Swing check valves use a hinged swinging disc to block and control the movement of fluid in a system. As they are used to prevent the reverse flow of fluids or gases, any failure can lead to leakage, loss of pressure, contamination, overflow, and, in the most severe cases, complete system failure.
Pressure Fluctuations: A failing check valve can cause fluctuations in pressure within a system, which may lead to hydraulic shock (water hammer) and damage to pipes and fittings. Increased Maintenance: Frequent failures may require more maintenance and inspections, leading to increased operational costs and downtime.
Some common problems that you may encounter with flow control valves in your home include uneven hot water distribution, slow running, leakage and hot water backflow. Sometimes, flow control valves become jammed due to various reasons.
Debris can be deposited in the check valves by fluids moving through the pipeline, causing the valve to get stuck in an open or closed position.
A metal disc pivots on a hinge or trunnion to prevent reverse flow. Most larger-scale check valves use this design due to their simplicity. With a life span of five to seven years, these valves are often a component that needs to be replaced frequently.
This test, also known as a bubble test, is usually performed in a valve shop by applying air to the downstream side of the check valve while the upstream side is submerged in water; then, the number of bubbles is counted and the data is compared to specific acceptance criteria.
A check valve, also known as a non-return valve or one-way valve, allows the fluid to flow in only one direction. It is designed to prevent backflow, the reverse flow of fluids in a pipeline, and ensure the unidirectional fluid flow in the piping system.
You must have a check valve in most cases because when the pump shuts off there's water in the line that will drain back into pump basin and activate the pump again, then pump stops and the cycle repeats. This will eventually burn up your pump.
If your check valve isn't correctly triggering the pressure switch to turn the pump on or off, then you're immediately going to have low water pressure issues.
You'll need to take the valve out and disassemble it to look for debris and scratches. Wash all the parts with hydraulic fluid or whatever fluid is used in your pipe system. Check the housing for corrosion, damage or a rough surface. Buffing can help take care of rough surfaces.
For example, check valves that are starting to fail will vibrate or make a noise indicating that the valve has broken. A strange noise can also be a sign of 'water hammer' which is a high-pressure surge that occurs when the fluid comes to a stop or changes direction, often causing the disc to slam into the valve.
Common check valve problems include noise (water hammer), vibration/chattering, reverse flow, sticking, leakage, missing internals, component wear or damage. However, it is worth mentioning that normally the real cause is the wrong size, spring, and/or style for the check valve application.
Water hammer: A failed or leaking check valve can cause a vacuum to form in the piping due to pressure in the piping being lower than atmospheric pressure.
Step 1: Using a vice or an adjustable wrench, screw off and remove the check valve cap. Step 2: Once you get the cap removed, inspect the O-ring, cap and spring inside for any damage, wear or debris. Replace the spring as it is inexpensive and easy to do.
Check valves are fluid control devices that restrict the flow of media in a piping system to one direction.
While some check valves may last for many years without needing replacement, others may require more frequent maintenance or replacement due to wear and tear, corrosion, or failure.
A check valve will be used commonly on the discharge of the pump to prevent backflow from the downstream system, when the pump shuts off. Check valves are also used to prevent contaminated media in branches from flowing back into the main trunk line.
Low suction or poor pick-up may be due to a clog in the vacuum cleaner. If you notice a change in the sound of the motor or a reduction in the spinning action, check for clogs. First, remove the Easy Empty dirt tank from the vacuum and discard all dirt and debris.