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 |
| H41X-16Q-50 |
2 |
50 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-65 |
2.5 |
65 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-80 |
3 |
80 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-100 |
4 |
100 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-125 |
5 |
125 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-150 |
6 |
150 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-200 |
8 |
200 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-250 |
10 |
250 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-300 |
12 |
300 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-350 |
14 |
350 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
| H41X-16Q-400 |
16 |
400 |
Flange End |
Flexible Disc |
1.0/1.6Mpa |
Red/Blue |
Q1: How does the "silence" feature of the H41X check valve work and what are its benefits?
A: The "silence" feature in the H41X check valve is mainly due to its flexible disc design. When the valve closes to prevent backflow, the flexible disc moves smoothly and gently, reducing the water hammer effect. Water hammer occurs when the flow is suddenly stopped, creating a pressure surge and often a loud noise. By minimizing this, it protects the piping system from potential damage caused by the pressure shock and also reduces operational noise, which is beneficial in noise - sensitive environments like buildings with offices or residential spaces.
2.Q2: Can the H41X check valve be used in a system with frequent on - off cycles?
A: Yes, the H41X check valve is suitable for systems with frequent on - off cycles. Its construction, with a ductile iron body and a flexible disc covered by NBR, is designed to withstand repeated opening and closing. The use of quality materials like SS304 stainless - steel for screws and NBR for the gasket and disc covering ensures durability and reliable operation over time. However, regular maintenance, such as checking for wear and tear on the disc and gasket, is recommended to ensure continued optimal performance.
3.Q3: What maintenance tasks are required to keep the NBR - covered disc in good condition?
A: Regular visual inspections of the NBR - covered disc are essential. Look for signs of cracking, peeling, or any damage to the NBR coating. Ensure that the disc moves freely within the valve body and is not stuck or obstructed. If the system transports fluids that could potentially degrade the NBR material (such as certain chemicals), more frequent inspections may be needed. In case of any damage, the disc should be replaced promptly to maintain the valve's functionality and prevent leaks or improper operation.
4.Q4: How does the choice of ductile iron for the body material contribute to the valve's performance?
A: Ductile iron used for the body of the H41X check valve offers several advantages. It has high strength and durability, allowing the valve to withstand high pressures within its working range (0/6Mpa). It also has good shock - absorbing properties, which, combined with the flexible disc, helps in reducing the impact of water hammer. Additionally, ductile iron is relatively cost - effective compared to some other high - strength materials, making the valve a practical choice for many applications.
5.Q5: Can the H41X check valve be installed in a system that operates at temperatures outside the normal range?
A: The H41X check valve is designed to operate within certain temperature limits. While the materials used (such as ductile iron and NBR) have some tolerance to temperature variations, extreme temperatures can affect their performance. In high - temperature applications, the NBR may degrade over time, and in low - temperature applications, the flexibility of the disc may be reduced. If operating outside the normal temperature range, it's advisable to consult the manufacturer for guidance on using appropriate insulation, heat - resistant coatings, or alternative materials to ensure the valve functions properly.
6.Q6: How do I ensure proper alignment when installing the H41X check valve with flanges?
A: When installing the H41X check valve, first, clean the mating flanges of any debris or dirt. Then, align the valve's flanges with the pipeline flanges, making sure that the bolt holes are properly aligned. Use a straightedge or alignment tool if necessary. Tighten the bolts in a criss - cross pattern to ensure even compression of the gasket and proper sealing. Improper alignment can lead to uneven stress on the valve, gasket failure, and potential leaks.
7.Q7: What is the impact of the working pressure range (0/6Mpa) on the valve's selection for a specific application?
A: The working pressure range is a crucial factor in valve selection. If the system's operating pressure is within the 0/6Mpa range, the H41X valve can be considered. However, if the pressure is consistently at the upper limit or exceeds it, the valve may experience premature wear or failure. On the other hand, if the pressure is well below the lower limit, the valve may not operate as efficiently. It's important to match the valve's working pressure range with the actual system pressure for reliable performance.
8.Q8: Can the H41X check valve be used in a system that transports abrasive fluids?
A: Using the H41X check valve in a system with abrasive fluids can pose challenges. The abrasive particles in the fluid can wear down the disc, the valve seat, and other internal components over time. While the NBR - covered disc provides some protection, it may not be sufficient in highly abrasive environments. In such cases, additional measures like installing a strainer upstream to filter out the abrasive particles or using a more abrasion - resistant material for the disc may be necessary to prolong the valve's lifespan.
9.Q9: How does the SS304 stainless - steel screw material affect the valve's corrosion resistance?
A: The use of SS304 stainless - steel for the screws in the H41X check valve significantly enhances its corrosion resistance. Stainless - steel is highly resistant to rust and corrosion, which is important in many applications where the valve may be exposed to moisture, water, or corrosive substances. This helps maintain the integrity of the valve's assembly, ensuring that the screws do not corrode and loosen over time, which could lead to valve malfunction or leakage.
10.Q10: Can the H41X check valve be integrated into a larger automated control system?
A: The H41X check valve can be integrated into a larger automated control system. It can be combined with sensors (such as pressure sensors or flow sensors) and actuators (if additional control over the valve's opening and closing is required). For example, in a smart water - management system, the valve's status can be monitored, and its operation can be adjusted based on real - time data from the sensors. However, additional components and proper programming are needed to achieve seamless integration.
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