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What Is Plug Valve?
Plug valves are valves with cylindrical or conically tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow passageways going sideways through the plug, so that fluid can flow through the plug when the valve is open. Plug valves are simple and often economical.
Rich experience
The company' s founder team graduated from mechanical and electrical automation majors and has been engaged in the valve industry for more than 20 years. It is committed to providing customers with a complete set of fluid control solutions. It is a company integrating scientific research and development, A large-scale valve enterprise integrating testing and testing, manufacturing and sales.
Wide product range
The company mainly produces API 6D pipeline ball valves, gate valves, globe valves, check valves, plug valves and API 609 series butterfly valves in 6 categories, with more than 1,000 specifications and varieties. Products widely cover petrochemical, coal chemical, nuclear power, LNG, marine, aerospace, metallurgy, papermaking and other industries.
Complete qualifications
The company has a complete international standardized management system, adopts the world's top precision casting technology and modern intelligent electronic detection system, and uses advanced SAP resource management, strip storage management system and ERP system to effectively manage the factory.
High standard products
After years of hard work and development, it has become a key backbone enterprise in the valve industry. It specializes in improving the innovation and manufacturing capabilities of special valves in harsh industrial environments. High-quality products and fast after-sales service have won praise and trust from customers at home and abroad.
Plug valves are designed to provide a low level of frictional resistance, allowing for smooth operation and easy opening and closing. This low frictional resistance also reduces the amount of wear and tear on the valve, increasing its lifespan and reducing the need for maintenance.
Another advantage of plug valves is their ability to provide tight shut-off. When closed, the cylindrical or conical plug completely blocks the flow of fluid, preventing any leakage or seepage from the valve. This makes plug valves ideal for applications where a high degree of shut-off is required, such as in critical process applications.
The design of a plug valve is relatively simple, consisting of only a few parts, including the body, plug, and stem. This simplicity makes plug valves easy to manufacture and maintain, reducing their overall cost and increasing their availability.
In the oil and gas industry, high temperatures and pressures are common. This also makes them an ideal choice for applications where safety is a concern.
Plug valves offer a high degree of flexibility in terms of their design and application. This flexibility makes plug valves an ideal choice for a wide range of applications in the oil and gas industry.
Make a valve system map
Make a system map that presents the location of all your valves. Give numbers to the valves on the map, and then make a guidebook that shows the Plug valve type, size, location description, and related notes. Some companies already demand this, in that case, verify the information and add unlisted valves. In the event of an emergency, this system map may save lives and time.
Keep the correct grease gun fittings
Various valve styles often require separate grease or lubrication fittings. For example, a plug valve may need a lube stick injection fitting or a "tall" giant button head fitting. These are sometimes known as "lube screws" and have either an NPSM thread down or a coarse bolt thread down. A perfect maintenance exercise is to have available spare fittings of each type in your toolkit.
Lubricate the plug of the plug valve
The main seal in older lubricate plug valves is metal-to-metal between the plug and valve body. When pressure is the employee to the valve through the lubrication fitting, it makes up in the lube sealant reservoir under the plug, eventually "lifting" the plug and forcing it away from the metal-to-metal seal.
Use the best lube sealant for the application
Valve lubricants must play the role of valve sealants, and sealants must also perform as lubricants to do their job correctly. Due to their dual purposes, we generally refer to them as lube sealants.
Types of Plug Valves
1.Lubricated plug valve
Lubricated plug valves incorporate small channels in the plug construction called radial holes that allow for the flow of a lubricant. The lubricant works along the length of the plug and on its seating surface. Because of the lubricant, the closing, opening, and throttling of a lubricated plug valve is made easier. Similarly, the lubricated plug valve prevents corrosion in the valve and promotes proper seating when closed.
2.Non-lubricated plug valve
Non-lubricated plug valves typically find use in low-pressure systems. Unlike the lubricated plug valve, non-lubricated plug valves have no form of automatic lubrication and are more prone to deterioration and wear. Due to this, non-lubricated valves are cheaper than their lubricated counterparts. This lends non-lubricated valves to best fit applications with small actuator torque requirements.
3.Multi-port plug valve
Multiport plug valves control the direction of flow in a system with specified plug cavities. Typically, multiport valves have more than two openings, yet flow is constrained to only two ports. Because of this, the plug design in a multiport plug valve is the biggest design factor to be considered.
4.Eccentric plug valve
Eccentric plug valves follow an eccentric path when operating the plug, meaning the plug is offset from the centerline of the seating ring. The plug in an eccentric plug valve contacts the seating ring only in the closed position. The open eccentric plug is not in contact with the seating ring when the valve is open.
High-pressure flow lines
These plug valves can handle high pressure hence they are used in high-pressure applications like coiled tubing, cementing, acidizing, high-pressure/temperature materials, etc.
Upstream applications
The lubricated plug valves are used here since they won't get clogged and can handle corrosive materials. They require proper maintenance in short intervals because of these conditions.
Flow control/isolation
The plug valves offer a great flow control/isolation of the materials because these valves can easily seal off and separate the liquids in order to avoid the contamination or mixing, which is a crucial method specific high-pressure application.
Oil & coal slurries
Plug valves don't get clogged easily, so that they can handle the abrasive types of materials they are also great at control & isolation, which makes them useful for working on Oil & Coal Slurries.
Selection criteria Plug Valve
1. Fluid type
Lubricated plug valves are better suited for corrosive, high-temperature and pressure, and abrasive fluid.
2. Flow control needs
A 2-port plug valve will suffice for simple on/off control. A 3-port plug valve can provide diversion and mixing operations.
3. Maintenance capabilities
If regular lubrication is not suitable, a non-lubricated plug valve is the better option.
4. Material compatibility
Ensure the valve's material is compatible with the media. For example, a plastic or specially coated plug may be necessary for corrosive media.
5. Size and end connections
The valve's size must match the pipe's size. The end connections (e.g., threaded, welded, flanged) should be compatible with the existing pipeline for easy installation.
Components of a Plug Valve
The plug valve body
The valve body has all the internal components of the valve. The body connects to the pipes through an end connection.
The plug valve stem
The stem of the valve connects the disc (or disk) to the actuator. This helps in transferring the movement of the actuator to the plug disc thereby opening or closing the plug disc. The plug valve has a little stem that connects to the disc.
The plug valve disc
The plug disc which is known as the tapered disc acts as a plug hence differentiating the plug valve and the globe valve. The major difference is in the way that how the disc looks like. The Globe valve has a cylindrical disc. The plug valve has a solid metal piece with tapered ends.
Round opening: It has round ports in both plug and body.
Rectangular opening: It has rectangular ports of the full bore section.
Standard opening: In this, the area through the valve is less than the area of the standard pipe.
Diamond opening: It has a diamond-shaped opening through the valve.
Multi-port: with three or more pipe connections used for transferring services.
Venturi design: It has reduced area opening with Venturi flow through the body.
ASME B16.10 – Face to Face and End to End Valve Dimensions
API 599 – Metal Plug Valves – Flanged, Threaded, and Welding Ends
API 6D – Specification for Pipeline valves
API 598 – Valve Inspection and Testing
API 6FA – Fire Test for Valves
BS 5353 – Specification for steel plug valves
BS 5188 – Specification for cast iron plug valves
MSS SP 61 – Pressure testing of steel valves
MSS SP 25 – Standard marking system for valves, fittings, flanges & unions
MSS SP 78- Gray Iron Plug Valves, Flanged and Threaded Ends
|
Size |
50NB — 600NB |
|
Pressure |
150PS1 |
|
Temperature |
0 Deg C - 1200 Deg C. |
|
Body , Chest |
Solid One piece casting of Cast Iron Fg 260, Cast Steel Gr WCB ,CF8,CF8M. |
|
Seat |
Integral to Body, Soft, Optional. |
|
Gate |
AISI SS 304,316,316L,317,317L |
|
Screw Spindle |
AISI SS 410,304,316. |
|
Nut |
Brass |
|
Yoke |
Plate type of MS . |
|
Gland Follower |
Cast Iron , Cast steel , Ductile Iron ,CF8,CF8M. |
|
Hand Wheel |
Cast Iron , Cast steel , Ductile Iron |
|
Gland Packing |
PTFE , PTFE Impregnated |
|
Ends |
Lugged |
|
Port |
STANDARD [Round], Optional V Port, Diamond Port,. |
Plug valves
The plug valves are characterized by simple structure, rapid opening and closing, and small resistance, but it is laborious to rotate, and it takes time to grind the plug during maintenance. The main difference between the plug valves and the ball valve is that the plug valves have better adjustment ability than the ball valve in terms of cutting off, but the advantage is not obvious. The sealing surface of the plug valves is much larger than that of the ball valve. The plug valves are closed or plunger-shaped rotary valve, which can be opened or closed by rotating 90 degrees to connect or separate the channel opening on the valve plug and the channel opening on the valve body.
Types of plug valves can be cylindrical or conical in shape. In a cylindrical valve plug, the passage is generally rectangular. Whereas in a conical valve plug, the passage is trapezoidal. These shapes make the construction of the plug valves light, and are most suitable for shutting off and on the medium and for diverting. However, depending on the nature of the application and the erosion resistance of the sealing surface, it can sometimes be used for throttling.
The ball valve
The opening and closing part (ball) of the ball valve is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control, among which there is a strong shear force between the V-shaped ball core of the hard-sealed V-shaped ball valve and the metal valve seat of hard alloy surfacing, which is especially suitable for fibers and tiny solid particles. etc. medium. The multi-port ball valve on the pipeline can not only flexibly control the confluence, diversion, and switching of the flow direction of the medium, but also can close any channel and connect the other two channels. This type of valve should generally be installed horizontally in the pipeline. The ball valve is divided into pneumatic ball valve, electric ball valve, manual ball valve according to the driving method.
The sealing effect of the types of ball valves is slightly worse, but it can achieve a large diameter. With the improvement of technology, the sealing effect of the ball valve is getting better and better. Therefore, in general, plug valves are mostly used in occasions with strict sealing requirements, but the caliber is generally small. The ball valve is used in occasions where the sealing effect is not too strict and the caliber is required to be large.
SUNAY is a professional manufacturer of valves. Headquartered in Anfeng Industrial Zone, Yongjia, Zhejiang. The company was established in 2010 with a registered capital of 10.8 million yuan and has three holding manufacturing companies. The company’s founder team graduated from mechanical and electrical automation majors and has been engaged in the valve industry for more than 20 years. After years of hard work and development, it has become a key backbone enterprise in the valve industry.
Q: What is the function of plug in valve?
Q: Do you grease a plug valve open or closed?
Q: Do plug valves have a flow direction?
Q: What makes a plug valve eccentric?
Q: Why use a plug valve instead of a ball valve?
Q: What are the different types of plug valves?
Q: Can plug valves be used for isolation?
Q: What type of lubricant is used in plug valves?
Q: How does a plug valve seal?
Q: How many turns does a plug valve have?
Q: Is a plug valve a shut-off valve?
Q: Are plug valves full port?
Q: What is the difference between plug valve and eccentric plug valve?
Q: What are the characteristics of a plug valve?
Q: Is plug valve linear or rotary?
Q: What is the problem with plug valves?
Q: Why is it called plug valve?
Q: How do you identify a plug valve?
Q: Which type of valve should never be used to throttle flow rate?
Q: What valve should not be used for throttling?
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