In industrial piping systems, gate valves are generally considered low-resistance isolation valves. When the valve is fully open, the gate is completely withdrawn from the flow path, allowing the fluid to pass through with minimal obstruction. However, from a strict engineering perspective, not all gate valves are classified as full port valves. If the seat bore is equal to or very close to the pipeline internal diameter, the flow experiences little or no restriction. In this case, the valve can be considered full port (or near full port). This design is commonly used in oil and gas pipelines, water transmission systems, and other applications where low pressure drop is required. If the seat bore is slightly smaller than the pipe internal diameter, a minor flow restriction will occur inside the valve. In such cases, the valve is more accurately described as reduced bore. This configuration is more common in smaller sizes or cost-optimized valve designs. In engineering practice, a simple selection logic can be applied: ● If the system requires minimum flow resistance or pipeline pigging, the valve bore must match the pipeline diameter. ● If the valve is used for general isolation purposes, most standard gate valves can already meet the required flow capacity. Therefore, a concise conclusion can be drawn: Gate valves are typically close to full port designs, but whether they are truly full bore depends on whether the seat bore equals the pipeline internal diameter. QA Q1: Are gate valves always full bore?Not necessarily. If the seat bore equals the pipe internal diameter, the valve can be considered full bore. If it is slightly smaller, it is classified as reduced bore. Q2: Why do gate valves have relatively low flow resistance?When the valve is fully open, the gate is completely removed from the flow path, allowing the fluid to pass through in a nearly straight line, which results in low pressure drop. Q3: Are gate valves suitable for high-flow pipelines?Yes. If the system requires low pressure drop, gate valves are commonly used. Q4: Is the concept of full port the same for gate valves and ball valves?Not exactly. For ball valves, the bore size is determined by the ball port diameter, while for gate valves, it is mainly determined by the seat bore diameter.
Large diameter ball valves are commonly used in industries such as petroleum and chemical processing, power generation, long-distance pipeline transportation, and large-scale water treatment systems. If installation is not performed correctly, it may lead to sealing leakage, valve jamming, or structural stress damage. Therefore, proper installation practices are essential to ensure long-term stable operation. 1. Pre-installation Inspection If pre-installation inspection is insufficient, operational failures are more likely to occur during service. First, inspect the valve body for transportation damage. If scratches, impact marks, or deformation are found on the valve body or sealing surfaces, installation should be stopped and the supplier should be contacted. Next, verify valve model, pressure rating, and connection standards. If the system design pressure does not match the valve pressure class, operational safety risks may occur. For example, if a low-pressure class valve is mistakenly used in a high-pressure pipeline system, the valve body may experience plastic deformation under water hammer impact. It is also necessary to check the condition of the ball surface and sealing rings. If there are scratches on the ball surface, sealing performance will be reduced. This is especially critical in gas transmission systems where micro-leakage is more likely. 2. Installation Direction Large diameter ball valves usually have a flow direction marking. If the installation direction is incorrect, the following problems may occur: If the fluid flow direction matches the design direction, the operating torque will remain more stable. If the valve is installed in reverse, the stem may experience increased mechanical load, which will accelerate stem wear during long-term operation. For double-seal bidirectional ball valves, although bidirectional flow is allowed, installation according to the marked flow direction is still recommended to ensure more uniform sealing stress distribution. In high-temperature or steam systems, if the installation direction is incorrect, thermal expansion may accelerate sealing ring aging. 3. Pipeline Stress Control Large diameter ball valves are heavy. If installed without proper support, additional bending moments may be transferred to flange connections. If pipeline systems experience axial displacement, pipeline supports should be installed for segmented fixation. If support structures are not provided, the valve body may bear long-term gravitational tensile load, eventually causing flange seal failure. It is generally recommended to install independent supports on both sides of large diameter ball valves. If the pipeline system is subject to thermal expansion and contraction, expansion compensation devices must be installed; otherwise, sealing surfaces may gradually fail. 4. Bolt Tightening Process Flange connections of large diameter ball valves usually ...
This year’s Dervos annual conference was noticeably more grand and well-organized than in previous years. In the morning session, each department delivered its annual work summary, reviewing key projects and achievements over the past year. Teams also openly shared the challenges encountered during implementation and the practical experience gained along the way. Through this cross-department exchange, everyone developed a clearer understanding of one another’s responsibilities and workflows, laying a stronger foundation for future collaboration and communication. In the afternoon session, the Outstanding Employee awards were presented. Each nominee shared their work achievements and practical experience, demonstrating a strong sense of responsibility and execution across different roles. It is precisely this proactive mindset, collaborative spirit, and down-to-earth working approach of Dervos employees that drives the team steadily toward its shared goals. Showing up on time every single day throughout the year — that’s quite an achievement. Ian has now received the Perfect Attendance Award for two consecutive years. During the annual conference, Dervos also presented medals and exclusive commemorative gifts to employees who have completed five years of service. Dervos values the long-term dedication and consistent commitment of its team members, and sincerely appreciates the trust and contributions they have made over the years. For many at Dervos, the company is not only a platform for professional growth, but also a stage where shared goals and collective efforts come to life. In the evening, the annual conference transitioned into the banquet segment. Performances and interactive games were seamlessly interspersed, creating a relaxed yet organized atmosphere. Laughter and cheers echoed throughout the venue, and in the moment the camera shutter clicked, the excitement and joy were captured in a single frame. Eric said: "Let’s dream together, DERVOS's dream. A dream where we all play a part, piece by piece, it becomes a reality." For Dervos, the annual meeting is not just about "summarizing the year," but about bringing our hearts together, strengthening our resolve in doing the same thing, and then continuing to move forward, step by step, with steady progress.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
A351 CF8+STLMethod of Operation:
noDN100 PN16 Stainless Steel Gate Valve is made according to DIN 3352 standard. The valve body is made of A351 CF8M+STL. It has the structural characteristics of Bolted Bonnet, Rising Stem, Flexible Wedge, Face-to-Face Dimensions per DIN 3202-F4. Its connection mode is RF. And it has handle operation mode.
|
Type |
Stainless Steel Gate Valve |
|
Size |
DN100 |
|
Pressure |
PN16 |
|
Connection |
RF |
|
Operation |
Handle |
|
Body Material |
A351 CF8M+STL |
|
Design Norm |
DIN 3350 |
|
Face to Face |
DIN 3202-F4 |
|
Flange dimension |
EN 1092-1 |
|
Test & Inspection Code |
EN 12266 |
|
Temperature |
-29 ~ 425°C |
|
Applicable Medium |
Water, Oil and Gas |
1.Rising stem Stainless Steel Gate Valve design ensures precise flow control and tight shut-off.
2.Rated PN16 with RF flange and DIN 3352 compliance, operated by handle for easy manual control.
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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.
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.
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.
DN100 PN40 5A Duplex Stainless Steel Gate Valve is made according to EN 1984 standard. The valve body is made of ASTM A995 5A+STL. It has the structural characteristics of Full Bore, Bolted Bonnet, Rising Stem with Yoke, Flexible Wedge. Its connection mode is EN1092-1 B1. And it has hand wheel operation mode.
DN100 PN40 Stainless Steel Gate Valve is made according to EN 1984 standard. The valve body is made of X6CrNiMoTi17-12-2. EN 1.4571 (AISI 316Ti) is widely used in medium- to high-temperature applications where resistance to intergranular corrosion and moderate chloride corrosion is required, especially in welded systems without post-weld heat treatment. Its connection mode is EN558. And it has Hand Wheel operation mode. Product Parameters Type Stainless Steel Gate Valve Size DN100 Pressure PN40 Connection EN 558 Operation Hand Wheel Body Material X6CrNiMoTi17-12-2 Design Norm EN 1984 Face to Face dimension EN 1092 End connection EN 558 Test & Inspection Code EN 12266-1,2 Temperature -29 ~ 425°C Applicable Medium Water, Oil and Gas Features 1.Made from EN 1.4571 stainless steel, offering excellent corrosion resistance and high-temperature stability for PN40 pressure applications. 2.Gate valve design compliant with EN 1984 ensures reliable shutoff and long service life in industrial piping systems. Technical Drawing Dimension Checking Pressure Testing Spectrum Nameplate & Packing
DN150 PN40 Stainless Steel Gate Valve is made according to EN 1984 standard. The valve body is made of X6CrNiMoTi17-12-2. EN 1.4571 (AISI 316Ti) is widely used in medium- to high-temperature applications where resistance to intergranular corrosion and moderate chloride corrosion is required, especially in welded systems without post-weld heat treatment. Its connection mode is EN558. And it has Hand Wheel operation mode. Product Parameters Type Stainless Steel Gate Valve Size DN150 Pressure PN40 Connection EN 558 Operation Hand Wheel Body Material X6CrNiMoTi17-12-2 Design Norm EN 1984 Face to Face dimension EN 1092 End connection EN 558 Test & Inspection Code EN 12266-1,2 Temperature -29 ~ 425°C Applicable Medium Water, Oil and Gas Features 1.EN 1.4571 stainless steel construction provides strong resistance to pitting and stress corrosion in aggressive media. 2.DN150 PN40 configuration designed to EN 1984 standard ensures stable operation and tight isolation in medium-pressure pipelines. Technical Drawing Dimension Checking Pressure Testing Spectrum Nameplate & Packing
DN25 PN40 Flange Gate Valve is made according to API602 standard. The valve body is made of A182-F316Ti. Its connection mode is EN1092-1 B1. And it has Hand Wheel operation mode. Product Parameters Type Stainless Steel Gate Valve Size DN25 Pressure PN40 Connection EN1092-1 B1 Operation Hand Wheel Body Material A182-F316Ti Design Norm API 602 Flange dimension EN 1092 Material conform AISI/ASTM Test & Inspection Code EN 12266 Temperature -29 ~ 120°C Applicable Medium Water, Oil and Gas Features 1.F316Ti stainless steel body provides enhanced resistance to intergranular corrosion and elevated-temperature service. 2.DN25 PN40 gate valve designed to API 602 with EN1092-1 B1 flange ensures stable operation and tight isolation in process pipelines. Technical Drawing Dimension Checking Pressure Testing Spectrum Inspection Report
14" 150LB butterfly valve is made according to API 609 standard. The valve body is made of WCB. It has the structural characteristics of double eccentric and high performance. Its connection mode is lug type. And it has turbine with locking device operation mode.
DN50 PN40 check valve is made according to API 594 standard. The valve body is made of A105. It has the structural characteristics of dual plate and wafer type. Its connection mode is wafer.
The 3 way plug valve is made of WCB body and stainless steel trim as per API 599. The plug valve that could connect any two ports together is applicable for natural gas service, water, oil and so on. Quick Detail Type Plug Valve Size 4'' DesignPressure 150LB Construction Three Way Type Plug Valve ConnectionType Flange Connection Operation Lever/Wrench Design Code API 599 Face to Face ASME B16.10 End Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material A216 WCB TemperatureRange -29℃~+425℃ Application WOG Related Knowledge What are types of plug valves? Lubricated Plug Valve The plug gets lubricated by injecting sealant through injection fitting. The lubricant make sure the smooth movement and prevent the corrosion of plug. Usually, the seat of lubricated plug valve is metal, thus they can withstand higher temperature, available in larger size and higher pressure. Non-Lubricated Plug Valve A non-metallic sleeve or liner is installed in the body cavity of the plug valve. This sleeve reduce the fricion beween plug and body. Meanwhile it prevents the corrosion of plug. Due to non-metallice sleeve, the non-lubricated plug valve cannot be used in high temperature condition. Multiway Plug Valve The multiway plug valve is used for diverting flow in transfer lines. The multiway plug valves we often see are 3 way plug valve or 4 way plug valve. Dervos Packaging Based on sufficient experience, we have developed complete packing specifications and procedures to ensure clear and safe transportation so that you can receive good and sound products. And this is also an important factor that we earn good reputation from our customers.
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