Ductile Iron PN16 Flanged Check Valve is a valve whose opening and closing parts are opened or closed by the force of the flow of the medium to prevent the medium from flowing back. The check valve only allows the medium to flow in one direction and prevents the flow in the opposite direction. Usually this kind of valve works automatically. Under the action of the fluid pressure flowing in one direction, the valve flap opens; when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve flap act on the valve seat, thereby cutting off the flow. It is mainly used in pipelines where the medium flows in one direction, and only allows the medium to flow in one direction to prevent accidents.
| Model Number |
Inch |
mm |
Connection |
Valve Type |
Working Pressure |
Color |
| H44X-16Q-50 |
2 |
50 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-65 |
2.5 |
65 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-80 |
3 |
80 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-100 |
4 |
100 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-125 |
5 |
125 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-150 |
6 |
150 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-200 |
8 |
200 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-250 |
10 |
250 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-300 |
12 |
300 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-350 |
14 |
350 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H44X-16Q-400 |
16 |
400 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
Q1: How does the use of SS304 stainless - steel for the screw material contribute to the valve's performance?
A: SS304 stainless - steel is highly corrosion - resistant, which means the screws in the H44X valve are less likely to rust or corrode over time. This helps maintain the integrity of the valve's assembly, ensuring that the components remain tightly fastened and the valve operates smoothly. It also extends the valve's lifespan, especially in environments where moisture or corrosive substances are present.
2.Q2: Can the H44X check valve be used in a system with high - velocity fluid flow?
A: The H44X check valve is designed to handle a certain range of fluid velocities. While it can accommodate relatively high - velocity flow, if the velocity exceeds the valve's rated capacity, it may cause excessive wear on the flexible disc and other components. Additionally, high - velocity flow can generate increased pressure drops. It's important to ensure that the system's flow velocity is within the valve's recommended operating range for optimal performance and longevity.
3.Q3: What maintenance is required for the NBR (Nitrile Butadiene Rubber) gasket in the H44X valve?
A: Regularly inspect the NBR gasket for signs of wear, cracking, or degradation. Since NBR is resistant to oil, fuel, and many chemicals, it generally has good durability. However, exposure to extreme temperatures, certain solvents, or prolonged mechanical stress can affect its performance. If any damage is detected, the gasket should be replaced promptly to prevent leaks. Also, keep the area around the valve clean to avoid debris that could damage the gasket.
4.Q4: How does the working pressure range of 0/6Mpa impact the installation and operation of the H44X valve?
A: The working pressure range determines the maximum and minimum pressures at which the valve can operate safely and effectively. During installation, it's crucial to ensure that the system's pressure is within this range. Operating the valve below 0Mpa may result in inefficient operation or failure to close properly, while pressures above 6Mpa can cause damage to the valve's components, such as the body or the flexible disc.
5.Q5: Can the H44X check valve be installed in a vertical pipeline?
A: The H44X check valve can be installed in a vertical pipeline, but the orientation needs to be considered. For proper operation, the valve should be installed in a way that allows the flexible disc to function correctly under the influence of gravity and fluid flow. In a vertical pipeline, the direction of fluid flow and the position of the valve relative to the flow direction are important factors. Refer to the manufacturer's installation guidelines for the correct vertical installation orientation.
6.Q6: What is the significance of the different inch sizes available for the H44X check valve?
A: The different inch sizes (from 2 - 18 inches) allow the H44X check valve to be used in a wide variety of piping systems. The size determines the flow capacity of the valve, with larger sizes capable of handling higher flow rates. When selecting a valve for a specific application, the appropriate size must be chosen based on the system's flow requirements and the size of the existing pipeline to ensure proper fit and efficient operation.
7.Q7: How does the flexible disc design of the H44X valve contribute to its function as a check valve?
A: The flexible disc in the H44X valve is designed to open and close in response to the direction of fluid flow. When the fluid flows in the correct direction, the disc opens, allowing the fluid to pass through with minimal resistance. When the fluid attempts to flow in the reverse direction, the disc closes tightly against the valve seat, preventing backflow. This flexible design enables smooth operation and reliable prevention of reverse flow.
8.Q8: Can the H44X check valve be used in a system that transports corrosive fluids?
A: The H44X check valve can be used in a system transporting corrosive fluids, thanks to its construction materials. The SS304 stainless - steel screws and the NBR - covered ductile iron body and disc provide some resistance to corrosion. However, the specific type and concentration of the corrosive fluid need to be considered. In some cases, additional corrosion - protection measures or the use of more corrosion - resistant materials may be necessary to ensure the valve's long - term performance.
9.Q9: How do I ensure a proper seal when installing the H44X check valve?
A: To ensure a proper seal when installing the H44X check valve, first, make sure the mating flanges are clean and free of debris. Use a suitable gasket (the NBR gasket in this case) and ensure it is properly seated. Tighten the bolts evenly and to the recommended torque specification to avoid uneven compression of the gasket, which could lead to leaks. Additionally, check the alignment of the valve and the flanges to prevent any misalignment - related seal issues.
10.Q10: What is the expected lifespan of the H44X check valve under normal operating conditions?
A: Under normal operating conditions, with proper installation and maintenance, the H44X check valve can have a lifespan of 10 - 15 years. This includes operating within the specified working pressure range, in a non - overly corrosive environment, and with regular inspections and upkeep. However, factors such as the quality of the fluid being transported, the frequency of use, and the operating environment can affect its actual lifespan.
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