Wide-body ball valves and single-piece ball valves are both types of ball valves used for controlling the on/off flow of medium in pipelines. Both wide-body and single-piece ball valves feature a one-piece (integral) body design, unlike split-body designs. This differs from two-piece and three-piece ball valves, which have segmented valve bodies. For internally threaded wide-body ball valves, the valve body is made from round or hexagonal stock, using either bar material or forged components. The ball core features a reduced-diameter design and is inserted from one side of the valve body. The stem uses an internal anti-blowout structure. Flat surfaces are machined on both the inlet and outlet sides of the body to facilitate assembly of the ball valve and allow the use of wrenches during pipeline installation. In wide-body ball valves, the stem stuffing box is relatively shallow, and the internal packing volume is limited, resulting in a moderate sealing performance of the stem. Therefore, these valves are more suitable for low-pressure medium applications. In contrast, two-piece and three-piece ball valves feature stem stuffing box structures that provide reliable sealing for high-pressure medium applications. The structure of flanged wide-body ball valves is essentially the same as that of internally threaded wide-body ball valves. Typically, the flange is connected to the intermediate valve body via threaded fasteners, although some designs utilize a forged one-piece structure. Externally threaded wide-body ball valves can use a union-type structure, where the union is directly welded to the pipeline and connects to the external threads on the valve body. This design allows for easy disassembly and reassembly during valve maintenance or replacement without requiring separate unions on the pipeline. The valve bodies of single-piece internally threaded ball valves and single-piece flanged ball valves are manufactured using casting processes, with the ball core featuring a reduced-diameter design. The stem uses an internal anti-blowout structure. The inlet and outlet ends of single-piece internally threaded ball valves have a hexagonal shape, similar to conventional internally threaded valves, to facilitate wrench operation and secure installation. In single-piece flanged ball valves, the flange and valve body are cast as a single unit, eliminating the need to machine and assemble the flange separately as in wide-body flanged ball valves. This approach reduces cost and simplifies the manufacturing process. Single-piece wafer-style ball valves have a shorter valve body length, making them more suitable for pipelines with limited space. Wide-body and single-piece ball valves both use a reduced-diameter ball design, resulting in higher flow resistance compared with two-piece and three-piece ball valves. The main differences are as follows: Valve Body Manufacturing Process ● Wide-bo...
In a wedge gate valve, the gate sealing surfaces are wedge-shaped, forming a specific angle relative to the gate centerline. The gate is driven downward by the valve stem to achieve closure. As the stem thrust increases, the normal force acting on the wedge-shaped sealing surfaces also increases, creating a forced sealing effect. This design significantly improves sealing performance under low-pressure conditions. During opening, the gate sealing surfaces disengage from the seat immediately, which helps reduce wear on the sealing faces and extends the service life of the valve. Applicable Standards for Wedge Gate Valves Wedge gate valves are commonly manufactured in accordance with the following standards: ● GB/T 12234-2019 – Steel gate valves with bolted bonnet for petroleum and natural gas industries ● GB/T 12232-2005 – General-purpose flanged cast iron gate valves ● API Standard 600 (2015) – Steel gate valves for petroleum and natural gas industries Types of Wedge Gate Valve Gates Wedge gate valves are typically available in three gate configurations:Solid wedge gate, Flexible wedge gate, Double wedge gate. The flexible wedge gate and double wedge gate rely on controlled deformation of the sealing surfaces to achieve improved contact with the valve seat. This design enhances sealing reliability and effectively prevents gate binding or jamming caused by temperature variations, ensuring smooth operation even under fluctuating thermal conditions. Parallel Slide Gate Valve Design and Sealing Principle In a parallel slide gate valve, the sealing surfaces at both the inlet and outlet ends of the gate are parallel to the gate centerline. For single-gate configurations, sealing is primarily achieved by the medium pushing a floating gate or floating seat into position. In double-gate configurations, sealing can be accomplished through springs or an expansion mechanism between the gates. Throughout the opening and closing process, the gate and seat sealing surfaces remain in constant contact, ensuring reliable sealing. Applicable Standards for Parallel Slide Gate Valves Common standards for parallel slide gate valves include: ● GB/T 23300-2009 – Parallel slide gate valves ● JB/T 5298-2016 – Steel parallel slide gate valves for pipelines ● API 6D – Pipeline valves for petroleum and natural gas industries Types and Features of Parallel Slide Gate Valves Parallel slide gate valves are available in single-gate and double-gate configurations. ● Gates may include flow-through holes or be solid. Gates with flow-through holes match the seat inner diameter, facilitating cleaning and drainage of the pipeline. ● Sealing can be configured at the inlet end, outlet end, or at both ends, depending on application requirements. This design ensures flexibility in sealing arrangements while maintaining reliable oper...
Damage to valve sealing surfaces is typically the result of multiple contributing factors, including material selection, operating conditions, operating practices, and maintenance. The following is a categorized summary of the most common causes: 1. Mechanical Damage ● Wear: Solid particles in the medium (such as sand or welding slag) erode the sealing surface, resulting in scratches or grooves. ● Abrasive scuffing: Frictional wear caused by relative movement of the sealing surfaces during valve opening and closing, particularly in metal-to-metal sealing pairs. ● Impact damage: Deformation of the sealing surface caused by high-velocity fluid impingement or rapid valve opening and closing, leading to impact loading. 2. Chemical Corrosion ● Media corrosion: Acidic, alkaline, or oxidizing media directly attack the sealing surface material, such as metal corrosion caused by H₂S or chloride ions. ● Electrochemical corrosion: When sealing pairs made of dissimilar metals are exposed to an electrolyte, galvanic corrosion may occur due to electrochemical cell formation. ● Erosion–corrosion: The combined effect of corrosive media and high-velocity flow accelerates material loss on the sealing surface. 3. Thermal Damage ●Thermal fatigue:Frequent temperature fluctuations cause repeated thermal expansion and contraction of the sealing surface, leading to cracking or deformation. ●High-temperature oxidation:At elevated temperatures, the sealing surface may undergo oxidation, hardening, or burn-off, as commonly observed in steam valve applications. ●Thermal shock:Sudden exposure to high- or low-temperature media can cause cracking of the sealing surface, such as during rapid condensation or cold media ingress. 4. Improper Installation and Operation ●Installation misalignment: Incorrect valve installation or excessive piping stress can result in uneven loading on the sealing surfaces. ●Over-tightening: Excessive preload applied to the valve stem or bolting may crush or deform the sealing surface, particularly in soft-seated valves or soft sealing gaskets. ●Rough operation: Rapid opening and closing or excessive operating force can cause impact damage to the sealing surfaces. 5. Material Defects ●Improper material selection: The sealing surface material lacks sufficient resistance to process media, high temperature, or wear, such as the use of carbon steel in acidic service. ●Manufacturing defects: Defects in the hardfacing or overlay layer, including porosity, slag inclusions, or improper heat treatment, reduce wear resistance and overall sealing performance. 6. Abnormal Operating Conditions ●Cavitation / flashing: Pressure fluctuations in the fluid generate vapor bubbles that collapse and impact the sealing surface, a phenomenon commonly observed in valves installed downstream of pumps. ●Scaling / deposition: Impurities in the medium accumulate on the sealing surface, impairing tight shutoff, suc...
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
F11+STLMethod of Operation:
HandwheelQuick Detail
|
Type |
Globe Valve |
|
Designed Size |
3/4 Inch |
|
Designed Pressure |
1500LB |
|
Construction |
Y Type; Bolted Bonnet; |
|
Connection Type |
Socked Weld |
|
Operation |
Handwheel |
|
Design Code |
API602 |
|
Connection |
ANSI B16.11 |
|
Test & Inspection |
API598 |
|
Body Material |
A182 F11+STL |
|
Trim Material |
A276-410+STL |
|
Application |
Water, Oil, Gas |
Features
· Low pressure drop.
· Low torque stroking
· Quick and easy repair in line.
· Tight shutoff.
· Stem expansion/contraction thrust unit for high temperature application (optional).
· Other sizes available on request.
· Live-loading of packing optional.
Technical Drawing
Dimension Check
Witnessing Tests
Packing
Product Application
Dervos valves can be widely used in varieties of industries, such as petrochemical,pipeline,oil & gas,marine,water treatment,power station industries and etc.
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.
Designed with 800 LB sw end, the 2 inch globe valve features in plug disc, bolted bonnet, and y type structure. The handwheel operated globe valve is made of forged steel body and stainless steel trim. Quick Detail Type Globe Valve Size 2'' Pressure ANSI 800 Structure Y Type, Y Pattern, Bolted Bonnet ConnectionType SW Operation Handwheel Operated Design Code API 602 Face to Face ASME B16.10 Connection Standard ASME B16.11 Pressure & Temperature ASME B16.34 Test & Inspection Standard API 598 Body Material ASTM A105 ApplicableTemperature -29℃~+425℃ Application Water, Oil, Gas Related Knowledge What is the main reason to use Y-pattern globe valve? A Y type globe is designed with 45° between seat and stem. In other words, the flow will remain straight linear from inlet to outlet ports.Compared to staight pattern globe valve, the y pattern globe valve reduce the flow resistance and pressure drop. This kind of y pattern globe valve is well suited for high pressures and severe application. FAQ 1. How long have you been in business and how long have you producing valves? We have been in valve exporting industry for more than 10 years since foundation in 2008. Our business has expanded tremendously to five continents all around the world. 2. What are your main products and their advantages? Our main products include gate, globe, check, ball, butterfly, plug valves and strainers, available in different materials, sizes and pressure, which are widely used in various industries. 3. Does Xiamen Dervos Valves Industry Co., Ltd. make products for other companies? Yes, of course. We have a reference list with customer information like country, product type, order volume and some even with project names.
Y type globe valve. CF8 body/bonnet, F304 disc/stem, SS304+flexible graphite gasket and bronze bolt and nut. Plug type disc and Raised face flange connection. Quick Detail Type Globe Valve Size 4 inch DesignPressure CL150 Construction Y Type Globe Valve Connection Type Raised Face Flange Connection Operation Handwheel Design Code ASME B16.34 Face to Face ASME B16.10 Test & Inspection API 598 Body Material CF8 Temperature Range -29~538℃ Application WOG
2" 1500LB Y-Globe Valve is made according to API602 standard. The valve body is made of A105N+STL. This valve features a split body design with Y-type, BB, OS&Y Globe Valve. It connection mode is SW.The valve is operated by Handle.
The 16 inch cast steel gate valve with gearbox and 600LB RF flange is designed as per API 600. The bolted bonnet gate valve features in rising stem, resilient wedge and metal seat. Quick Detail Type Gate Valve Size 16" Pressure Class600 Construction Bolted Bonnet, Rising Stem, OS&Y, Flexible Wedge, Metal Seat Connection RF Flange Operation Gearbox Design Code API 600 Face to Face ASME B16.10 Flange End ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material A216 WCB TrimMaterial Trim 5 Temperature Range -29℃~+425℃ Medium Water, Oil and Gas Origin China Dimension & Material Class 600 NPS in 2 2 1/2 3 4 6 8 10 12 14 16 18 20 24 DN mm 50 65 80 100 150 200 250 300 350 400 450 500 600 L-L1 (RF-BW) in 11.5 13 14 17 22 26 31 33 35 39 43 47 55 mm 292 330 356 432 559 660 787 838 889 991 1092 1194 1397 L2 (RTJ) in 11.625 13.125 14.125 17.125 22.125 26.125 31.125 33.125 35.125 39.125 43.125 47.25 55.375 mm 295 333 359 435 562 664 791 841 892 994 1095 1200 1407 H (OPEN) in 18.625 21.75 23.375 28 1/16 38 3/16 44 3/16 52.375 59 13/16 68.125 72.25 90.125 98 13/16 119 mm 474 553 593 713 970 1122 1330 1519 1730 1835 2290 2510 3022 W in 9.875 9.875 11 13/16 13.75 19 11/16 22 1/16 28.375 24 24 24 24 30 30 mm 250 250 300 350 500 560 720 610* 610* 610* 610* 760* 760* WT (kg) RF 41 58 88 131 253 413 623 784 1288 1820 2150 2540 4080 BW 35 50 68 104 208 328 496 637 1120 1448 1828 2201 3360 *Manual gear operator is recommended No Part Name Carbon steel to ASTM Alloy steel to ASTM Stainless steel to ASTM WCB LCB WC6 WC9 C5 CF8 CF8M CF3 CF3M 1 Body A216 WCB A350 LCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 2 Seat Ring A105 A350 LF2 A182 F11 A182 F22 A182 F5 A182 F304 A182 F316 A182 F304L A182 F316L 3 Wedge A216 WCB A350 LCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 4 Stem A182 F6 A182 F6 A182 F304 A182 F304 A182 F316 A182 F304L A182 F316L 5 Bonnet nut A194 2H A194 4 A194 7 A194 8 6 Bonnet bolt A193 B7 A320 L7 A193 B16 A193 B8 7 Gasket SS Spiral Wound graphite or SS Spiral Wound PTFE 8 Bonnet A216 WCB A352 LCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 9 Backseat bushing A182 F6 A182 F6 A182 F304 A182 F304 A182 F316 A182 F304L A182 F316L 10 Stem packing Graphite or PTFE 11 Lantern A182 F6 A182 F6 A182 F304 A182 F304 A182 F304 A182 F304 A182 F316 A182 F304L A182 F316L 12 Gland Nut A194 2H A194 8 13 Gland Eyebolt A193 B7 A193 B8 14 PIN Carbon steel or Stainless Steel 15 Gland A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 16 Gland Flange A216 WCB A351 CF8 17 Stem Nut A439 D2 or B148-952A 18 Nipple Carbon steel or Stainless Steel 19 Retaining Nut Carbon steel 20 Hand Wheel Ductile Iron or carbon steel 21 Name Plate Stainless steel or Aluminum 22 H.W.Lock Nut Carbon steel
2" 300LB Carbon Steel Y Type Strainer is made according to ASME B16.34 standard. The valve body is made of LCC. It has the structural characteristics of Y Type. Its connection mode is RF. Product Parameters Type Carbon Steel Y Type Strainer Size 2” Pressure 300LB Connection RF Body Material ASTM A352 LCC Design Norm ASME B16.34 Face to Face ASME B16.10 Flange Ends Dimensions ASME B16.5 Test & Inspection Code API 598 Temperature -46~ 350°C Applicable Medium Water, Oil and Gas Features 1.Carbon steel body designed to ASME B16.34, providing high strength and reliable performance under Class 300 pressure. 2.Y-type strainer with RF flanged ends ensures efficient particle filtration and easy installation in industrial piping systems. Technical Drawing Dimension Checking Pressure Testing Nameplate & Packing Inspection Report
6" 1500LB throttle valve is made according to ASME B16.34 standard. The valve body is made of LF2. It has the structural characteristics of angular, full flow and body cover bolted. Its connection mode is RTJ. And it has hand wheel operation mode.
DN100 PN64 wafer check valve is made according to API 594 standard. The valve body is made of A351 CF8M. It has the structural characteristics of wafer type and double disc. Its connection mode is wafer type.
80A JIS 10K three-way plug valve is made according to API 599 standard. The valve body is made of A351 CF8. It has the structural characteristics of 3-way and L-shaped. Its connection mode is RF.
The 8 inch 150 LB dual disc non return check valve, designed per API 594, has dual plate and lug connection. The retainerless dual plate check valve is made of duplex stainless steel 4A as its body and trim material. Quick Detail Type Check Valve Size 8'' DesignPressure Class 150 Construction Dual Plate Type, Retainerless Connection Lug Type Design & Manufacture API 594 End to End ASME B16.10 Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material Duplex Stainless Steel 4A Trim Material Duplex Stainless Steel Media W.O.G. Design Feature 1.Shor face to face dimension 2.Small in size with light weight 3.Swift close of disc with small water hammer 4.Vertically or horizontally installed 5.Smooth flow passway with small flow resistance 6.Long cycle life and high reliability
1" 1000PSI floating ball valve is made according to API 608 standard. The valve body is made of A182 F316. It has the structural characteristics of 2-piece and floating ball type. Its connection mode is NPT (ASME B1.20.1). And it has lever operation mode.
The double- disc check valve, made of CF8 stainless steel, has excellent resistance to corrosion. Designed in accordance with DIN 3202, the check valve is about to connect to pipes with WAFER. Quick Detail Type Check Valve Nominal Diameter DN100 NominalPressure PN25 Construction Double disc/ Dual Plate Connection Wafer Type Design & Manufacture DIN 3202 End to End DIN 3202 Flange End Dimension DIN 2401 Test & Inspection API 598 Temperature Range -29℃~+425℃ Body Material A351 CF8 Wedge Material A351 CF8 Media W.O.G. Dervos Packaging Good packing means good first impression. Just imagine how do you feel differently when seeing two boxes below? And you will know the reason why in Dervos we value packaging so much. In Dervos, we make sure- 1. Every valve isclean and dry. What do we do? -Clean the valve before packing -Add anti-rust oil -Add flange cover 2. No damageto valves in delivery. How do we achieve this? -Fix the valve with iron wire -Separate the valve with soft material -Layer the valve with plywood 3. Strong box and clear shipping mark
DN80 PN10 Air Release valve is made according to CJ/T217-2005 standard. The valve body is made of QT450. Its connection mode is EN1092-1.
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