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: How Needle Valve Works ?
Share
Notification Show More
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 > How Needle Valve Works ?

How Needle Valve Works ?

Last updated: May 13, 2019 3:48 pm
Editorial Staff
Control Valves
2 Comments
Share
2 Min Read
SHARE

Needle valves are designed to allow precise flow control. Its name is derived from the sharp pointed disc and matching seat. They are extensively used for continuous blow-off or chemical feed control services.

Contents
Needle Valve WorksUses of Needle Valve

The stem threads are finer than usual so that considerable movement of the hand wheel is required to increase or decrease the opening through the seat. Usually, these valves have a reduced seat diameter in relation to the pipe size.

Needle valves Images

Needle Valve Works

A variation on the stem-guided globe valve design is the needle valve, where the plug is extremely small in diameter and usually fits well into the seat hole rather than merely sitting on top of it.

Needle Valve Schematic

Needle valves are very common as manually-actuated valves used to control low flow rates of air or oil.

A set of three photographs shows a needle valve in the fully-closed, mid-open, and fully-open positions (left-to-right):

Needle Valve Pictures

Uses of Needle Valve

Needle valves are usually used in flow-metering applications, especially when a constant, calibrated, low flow rate must be maintained.

Since flow rates are low and many turns of the valve stem are required to completely open or close, needle valves are not used for simple shutoff applications.

Since the orifice is small and the force advantage of the fine-threaded stem is high, needle valves are usually easy to shut off completely, with merely “finger-tight” pressure. The spindle and/or seat of a needle valve, especially one made from brass, are easily damaged by excessive turning force when shutting off the flow.

Articles You May Like :

Valve Seat Leakage Test

What is Lift Check Valve ?

What is Port-guided Globe Valve ?

Control Valve Working Animation

Control Valve Performance

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

Control Valve Positioners
Control Valves Pre-Commissioning Checklist
How to Solve On-Off Valve Problems?
Pilot-operated Safety and Relief Valves
What is a Servo Valve? – Principle and Advantages
What is Gate Valve ?
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
2 Comments
  • Kevin Rish says:
    February 18, 2021 at 8:34 pm

    I agree with you

    Reply
  • Nadiah Wan says:
    February 9, 2022 at 1:26 pm

    Hi

    Do we use needle valve as isolation for instrument item?

    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

Valve Actuator Bench Set
Types of Valve Leakage Tests
Working Principle of Pneumatic Actuators
Solenoid Valve with Manual Reset Working Principle
Progressive Control Valve Sequence
Valve Functions and Basic Parts of Valve
Control Valve Erosion Problems
Gas Valve Sizing

Keep Learning

Control Valve Whisper Trim Cage

Problem with Choked Control Valve with Whisper Trim Cage

Ball Valve Material Selection

Ball Valve Material Selection

control valve parts

Common Terms Used in Control Valves

Control Valves Multiple Choice Questions

Control Valves Multiple Choice Questions

electric motor actuator principle

What is a Electric Motor Actuator ?

valve control system

Solenoid Valves Practical Problems

Exclusive Valve Sequencing

Exclusive Control Valve Sequence

What is Blowdown Valve (BDV)

What is Blowdown Valve (BDV)?

Learn More

Test Automation in Production Environment

Test Automation in Production Environment – Everything You Should Know

Simatic S7 PLC Backup Steps

How to take Backup from Siemens S7-300 PLC?

Agriculture Projects

170+ Agriculture Engineering Projects List​

3-port-2-position-direct-acting-solenoid-valve

3 Port 2 Position Direct Acting Solenoid Valve Working Principle

Pressure Gauge Calibration according to Standard DKD-R-6-1

Pressure Gauge Calibration according to Standard DKD-R-6-1

PLC Program for 2 Push buttons to Control 1 Output

PLC Program for 2 Push buttons to Control 1 Output

Tuning Fork Level Switch principle

Tuning Fork Level Switch Principle

Process Automation

What is Process Automation? – Simple Automation Example

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?