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...
In 2025, Dervos organized its annual team trip, a five-day journey to Chongzuo, Weizhou Island, and Nanning in Guangxi Province. The trip aimed to provide relaxation and strengthen team communication, offering a well-paced and content-rich experience that combined natural landscapes with local cultural immersion. In Chongzuo, the team focused on nature sightseeing. Bamboo rafting tours allowed close observation of the local ecology and offered opportunities to see rare species such as the white-headed leaf monkey. The group also visited Detian Waterfall, experiencing its scale and flow firsthand. The overall itinerary was designed with a relaxed pace, providing ample time for rest and team bonding. Next, the team traveled to Weizhou Island. The volcanic landforms and coastal scenery added a unique visual dimension to the journey. Beyond sightseeing, participants engaged in local agricultural activities, including dragon fruit picking and banana harvesting, gaining insight into local lifestyles. The team also visited several beaches, fully appreciating the island environment. The final stop was Nanning. Team members explored the night market, sampled local specialties, and experienced the city’s daily life, bringing the Guangxi trip to a relaxed conclusion. This annual trip allowed the Dervos team to foster more natural communication and connection outside of work, recharging energy for the months ahead. Dervos remains committed to its guiding principle: I come, I see, I conquer!
These symptoms typically indicate a mismatch in fluid conditions, valve selection, or system configuration. If left unaddressed over prolonged operation, they can accelerate valve wear and pose safety risks. Based on field experience, this article outlines the common causes of valve vibration and noise and provides practical guidance for troubleshooting. 1. Basic Manifestations of Valve Vibration and Noise Valve vibration usually appears as noticeable oscillations of the valve body, stem, or connected piping. Noise may present as humming, whistling, or banging sounds. These phenomena often occur simultaneously and are primarily related to the following factors: ● Abnormal flow velocity or pressure differential ● Unstable internal forces within the valve ● Mismatch between actual operating conditions and valve design 2. Common Causes Analysis 1. Excessive Flow Velocity or Pressure Differential When the fluid passes through the throttling section of a valve at high speed, strong turbulence and pressure fluctuations are likely to occur, causing periodic impact on internal components. This issue is particularly pronounced when using standard globe valves or ball valves under regulating conditions. Typical manifestations include: ● Noise increases as the valve opening decreases ● Vibration intensifies under high-pressure-drop conditions 2. Improper Valve Selection Incorrect valve selection is a common root cause of vibration, such as: ● Using on/off valves for prolonged throttling ● Oversized valve operating at small openings for extended periods ● Insufficient pressure rating or structural rigidity of the valve These conditions can cause unstable movement of the valve plug or ball, resulting in vibration and noise. 3. Loose or Worn Internal Components After long-term operation, the following issues are commonly observed: ● Wear of valve plugs or discs ● Increased clearance between the stem and guiding parts ● Loosened fasteners Non-design clearances amplify fluid impact, leading to persistent noise. If vibration is accompanied by metallic knocking sounds, the condition of internal components should be checked as a priority. 4. Cavitation or Flashing In liquid service, cavitation or flashing occurs when local pressure drops below the saturation vapor pressure. Bubble collapse in high-pressure regions impacts internal components, often accompanied by noise and vibration. Typical signs include: ● Sand- or gravel-like scraping sounds ● Rapid wear of internal components ● Significant pressure fluctuations 5. Insufficient Piping Support or System Resonance Some vibrations are not directly caused by the valve. When upstream or downstream piping lacks adequate support, or when the piping structure resonates near the fluid pulsation frequency, system resonance may occur, amplifying existing vibrations...
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.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
chinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
A105N+STL
|
Type |
Y-Globe Valve |
|
Size |
2” |
|
Pressure |
1500LB |
|
Connection |
SW |
|
Body Material |
A105N+STL |
|
Design Norm |
API602 |
|
Socket Welded Dimension |
ASME B16.11 |
|
Materials Conform |
AISI/ASTM |
|
Test & Inspection Code |
API 598 |
|
Temperature |
-29 ~ 425°C |
|
Applicable Medium |
Water, Oil and Gas |
1.Forged from A105N carbon steel, offering excellent strength and reliability for high-pressure 1500LB applications.
2.Y-pattern globe valve design compliant with API 602 provides smooth flow, reduced pressure loss, and convenient manual operation with handle control.
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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
Quick 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.
The 6 inch sleeved plug valve features in non lubricated design and soft seat. The full port plug valve is made of carbon steel body and PTFE seat as per API 6D, with Class 150 flange connection. Quick Detail Type Plug Valve Size 6'' Design Pressure 150LB Construction Self-Lubricated Type, Sleeved Type, Soft Seat Connection Type RF Flange Operation Gearbox Operation 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 Temperature Range -29℃~+425℃ Application Water, Oil, Gas Material & Dimension No Part Name Carbon steel to ASTM Stainless steel to ASTM WCB LCB CF8 CF8M CF3 CF3M 1 Body A216 WCB A350 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 2 Bonnet A216 WCB A350 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 3 Plug A105 A182 F304 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 4 Stem A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 5 Seat Ring PTFE 6 Gasket PTFE or Stainless Steel and Graphite 7 Stem Seat PTFE PTFE PTFE PTFE PTFE PTFE 8 Small spring 17-17PH 9 Small ball A182 F304 or A182 F316 10 Gland A182 F6 A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 11 Gland Flange A216 WCB A350 LCB A351 CF8 A351 CF8M A351 CF3 A351 CF3M 12 Stem packing PTFE or Graphite 13 Bonnet bolt A193 B7 or A320 L7 or A320 B8 or A193 B8M 14 Bonnet nut A194 2H or A194 4 or A194 8 Class 150 DN mm 15 20 25 40 50 65 80 100 150 200 250 300 NPS in 1/2 3/4 1 1 1/2 2 2 1/2 3 4 6 8 10 12 L(RF) mm 108 117 127 165 178 191 203 229 394 457 533 610 in 4.25 4.6 5 6.5 7 7.5 8 9 15.5 18 21 24 L1(BW) mm 140 152 165 190 216 241 283 305 457 521 559 635 in 5.5 6 6.5 7.48 8.5 9.5 11.13 12 18 20.5 22 25 L2(RTJ) mm 119 129.7 139.7 178 191 203 216 241 406 470 546 622 in 4.69 5.11 5.5 6.9 7.5 8 8.5 905 16 18.5 21.5 24.5 H mm 59 63 75 92 153 165 195 213 272 342 495 580 in 2.3 2.5 2.95 3.74 6.02 6.5 7.68 8.39 10.7 13.5 19.5 22.85 D(W) mm 130 130 160 230 400 400 600 850 1100 1500 350* 350* in 5.1 5.1 6.3 9 15.74 15.74 23.62 33.46 43.3 59 13.8 13.8 Weight (Kg) RF 2.3 3 4.5 7 15 20 25 40 97 160 240 390 BW 2.0 2.5 3.8 5.8 12 17 21 36 92.8 154 227 365
DN40 PN16 ball float steam trap valve is made according to GB/T22654-2008 standard. The valve body is made of CF8. It has the structural characteristics of ball float type. Its connection mode is RF.
The DN100 3 way ball valve is isolating valve designed to redirect the service fluid flow rather than throttling or regulating purposes. Suitable for water, steam, gas, oil, crude oil, acid, alkali and other liquids and gases without mechanical impurities.
3" 600LB globe valve is made according to BS1873 standard. The valve body is made of ASTM A351 CF8+STL. It has the structural characteristics of bolt cover and straight through type. Its connection mode is RTJ. And it has hand wheel operation mode.
4x3" 150LB floating ball valve is made according to API 6D standard. The valve body is made of A182 F51. It has the structural characteristics of two piece, floating ball, reduced diameter, anti-fire, anti-static, anti-flying valve stem, bidirectional, with locking device. Its connection mode is RF. And it has lever operation mode.
The 8 inch plug valve is designed per API 6D with Class 150 RF flange and gearbox operation. The inverted plug valve is made of LCB. Dervos could offer customizing service by providing clients with valves in different sizes, materials, standards, design pressure, structure, operation type and connection type. Quick Detail Type Plug Valve Size 8'' Design Pressure 600LB Construction Inverted Type, Lubricated Type, Pressure Balanced Connection RF Flange Operation Gearbox Design Code API 6D Face to Face ANSI B16.10 End Connection ANSI B16.5 Test & Inspection API 598 Body Material LCB Temperature Range -46℃~+425℃ Application Water, Oil and Gas Dimension
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 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
12" 300LB gate valve is made according to API600 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of bolt cover, rising stem, elastic gate and full flow. Its connection mode is RF. And it has gearbox operation mode.
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