Different Types Of Valves And Their Functions Pdf

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This article is all about valves, and the various types of valves and fittings available. Valves are mechanical or electro-mechanical devices that are used to control the movement of liquids, gases, powders, etc.

Hello reader, In this article, we will read the Definition, Classification of the valve, and their functions. A valve is a component that controls and regulates the fluid or directs the flow of a fluid by various kinds of closing, opening, or by partially cut off fluid flow. So to controls the flow and pressure of fluid within a system, we used valves.


Straight forward and easy to understand training materials covering the most important concepts in valve automation. Customer reviews of products and testimonials are also included. View our entire library of videos.

Subscribe to our YouTube channel to me notified of new additions. See Assured Automation in the leading industry publications. Whenever we make news, we put a link to it here. A valve is a component in a piping system that is used to control the flow of the media through the system.

This control is achieved by the manipulation of some type of obstructer within the valve. Actuated valves use mechanical devices called "actuators" to operate the valve using a power source such as compressed air or electricity. Most actuated valves are also available in a manually operated version, or as an actuated valve with a manual override. All of the most common types of automated valves fall into one of three main categories. They are linear, rotary, and self-actuated.

There are a variety of valve types within each of these categories each having its own benefits. This training course is focused on rotary and linear actuated valves.

Examples of quarter-turn valves are ball valves, plug valves, and butterfly valves. Linear Valves There are 2 distinct types of linear valves: rising stem multi-turn and axial. While both valve types rely on the linear motion of the flow obstructer, they are very different in construction and operation.

Multi-turn rising stem valves move the obstructer by the rotation of a threaded rod stem which is attached to the obstructer Examples of multi-turn valves are gate valves, globe valves, pinch valves, diaphragm valves, and needle valves. These valve types are commonly used for flow control applications. Axial valves use pneumatic or electro-magnetic force to slide the obstructer along an axis. Some examples of these are coaxial valves, and angle seat valves. Ball Valves Quarter-turn 2-way ball valves are by far the most common type of process control valve.

They are 2-way inlet and outlet , 2-position open and closed valves that are used for shut-off or isolation of a system, or a loop or component within a system. Typically the ball has a bore straight through it. Media flows through this bore when the valve is open. These types of ball valves are covered in the lesson on Ball Valves. Throttling is possible, but not an ideal use for most standard ball valves. Specialty ball valves are available for throttling.

Plug Valves The basic construction of a plug valve is practically identical to that of a ball valve with the exception of the shape of the obstructer used. In this case, the ball is replaced by a slightly tapered cylinder. There are advantages to plug valves that make them the preferred choice in certain applications. One is that they contain no voids or cavities in which media can get trapped.

Another is that they can be adjusted to fix leaks that may develop over time, where as a ball valve would need to be repaired or replaced.

Plug valves are often used in extreme service applications such as refineries and chemical plants, where the environment of use is corrosive. Butterfly Valves In contrast to ball and plug valves, butterfly valves use a disc shaped obstructer.

Basic, general duty butterfly valves are called "resilient seated". They have a single seal ring that acts a a seal between the valve body and disc, as well as the seal between the pipe flanges and valve body. When the disc is perpendicular to the direction of flow, the flow is stopped.

Butterfly valves are commonly used on larger pipe sizes where a ball or plug valve would get very large, expensive, and heavy. If a manual actuator is used in a flow control application, it must lock into place, so that the force of the fluid does not rotate the disc in either direction. Most manual butterfly valves do incorporate this feature. Gate Valves A gate valve functions by moving a wedge shaped disc obstructer up and down to open and close the flow path through the valve.

This linear motion is provided by a threaded rising stem. Turning this threaded stem requires multiple revolutions multi-turn to travel from open to closed. There are 2-way globe valves that are a preferred choice for precise flow control and 3-way globe valves that are commonly used for mixing media from two inlet ports and directing that mixture through an outlet port.

Needle Valves These are very similar to a globe valves with 2 main differences. One, they are smaller and for finer control of flow on smaller lines.

Needle valves are meant for fine throttling flow control. Solenoid Valves Solenoid valves operate using a linear sliding obstructer that opens and closes the valve, or changes the flow from one outlet to another. There are many different types of obstructers used including plunger, shuttle, spool, and diaphragm.

The linear motion is achieved by energizing an electromagnetic coil to pull the obstructer in one direction. A spring drives the obstructer back in the opposing direction when the coil is de-energized. There are even proportional solenoid valves that can be used for flow control.

In these valves, the coil moves the obstructer varying distances based on the voltage supplied to it. Solenoid valves are relatively small. Their size is limited by the strength of the coil which is a result of the windings used to create a magnetic field when energized. In addition to the limit on strength of the coil, the flow paths and orifices in solenoid valves are rather small when compared to the line size.

This limits flow and increases the pressure drop through the valve. Common everyday applications include the water line on dishwashers and ice makers. In industrial valve automation, solenoid valves are also used to control the supply air to pneumatic actuators. If a high flow rate or small pressure drop is required, solenoid valves are not suitable. Coaxial or angle seat valves are required.

Most solenoid valves consist of a valve body on which various coil types can be attached. The coils come in a range of voltages with a variety of connectors, and electrical protection ratings. Further information on coil types is presented in Lesson Coaxial Valves Coaxial valves are 2-position valves that can be pneumatically or electrically actuated. The electric versions use an electromagnetic coil vs. The pneumatic versions use air pressure vs.

Coaxial valves use a shuttle type obstructer that the media travels through when open. Coaxial valves have a much larger flow path compared to solenoid valves, but still do not come close to a full port valve. That being true, there is again a limit on flow and an increase in pressure drop.

There are vastly different styles of coaxial valves. Coaxial valves will provide a smaller valve that operates more quickly while a ball valve will have higher flow rates with lower pressure drops. Angle Seat Valves Angle seat valves are 2-position valves with a built in pneumatic actuator. The actuator can be spring return or double acting.

The obstructer is a plug that enters the valve at an angle to sit in an angled seat molded into the valve's flow path. The plug gets retracted almost completely out of the flow path when open. This factor makes angle seat valves the highest flow fast-acting valves with the lowest pressure drop. They are faster acting, less costly, and longer lasting. Angle valves are particularly suited for use on low pressure steam applications below PSI.

Types of Valves Reference Chart. We Make Valve Automation Easy. My Account. Custom Valves. About Us. Site Map. Manual Valves. See any series for more info. Angle Seat Valves. Coaxial Valves. J Series Solenoid Valves. Actuated 2-way Ball Valves. Actuated 3-way Ball Valves. Actuated Butterfly Valves. Actuated Plug Valves. Actuated Globe Valves. Thermal Shut-Off Valves.

Actuated Valve Accessories Overview of all Acccessories. Eliminizer Compressed Air Filter-Dryers.

List of valves

Straight forward and easy to understand training materials covering the most important concepts in valve automation. Customer reviews of products and testimonials are also included. View our entire library of videos. Subscribe to our YouTube channel to me notified of new additions. See Assured Automation in the leading industry publications. Whenever we make news, we put a link to it here. A valve is a component in a piping system that is used to control the flow of the media through the system.

9 Types of Industrial Valves

Learn more. At their most basic, valves are devices that work to control, regulate or direct flow within a system or process. How a valve opens and closes will not only impact the overall performance but also determine how much control you have over the flow and how quickly the valve can operate.

Valves are mechanical devices that controls the flow and pressure within a system or process.

3.9: Valves - Types, Kinds, and Selection

Valves are devices used to control the flow of a fluid stream. There are different kinds of valves used in plants based on the needs. Shut off valves can be operated by hand or automatically. They are not used for controlling the flow. Control valves: These valves act as the correcting element of a control loop. Control valves are normally operated automatically, there are also hand operated valves. There are many types control valves eg: Globe valves, Butterfly valves, Ball and Plug valves, Pinch valves, Needle valves, Check valves,.

Control valves are imperative elements in any system where fluid flow must be monitored and manipulated. Selection of the proper valve involves a thorough knowledge of the process for which it will be used. Involved in selecting the proper valve is not only which type of valve to use, but the material of which it is made and the size it must be to perform its designated task. A complete control valve is made of the valve itself, an actuator, and, if necessary, a valve control device. The actuator is what provides the required force to cause the closing part of the valve to move. Valve control devices keep the valves in the proper operating conditions; they can ensure appropriate position, interpret signals, and manipulate responses.

Different types of valves are used in piping. In this article, I have covered classifications of valves and functions of valves. A valve is a device that regulates, controls, or directs the flow of a fluid by opening, closing, or partially obstructing fluid flow. A sound bit complicated? Ok, let me further simplified this. A valve is a mechanical device that controls the flow and pressure of fluid within a system or process.

The three basic functions of valves are: 1. to stop flow, 2. to keep a constant direction of flow, and 3. different types of valves and their features is given below.

Learn about the different types of valves used in the oil and gas industry and their differences: API and ASME gate, globe, check, ball, and butterfly designs manual or actuated, with forged and cast bodies. Forged valves are used for small bore or high-pressure piping applications, cast valves for piping above 2 inches. The different types of valves used in the petrochemical industry suit any of the following applications:.

Industrial valves have been around for more than a century. As applications become more specific and complicated, valves have evolved into nine major types to suit different requirements. These 9 types cover all industrial applications and services.

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Valves Guide

И в тот же миг осознала свою ошибку. Она ощутила запах Хейла, но повернулась слишком поздно. И тут же забилась, задыхаясь от удушья. Ее снова сжали уже знакомые ей стальные руки, а ее голова была намертво прижата к груди Хейла.

Любопытным шпикам не придет в голову сесть на хвост преподавателю испанского языка. - Он профессор, - поправила его Сьюзан и тут же пожалела об. У нее часто возникало чувство, что Стратмор не слишком высокого мнения о Дэвиде и считает, что она могла бы найти себе кого-то поинтереснее, чем простой преподаватель.  - Коммандер, - сказала она, - если вы инструктировали Дэвида сегодня утром по телефону из машины, кто-то мог перехватить… - Один шанс на миллион, - возразил Стратмор, стараясь ее успокоить.  - Подслушивающий должен был находиться в непосредственной близости и точно знать, что надо подслушивать.

Беккер старался придать своему лицу как можно более угрожающее выражение. - Ваше имя. Красное лицо немца исказилось от страха. - Was willst du.

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 - спросил немец с расширившимися от страха глазами. - Или мы придем к соглашению. - Какому соглашению? - Немец слышал рассказы о коррупции в испанской полиции.

Беккер повернулся и побежал, но успел сделать только один шаг. Мужчина выхватил оружие и выстрелил.

 Ой, дорогие мои… - сказала вдруг Соши. Она открыла на экране второе окно и просматривала остальную часть документов Лаборатории вне закона. - В чем дело? - спросил Фонтейн.  - Вы что-то нашли. - Вроде .

Смутные очертания тележки все еще виднелись у двери в мужской туалет, поэтому Беккер снова подошел к дамской комнате. Ему показалось, что внутри звучали какие-то голоса. Он постучал. - Hola.

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Types of Valves Used in the Oil & Gas Industry
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