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.
4" 150LB gate valve is made according to API 603 standard. The valve body is made of ASTM A351 CF8M+STL. It has the structural characteristics of bolt cover, elastic wedge and rising stem. Its test and inspection conform to API 598, and its operation mode is handwheel operation.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
ASTM A351 CF8M+STLMethod of Operation:
HW-OPProduct Description
|
Type |
Gate Valve |
|
Size |
4" |
|
Pressure |
150LB |
|
Connection |
RF |
|
Operation |
HW-OP |
|
Body Material |
ASTM A351 CF8M+STL |
|
Design Norm |
API 603 |
|
Face to face dimension |
ASME B16.10 |
|
Flange dimension |
ASME B16.5 |
|
Test & Inspection Code |
API 598 |
|
Temperature |
-29 ~ 425°C |
|
Applicable Medium |
Water, Oil and Gas |
Features
1. The fluid resistance is small, and the sealing surface is less scoured and eroded by the medium;
2. Simple structure, short structure length and wide application range;
3. Good manufacturing process, high temperature and high pressure resistance, and many optional materials.
Technical Drawing
Dimension Checking
Pressure Testing
Nameplate & Packing
Our Main Product Range
Dervos main products include ball valves, butterfly valves, check valves, gate valves, globe valves, and plug valves in different materials, sizes, standards and types as per clients’ requests.
If you are interested in our products and want to know more details,please leave a message here,we will reply you as soon as we can.
The stainless steel CF8M gate valve is designed with flange connection and handwheel operation per DIN 3352. The PN16 DN200 full port gate valve has OS&Y structure, resilient wedge and replaceable seat. Design Specifications Design and Manufacture: DIN 3352 End to End Dimension: DIN3202 Flange End: EN1092-1 Test & Inspection: EN12266-1/2 Design Feature -Full Bore Design -Superior flow rates & small friction loss -Low torque value for closing and opening the valve -Flexible wedge for better seating and ease of operation -Smooth finish and superior sealing for seat face -Every valve is manufactured with specific number on body for traceability Quick Detail Type Gate Valve Size DN 200 Pressure PN 16 Construction Bolted Bonnet, Rising Stem, Outside Screw and Yoke Connection Flange Connection Operation Handwheel Body Material Stainless Steel CF8M TrimMaterial Stainless Steel Temperature Range -268℃~+648℃ Medium Water, Oil and Gas Origin China Dervos Packaging Packaging is an important part we could never neglect. Dervos has a packaging process for each order to ensure a safe and clear delivery of the order.
DN200 PN40 gate valve is made according to EN1984 standard. The valve body is made of 1.4571+STL. It has the structural characteristics of bolt cover, elastic gate, rising stem and bracket. Its connection mode is EN1092-1/B. And it has hand wheel operation mode.
DN125 PN16 gate valve is made according to DIN 3352 standard. The valve body is made of 1.4408. It has the structural characteristics of bolt cover, rising stem, elastic wedge, with SS316 insulation jacket and structural length of 325mm. Its connection mode is RF EN1092-1 B1. And it has hand wheel operation mode.
2" 150LB gate valve is made according to API 600 standard. The valve body is made of A351 CF3. It has the structural characteristics of bolt cover, rising stem bracket. Its connection mode is RF. And it has handwheel operation mode.
DN400 PN10 check valve is made according to DIN standard. The valve body is made of WCB. It has the structural characteristics of swing type and structural length of 310mm. It has the connection mode of RF. This valve has a built-in damper, which is mainly used for shock absorption and energy dissipation.
24" 150LB Wafer check valve is made according to API 594 standard. The valve body is made of WCB. It has the structural characteristics of double disc. Its connection mode is lug type.
1/2" 150LB globe valve is made according to API 602 standard. The valve body is made of ASTM A105N+STL. It has the structural characteristics of pass-through type. Its connection mode is RF. And it has hand wheel operation mode.
The 12 inch 600LB trunnion mounted ball valve has gearbox, RTJ flange, fire safe design per API 607. The 3 piece ball valve is designed per API 6D. Design Feature & Benefit 1.Small flow resistance means less pressure drop 2.Simple valve structure and light weight 3.Diversified sealing material available, from metal material TCC, satellite, stainless steel to soft material PTFE, Teflon, Nylon, Peek and etc 4.Good performance of both metallic sealing and soft sealing 5.Convenient and swift operation of the valve 6.Easy to maintain due to renewable seat ring 7.When fully opened or closed, the valve sealing face is isolated from medium corrosion. 8.Wide range of application in terms of size and pressure rating Quick Detail Type Ball Valve Size 12" Pressure Class 600 Construction Trunnion Mounted Ball, Three-Piece Type, Side Entry Connection RF Flange Operation Gear Operated Body Material ASTM A105 Design & Manufacture API 6D Pressure & Temp ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.5 Test & Inspection Code API 598 Fire Safe API 607 Temperature Range -29℃~+200℃ Medium Water, Oil and Gas Origin China Material Specification No Part Name Carbon steel to ASTM Stainless Steel to ASTM WCB LCB CF8 CF8M CF3 CF3M 1 Underplate WCB LCB CF8 CF8M CF3 CF3M 2 Underplate Bolt A193 B7 A320 L7 A193 B8 3 Trunnion A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 4 Body A216 WCB A352 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 5 Bonnet Nut A194 2H A194 4 A194 8 6 Bonnet Bolt A193 B7 A320 L7 A193 B8 7 Cap A216 WCB A352 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 8 Gasket SS Spiral Wound/graphite or SS Spiral Wound/PTFE 9 Shaft Sleeve SS/graphite 10 Seat Ring RPTFE or POM 11 Ball A105/Ep.Cr or F6 A182 F6 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 12 Seat A105/Ep.Cr or F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 13 Spring 17-17PH(inconel for NACE)Ni-cr Alloy 14 O-Ring Viton 15 Stem A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 16 Sealing Cover A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 17 O-Ring Viton 18 Gear Actuator The material is according to ASTM standard Related Knowledge What is difference between floating and trunnion ball valve? The ball part of floating ball valve is movable. Under the pressure of medium, the ball has a certain displacement and presses on the sealing surface of outlet end to ensure its tight sealing. The floating structure is suitable for ball valve with small size and low & medium pressure rating. The ball part of trunnion mounted ball valve is fixed. Under the medium pressure, the floating seat will move towards the ball to ensure the sealing. The trunnion mounted ball valve is often with larger size and higher pressure.
1" 800LB gate valve is made according to API 602 standard. The valve body is made of A182-F5. It has the structural characteristics of rigid gate, welded bonnet and extended valve body 100mm. Its connection mode is BW*NPT. And it has hand wheel operation mode.
The cast iron butterfly valve belongs to double offset type. also is soft seal butterfly valve,It owns a compact body, low torque value, and perfect sealing function, suited for water application with normal temperature range. Quick Detail Type Butterfly Valve Nominal Size DN500 Nominal Pressure PN10 Structure Double Offset, Soft Seated Connection Type Flange Type Operation Gear Operated Design Code EN 593 Face to Face EN 558 End Connection EN 1092 Test & Inspection EN 12266 Body Material Cast Iron GGG50 Temperature Range -15℃~+150℃ Application Water, Oil, Gas Dimension Checking & Pressure Testing Tag & Packing
11/2" 800LB globe valve is made according to API602 standard. The valve body is made of A105+STL. It has the structural characteristics of welded bonnet. Its connection mode is SW. And it has hand wheel operation mode.
6" 150LB gate valve is made according to API 600 standard. The valve body is made of ASTM A217 WC6. It has the structural characteristics of bolt cover, elastic gate, rising stem, OS&Y, full bore, body valve seat. Its connection mode is RF (125~250AARH）. And it has hand wheel operation mode.
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