Valve Desk

04/01/2022

06/01/2021

Steam Desuperheater Working and Types:- The equipment which is used to bring down the temperature of a superheated steam is called a steam desuperheater...

03/04/2020

Deluge Valve Operation:-
A Deluge system (automatic High Velocity Water Spray System) is a fixed fire protection system, which totally floods an area with pressurized water through a system of piping with open nozzles & sprinklers.

03/04/2020

Reference-https://www.e-pneumatic.com
How Do Flow Control Valves Work?

https://www.e-pneumatic.com/blog/flow-control-valves/

…

03/04/2020

Please refer the below link regarding different control valve controllers.

https://blog.kimray.com/what-is-a-control-valve-controller/

Every oil and gas control valve needs a control valve controller. Also known as pilots, controllers tell valves when to open and close.

03/04/2020

https://www.arcweb.com/blog/what-control-valves

A control valve regulates the rate of fluid flow as the position of the valve plug or disk is changed by an actuator. Control valves are used to maintain a process variable as close as possible to the desired set point.

02/04/2020

Selecting the Right Valve for your application:-

Suitability of the valve type can be defined. There is no single valve type which suits all applications Each type of valve plays a specific role. So it’s important to know which one to choose for the task at hand. Let’s take a look at few Valves that are widely used for control applications

Globe Valves:-

Ideal choice for Good control in case of high differential pressure applications. These Valves are ideal for noise reduction with clean flow media and can also be used for micro flow service.

Maintaining or retrofitting of Globe Valve is easy, which is especially helpful if process conditions change quickly or plant capacity increases marginally.

Butterfly Valve:-

Butterfly Valves are lightweight, economical solutions and are especially attractive valve solutions in large sizes. Butterfly Valves offer near linear flow and are ideal for instances which require limited pressure drop.

Plug Valves:-

These Valves are a compact and reliable solution for general and even more demanding applications. These valves are widely used in refineries and petrochemical plants, as they can also handle Slurries and viscous fluid. Plug Valves are best suited for applications which require zero residue inside the valve.

02/04/2020

Flow co-efficient:-

The most important valve parameter for calculating the size of a control valve is the flow coefficient, Cv. Calculation of Cv depends upon degree of compressibility of fluid

02/04/2020

Selecting a Control Valve -

A control valve is a power operated device capable of modulating flow at varying degrees between minimal flow and full capacity in response to a signal from the controlling system. Control valves play a major role in the everyday effort to increase process plant profitability and conserve energy.

Understanding the Controlling of the Valve
Control valve basically follows the instruction received from controlling loop (sensing element and the controller) Sensing element sends a signal to controller which is intern conveyed to the positioner mounted on the Valve. The Postioner controls the position of the valve through actuator.

Parameters for selection-

To select a right fit option following parameter of the media are very important. Such as state (vapour, liquid or two-phase), vapour pressure, flow-prate, inlet and outlet pressures, inlet temperature, density, molecular weight, viscosity, specific heat ratio, critical temperature and critical pressure.

Also, while defining the flow-rate, one should include certain safety margin. One must also consider ambient conditions at site, system geometry, pipeline sizing, MOC, fail-safe position etc.

02/04/2020

01/04/2020

18/01/2020

PID stands for Proportional Integral Derivative. PID controller is used to control final control element with proper controller tuning.

18/01/2020

How to choose a control valve depends on the basic requirements and selection depend on their ability to perform specific functions.

17/01/2020

Valve Condition Monitoring involves the seamless collection and interpretation of valve condition data by valve diagnostics experts

17/11/2019

What will control unit mean??

- The pressure to be regulated is transferred to the pressure control valve mechanism via the control unit.

The pressure functioning on the control surface closes (pressure reducing valve) or opens (backpressure regulator) the valve against the spring force.

Three construction varieties are distinguished:
1. diaphragm
2. piston with O-ring and different seals
3. bellow

17/11/2019

How will cavitation damage be contained?

-Several ways exist for treating cavitation in control valves. The primary is to pick out valves with high values of fl (recovery factor) eliminating cavitation.

The second is to make sure that the plug and seat area unit product of a material which will resist the damage (e.g. stellite hard facing).

The third is to control wherever the bubbles collapse and keep this aloof from vulnerable elements (for instance on the brink of internal surface of valve body or pipe).