Weld January 29, 2020
role of valves in piping

Role of valves in piping

A valve is a mechanical device that is playing a role in piping to control the flow of fluids either manually or self-operated. The word “valve” took from the Latin word “Valva” where the meaning of valva is “A moving part of the door”

INTRODUCTION, ROLE OF VALVES

The importance of valves in the industry always remains with its various sizes and functions. Whether the flowing material is in the liquid state or in the gas state, it is fully balanced and operated through the valve.Valves always play an important role in the industry even the fluid running in liquid, gas or powder state, valves use to install for various purposes in piping like: for isolation, regulation, non-return of fluid, and many times for special purposes also. We can classified valves into two types, Self- operated valves which are check valves, and other valves are  Operated valves. The selection of valves depends upon the nature of the fluid, what to handle with it like liquid, gas or powder.

APPLICATIONS:Role

Valves are used in almost every field, whether it is a simple home water tap or a process in an industrial field. Valves are widely used in almost every industrial process such as water and sewage processing, mining, processing of oil, gas, and petroleum, power generation, food manufacturing, chemical and plastic manufacturing, and many other fields.

ROLE, TYPES, AND FUNCTIONS:

A wild range of valves is using in today as required by industry and can be classified on various labels. Valves are classified as isolation valve, regulation valve, non -return valve and special valve as per their function.

ISOLATION VALVES:

Many types of valves are using as isolation valves like Gate valve, Ball valve, Plug valve, Piston valve, Diaphragm valve, Butterfly valve, and Pinch valve.

REGULATION VALVE:

Regulation valves are the Globe valve, Needle valve,  Butterfly valve,  Diaphragm valve, Piston valve, and Pinch valve.

NON -RETURN VALVE:

Non-return valves are check valves in which two types of valves are using like: Swing check valve and lift check valve.

SPECIAL VALVE:

: Valves that perform functions other than two-way isolation, such as multi-port, flushing, pressure relief, breather, and many other functions, called special valves. And they are used in special circumstances.

ROLE, SYMBOLS OF VALVES,

Symbols of valves

ROLE OF VALVES

valves classified based on end connections like:

Screw end, Socket end, Flanged end, Buttweld end, Wafer type end, Buttress end.

ROLE OF VALVES

BALL VALVE:

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Ball valves are rotational speed valves and are used for closed and throttling service. The flow control element consists of a sphere that rotates in a circular posture. Ball valves are available in full port design and regular port design according to the type of seat, soft seat and metal seat.

GLOBE VALVES

Globe valve

Globe valves are widely used in both flow control and throttling service in INDUSTRIES. They usually have circular bodies from which they are named. They are linear motion valves attached to a thin plug or disc, closed on the seating surface that acts as a flow control element,

GATE VALVES

role of valves in piping

The gate valve is a commonly used valve in the industry for on/of service, also known as knife valve or slide valve. It can be used for throttling service also. gate valve is a linear motion valve having a flat disk or wedge slide in the stream of flow to act as flow speed element. It considered a normal valve applied in various fields like heavy oils, light oils, varnishes, viscous liquids and many more

NEEDLE VALVES

role of valves in piping

This type of valve is used to make relatively fine adjustments to the flow of fluid. Needle valves can also be used for on / off and throttling services. This is accompanied by a thin ‘needle-like’ cone-shaped plug. Linear motion is a valve that acts as a flow control element. The fluid enters from the seat below which forms part of the flow path.
The needle plug allows the flow in this channel to open which is gradually increased or decreased. Needle valves are used for steam, air, gas, water, or other non-viscous liquids.

PINCH VALVES

role of valves in piping

These type of valves can be used for on / off and throttling services. Pinch valves are linear motion valves that use a flexible tube or sleeve to close the valve. Pinch valves are ideally suited to deal with slurries, fluid suspended solids and large amounts of corrosive chemicals.

DIAPHRAGM VALVES

role of valves in piping

The diaphragm valve is a pinch valve known as one of the oldest types of valves, basically used for viscous and corrosive liquids. it used linear stem movement for on / off and throttling. The diaphragm valve is excellent for controlling fluid flow containing suspended solids.A stud carries a flexible and flexible diaphragm for flow and thus acts as a flow control elements.

PLUG VALVES

role of valves in piping

The plug valves depicted in the figure below are also called plug cock or stop cock valves and they also date back to ancient times, when used in plumbing systems by the Romans. Today they remain one of the most widely used valves for both on / off and throttling services. The plug valve is a rotary moving valve that uses a cylindrical or tapered plug as a flow control element.The opening through the plug can be rectangular or round. Flow is regulated from closed to open during the 90 ° turn. If the opening is of the same size or larger than the inside diameter of the pipe, it is referred to as a standard port otherwise as a full port. Full port plug valves provide little resistance to flow when fully open, resulting in small pressure losses. One disadvantage of plug valves is its poor throttling characteristics.

BUTTERFLY VALVES

role of valves in piping

A butterfly valve, depicted in the figure below, is a rotary movement valve that is used on flow control and especially in throttling applications. The flow control element in butterfly valves is a circular disk with its axis at right angles to the direction of flow.

CHECK VALVES

role of valves in piping

Check valves are known as non-returning valves having two types Swing check valve and lift check valve. check valves are one of the oldest types. The main function of this valve to allow the fluids from one side and check from the other side.

ROLL OF VALVES

Valves are essential equipment that are using in today’s era.

CONCLUSIONS,

valves are using from our home appliances to industries, for all types of activities. In this way, we can say that the valves in piping are quite essential and enough to control the flow of fluids.