In any efficient and reliable lubrication system, oil cleanliness is a core factor affecting equipment lifespan and operational efficiency. Strainers, as the front-line filtration devices in lubrication systems, play a critical role in pre-filtration. However, engineers and operators often raise the following questions: Can oil pass through strainers smoothly? What exactly is the function of a strainer? How does it differ from subsequent fine filters? This article systematically explains the role of strainers in lubrication systems, covering their working principles, pre-filtration objectives, and practical applications across different systems. 1. Can Oil Pass Through a Strainer? Answer: Yes, but with limitations. (1) Strainer Structure Allows Oil Flow A strainer is fundamentally a low-precision filter made of stainless steel mesh or perforated metal plates. It features uniform pores, typically sized between 80–500 μm (micrometers), allowing most clean oil to flow through unimpeded. (2) Contaminants Are Blocked Particles such as metal shavings, seal fragments, and carbon deposits in the oil are intercepted by the strainer, preventing them from entering the oil pump or other critical components. (3) Oil Temperature and Viscosity Affect Flow Efficiency Low temperatures or high-viscosity oil may reduce flow rates or even cause blockages. This is one reason for low oil pressure during system startup. 2. Objectives and Significance of Pre-Filtration (1) Protecting the Oil Pump Internal pump components (gears, impellers, or plungers) are highly sensitive to solid particles. Pre-filtration prevents particles from entering the pump, avoiding premature wear or seizure. (2) Reducing Load on Primary Filters By intercepting large contaminants, strainers allow primary filters (e.g., oil filter cartridges) to focus on finer impurities, extending their service life and maintaining stable system flow. (3) Lowering System Failure Rates Pre-filtration reduces risks such as pump failure, orifice blockages, and lubrication breakdown caused by foreign particles, enhancing overall system reliability. 3. Typical Applications of Pre-Filtration Devices Application System Strainer Installation Position Strainer Type Internal Combustion Engine Lubrication Oil sump → Pump inlet Coarse metal strainer Hydraulic Systems Tank outlet → Pump suction port Suction strainer or basket strainer Turbine Lubrication Systems Pump inlet Dual-chamber switchable suction strainer Transmission/Clutch Systems Oil sump → Circulation pump inlet Perforated plate + magnetic strainer 4. Design and Usage Considerations for Strainers (1) Pore Size Selection Must Align with System Precision Requirements 80–100 μm: Typical for engine oil systems. 150–300 μm: Used in hydraulic equipment. >400 μm: Suitable for low-pressure or open-loop systems. (2...
Ball valves, with their simple structure, easy operation, and excellent sealing performance, have become widely used control components in both industrial and residential sectors. Particularly in water supply systems, an increasing number of engineers and installers are choosing ball valves as the primary fluid control device. But are ball valves truly suitable for water systems? How should one properly select and install them to ensure long-term stable operation? This article provides a comprehensive overview from the perspectives of structural principles, performance characteristics, and application recommendations. 1. Advantages of Ball Valves in Water Systems (1) Quick Opening and Closing Ball valves can complete the opening and closing operation with a simple 90° rotation, making them easy to operate and highly responsive—ideal for emergency situations or water systems that require frequent switching. (2) Excellent Sealing Performance High-quality ball valves are equipped with PTFE or reinforced sealing materials, enabling zero leakage. They are particularly suitable for water supply systems in residential buildings, commercial complexes, and industrial facilities where sealing performance is critical. (3) Compact Structure and Space-Saving Compared to gate valves or globe valves, ball valves occupy less space and offer flexible installation, making them ideal for water modules with high equipment integration. (4) Strong Corrosion Resistance Ball valves made of stainless steel, brass, or plastic materials (such as UPVC) offer excellent corrosion resistance, capable of handling various water qualities (soft water, hard water, reclaimed water) and different additives. 2. Application Scenarios Analysis Ball valves are suitable for the following types of water systems: (1) Domestic Water Systems: Such as internal building water supply, point-of-use control for sanitary fixtures, and garden irrigation systems. (2) Industrial Water Systems: Such as cooling water circulation systems, boiler feedwater systems, and water supply for cleaning equipment. (3) Water Treatment Systems: Including reverse osmosis pretreatment, greywater recycling, and wastewater transfer processes. (4) Special Applications: High-pressure hot water systems or cleaning water containing chemical additives. However, caution should be exercised in the following scenarios: (1) High-Frequency Modulation Conditions Standard ball valves are not suitable for precise flow regulation. It is recommended to use V-port ball valves or control-type electric ball valves. (2) Water Containing Sand, Gravel, or High Levels of Suspended Solids A Y-strainer should be installed to prevent particle blockage or damage to the sealing surfaces. (3) High-Temperature Hot Water Systems High-temperature ball valves with metal sealing structures should be selected to prevent seal aging and deformation. 3. Key Selection Criteria To ensure stable operation o...
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 2017, DERVOS contributed to an innovative environmental initiative led by ECOFUEL, an emerging canadian player in clean technology. This groundbreaking project aimed to produce sustainable diesel from solid waste, setting a precedent in green energy solutions. DERVOS is proud to have provided 136 sets of premium valves to support this pioneering effort.
DERVOS’s Contribution
DERVOS supplied a diverse range of high performance valves, including:
Segment Ball Control Valves: Renowned for their exceptional regulating performance, these V-type ball valves deliver precise control and are particularly suited for media containing fibers, solid particles, and slurry. The unique design featuring a V-shaped slit and metal seat enhances both cut-off and flow regulation capabilities.
Knife Gate Valves: Ideal for handling mediums with wooden debris and slurry, these valves offer excellent cut-down performance, ensuring reliable operation in challenging conditions.
Three-Way Split Flow Valves: Remotely controlled by electric actuators, these valves enable the flow to be split into two streams, providing precise control over process parameters.
Safety Valves: Customized to meet API 520 and API 526 standards, these valves are tailored to the project’s specific pressure, temperature, and flow capacity requirements, delivering optimal over-pressure protection.
Why DERVOS VALVE?
Our team’s expertise in valve selection and customization ensured seamless integration of our products into ECOFUEL’s processes. From gate valves to safety valves, DERVOS’s comprehensive product range met the diverse demands.
A Step Towards a Sustainable Future
DERVOS, as a leading valve manufacturer, is proud to support the ECOFUEL Innovation Project, demonstrating our commitment to global environmental protection. By delivering reliable flow control solutions, we help industries adopt cleaner, more sustainable technologies.
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 refinery of MOL, located in Hungary, requires regular ball valve and check valve replacements to maintain optimal performance. As a trusted check and ball valve supplier of MOL, DERVOS continues to provide ball valves for their operations. In this project, DERVOS supplied a batch of high-performance ball valves and check valves for fluid control in oil and gas applications. They required various types and specifications of ball and check to meet the operational and sealing requirements of different pipeline systems.
DIN Ball Valve Full Pore RF Floaing Ball Fire Proof anti-static Lever WCB Body A105+ENP Ball 17-4PH Stem F304+Ni55 Seat X750 Spring Welding Flange Heating Jacket DN100 PN16 Quick Detail Type Ball Valve Size DN100 Design Pressure PN16 Construction Floating ball valve ConnectionType Raised Face Flange OperationType Lever Body Material WCB BallMaterial A105+Ni60 Stem Material 17-4PH SeatMaterial F304+Ni55 Design Code EN12516-1 Face to Face Dimension EN558-1 End Connection EN1092-1 B1 Pressure & Temp EN12266 Medium Water, Oil and Gas Origin China
The 6 Inch PSB globe valve has 1500LB design pressure, butt weld end, and gearbox. The full bore globe valve is made of carbon steel WCB body and trim 5 material. Quick Detail Type Globe Valve Size 6'' Design Pressure Class 1500 Construction Pressure Seal Bonnet, Plug Type Disc, Rising Stem Connection Type Butt Weld Operation Type Bevel Gearbox Opearted Design Code BS 1873 End to End ASME B16.10 Connection End ASME B16.25 Pressure & Temperature ASME B16.34 Test & Inspection Standard API 598 Body Material Cast Steel WCB Trim Material Trim NO. 5 Temperature Range -29℃~+425℃ Application WOG Origin China Material & Dimension NPS DN Class 2 2 1/2 3 4 6 8 50 65 80 100 150 200 L(RF) L1(BW) 900LB 368 419 381 457 610 737 1500LB 368 419 470 546 705 832 2500LB 451 508 578 673 917 1022 L2(RTJ) 900LB 371 422 384 460 613 740 1500LB 371 422 473 549 711 841 2500LB 454 514 584 683 927 1038 H(Opne) 900LB 550 605 678 798 930 1230 1500LB 550 605 866 956 1260 1263 2500LB 560 720 755 1230 1791 2086 W 900LB 350 350 400 450 458 610* 1500LB 400 400 450 560 610* 610* 2500LB 400 450 560 310* 610* 760 Weight (RF) 900LB 78 108 102 142 400 960 1500LB 85 110 135 230 660 1590 2500LB 140 168 247 620 1500 3200 Weight (BW) 900LB 66 91 87 128 355 868 1500LB 77 101 122 209 595 1440 2500LB 100 118 180 438 1148 2594 *Manual gear operator is recommended No Part Name Carbon steel to ASTM Alloy steel to ASTM Stainless steel to ASTM WCB WC6 WC9 C5 CF8 CF8M CF3 CF3M 1 Body A216 WCB A217 WC6 A217 WC9 A217 C5 A351 CF8 A351 CF8M A351 CF3 A351 CF3M 2 Seat Ring A105 A182 F11 A182 F22 A182 F5 A182 F304 A182 F316 A182 F304L A182 F316L 3 Disc A105 A182 F11 A182 F22 A182 F5 A182 F304 A182 F316 A182 F304L A182 F316L 4 Stem A182 F6 A182 F304 A182 F304 A182 F316 A182 F304L A182 F316L 5 Disc nut A182 F6 A182 F304 A182 F304 A182 F316 A182 F304L A182 F316L 6 Cap SS Spiral Wound graphite or SS Spiral Wound PTFE 7 Body Seal Flexible Graphite+316 8 Adjustment Gasket F6 F6 F316 9 Stem packing Flexible Graphite+316 10 Gland Nut A194 2H A194 8 11 Gland Eyebolt A193 B7 A193 B8 12 Pin Carbon steel or Stainless Steel 13 Cap Nut Carbon steel or Stainless Steel 14 Gland A182 F6 A182 F304 A182 F316 A182 F304L A182 F316L 15 Gland Flange A216 WCB A351 CF8 16 Yoke A216 WCB A351 CF8 17 Stem Nut A439 D2 or B148-952A 18 Screw Carbon steel 19 Handwheel Ductile Iron or carbon steel 20 Name Plate Stainless steel or Aluminum 21 Washer Carbon steel 22 Nut Carbon steel or Stainless Steel Related Knowledge Why do we use pressure seal bonnet? Pressure sealed bonnet are often used for valves with high design pressure. The higher the internal pressure gets, the greater the sealing force beween body and bonnet become. For bolted bonnet valves, the body and bonnet are joined by studs and nuts with a gasket between the flange faces to facilitate sealing. However,as system pressure increases,the potential for leakage through the body and bonnet increases. But for pressure sealed valve, “bonnet take-up bolts” to pull the bonnet up and seal against the pressure seal gasket. That is why when pressure increase, the performance of pressure seal gasket between body and bonnet becomes better.
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
8" 2500LB DBB Trunnion Mounted Ball valve is made according to API 6D standard. The valve body is made of A182 F51. It has the structural characteristics of DBB Fixed Ball Valve, Full Bore, Fireproof/Electrostatic/Anti-Exposed Stem Design, Compliant with NACE MR0175. Its connection mode is RTJ. And it has Turbine operation mode with locking device.
API 6D ball valve is designed with trunnion mounted ball and full bore structure. The flanged ball valve has 300LB design pressure and 8 inch nominal size with gearbox operation mode, conforming to NACE MR0175 requirement. Quick Detail Type Ball Valve Size 8” Pressure 300LB Construction Two-Piece Body, Full Bore, Trunnion Ball Connection RF Flange Operation Mode Gearbox Body Material A216 WCB Trim Material Ball/Stem F6a, Seat RPTFE Design & Manufacture API 6D Pressure & Temp Code ASME B16.34 End to End ASME B16.10 End Connection ASME B16.5 Inspection API 6D, API 598 Temperature Range -29℃~+200℃ Medium Oil, Water, Gas Dervos Packing Painting Test & Report Pressure Testing & Dimension Checking
6"X4" 90LB ball valve is made according to ASME B16.34 standard. The valve body is made of A105. It has the structural characteristics of reduced diameter, fixed ball, DIB-1, fireproof, anti-static, 3-piece. Its connection mode is RTJ. And it has worm wheel operation mode.
DN200 PN40 globe valve is made according to EN13709 standard. The valve body is made of ASTM A216 WCB+STL. It has the structural characteristics of straight through, bolted cover and structural length of 595mm. Its connection mode is EN1092-1 B1. And it has gear operation mode.
6" 300LB globe valve is made according to BS1873 standard. The valve body is made of ASTM A216 WCB. It has the structural characteristics of straight through, rising stem. Its connection mode is RF. And it has gearbox with lock operation mode.
The 1-1/2 inch globe valve, designed as per API 623, has a bomb-shaped body and a parabolic plug both of which optimize the smooth flow of the media. The valve is made of stainless steel and is equipped with a handwheel, easy to operate and maintain.
The eccentric butterfly valve has triple offset design. It has excellent sealing performance and longer service life due to its small abrasion on sealing face during operation of valve. The 30'' butterfly valve is designed with ANSI 150 double flanged connection and fully metal seat. Quick Detail Type Butterfly Valve Size 30 Inch DesignPressure ANSI 150 Construction Triple Offset/ Triple Eccentric ConnectionType RF Double Flanged Type Operation Gearbox Operation Design Code API 609 Face to Face ASMEB16.10 End Connection ASMEB16.5 Test & Inspection API 598 Body Material A216 WCB TemperatureRange -29℃~+427℃ Application Water, Oil, Gas Available Product Range Norminal Size: 2 Inch ~150 Inch Design Pressure: 150LB~900LB Valve Connection: Flanged, Lug, Wafer, Butt Weld (BW) Valve Operation: :Lever/Wrench, Gearbox, Motorized, Pneumatic Body Material: Carbon Steel WCB, Stainless Steel CF8/CF8M/CF3/CF3M, Low Temperature Steel LCB/LCC Seat Material: Fully metal seat, SS+Graphite Seat
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