What are the 2 types of pressure check valves?

Understanding the Two Main Types of Pressure Check Valves

Check valves play a critical role in water and wastewater treatment systems, ensuring that flow remains unidirectional. They are designed to automatically open when pumps are in operation and to close when pumps are turned off, effectively preventing any reverse flow that could lead to system damage. These valves are essential for conserving energy and protecting pumping systems from pressure spikes and reverse flow incidents.

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Choosing the right check valve for your process is akin to selecting the perfect hardware for your new cabinetry. While you may be aware that a check valve is necessary for your system, the decision becomes complex due to the variety of choices available. Each type of check valve is tailored to fulfill specific requirements. Below, we examine the advantages and disadvantages of the two predominant styles: lift check valves and swing check valves.

Lift Check Valves: Versatile and Reliable Options

Lift check valves are frequently utilized in applications involving high-pressure scenarios, such as in commercial high-rises, industrial sectors, and water treatment plants. Known for their reliability and economical benefits, these valves exhibit no external moving parts. However, a potential drawback is that their disc remains in the flow stream during operations, which can lead to higher energy costs over time.

Silent Check Valves

Silent check valves are appreciated for their noiseless closure feature. The valve opens when flow is initiated, and when the pump halts, a compression spring ensures the disc seals tightly against the seat, preventing reverse flow quietly. These valves are predominantly used in clean water applications where high pressure is required.

Nozzle check valves, similar in design to silent check valves, are specifically engineered for high-pressure applications, particularly in industrial and power sectors.

Ball Check Valves

Ball check valves, known for their simplicity and compact nature, find common usage in both water and wastewater systems. They employ a rubber-coated ball that shifts within the valve seat in response to flow changes. However, in high head applications, the movement of the ball can result in slamming, which may cause wear over time.

Swing Check Valves: Commonly Used Solutions

Swing check valves represent a prevalent choice in both water supply and wastewater systems. They are readily available and typically more affordable. These automatic valves depend on fluid flow direction for operation, completely negating the need for an external power source.

The swing check valve category includes several configurations:

Dual-Disc Check Valves

Featuring a wafer body design and dual D-shaped discs, these valves rotate out of the way as fluid enters, offering good non-slam characteristics. However, they should not be used in wastewater situations due to their vulnerability to vibration and wear.

Traditional Swing Check Valves

This familiar design typically features metal or resilient seats, with an angle of swing between 60 to 90 degrees. These valves are prone to slamming due to the long stroke it requires and can experience friction, which may affect performance over time.

Tilted Disc Check Valves

Unlike traditional models, the tilted disc allows fluid to flow on both sides of the disc, resulting in minimal head loss. However, they are not advisable for wastewater applications, as the pins can collect debris.

Choosing the right check valve involves a nuanced understanding of your system's dynamics. Consulting with an experienced engineer can unveil options leading to increased efficiency and reduced slamming risk. If you find yourself uncertain about your current check valve configuration, reach out to us! Our team is prepared to lend technical support to businesses and municipalities in the areas of Wisconsin, Minnesota, Illinois, and upper Michigan.

In addition, understanding the pressure testing methods and protocols is crucial to ensure the effectiveness of your check valves. Our team specializes in providing assistance with valve pressure testing equipment, ensuring that your systems run smoothly.

If you are in search of high-quality solutions, consider discussing your needs with a Valve Test Bench Manufacturer. Our experienced sales personnel can assist you in locating the perfect products that align with your operational requirements.