Trusted Non Slam Check Valve Manufacturer
NTVAL provides Non Slam Check Valves designed to prevent backflow and water hammer, ensuring smooth operation in tough environments. Our precision-engineered valves close without slamming, reducing system wear. Trust NTVAL for reliable, efficient, and safe valve solutions.
Reliable Non Slam Check Valve
The Non Slam Check Valve is a specially designed valve that controls fluid flow in one direction without creating loud or sudden sounds when it closes. When fluid flows forward, the valve opens smoothly. If the flow reverses, the valve closes gradually, reducing pressure surges and avoiding the “water hammer” effect that can damage pipelines.
This valve is ideal for applications where quiet operation and steady flow are important. Its simple, efficient design helps extend the life of the system, making it useful in a range of industries.
Quality Control
The PMI test confirms that each Non Slam Check Valve contains the correct materials, aligning with specifications for dependable performance and durability.
PMI Test
During the sealing test, we check that the Non Slam Check Valve completely blocks any reverse flow, keeping fluid movement strictly controlled.
Sealing Test
The low emission test checks for minimal leaks, helping the Non Slam Check Valve meet environmental standards for cleaner, safer operation.
Low Emission Test
This impact test assesses the Non Slam Check Valve’s toughness, verifying it withstands sudden forces without compromising its reliable flow control.
Impact Test
Dimension inspection verifies that each Non Slam Check Valve fits exactly, supporting a tight seal and smooth operation in its system.
Dimension Inspection
The painting thickness test measures the valve’s coating, ensuring it has strong corrosion protection for a longer, reliable service life.
Painting Thickness Test
Penetrant testing highlights any small surface flaws on the Non Slam Check Valve, which could weaken its overall strength under pressure.
PT
Material inspection guarantees that all components of the Non Slam Check Valve meet quality standards, supporting durable, safe operation over time.
Material Inspection
Our Valve Applications in Key Industries
Discover how our advanced valve solutions improve flow control, delivering enhanced efficiency, safety, and strict quality assurance.
Non Slam Check Valves prevent dangerous backflow in chemical plants, ensuring safe one-way fluid control, even with harsh, reactive substances.
Chemical Processing
For petrochemical plants, Non Slam Check Valves manage high-pressure fluids, keeping dangerous gases or oils from flowing backward into systems.
Petrol Chemical
In nuclear settings, Non Slam Check Valves protect pressurized systems from backflow, reducing risks by maintaining strict fluid flow direction.
O.P.G & Nuclear
Non Slam Check Valves control the direction of pulp flow, resisting blockages and providing steady performance, even with thick fluids.
Pulp
In mining, Non Slam Check Valves prevent backflow, handling abrasive materials and protecting against reverse pressure that could disrupt operations.
Mining
Non Slam Check Valves offer secure flow control in water and sewage systems, keeping fluids from reversing and causing contamination.
Water & Sewage
Non Slam Check Valves control steam flow, stopping backflow that could damage equipment and reduce efficiency in industrial steam applications.
Steam System
In boiling systems, Non Slam Check Valves handle high temperatures and keep hot water from reversing, supporting safe, stable operations.
Boiling System
Get More Versatile Valve
Learn More About Non Slam Check Valve
- Resilient or Metal Seat
- Size Range: NPS 2 to NPS 36
- Pressure Range: 150LB to 2500LB
- Design STD.: ASME B16.34
- Non Slam Check Valve Manufacturer
Features
Minimal Moving Parts
The disc is the only moving part, minimizing wear and enhancing durability.
Axial Disc Movement
The disc and seating configuration provide a streamlined flow path with a venturi effect, resulting in a low-pressure drop.
Short Stroke of Spring-Assisted Disc
The inlet flow velocity moves the disc axially with a short stroke. As the flow velocity reduces, a compressed spring initiates valve closure, providing a quick response.
Customizable Spring Options
The choice of spring affects critical velocity and valve response. Selection is made based on engineering evaluation of specific applications. In the absence of this data, a standard spring will be provided.
Characteristics
The dual plate check valve, also known as the zero velocity valve, addresses the shortcomings of traditional check valves. It is highly effective, versatile for any fluid and service conditions, easy to manage, and can be installed in any pipe structure without restrictions.
Opening
The reduced pressure created by increased velocity in the narrow flow area adds extra force to help the disc open, while additional spring loading ensures faster closing.
This spring force is balanced when the valve is fully open. The non-slam check valve’s design considers the required velocity to keep the disc securely open against its stop, even during moderate flow oscillations.
Closing
When there is a noticeable reduction in flow, the disc responds immediately to limit backflow and prevent valve slamming.
The spring load, lightweight disc, and short movement allow for a quick, self-dampening reaction.
In some cases, the internal geometry can be adjusted to better suit specific service conditions.
Standard Materials of Construction
| Part Name | Standard Carbon Steel | Low TemperatureCarbon Steel | Stainless Steel |
| Valve Body | ASTMA216 WCB | ASTMA352 LCC | ASTMA351CF8M/316 Stainless Steel |
| Difuser | ASTMA216 WCB | ASTMA352 LCC | ASTMA351 CF8M/316 Stainless Steel |
| Valve Disc | ASTMA351CF8M/316 Stainless Steel | ASTMA351 CF8M/316 Stainless Steel | ASTMA351 CF8M/316 Stainless Steel |
| Seat | Alloy625 | Alloy625 | Alloy625 |
| HelicalSpring | AlloyX-750 | AlloyX-750 | AlloyX-750 |
| RadialGuide | AlloyX-750 | AlloyX-750 | AlloyX-750 |
| Screw | ASTMA193 B8M | ASTMA320 B8M | ASTMA193 B8M |
| CentalTie Boit | ASTMA193 B7M | ASTMA320 L7M | ASTMA193 B8M |
| Guide Bushing | Gr.630Stainless Steel | Gr.630 Stainless Steel |
Dimension
- Cast Steel Check Valve, Axial Flow
- Uni-body, Horizontal or Vertical Lines
- Spring-assisted slow closing, Watertight Seating
- Designed to ASME B16.34, API 6D
| Face to Face | ASME/ANSI B16.10 |
| End Flange | ASME/ANSI B16.5 |
| Butt Weld | ASME/ANSI B16.25 |
| Class | ASME/ANSI CL150~CL2500 |
| CLASS 150 DIMENSION | CLASS 300 DIMENSION | ||||||||||||
| VATAC Standard | API 6D Standard | VATAC Standard | API 6D Standard | ||||||||||
| SIZE (IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E | SIZE(IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E |
| Unit:mm | Unit:mm | ||||||||||||
| 2 | 216 | 203 | 203 | 2 | 283 | 267 | 267 | ||||||
| 3 | 254 | 241 | 241 | 3 | 333 | 317 | 317 | ||||||
| 4 | 305 | 292 | 292 | 4 | 371 | 356 | 356 | ||||||
| 6 | 266 | 253 | 265 | 368 | 356 | 356 | 6 | 269 | 253 | 265 | 460 | 444 | 444 |
| 8 | 308 | 295 | 305 | 508 | 495 | 495 | 8 | 311 | 295 | 305 | 549 | 533 | 533 |
| 10 | 378 | 365 | 380 | 635 | 622 | 622 | 10 | 381 | 365 | 380 | 638 | 622 | 622 |
| 12 | 448 | 435 | 450 | 711 | 698 | 698 | 12 | 451 | 435 | 450 | 727 | 711 | 711 |
| 14 | 488 | 475 | 490 | 800 | 787 | 787 | 14 | 491 | 475 | 490 | 854 | 838 | 838 |
| 16 | 558 | 545 | 560 | 876 | 864 | 864 | 16 | 561 | 545 | 560 | 879 | 864 | 864 |
| 18 | 623 | 610 | 630 | 991 | 978 | 978 | 18 | 626 | 610 | 630 | 994 | 978 | 978 |
| 20 | 688 | 675 | 700 | 991 | 978 | 978 | 20 | 694 | 675 | 700 | 1035 | 1016 | 1016 |
| 24 | 823 | 810 | 835 | 1308 | 1295 | 1295 | 24 | 832 | 810 | 835 | 1368 | 1346 | 1346 |
| 28 | 549 | 579 | 8441 | 8441 | 28 | 970 | 945 | 975 | 1524 | 1499 | 1499 | ||
| 30 | 101 | 5401 | 4251 | 4251 | 30 | 1035 | 1010 | 1045 | 1619 | 1594 | 1594 | ||
| 32 | 1080 | 1115 | 32 | 1109 | 1080 | 1115 | |||||||
| 36 | 1215 | 1250 | 1956 | 1956 | 36 | 1244 | 1215 | 1250 | 2112 | 2083 | 2083 | ||
| 40 | 1350 | 1390 | 40 | 1350 | 1390 | ||||||||
| 42 | 1415 | 1460 | 42 | 1415 | 1460 | ||||||||
| 48 | 1615 | 1650 | 48 | 1615 | 1650 | ||||||||
| CLASS 400 DIMENSION | CLASS 600 DIMENSION | ||||||||||||
| VATAC Standard | API 6D Standard | VATAC Standard | API 6D Standard | ||||||||||
| SIZE (IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E | SIZE(IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E |
| Unit:mm | Unit:mm | ||||||||||||
| 2 | 295 | 292 | 292 | 2 | 295 | 292 | 292 | ||||||
| 3 | 359 | 356 | 356 | 3 | 359 | 356 | 356 | ||||||
| 4 | 409 | 406 | 406 | 4 | 435 | 432 | 432 | ||||||
| 6 | 256 | 253 | 265 | 498 | 495 | 495 | 6 | 256 | 253 | 265 | 562 | 559 | 559 |
| 8 | 298 | 295 | 305 | 600 | 597 | 597 | 8 | 298 | 295 | 305 | 664 | 660 | 660 |
| 10 | 368 | 365 | 380 | 676 | 673 | 673 | 10 | 368 | 365 | 380 | 791 | 787 | 787 |
| 12 | 438 | 435 | 450 | 765 | 762 | 762 | 12 | 438 | 435 | 450 | 841 | 838 | 838 |
| 14 | 478 | 475 | 490 | 892 | 889 | 889 | 14 | 478 | 475 | 490 | 892 | 889 | 889 |
| 16 | 548 | 545 | 560 | 905 | 902 | 902 | 16 | 548 | 545 | 560 | 994 | 991 | 991 |
| 18 | 613 | 610 | 630 | 1019 | 1016 | 1016 | 18 | 613 | 610 | 630 | 1095 | 1092 | 1092 |
| 20 | 681 | 675 | 700 | 1060 | 1054 | 1054 | 20 | 681 | 675 | 700 | 1200 | 1194 | 1194 |
| 24 | 819 | 810 | 835 | 1407 | 1397 | 1397 | 24 | 819 | 810 | 835 | 1407 | 1397 | 1397 |
| 28 | 958 | 945 | 975 | 1613 | 1600 | 1600 | 28 | 958 | 945 | 975 | 1613 | 1600 | 1600 |
| 30 | 1023 | 1010 | 1045 | 1664 | 1651 | 1651 | 30 | 1023 | 1010 | 1045 | 1664 | 1651 | 1651 |
| 32 | 1096 | 1080 | 1115 | 32 | 1096 | 1080 | 1115 | ||||||
| 36 | 1231 | 1215 | 1250 | 2099 | 2083 | 2083 | 36 | 1231 | 1215 | 1250 | 2099 | 2083 | 2083 |
| 40 | 1350 | 1390 | 40 | 1350 | 1390 | ||||||||
| 42 | 1415 | 1460 | 42 | 1415 | 1460 | ||||||||
| 48 | 1615 | 1650 | 48 | 1615 | 1650 | ||||||||
| CLASS 900 DIMENSION | CLASS 1500 DIMENSION | ||||||||||||
| VATAC Standard | API 6D Standard | VATAC Standard | API 6D Standard | ||||||||||
| SIZE (IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E | SIZE(IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E |
| Unit:mm | Unit:mm | ||||||||||||
| 2 | 371 | 368 | 368 | 2 | 371 | 368 | 368 | ||||||
| 3 | 384 | 381 | 381 | 3 | 473 | 470 | 470 | ||||||
| 4 | 238 | 235 | 238 | 460 | 457 | 457 | 4 | 238 | 235 | 238 | 549 | 546 | 546 |
| 6 | 306 | 303 | 306 | 613 | 610 | 610 | 6 | 306 | 300 | 306 | 711 | 705 | 705 |
| 8 | 344 | 341 | 344 | 740 | 737 | 737 | 8 | 344 | 335 | 344 | 841 | 832 | 832 |
| 10 | 394 | 391 | 394 | 841 | 838 | 838 | 10 | 394 | 385 | 394 | 1000 | 991 | 991 |
| 12 | 451 | 448 | 451 | 968 | 965 | 965 | 12 | 451 | 435 | 451 | 1146 | 1130 | 1130 |
| 14 | 494 | 485 | 494 | 1038 | 1029 | 1029 | 14 | 494 | 475 | 494 | 1276 | 1257 | 1257 |
| 16 | 610 | 558 | 610 | 1140 | 1130 | 1130 | 16 | 567 | 545 | 567 | 1407 | 1384 | 1384 |
| 18 | 632 | 619 | 632 | 1232 | 1219 | 1219 | 18 | 632 | 610 | 632 | 1559 | 1537 | 1537 |
| 20 | 697 | 684 | 697 | 1334 | 1321 | 1321 | 20 | 697 | 675 | 697 | 1686 | 1664 | 1664 |
| 24 | 838 | 819 | 838 | 1568 | 1549 | 1549 | 24 | 838 | 810 | 838 | 1972 | 1943 | 1943 |
| CLASS 2500 DIMENSION | ||||||
| VATAC Standard | API 6D Standard | |||||
| SIZE (IN) | R.T.J | R.F | W.E | R.T.J | R.F | W.E |
| Unit:mm | ||||||
| 2 | – | – | – | 454 | 451 | 451 |
| 3 | – | – | – | 584 | 578 | 578 |
| 4 | 304 | 295 | 253 | 683 | 673 | 673 |
| 6 | 403 | 390 | 324 | 927 | 914 | 914 |
| 8 | 446 | 430 | 367 | 1038 | 1022 | 1022 |
| 10 | 562 | 540 | 424 | 1292 | 1270 | 1270 |
| 12 | 617 | 595 | 486 | 1445 | 1422 | 1422 |
Specifications
The non-slam check valve, also known as a nozzle check valve, automatically opens and closes its disc based on the flow of the medium. It’s designed to reduce noise when opening or closing. As an automatic valve, its main functions are to prevent backflow, stop the pump and motor from reversing, and release the medium from a container. It can also be used in supply lines where the pressure in an auxiliary system may rise above the main system pressure.
The non-slam check valve ensures that the flow only moves in one direction, preventing reverse flow. The valve disc opens when fluid pressure flows in the correct direction and closes when the flow reverses, cutting off the flow. However, this valve is not suitable for media containing solid particles or high viscosity.
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3 Considerations When Buying Non Slam Check Valve
Specs of Non Slam Check Valve
Material Construction
Non Slam Check Valves are made from durable materials like stainless steel or ductile iron. These materials help the valve withstand harsh environments and resist corrosion over time. NTVAL uses high-quality materials to guarantee long-lasting performance in industrial applications.
Flow Rate Capacity
The flow rate capacity of a Non Slam Check Valve determines how much fluid it can handle efficiently. These valves can manage flow rates ranging from 10 to 2,000 GPM, depending on the size and application. The precise design of the valve allows the flow rate to be optimized for different pressure conditions, preventing backflow and maintaining system integrity.
Temperature Range
Non Slam Check Valves can operate within a wide temperature range, from -20°F to 400°F. This versatility makes them ideal for use in both hot and cold fluid systems. And on top of that, the ability to handle extreme temperatures guarantees the valve’s functionality in diverse industrial applications.
Features of the Non Slam Check Valve
Spring-Assisted Closure
The Non Slam Check Valve features a spring-assisted closure mechanism, which activates as the flow velocity decreases. This design prevents backflow and eliminates the risk of water hammering for a safe and controlled shutdown of the valve.
Axial Disc Movement
The valve’s design features an axial disc movement, which means the disc moves in a straight line rather than swinging. Here’s why that’s important: this movement minimizes wear and tear, allowing for a smoother flow of fluids and reducing maintenance needs over time.
Versatile End Connections
NTVAL's Non Slam Check Valve is available with multiple end connection options, such as flanged, butt-weld, and RTJ ends. This versatility makes it easy to integrate the valve into various piping systems, whether in an oil refinery or a chemical processing plant.
Benefits of the Non Slam Check Valve
Reduced Maintenance Costs
With its few moving parts and durable construction, the Non Slam Check Valve requires less maintenance than traditional valves. For instance, this simplicity reduces the risk of wear and tear, leading to fewer repairs and replacements. The long-lasting design allows the valve to perform reliably over time, reducing the overall cost of ownership.
Increased Safety and Reliability
The Non Slam Check Valve's rapid response and anti-slam features increase the safety and reliability of industrial systems. By preventing water hammering and maintaining smooth operation, the valve protects equipment and personnel from potential hazards. Its durable materials and precision engineering offer reliable performance under varying conditions.
Improved Efficiency
The Non Slam Check Valve's low-pressure drop feature maintains a steady and efficient flow of oil. This reduces the energy required to pump fluids through the system, leading to lower operational costs. The valve's efficiency contributes to consistent production levels, making it ideal for demanding industrial applications.
Applications of Non Slam Check Valve
Steam and Boiling Systems
In steam and boiling systems, Non Slam Check Valves are essential for managing the flow of steam and hot water, helping to avoid reverse flow. This is particularly important for preventing water hammer, which can damage pipes and boilers. Built to withstand high temperatures and pressures, these valves help maintain safe and reliable operation in steam networks.
Power Generation
Power plants, particularly those using steam turbines, rely on Non Slam Check Valves to manage the flow of steam and cooling water. These valves help prevent water hammer, which can cause severe damage to turbine blades and other critical components. And you know what? By maintaining a steady flow, the valve supports the plant’s overall efficiency and helps avoid costly downtime.
HVAC Systems
Non Slam Check Valves are also used in Heating, Ventilation, and Air Conditioning (HVAC) systems to control the flow of refrigerants and water. For example, in large commercial buildings, these valves help maintain the correct pressure levels, providing efficient heating and cooling throughout the facility. This application is essential for providing a comfortable environment while optimizing energy use in the building.
Water Treatment Facilities
In water treatment facilities, the Non Slam Check Valve is used to control the flow of water in different stages of purification and distribution. Its ability to prevent backflow allows treated water to remain uncontaminated, maintaining the quality of the water supply. NTVAL’s valves are particularly valued for their reliability in these applications, where consistent operation is essential.
3 Considerations When Buying Non Slam Check Valve
01
API Certified
When buying a Non Slam Check Valve, it’s important to make sure it is API certified. An API (American Petroleum Institute) certification means that the valve has been tested and proven to meet the specific safety and performance standards required in the oil and gas industry. Choosing an API-certified valve certifies that the product is reliable and safe for use in challenging environments, reducing the risk of failures.
02
Venturi Pattern Design
Another important consideration is the Venturi pattern design of the valve, which impacts the efficiency of fluid flow. This design reduces pressure drop across the valve, providing a steady and efficient flow of liquids or gases. For large projects like chemical processing plants, this design helps optimize energy use by minimizing resistance, which is critical for maintaining consistent production levels.
03
Ultra-Fast Closing Action
The ultra-fast closing action of a Non Slam Check Valve is essential for preventing water hammer and protecting the integrity of the pipeline. This is particularly important in systems where sudden changes in flow can occur, such as in power generation plants. My point is that choosing a valve with this capability allows your project’s pipeline to remain secure, minimizing the risk of damage and costly downtime.
FAQs
The maintenance requirements for these valves are minimal due to their simple design and few moving parts. Regular inspections should be conducted to check for wear and tear, especially on the disc and spring components.
Our quality guarantee period for these valves is 18 months from the delivery date. This warranty period provides assurance that the valves will perform reliably over time.
Our Non Slam Check Valves are certified under various international standards, including ISO9001, ISO14001, ISO45001, API6D, and API607.
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