Valve

Safety Relief Valve: A Pressure Relieving Device

Table of contents: 1. Relief System 2. API 521 Sizing Criteria 3. Relief System – Pressure Terminology 4. Code Requirements 5. Pressure relieving methods 6. Relief valves 7. General Types of Safety Relief Valve Design 8. Advantages / Disadvantages Conventional Valve 9. Balanced Bellows Spring Loaded Safety Relief Valve 10. Advantages / Disadvantages Balanced Bellows Valve 11. Piston Type Pilot ...

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Vendor Drawing Review (VDR): Valve Specific Requirements

Specific Requirements : In the previous post we had discussed about the general requirements relating to the vendor drawing review (VDR) for the manual valves. But there are few requirements which are specific depending upon the type of the valves. These requirements are specified below based on valve type- Gate, Globe & Check Valves Ball Valves Butterfly Valves Double Block ...

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Vendor Drawing Review: A Review of Valve Drawings

Introduction to Vendor Drawing Review Vendor drawing review (VDR) is a review of valve drawings indicating cross sectional view, material of construction with respect to purchase requisition (PR)requirements / data sheets. Piping material engineer shall well understand  the Project/Client/contract specifications to take care of any requirements specified therein which need to be reflected in the drawing before taking up this ...

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Solenoid Valve – An Electromagnetic Part Of A Control Valve

Introduction to solenoid valve The solenoid valve is an electromagnetic part of a control valve. A solenoid valve is an electromechanically operated valve used for controlling liquid or gas flow. Solenoid valves are the prime means of enabling/disabling air supply to pneumatic actuators and are a critical element in the pneumatic actuation circuits of single and double acting pneumatic actuators. ...

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Plug Valve: An Isolation Valve

Table of contents: 1. Non-Lubricated Plug Valve 2. Lubricated Plug Valve 3. Eccentric Plug Valve 4. Expanding Plug Valve A plug valve is a quarter-turn on-off valve. The plug can be cylindrical or tapered and has a variety of port types. Plug valves are available in either a lubricated or non-lubricated design. Plug valve ends can be flanged, hub type ...

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Pressure Vacuum Relief Valve – Part 1

Table of contents: 1. Purpose of Pressure/Vacuum Relief Valves 2. How Pressure/Vacuum Relief Valves Function 3. Advantages of Pressure/Vacuum Relief Valve Purpose of Pressure/Vacuum Relief Valve In reality, properly sized opening on the tank roof protects the tank from rupture or imploading.  However, it constantly outbreath and inbreath and during outbreathing cycle it losses the vapour to atmosphere and possesses ...

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Types of Breather Valves

Basic function of breather valve The breather valve also known as pressure/vacuum relief valve is a protective device mounted on the top of a fixed roof atmospheric storage tank.  Its primary function is to conserve the loss of storage tank content when the tank is in out-breathing mode.  The purpose & selection of breather valve is mainly to control the ...

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Flush Bottom Valve: Special Purpose Valve

Introduction to Flush Bottom Valve Flush Bottom Valve  is a special purpose valve, which is used in piping, reactors and vessels to drain out abrasive, Slurry, Viscous Material or Semi Solid Media. This type of valve is available in the size from 15 MM to 150 MM with different material of construction like Cast Iron, Cast Steel, SS 304 / 316 ...

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Special Purpose Valve: Multi-port Valve

Introduction to Multi-port Valve Valves which perform duties other than the two way isolation, control and check are classified under the category of special purpose valves, few of such valves are Multi-port valves. Flush bottom valves Float valves Foot valves Multi-port Valves Multiport valve is categorized as a special purpose valve. The multi-port valve on certain services reduces the time for ...

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Piston Valve: Isolation Valve used in Piping Industry

Piston valve resembles in construction more towards a globe valve and is mainly used for shut off and regulation. This valve provides positive shut off. The shut off assembly comprises of a metal piston, two resilient valve rings and a metal lantern bush. The sealing surface consists of the outer vertical surface of the piston and the corresponding inner surfaces of ...

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