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: Pressure Relief Valve Terminology
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 > Pressure Relief Valve Terminology

Pressure Relief Valve Terminology

Last updated: July 10, 2020 2:14 pm
Editorial Staff
Control Valves
No Comments
Share
4 Min Read
SHARE

Here we shall learn about Pressure Relief Valve basic terminology and types of PRV used in industrial process control.

Contents
Pressure Relief ValveTypes of Pressure Relief Valve1. Conventional Pressure Relief Valve2. Balanced Bellow Pressure Relief Valve3. Pilot-operated Pressure Relief ValveRupture Disk

Pressure Relief Valve

Pressure Relief Valve Terminology

Pressure Relief Device

It is designed to open during an emergency or abnormal conditions. It is actuated by inlet pressure.

Spring Loaded Pressure Relief Device

It is designed to automatically close to prevent the flow of fluid.

Relief Valve

It is used for Incompressible fluids.

Safety valve

It is used for Compressible fluids.

Actual Discharge Area

The measured net area that determines the flow through a valve.

Curtain Area

Area of cylindrical or conical discharge opening between seating surfaces above the nozzle seat created by lift or disk.

Effective Discharge Area

Equivalent Flow Area computed of a relief valve. (Less than Actual Discharge Area)

Huddling Chamber

Annular Pressure chamber in the valve located beyond the seat for rapid opening.

Lift

Actual travel of the disk from its closed position.

Maximum Operating Pressure

Maximum expected pressure during operation.

Maximum Allowable Working Pressure (MAWP)

At a designated temperature, maximum gauge pressure that is allowed at the top of the vessel. (Basis for pressure setting of relief devices)

Design Gauge Pressure

It refers to the most coincident temperature and pressure during operation. (<= MAWP)

Accumulation

Pressure increase over MAWP during discharge through a relief device.

Set pressure

Inlet gauge pressure at which relief device is set to open.

Overpressure

Pressure increase over set pressure of relief device.

Back Pressure

The pressure which exists at the discharge of the relief device. (Super-Imposed + Built-up)

Built-up Back Pressure

Increase in pressure in the discharge header as a result of flow after the device opens. (friction loss is a type of backpressure)

Super-Imposed Back Pressure

Static pressure that exists at the outlet of relief device at the time it is required to operate. (Constant or Variable)

Blowdown

Difference between the set pressure and closing pressure of the relief device. (expressed as % of set pressure)

Operating Pressure

The value of increasing static pressure at which there is the measurable lift of the disk.

Closing Pressure

The value of decreasing static pressure at which disk comes at the seat and lift becomes zero.

Types of Pressure Relief Valve

The following are the general types of pressure relief valves (PRV) are as follows.

1. Conventional Pressure Relief Valve

It is a spring-loaded valve whose performance characteristics are directly affected by changes in the backpressure of the valve.

2. Balanced Bellow Pressure Relief Valve

It is a spring-loaded valve that incorporated the means for minimizing the effect of Back Pressure on the performance characteristics.

3. Pilot-operated Pressure Relief Valve

It is a pressure relief valve in which the main valve is combined with and controlled by an auxiliary pressure relief valve.

Rupture Disk

A rupture disk is a non-reclosing differential pressure relief device that is designed to function by bursting the pressure-containing rupture disk. It includes a rupture disk and a rupture disk holder.

Interest to add any further points? Share with us through below comments section.

Author: Kalpit Patel

Read Next:

  • Control Valve Accessories
  • Three Way Valve Manifold
  • Testing of Solenoid Valve
  • Solenoid Manual Override
  • Valve Safety Factor
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 Accessories – Principle, Purpose, Advantages
What is a Boiler Pressure Relief Valve?
Difference between RTJ and T&G Flange Facings
What is Plug Valve ?
What is Shutdown Valve?
Constant Flow Valve Principle
Share This Article
Facebook Whatsapp Whatsapp LinkedIn Copy Link
Share
Leave a Comment

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

What is a Spool Valve? – Types, Configurations, Applications
What is Needle Valve ?
Control Valve Installation, Maintenance, Disassembly & Reassembly
Types of Failures in Control Valves
What is a Electric Motor Actuator ?
Types of Control Valves
Valve Terminology Glossary
Working Principle of Self Operated Valves

Keep Learning

Metal Seated Ball Valves

Metal Seated Valves and Soft Seated Valves : Differences

control valve sizing problem

Importance of Proper Control Valve Sizing

Diaphragm Valves

How Diaphragm Valves Work ?

Piston Check Valve

What is Piston Check Valve ?

Fail-Close Valve

What is a Fail-Close Valve? – Advantages and Disadvantages

Kv-value of a valve is determined by a standardised test

Calculate Flow Coefficient Kv of Solenoid Valve

Control Valves Basic Theory

Control Valves Theory

What is a Hydraulic Valve

What is a Hydraulic Valve? and their Types

Learn More

CNC Milling Machine

CNC Milling Machines: What Are They And How Do They Work?

Supermarket HVAC Ventilation System

Supermarket Ventilation System – HVAC Basics

HART Communication Problems

HART Communication Problems

Turbine to Gearbox Alignment Drifts Caused Pump Transfers Problems

RCA Related to Trip Throttle Valve (TTV)

Globe Control Valve Animation

Basics of Globe Valves

Siemens S7-200 PLC

Programmable Logic Controller (PLC) Questions and Answers – 13

Electrical Machines Questions and Answers

Induction Motors Operating Characteristics Questions

100 Instrumentation Questions

100 Instrumentation Basics Questions

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?