Product Specification
The check valve is usually in the closed position and opens when fluid flows through it. It also can shut down the flow if the pressure in the sliding direction is greater than the pressure in the rising direction. In this sense, they are used to flow in one direction only. Thus, they prevent flow back through the valve. Since the flow of liquid through the valve is allowed in only one direction. Check valves must be installed properly by observing the normal direction of flow. An arrow printed on the outside of the valve body indicates the direction of flow.
Types of Check Valve
Selecting the appropriate check valve requires careful consideration of the application's specific needs. Engineers must choose a valve that matches the type of media, pipe size, pressure gradient, fluid velocity, and pumping mechanism. Evaluating these factors is essential to ensure safe operation and to protect equipment.
Check valves come in a broad range, from standard models available at home improvement stores to custom designs tailored for specific applications. Given the constant development of new check valves, it's challenging to provide a comprehensive list. However, despite their variety, all check valves share certain common descriptive factors.
Advantages of Check Valves
- Prevent backflow
- Able to endure high and low pressure conditions
- Perform as a backup and safety system
- Able to be used horizontally and vertically
- Self-actuated
- Fast acting.
- Protect pumps and compressors from damage caused by backflow
- Reduce downtime and loss of production
- Prevent water hammer
- Reduce sudden valve failure
- Lower maintenance costs
- Few moving parts
- Smaller footprint
- Able to cope with variable flow conditions
- Do not require power to operate
Disadvantages of Check Valves
- Do not operate in pulsating systems
- Closing element can slam closed causing damage and wear
- Operate in a completely enclosed system
- Impossible to check if they are open or closed
- Internal parts cannot be checked
- Disks can get stuck in the open position.
- Noise from slamming discs
- Water hammer
- Reverse flow problems
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