File Name: different types of valves and their uses .zip
Body; connected to the pipe Bonnet; mounted on the body to form a tight enclosure Stem; attached the structure gate or disk that resist the flow. The body of the valve is flanged with bolt holes in them to be held together with pipe; with a gasket in between to provide a leak-proof connection Valves,Types and Operations.
Valves, Types and Operations
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.
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Types of Manual Valves
Valves are mechanical devices that controls the flow and pressure within a system or process. They are essential components of a piping system that conveys liquids, gases, vapors, slurries etc.. Different types of valves are available: gate, globe, plug, ball, butterfly, check, diaphragm, pinch, pressure relief, control valves etc. Each of these types has a number of models, each with different features and functional capabilities. Some valves are self-operated while others manually or with an actuator or pneumatic or hydraulic is operated. There are many valve designs, types and models, with a wide range of industrial 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. Valve categorization depends on several considerations. For this article, valves are categorized according to the functions.
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.
Butterfly valve and globe valve. Butterfly valve and ball valve. Butterfly valve and gate valve.
Many different types of manual valves are used in industrial applications worldwide. The following article will cover the general mechanism and function of the most typical of these valves used in steam systems, such as ball valves , butterfly valves , globe valves , gate valves , and diaphragm valves. For further details jump down to: ball valve , butterfly valve.
There are a number of different plumbing valves used to control the flow of water in a building.
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. The gate valve is a regular type valve that is used in any process plant.
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?
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