communication
    • Fire & Gas System
  • Instrumentation
    • Design
    • Pressure
    • Temperature
    • Flow
    • Level
    • Vibration
    • Analyzer
    • Control Valve
    • Switch
    • Calibration
    • Erection & Commissioning
  • Interview
    • Instrumentation
    • Electrical
    • Electronics
    • Practical
  • Q&A
    • Instrumentation
    • Control System
    • Electrical
    • Electronics
    • Analog Electronics
    • Digital Electronics
    • Power Electronics
    • Microprocessor
  • Request
Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Inst Tools > Blog > Control Valves > 3 Port 2 Position Direct Acting Solenoid Valve Working Principle

3 Port 2 Position Direct Acting Solenoid Valve Working Principle

Last updated: April 13, 2019 2:25 pm
Editorial Staff
Control Valves Solenoid Valve
2 Comments
Share
4 Min Read
SHARE

The valve is 3/2 Direct Acting pressure balance design i.e. area at the Seat (Part-19) and balancing Plunger O Ring (Part- 80) are same, thereby air force acting on the Plunger Seat is nullified which makes the valve to work merely on the spring force throughout its pressure range.

Contents
3 Port 2 Position Direct Acting Solenoid Valve Manual Override Operation : Push & Turn TypeTesting of the Valve at the Test Bench

3 Port 2 Position Direct Acting Solenoid Valve

3 Port 2 Position Direct Acting Solenoid Valve Working Principle

In the de-energised condition of the valve Port-1 is blocked and Port-3 is connection to Port-2. Port-4 is connected to spring chamber of the Actuator which is connected to Port-3 also.

On energizing the valve, Plunger (30) pulls up thereby connecting Port-1 and Port-2 and blocking Port-3. Port-4 remains connected to Exhaust Port-3. When the inlet is connected to Port-1, air passes through the small hole provided in the Plunger and acts on upper side of Plunger O Ring (80).

When the valve is energized, the Plunger (30) pulls up because of which the lower orifice opens up thereby connecting Port-1 to the outlet Port-3 and the upper orifice at Sleeve (Part-101) gets blocked.

In this condition force acting on the Plunger (30) due to seat at the Sleeve (Part-101) and on the Plunger (30) due to Plunger O Ring (80) are same because of their equal area.

When the valve is de-energised Port-2 gets connected to Port-3. However, as Port-3 has smaller opening as compared to its size, first air enters into the spring chambers through Port-4.

3 port 2 position direct acting solenoid valve

 Manual Override Operation : Push & Turn Type

When the solenoid is de-energised and inlet and outlet ports connected to the applying rated pressure, the valve can be operated either pressing the Manual Override, when the same is released, the valve returns back to the normal position.

The valve can also be locked in energized position by pushing the Manual Override and rotating clockwise. To avoid Manual Override returning back to normal condition, ensure that the same is turned above 90º.

The valve can be brought to normal condition by turning Manual Override anti clockwise.

Testing of the Valve at the Test Bench

Check at least once in 3 years or following your routine maintenance schedule.

a) Apply rated pressure at inlet port of the valve.

b) Plug outlet port.

c) Check operation of the valve and leakage at the exhaust ports and pilot vent at the rated and minimum working pressure by applying 75% to 120% rated voltage.

d) While keeping the solenoid de-energised, check operation and leakage from exhaust and pilot vent ports of the valve at the rated and minimum working pressure by operating Manual Override.

e) Without connecting air supply to the valve, operate Manual Override. Energise and De-energise Solenoid to check for the plunger movement (normally movement should not be there) which can be checked by click sound. After operating Manual Override if plunger movement is found, reduce length of the manual override by 0.3mm from its taper end. Continue this till click sound stops.

f) Check the insulation resistance of the Solenoid by applying 500V DC at terminals and the solenoid housing. It should be more than 100 Mega Ohms.

Source: Rotex

Don't Miss Our Updates
Be the first to get exclusive content straight to your email.
We promise not to spam you. You can unsubscribe at any time.
Invalid email address
You've successfully subscribed !

Continue Reading

Speed of Actuators
Difference Between Linear Actuator and Rotary Actuator
Control Valve Performance with Constant Pressure
Air Filter Regulator Working Principle Animation
Control Valves Leakage Classifications
Control Valves Mechanical Friction Problems
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
2 Comments
  • Swapnil Patil says:
    December 5, 2016 at 2:27 am

    Thanks for sharing knowledge.

    How to differentiate between AC and Dc coil if nameplat is not present?
    How much resistance should be there across healthy sol. coil terminals of AC and DC coil?

    Thanks

    Reply
  • Amit patel says:
    March 7, 2017 at 10:40 am

    Very good initiative taken by author Mr. REDDY. Thank you for the same on behalf of all learners. Very informative & Handy. I support this ” Let’s Learn” concept .

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Stay Connected

128.3kFollowersLike
69.1kFollowersFollow
210kSubscribersSubscribe
38kFollowersFollow

Categories

Explore More

Control Valve Positioners
Trip Valve Principle
Lessons Learned from Actuator Passing Incidents
The Replacement Procedure for Control Valve Stem Packing
What is a Disc Valve ?
Pressure Relief Valve Terminology
What are Isolation valves? – Purpose, Types, Configurations
What is a Servo Valve? – Principle and Advantages

Keep Learning

Valve Leakage Tests

Types of Valve Leakage Tests

radial-vane damper

Dampers and Louvres

How to do Control Valve Sizing

How do you do control valve sizing in Layman’s terms?

Valves Pressure Loss - Questions and Answers

Valves Pressure Loss – Questions and Answers

Air Lock Relay Working Principle

Control Valve Air Lock Relay Working Principle

What is Directional Control Valve (DCV)?

What is Directional Control Valve (DCV)?

3-way solenoid valve Normally Open

What is a 3-way Solenoid Valve ?

Solving Critical Control Valve Hunting

Solving Control Valve Hunting: Instrument Troubleshooting

Learn More

Metric Prefixes and Unit Conversions

Metric Prefixes and Unit Conversions

Faceplates

What are Faceplates? How to Create a Faceplate? HMI Visualization

Communicating Delta PLC Software to Simulator

JMP instruction in PLC Programming

How to use JUMP Instruction in PLC Ladder Logic?

PLC Cooking Timer Example for Kitchen Automation

PLC Cooking Timer Example for Kitchen Automation

Tie rods double acting cylinder

What is a Pneumatic Cylinder?

DC Motor Applications in Industries

Classification of Solenoid Valves

Classification of Solenoid Valves

Menu

  • About
  • Privacy Policy
  • Copyright

Quick Links

  • Learn PLC
  • Helping Hand
  • Part Time Job

YouTube Subscribe

Follow US
All rights reserved. Reproduction in whole or in part without written permission is prohibited.
Welcome Back!

Sign in to your account

Username or Email Address
Password

Lost your password?