Welcome to the hardhatengineer.com.
I am Varun Patel.
In this video, you will learn the different parts of valves.
The valve is assembled product.
It consists of various parts.
Knowing of this part is must if you are working with valve.
Watch this video till the end so that you will learn about
• Body • Bonnet
• Disk • Seat
• Stem • Trim and
• Actuator that used in valve.
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Body The valve body is the main pressure retaining
part that also houses other valve parts such as disk and seat.
Here you can see that body also provides passage for fluid to flow from the valve.
Ends of valve body connect with piping.
These ends can be flanged, threaded and butt welding types that depends on size and pressure
of the piping system.
Valve bodies can be cast or forged in different materials such as cast steel, stainless steel
and alloy steel depending on the requirements.
Bonnet Bonnet is a second pressure retaining part
of the valve.
It is also known as a cover.
It connected with valve body by bolting, welding or threading to create valve enclosure.
In case of gate, globe, stop check, and diaphragm valves, it has an opening so that the valve
stem can pass through it.
Bonnet provides access to valve internals, during maintenance.
Usually, it contains a stuffing box and also support yoke, and operating mechanism of the
valve.
Disc The disc is the part which allows, throttles,
or stops flow, depending on its position.
In the case of a plug or a ball valve, the disc is called a plug or a ball.
A valve disc could be cast, forged, or fabricated.
A disc is seated against the stationary valve seat or seats when the valve is in the closed
position.
It can be moved away from the valve seats by motion of the valve stem, with the exception
of check and safety-relief valves, in which the disc is moved away from its seat by fluid
flow and pressure.
Seat Seat is one of the main components that directly
affect the leakage rate of the valve.
Seat can be an integral part of valve body or made of forged ring or of non-metallic
material.
A valve may have one or more seats.
In the case of a globe and a swing-check valve, there is one seat, which forms a seal with
the disc to stop the flow.
A gate valve has two seats; one on the upstream side and the other on the downstream side.
Multiport plug and ball valves may have several seats, depending upon the number of ports
in the plug or ball.
Stem Stem is forged solid rod or shaft.
The valve stem transfers the required motion to the disc, plug, or the ball for opening
or closing the valve.
It is connected to the valve handwheel, actuator, or the lever at one end and the valve disc
on the other.
In gate or globe valves, linear motion of the disc open or close the valve, while in
plug, ball, and butterfly valves, disc is rotated to open or close the valve.
Note that stop-check valves, check valves do not have stem.
Trim The removable and replaceable valve internal
parts that come in contact with the flow medium are collectively termed as valve trim.
These parts include valve seat, disc, glands, spacers, guides, bushings, and internal springs.
API standard has standardized trim materials by assigning a unique number to each set of
trim materials.
Actuator The actuator is a mechanism that operates
the valve.
It is connected to the stem and disk assembly.
It may be manually operated by a handwheel, manual lever, gear, chain or it can be operated
through motor, solenoid, pneumatic, or hydraulic mechanism.
Some valves are self-actuated such as check valves.
There are may types and sub-types of these components.
You can learn all that along with more than 18 types of valve in detail, buy my course,
how to be an expert in piping valves.
Link is given in the description.
This is all about components of valves.
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See you soon goodbye take care.
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