The quality and reliability of check valves are imperative to the success of any fluid control system. As such, selecting the right manufacturer is essential. In this blog, we'll discuss six tips to help you choose the best check valve manufacturer in Australia to ensure your system operates smoothly.
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A check valve, also known as a one-way or non-return valve, is a 'self actuating' device that allows the fluid to flow in one direction only. The purpose of a check valve is to prevent backflow or reverse flow in a piping system. In case of reverse flow, a properly functioning check valve will close and block the fluid from flowing in the reverse direction.
Check valves are used in applications where fluid control and backflow prevention are necessary. These include:
Overall, check valves play a major role in preventing backflow and contributing to the safe and efficient operation of fluid control systems across a range of industries and applications.
Your choice of check valve manufacturer is critical to ensuring that you receive the best possible value for your investment. A reputable manufacturer will prioritise quality by using high-grade materials that meet industry regulations and are tailored to the specific requirements of different industries, thus reducing the risk of non-compliance and its associated consequences.
Although partnering with a high-quality manufacturer may require a higher initial investment, it can save you money in the long run by extending the lifespan of your check valves and ensuring the reliable operation of your equipment.
If you are in the market for check valves, here are six tips to help you select the best check valve manufacturer:
A company that values its customers will be responsive to your needs and provide support throughout the entire process. By working with a speciality valve company, you can be confident that you are receiving the best possible service and product for long-term success and optimal efficiency of your systems.
When choosing a check valve manufacturer, their experience and reputation are crucial factors to consider. A well-established company with a solid reputation is more likely to have developed extensive expertise in producing valves that meet industry requirements. This experience is a reliable indicator of their ability to meet your specific needs. Furthermore, their reputation for providing high-quality products and excellent customer service means you can fully trust their support and dependability.
A manufacturer with strict quality control measures throughout their manufacturing process will ensure their products are consistently reliable and long-lasting. These can include rigorous testing and inspection procedures at various stages of production, as well as the use of advanced manufacturing techniques and technologies. By selecting a valve supplier with a demonstrated commitment to product quality, you can have greater confidence in the reliability and durability of their check valves.
Before choosing a valve supplier, always consider the price/performance ratio of the products. While cost is an important factor, it shouldn't be the only consideration. Instead, you should weigh the cost of the valve against its performance and the value it provides for your specific application. Keep in mind that a lower-priced valve may not have the same lifespan or performance as a higher-priced valve with better-quality materials and construction. On the other hand, an expensive valve may not be necessary for your specific needs, and a more affordable option may be a better fit. Ultimately, balancing the cost and performance of the valve is the key to getting the best value for your investment.
When considering a valve supplier, it is important to evaluate their after-sales service to ensure that you receive the necessary support and assistance after your purchase. A trustworthy manufacturer will provide technical support and guidance throughout the installation and operation process, as well as prompt and effective solutions to any issues that may arise. This level of service can greatly reduce the risk of unexpected breakdowns, costly maintenance, and safety hazards, ultimately saving you time and money in the long run.
A manufacturer that offers maintenance services can help you keep your check valves in good working condition. Regular maintenance can also help extend the lifespan of your valves and save you money in the long run by reducing the need for costly repairs or replacements. By partnering with a manufacturer that offers maintenance services, you can have peace of mind knowing that your check valves will be properly maintained and any potential issues will be addressed promptly.
In conclusion, choosing a check valve manufacturer is a crucial decision that can significantly impact the safety, efficiency, and longevity of your fluid control system. By following the tips we've discussed in the blog, you can easily find a manufacturer that prioritises quality, service, and after-sales support to help you achieve the best possible value for your investment.
If you are yet to find a reliable check valves manufacturer, consider working with John Valves. With years of unfailing experience in the industry, we pride ourselves on providing top-notch products and excellent customer service that can exceed your expectations. Get in touch with us to learn more about how we can help you with your fluid control needs.
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The slanted seat check valve also offers enhanced resistance to water hammer. The valve has a double eccentric shaft position as well as an increased seating angle. This yields a shorter valve stroke, thus reducing the time taken for the door to close.
Hydraulic dampers are recommended, especially when the valves are installed on a pumping station where high frequency opening and closing of the valve is required. The valve disc closes quickly over the first 85% of its angular travel before meeting the hydraulic damper. The damper then dissipates the kinetic energy of the disc and forces it to open slightly. The disc closes until it contacts the damper again and this cushions the disc until it returns to its fully closed position, sealing the valve. This function greatly reduces the onset of water hammer due to the damped and controlled method of valve closure.Hydraulic dampers are recommended, especially when the valves are installed on a pumping station where high frequency opening and closing of the valve is required. The valve disc closes quickly over the first 85% of its angular travel before meeting the hydraulic damper. The damper then dissipates the kinetic energy of the disc and forces it to open slightly. The disc closes until it contacts the damper again and this cushions the disc until it returns to its fully closed position, sealing the valve. This function greatly reduces the onset of water hammer due to the damped and controlled method of valve closure.
For more details, please see our slanted seat check valve product information.
Nozzle check valves are designed with the valve disc connected to the stem which is guided on the central horizontal axis. A spring is positioned between the disc and the diffuser sleeve. When flow enters the valve, the hydraulic force exerted onto the front face reacts against the spring, causing the spring to compress and allow the valve to open. When the flow stops, the spring forces the disc to return to the closed position.
Due to the spring-assisted closure and the short linear valve stroke, the nozzle check valve is one of the quickest acting check valves available and is commonly used in pumped systems where water hammer is a potential concern. Because the disc is constantly in the direct line of flow, the head loss characteristics of this valve are higher compared to that of conventional swing check valves.
For more details, please see our nozzle check valve product information.
In order to choose the right check valve for your application, several selection criteria should be considered. First, however, there is not one type of check valves being the best choice for all applications, and the selection criteria may not be equally important for all cases. Some of the things you may need to consider are fluid compatibility, flow characteristics, head loss, non-slam characteristics and total cost of ownership.
All check valves referred to in this article are designed for water and treated wastewater applications, but using the valves for raw wastewater/sewage applications may cause some issues. When selecting a valve for these fluids, you should consider how the presence of solids may potentially affect operation of the valve.
If a check valve closes very fast, it may prevent slamming against upstream equipment such as pumps. However, the rapid closure will not protect against the surges caused by pumps being started and shut down. If the valve opens (and closes) quickly, the flow will change rapidly and thus increase likeliness of surge occurrence.
Head loss is, among other things, a function of fluid velocity. The head loss through a valve is determined by the internal design of the valve and the opening degree. When a valve is designed with a restricted (narrowed) opening compared to the pipeline, the velocity will increase through the valve, increasing the head loss as a result. Vice versa, if a valve is designed with less restriction and bore is equal size to the pipeline, the head loss will be smaller, and the valve will in practice not affect the overall head loss of the system. There are a number of values for head loss, amongst others zeta values, Kv and Kvs values.
The costs for your check valve consist of more than just the purchase price. For some installations, the most important costs may be purchasing and installation, but in other cases, maintenance or energy costs may be equally or even more important. Also protecting more valuable equipment such as e.g. pumps has to be considered, and looking at the valve performance will be crucial. When considering costs as a selection criterion for your check valve, the total costs over the life of the valve should be considered. In general, the simpler the valve construction is, the lower are the maintenance requirements. The higher the Kv value, the lower the energy consumption. The higher the performance, the better the protection ability.
Check valve slam can affect pressure surges in a negative way. First step of the process is when the pump stops, starting the pressure surge. Second step is, when the flow is reversed, slamming against the fully closed check valve. If the check valve closes too fast, the kinetic energy is turned into high pressure, stressing the pipes, and causing high noise.
A slam sounds like if the disc or the ball from the check valve is hitting the seat and can make quite some noise. However, the sound is not caused by the physical closing but by a sound wave arising from a pressure spike stretching the pipe wall.
To prevent the occurrence of check valve slam, the valve should close in a controlled way and slower when near closed position. For a check valve to close slowly, it requires additional ancillary equipment, such as hydraulic dampers, which act as a cushion to the valve door, as it comes into its seated position. This slower closure allows the fluid to pass through the check valve until it closes, causing less kinetic energy turning into high pressure, and thus less energy to feed and maintain the surge. Consideration must be given to the upstream pump to ensure that it is suitable for reverse spin and flow.
As swing check valves have the disc in the flow stream, helping with rapid closure, they have better non-slam characteristics. However, today many pumps are frequency converted, enabling them to adjust the start-up and closure time to avoid water hammer.
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