The plug valve is a commonly used fluid control valve, widely applied in industries such as oil, natural gas, and chemicals due to its high sealing performance and ease of operation. The valve features a simple design, where a rotating plug controls the flow direction of the fluid, ensuring safe operation in systems involving high pressure, high temperature, and hazardous media. 1. Working Principle The core structure of a plug valve is a cylindrical or conical plug with a through passage. When the plug rotates, the passage aligns or misaligns with the fluid pathway of the valve body, thus controlling the opening and closing of the valve. (1) Open Position When the passage on the plug valve aligns with the fluid pathway of the valve body, the fluid can flow directly through the valve, ensuring an unobstructed flow. This design minimizes pressure loss during fluid flow, making it suitable for applications where maintaining stable flow is essential. (2) Closed Position When the plug is rotated 90 degrees, the passage becomes perpendicular to the fluid pathway, completely cutting off the flow of fluid, achieving the closed position. The 90-degree rotation of the plug valve allows for a complete shutdown of the fluid flow, offering a quick response, making it ideal for emergency shut-off applications. 2. Structural Characteristics (1) Types of Plug Valves Plug valves typically come in two types: conical and cylindrical plugs. The conical plug provides better sealing performance but may require additional lubrication or material support at high temperatures, while the cylindrical plug operates smoothly and is suitable for applications requiring frequent on/off operation. (2) Sealing Materials The sealing design of plug valves typically uses PTFE (Polytetrafluoroethylene) or other non-metallic lining materials, which offer high corrosion resistance and flexibility, ensuring good sealing performance even under high pressure. Additionally, some high-end plug valves employ metal-to-metal sealing for extreme environments, preventing seal failure. (3) Wear and Corrosion Resistance The internal materials of plug valves are typically made of corrosion-resistant materials such as stainless steel or nickel-based alloys, preventing wear caused by medium corrosion. This makes them suitable for transporting acidic or corrosive media and is commonly used in the chemical industry and refining systems. (4) Simple Maintenance The internal structure of the plug valve is simple, with no complex springs or valve disc mechanisms, making disassembly and maintenance relatively easy. In high-temperature and high-pressure environments, specific materials and designs can be selected to extend the valve’s service life and reduce subsequent maintenance costs. 3. Application Scenarios The application of plug valves is commonly found in critical situations where leakage prevention is essential, as well as in systems requiring rapid opening and closing or fluid shut-off. Below are ...
A sleeved plug valve is a specific type of plug valve designed with a non-metallic sleeve or liner that surrounds the plug, creating a tight seal. This sleeve, often made from materials like PTFE (polytetrafluoroethylene), ensures a low-friction, corrosion-resistant seal, making the valve suitable for various applications where leakage prevention, durability, and chemical resistance are crucial. 1. How Sleeved Plug Valves Work In a sleeved plug valve, the plug rotates within a sleeve liner rather than directly against the metal body. This design reduces wear on the valve body and allows for smoother, more consistent operation. When the valve handle is turned, the plug rotates, opening or closing the flow path. The sleeve not only provides a tight seal but also allows for a self-lubricating effect, enhancing the valve’s longevity and performance. 2. Key Features and Advantages (1) Leakage Prevention The non-metallic sleeve acts as a reliable seal around the plug, minimizing the risk of external leakage. This feature is especially important in industries handling hazardous chemicals, as it prevents leaks and potential environmental contamination. (2) Corrosion and Chemical Resistance Sleeved plug valves are ideal for handling corrosive or abrasive fluids. The PTFE or other chemically resistant materials used for the sleeve make the valve suitable for environments where standard metal-on-metal contact would degrade over time. (3) Low Maintenance Due to their self-lubricating design, sleeved plug valves require less frequent maintenance compared to traditional plug valves. The sleeve also absorbs some wear, reducing the need for frequent replacements and improving overall valve durability. 3. Applications Industries such as chemical processing, water treatment, and oil and gas frequently use sleeved plug valves due to their reliability and ability to handle tough operating conditions. These valves perform well in systems that require minimal leakage, resistance to aggressive fluids, and easy maintenance.
1. Core Function of Gate Valves Gate valves are primarily used for on/off control in industrial pipelines, where the valve is either fully open or fully closed. This makes them particularly suited for applications that require an unobstructed flow path with minimal pressure drop. 2. Best for Straight-line Flow Systems One of the ideal applications for gate valves is in straight-line flow systems where flow restriction must be minimized. When fully open, the gate valve provides a clear, uninterrupted flow path, making it an excellent choice for such environments. 3. Widely Used in Isolation Services Gate valves excel in isolation services, where they are used to completely block or allow flow. This makes them essential for systems that require reliable shut-off, such as those in the oil, gas, and chemical industries. 4. Ideal for Large Diameter and High-Pressure Systems For large diameter pipelines and high-pressure applications, gate valves are highly effective. They are commonly used in industries where both large volumes of fluid and high pressure must be managed, thanks to their durability and reliable operation. 5. Limitations in Use However, gate valves are not recommended for throttling, frequent operation, or for use in systems with debris. These conditions can cause wear on the valve seat, potentially leading to reduced performance over time.
The 4 inch cryogenic ball valve, designed as per API609, has many parts equipped RPTFE --It has the lowest coefficient of friction and the best corrosion resistance of any known plastic material, so that the valve can handle quite extreme situations.
Payment:
30% T/T When Order, 70% T/T Before ShipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
F316Method of Operation:
LeverQuick Details
|
Type |
Ball Valve |
|
Nominal Diameter |
4" |
|
NominalPressure |
300LB |
|
Construction |
Bolted Weld, Extended Stem or Bonnet, Full Port |
|
Connection |
RF |
|
Operation |
Lever Operated |
|
Body Material |
F316 |
|
Design Code |
API 607 |
|
Pressure & Temp |
ASME B16.34 |
|
End toEnd Dimension |
ASME B16.10 |
|
Connection Size of Flanges |
ASME B16.5 |
|
Inspection |
API598 |
|
Temperature Range |
-196℃~+120℃ |
|
Media |
Oil, Water, Gas |
Design Feature
Extended stem and bonnet to position the stem packing above the cryogenic fluid and provide a column of warmer vapor that insulates the stem seal from the effects of low temperatures.
High-density seats and seals throughout the valve enable the valve to be rated down to -196°C service.
Vent hole is in the upstream face of the ball. This prevents the cold liquids from becoming trapped in the valve.
Stem primary seal and bearing are located near the packing end of the extended stem thus keeping these parts from the low temperatures and providing a blow-out proof stem design.
Valves are specially cleaned to remove all grease and oils that may react with the service media
Each valve after cleaning is packaged and sealed in a heavy poly bag to keep the valve clean until installation.
Technical Drawing
Our Service
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1. Quotation within 24 hours or no later than 3 days
This will let you meet the quotation submission deadline and enhance your working efficiency
2. Weekly status report of your order
In this way, you will have a clear picture of your order. You do not need to waste time on pushing us for status update
3. An 18-month warranty period
A warranty certificate will issued after shipment and you will not have any concern after buying valves.
4. Solutions to complaints within 3 days
Quick and responsible actions to complaints will protect your reputation and reduce the financial loss as much as possible.
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The Class 1500 4'' cryogenic ball valve is designed with extended stem for low temperature application. The valve is made of LF2 with fully welded body, butt weld end and gearbox operation. Design Feature -Fully welded & forged body -Extended stem or bonnet -Full port design and piggable -Anti blow-out stem -Antistatic function - Automatic cavity relief -Bi-directional seat and DBB design -With stem and seat grease fittings Quick Detail Type Ball Valve Size 4" Pressure ANSI 1500 Construction One-Piece Body, Fully Weld, Extended Stem or Bonnet, Full Port Connection Butt Weld Operation Gearbox Operated Body Material Low Temperature Steel A350 LF2 Design Code API 6D Pressure & Temp ASME B16.34 End to End Dimension ASME B16.10 End Connection ASME B16.25 Inspection API 598 Temperature Range -46℃~+200℃ Media Oil, Water, Gas Related Knowledge What is the difference between full bore and reduced bore ball valve? The internal diameter of a full bore ball valve is the same as the inner diameter of the pipe. The full bore ball valve has little resistance and pressure drop to the flow. Plus, the full bore ball valve is piggable. However, the internal diameter of a reduced port (standard port) ball valve is smaller than the inner pipe size. Flow restriction caused by the reduced port will cause a pressure drop. And sometimes a pig to clean the pipe will get stuck in the reduced port ball valve. Certificates Dervos could provide reports upon clients’ requests, such as ISO 9001, PED CE, EAC, API 607, API 6D, API 6A and etc.
The forged steel ball valve is made of A105 body and 17-4PH trim with RTJ flange end and lever operation. This floating ball valve features reliable sealing performance and easy operation.
The PN10 DN200 double offset butterfly valve collects durable body and an easy replaceable seat for control services the power, chemical, petrochemical and other fields.
The DN80 PN16 cast iron gate valve has face to face dimension as per DIN3202 F4 or DIN3202 F5. This GG25 gate valve is designed with resilient seat, non rising stem, bb, RF flange, suitable for water treatment application. Quick Detail Type Gate Valve Nominal Diameter DN 80 Nominal Pressure PN 16 ConstructionType Non-rising stem, Bolted Bonnet, Resilient Seat ConnectionType Flanged OperationType Handwheel Operation Body Material Cast Iron GG25 TrimMaterial Cast Iron Wedge, SS420 Stem, EPDM Seat Design Code DIN 3352 End to End Code DIN 3202 Flange Dimesion DIN 2501 Medium Water Origin China Design Feature 1.Resilient seat for good sealing performance 2.Low flow resistance and small pressure drop 3.Non-rising stem for installation space is limited 4.No limitation for flow direction of medium 5.Epoxy painting available for internal and external part of the valve for anti corrosive function Company Brief Introduction Specializing in valve industry over 10 years, Dervos becomes the leading vendor of gate, globe, check, ball, butterfly, plug valves and strainers. We serve oil and gas user such as LUKOIL, MOL, YPF with local partners. Dervos show its advantages in: 1. Our partnerships with tens of stable suppliers allow us to provide customers with a wide range of high-quality products at a competitive price. 2. Each order is under strict quality control with inspection reports before delivery. 3. We value delivery time as much as our customers do. With the powerful purchasing system, we follow each order closely to secure on-time delivery. 4. One-stop solutions will be offered in a timely manner
The API 6D through conduit gate valve is designed with double expanding wedges, metal to metal seat and diversion hole for pigging. The valve has good performance on sealing, less flow resistance and is suitable for application with some solids or particles. Quick Detail Type Gate Valve Size 18'' Design Pressure ANSI 600 Construction Double Expanding Wedges, Fully Metal Seat, With Diversion Hole ConnectionType RTJ Flange OperationType Gearbox Operated Body Material WCB WedgeMaterial A105+STL+ENP StemMaterial 17-4PH SeatMaterial A105+STL+ENP Design Code API 6D Face to Face Dimension ASME B16.10 End Connection ASME B16.5 Pressure & Temp ASME B16.34 Medium Water, Oil and Gas Origin China
DN100 PN25 ball valve is made according to ISO 17292 standard. The valve body is made of A351-CF8M. It has the structural characteristics of T-shaped, floating ball, anti-fire, anti-static, anti-flying valve stem, bi-directional. Its connection mode is RF. And it has lever with dial operation mode.
2-1/2" 150LB butterfly valve is made according to API 609 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of double eccentric. Its connection mode is lug. And it has lever operation mode.
10’’ 300LB gate valve is made according to API 600 standard. The valve body is made of ASTM A217 C5 + STL. It has the structural characteristics of rising stem and bolt cover. The gate valve connected by flange has the operation mode of hand wheel.
The 1 inch 800LB female threaded globe valve has plug disc, reduced port and manual handwheel operation. The valve is made of A105N body and trim 5 as per API 602. Quick Detail Type Globe Valve Size 1'' Pressure Class 800 Construction Bolted Bonnet, Reduced Port, Outside Scew & Yoke ConnectionType NPT Female Thread OperationType Handwheel Operated Design Code API 602 End to End Dimension ASME B16.10 Connection ASME B1.20.1 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material Forged Steel A105 TrimMaterial 13CR+Stellite Temperature Range -29℃~+427℃ Application Water, Oil, Gas Origin China Product Range 1.Size up to 4 inch 2.Design pressure between 150LB to 2500LB 3.Connection: flange, socket weld, thread 4.Operation: handwheel, gearbox, bare stem, with actuators 5.Body material: carbon steel, stainless steel, alloy steel 6.Trim material: trim 1, 5, 8, 10, 12, 16 and ect. 7.Bolted bonnet, pressure sealed bonnet, welded bonnet, screwed bonnet 8.Reduced bore, full bore Inspection Reports Along with each order, Dervos will provide inspection reports and material test reports free of charge after shipment. All these certificates will let you have a clear picture of inspection process and results. Plus, these reports can be used for traceability.
8" 300LB globe valve is made according to BS1873 standard. The valve body is made of ASTM A216 WCB+STL. It has the structural characteristics of straight through type and rising stem. Its connection mode is RF. And it has gear operation mode.
The 150A JIS 5K globe valve is suitable for marine application. The Cast Iron globe valve is handwheel operated with FF flange.
The PN16 DN50 stainless steel flanged globe valve has straight pattern structure, bolted bonnet and handwheel operation. The OS&Y globe valve is designed as per DIN 3356. Quick Detail Type Globe Valve Norminal Size DN50 NorminalPressure PN16 Construction BB, Rising Stem, Plug Disc, Integral Seat ConnectionType Flange OperationType Gearbox Design Code DIN 3356 Face to Face DIN 3202 Flange End DIN 2543 Test & Inspection DIN 3230 Body Material Stainless Steel TrimMaterial Stainless Steel Temperature Range -196℃~+800℃ Medium Water, Oil and Gas Origin China Design Feature 1.Straight pattern body structure 2.OS&Y, Rising Stem 3.Bolted Bonnet 4.Available with bevel gear operation 5.Plug type disc 6.Little abrasion on sealing face during valve operation 7.Smaller installation space required Dervos Main Product Range With a complete product range, Dervos product lists cover gate, globe, check, ball, butterfly, check, plug valve and strainers. We can also provide marine valve, pressure reducing valve, control globe valve, wellhead valve and so on
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