Ball valves are widely used industrial flow control components, commonly found in applications such as water treatment, oil and gas, chemical processing, HVAC systems, and the food and pharmaceutical industries. Thanks to their compact structure, quick shut-off capability, and excellent sealing performance, ball valves play a critical role in various fluid systems. However, even the most reliable ball valve can encounter failures after prolonged operation. When a ball valve fails, it can compromise the stability of the entire system and, in severe cases, lead to media leakage or even safety incidents. Therefore, understanding the root causes of ball valve failure and implementing effective preventive measures is essential for engineers and maintenance personnel. 1. Seal Failure Cause: Seal failure in ball valves is often caused by seat wear, debris accumulation, or aging of sealing materials. This issue is especially common in high-temperature, high-pressure, or corrosive media environments. Prevention Tips: To extend the service life of the seal, choose ball valves with PTFE or metal seats that are compatible with the process media. Regularly clean the seat area and establish a replacement schedule based on the operating conditions. 2. Corrosion or Scratches on the Ball Surface Cause: When a ball valve is used with media containing acids, alkalis, high salt content, or abrasive particles, improper material selection can lead to corrosion, pitting, or surface scratches. These issues reduce sealing performance and affect smooth operation. Prevention Tips: Select stainless steel ball valves (such as 304 or 316 grades) or special alloy ball valves based on the specific media characteristics. Additionally, install a strainer or filter to minimize solid particle intrusion and protect the valve internals. 3. Stem Breakage or Seizure Cause: The valve stem, which transmits torque to the ball, may experience metal fatigue and fracture under frequent operation or excessive torque. Seizure can also occur due to bearing wear or lack of lubrication. In some low-quality ball valves, insufficient structural design margin further increases the risk of stem failure. Prevention Tips: Use ball valves with blow-out proof stem designs to enhance operational safety. Ensure that operating torque stays within the valve’s rated limits, and apply lubricant regularly to reduce friction and wear, extending service life. 4. Improper Installation or Operation Cause: Human errors such as incorrect installation direction, loose flange connections, or frequent forceful operation are major contributors to early ball valve failure. In the case of electric or pneumatic ball valves, signal control errors can also lead to misoperation or valve jamming. Prevention Tips: Always follow the manufacturer’s installation guidelines, ensure proper alignment and secure flange connections. Install limit switches and torque protection devices to safeguard...
In industrial pipeline systems, the wafer check valve plays a key role in preventing backflow and is widely used in various fluid control systems. It is favored by many engineers and designers for its compact, lightweight, and easy-to-install characteristics. In practical applications, many consider installing the wafer check valve vertically to accommodate different pipeline layouts and space requirements. So, can wafer check valves be installed vertically? If so, how can their performance and safety be ensured? This article will explore the feasibility of vertical installation of wafer check valves and share some installation guidelines and precautions. 1. Working Principle and Application Scope of Wafer Check Valves A wafer check valve is an automatically opening and closing valve primarily used to prevent backflow of fluids. The valve disc is pushed open when the fluid flows in the forward direction, and it closes by gravity or spring action when the fluid stops or reverses. Unlike traditional swing check valves, wafer check valves typically feature a more compact design, allowing them to be directly sandwiched between pipeline flanges, saving installation space. In typical pipeline systems, the most common installation method for wafer check valves is horizontal installation, as this configuration is the most stable and convenient for maintenance. However, in certain special installation environments, such as tight spaces or specific operating conditions, vertical installation can also be a viable option. 2. Can Wafer Check Valves Be Installed Vertically? In theory, vertical installation of a wafer check valve is feasible, but several important factors should be considered: · Gravity Effect on the Valve Disc The design of the wafer check valve relies on the gravity of the valve disc to close the valve. In horizontal installation, the valve disc naturally falls to ensure a proper seal. However, in a vertical installation, the valve disc may not close naturally due to gravity, especially in upward flow situations. Therefore, it is crucial to ensure that the design of the valve disc and the configuration of the spring are suitable for vertical installation, allowing the valve to close effectively without external interference. · Fluid Flow Direction The direction of fluid flow in a wafer check valve directly impacts its performance. When installed vertically, the flow direction may change, potentially leading to unstable opening or closing of the valve disc. To ensure that the valve disc closes at the right time, it is recommended to check whether the valve has a reliable anti-backflow design, ensuring it can function properly even in vertical installation. · Installation Space and Maintenance Accessibility Vertical installation of a wafer check valve may require more space, particularly if there is a need to maintain a certain distance from other equipment in the pipeline system to allow ...
A ball valve is a widely used flow control valve in industrial pipeline systems. With its simple structure, excellent sealing performance, and easy operation, it plays a crucial role across various industries. 1. Basic Functions Ball valves are rotary-type valves that control fluid flow by rotating a spherical closure element 90 degrees. Their primary functions include: (1) Shut-off and On/Off Control Provides quick opening and closing, making it suitable for pipeline systems requiring frequent operation. (2) Flow Regulation Certain specially designed ball valves allow flow adjustment to accommodate different operating conditions. (3) Bi-directional Sealing Ensures reliable sealing in both flow directions, enhancing pipeline system safety. (4) Emergency Shut-off Some ball valves are equipped with actuators for emergency shut-off, improving overall system safety. 2. Key Features Due to their unique structure and material selection, ball valves offer the following advantages: (1) Excellent Sealing Performance Utilizes soft seals (PTFE, rubber) or metal seals to ensure zero leakage. (2) High Pressure and Temperature Resistance Capable of withstanding high pressures (up to Class 2500) and extreme temperatures (some metal-seated ball valves can operate above 500°C). (3) Easy Operation Available with manual handles, gear operators, electric, or pneumatic actuators to meet various automation requirements. (4) Long Service Life Minimal friction during operation, making it suitable for frequent and long-term use. 3. Typical Applications Due to their versatility, ball valves play a critical role across various industries, including: (1) Oil & Gas Industry Used in transmission pipelines, distribution systems, and storage facilities, ball valves provide reliable control over high-pressure and high-temperature media, ensuring leak prevention and system safety. (2) Chemical & Pharmaceutical Industry Commonly employed for handling corrosive media such as acids, alkalis, and solvents. The use of corrosion-resistant materials (e.g., stainless steel, Hastelloy, PTFE lining) extends service life and enhances reliability. (3) Water Treatment & Environmental Protection In wastewater treatment, seawater desalination, and municipal water supply networks, ball valves regulate and isolate flow, ensuring stable and secure fluid transportation. (4) Power & Energy Sector Ball valves are used for precise control of steam, cooling water, and fuel flow in boiler systems, condensate recovery, and gas transmission, improving energy efficiency and operational safety. (5) Marine & Offshore Engineering Applied in offshore oil platforms and shipboard piping systems, ball valves control seawater, fuel, and ballast water while meeting stringent corrosion resistance requirements in harsh marine environments.
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.
Payment:
30% when order confirmed, 70% before shipmentProduct Origin:
ChinaColor:
CustomizationShipping Port:
Shanghai, ChinaLead Time:
30~60 days Ex Works after order confirmationMaterial:
1.4408Method of Operation:
Hand Wheel OperationProduct Description
|
Type |
Gate Valve |
|
Size |
DN125 |
|
Pressure |
PN16 |
|
Connection |
RF EN1092-1 B1 |
|
Operation |
Hand Wheel Operation |
|
Body Material |
1.4408 |
|
Design Norm |
DIN 3352 |
|
Face to Face Dimension |
DIN3202-F5 |
|
Flange Dimension |
EN1092-1/B1 |
|
Test & Inspection Code |
EN12266-1/2 |
|
Temperature |
-29 ~ 150°C |
|
Applicable Medium |
Water, Oil and Gas |
Features
1. Long service life, wide application range, and labor-saving opening and closing;
2. There are many available materials and strong manufacturing craftsmanship.
3. Due to its simple structure and short structural length, its production cost performance is high.
Technical Drawing
Dimension Checking
Pressure Testing
Nameplate & Packing
Inspection report
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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.
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.
Globe valve with a non-return design, preventing reverse flow when in the open position, also suitable for isolation duty. Manually operated, supplied with a handwheel.
The Class 300 flanged ball valve has cast steel WCB body, stainless steel ball, stem, seat ring along with Devlon seat insert. We also supply more types of trunnion mounted ball valve, accept customized. Design Feature 1.Firesafe design as per API 607 2.With sealant injection for self lubricating 3.With antistatic design 4.With anti-blowout stem 5.With vent and drain port 6.Full bore design 7.Three-piece type and trunnion ball 8.Gear operated for easy operation Quick Detail Type Ball Valve Size 24" Pressure ANSI 300 Construction Trunnion Type Ball, 3-Piece Body, Side Entry, Full Bore Connection Flange Connection Operation Gearbox Operation Body Material ASTM A216 WCB Design Code API 6D Pressure & Temp Code ASME B16.34 Face to Face ASME B16.10 End Connection ASME B16.5 Test & Inspection Code API 598, API 6D Fire Safe API 607 Temperature Range -29℃~+200℃ Medium WOG Origin China Dimension CLASS 300 DN mm 50 65 80 100 150 200 250 300 350 400 450 500 600 700 NPS in 2 2.5 3 4 6 8 10 12 14 16 18 20 24 28 L (RF) mm 216 241 283 305 403 502 568 648 762 838 914 991 1143 1346 in 8.5 9.5 11.13 12 15.88 19.75 22.38 25.5 30 33 36 39 45 53 L1 (BW) mm 216 241 283 305 457 521 559 635 762 838 914 991 1143 1346 in 8.5 9.5 11.13 12 18 20.5 22 25 30 33 36 39 45 53 L2 (RTJ) mm 232 257 298 321 419 518 584 664 778 854 930 1010 1165 1372 in 9.13 10.13 11.75 12.63 16.5 20.38 23 26.13 30.63 33.63 36.63 39.75 45.89 54 H mm 153 165 195 213 272 342 495 580 625 720 790 840 1050 1150 in 6.02 6.5 7.68 8.39 10.7 13.5 19.5 22.85 24.6 28.35 31 33.1 41.34 45.3 Do(W) mm 400 400 600 850 1100 1500 *350 *350 *600 *600 *800 *800 *800 *800 in 15.74 15.74 23.62 33.46 43.3 59 13.8 13.8 23.6 23.6 31.5 31.5 31.5 31.5 RF(Kg) 18 27 47 80 118 200 365 530 740 1030 1320 1540 2600 3900 BW(Kg) 14 2 38 65 105 185 342 503 713 1000 1285 1498 2540 3825 *Worm Gear or Electric Actuator Operated Dervos Quality Checking System In Dervos, we control quality throughout the whole manufacturing process. Casting inspection: Though casting inspection, we can find out the problem of raw material, such as shoddy casting, unqualified wall thickness, chemical composition and so on, which ensure that you will not be cheated. Machining Inspection: On the one hand, we could ensure machining accuracy through this process. On the other hand, we can find out machining mistake as early as possible, to win more time for repairing and remaking Final Inspection: Final inspection activities include document and QC record review, visual examination, dimension check, pressure test, painting and packing check. You don’t need to come and inspect in person and all the documents could be provided as proof.
The 1 inch sleeved type plug valve is made of A216 WCB as per API 599. Thanks to its PTFE seat, the valve has excellent sealing and anti-corrosion performance. The valve is capable in working condition lower than 180 degree.
2" 150LB butterfly valve is made according to API609 standard. The valve body is made of CF8. It has the structural characteristics of high performance and double eccentric. Its connection mode is wafer. And it has bare stem with bracket operation mode.
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.
The 12 inch high pressure check valve is designed with pressure seal bonnet, RTJ flange, tilting disc, made of carbon steel WCB body and hard face sealing. Quick Detail Type Check Valve Size 12'' DesignPressure 2500LB Construction Pressure Seal Bonnet, Tilting Disc Type Connection RTJ Flange Design & Manufacture ASME B16.34 End to End ASME B16.10 Connection ASME B16.5 Pressure & Temp ASME B16.34 Test & Inspection API 598 Body Material A216 WCB Trim Material 13CR+STL Temp Range -29℃~+350℃ Media W.O.G. Product Range Body Material Range: WCB, WCC, WC1,CF8M, CF8, CF3, CF3M, LCB, LCC Size Range: 2”~60” (DN50~DN1500) End Connection Type: Flange End, Weld End Design Pressure Range: 150lbs~600lbs Temp Range: -46℃~ +425℃ Related Knowledge What is a tilting disc check valve? The disc of a tilting disc check valve has a pivot point at the center of it. It is desinged to overcome weaknesses of general type swing check valve. Compared to swing type check valve, the tilting check valve could remain fully open and steady at lower flow rates. That is to say, the swing check valve needs a high velocity of fluid to keep disc open and a higher cracking pressure. For low pressure situation, the pressure drop of a tilting disc check valve is much lower than the swing type. But at a higher flow rate, the tilting check valve has higher pressure drop than swing type.
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
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.
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