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: What is Blowdown Valve (BDV)?
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 > What is Blowdown Valve (BDV)?

What is Blowdown Valve (BDV)?

The primary function of a Blowdown valve is to control the concentrations of suspended & total dissolved solids (TDS) in the boiler.

Last updated: November 13, 2020 6:22 pm
Editorial Staff
Control Valves
2 Comments
Share
3 Min Read
SHARE

The blowdown valves are used for operation in the open position. The main function of the blowdown valve is mainly to control a continuous flow of steam/fluid under high differential pressure.

Contents
Blowdown Valve (BDV)Applications of Blowdown valvesTypes of Blowdown valvesContinuous Blowdown (CBD) valvesIntermittent Blowdown (IBD) valves

The outstanding feature of this type of valve is that it can maintain fluid-tightness and it is easily operated without the help of any wedging action.

Blowdown Valve (BDV)

What is Blowdown Valve (BDV)

Applications of Blowdown valves

The primary function of a blowdown valve is to control the concentrations of suspended & total dissolved solids (TDS) in the boiler.

Boiler blowdown is a severe service application which results in rapid erosion and wearing out of conventional valves.

Types of Blowdown valves

Continuous blowdown is usually an on-going process, whereas intermittent blowdown is performed on an as needed basis.

Continuous Blowdown (CBD) valves

Continuous Blowdown (CBD) valves are designed to operate in continuous open position by releasing water continuously through a blowdown tap near the boiler water surface, thereby maintaining the TDS level in the boiler drum.

Continuous Blowdown Valve is an angle type valve with a needle shaped trim in a venturi diffuser. The venturi diffuser provides sufficient area for the high velocity flashing water, thereby avoiding choked flow.

Intermittent Blowdown (IBD) valves

Intermittent Blowdown (IBD) valves are designed to operate at predetermined intervals by releasing water & accumulated sludge periodically through a blowdown tap near the bottom of the boiler.

The primary requirement of these valves is to provide tight shut-off even after repetitive blowdown operations.

Earlier, these two functions (blowdown and sealing) were performed by two different valves installed in series and operated in a definite sequence.

Intermittent Blowdown Valve carries out both these functions in sequence i.e. blowdown in open position and sealing in closed position.

This is achieved by providing a multi-step throttling plug, which splits the total pressure drop across each step.

The sealing area is separate from the throttling area, which reduces erosion and provides leak tightness even after prolonged usage.

Read Next:

  • Control Valve flow coefficient
  • Interview Questions on Valves
  • Control Valve Animation
  • Valve Flow Characteristics
  • Control Valve Connections
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

What is Cage-guided Globe Valve ?
Effect of Differential Pressure on Control Valve Lift
Flow Control Valves Interview Questions
Inspection and Test Requirement of Control Valves
Control Valves Theory
Difference between Globe Valve and Gate Valve ?
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
2 Comments
  • S M Shoaib says:
    February 10, 2020 at 3:16 pm

    Very important information is available here.

    Reply
  • Arghama De says:
    July 1, 2020 at 12:23 pm

    Very informative article. I have a doubt, please clarify.

    Is it a good engineering practice to take close feedback of battery limit shutdown valves before open command goes to BDV during depressurization?
    Please share the reason.

    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

Malfunctioning Inlet Check Valves caused chaos at Compressor stop/trip
Control Valve Testing for Noise Measurement
Control Valve Interview Questions and Answers
Valve Safety Factor
What is a Pneumatic Cylinder?
Troubleshooting Common Control Valve Problems
Deluge Valve Operation
Air Pressure Regulator Questions

Keep Learning

Control Valves Chemical attack Problems

Control Valves Chemical attack Problems

What is Poppet Valve?

What is Poppet Valve? When we Use a Poppet Valve?

Solenoid Valve

Solenoid Valve Troubleshooting Practices

Piping Schematic for Two Solenoid Valves Double Acting

Different Types of Control Valve Actuators

Installation of a Control Valve

How to Install a Control Valve?

valve trim

Valve Actuator Bench Set

Procedure for the Repair of Control Valve

Basic Steps and Procedure for the Repair of Control Valve

fluid flow reversed through a Control Valve

What happens when Fluid Flow Reversed through Control Valve?

Learn More

why-lel-important-in-gas-detection

Why LEL important in Gas Detection?

Liquid management using PLC programming

PLC Programming for Loss in Weight Liquid Systems

Cable Gland Parts

What is a Cable Gland ?

Control valve positioner calculation

Calculate Control Valve Stem Position

Address Overlapping in Tia Portal

How to Check Address Overlapping in Tia Portal?

Simple PLC example Hardware configurations

Muting Functions of Safety Control Circuits – PLC Example

Workstation Healthiness Checks

Workstation Healthiness Checks

Commissioning Checklist for Industrial Automation System

Commissioning Checklists for Industrial Automation Systems

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?