Located between the compressor and the air receiver tank or main header, a check valve is designed to prevent air from bleeding out of the tank or header and back into the inlet line when a compressor shuts down. Unloader valves, meanwhile, allow air to bleed out of the compressor line to reduce load on startup.
Do check valves work for air?
The primary role of a check valve is to control air flow within an air compressor system. In the case of your compressor, the check valve controls the flow of air between the pump and the tank. The valve is self-regulated, which means that it relies on the directional flow of air to open and close.
How do I know if check valve is bad?
Symptoms of a Failing Check Valve
For example, failing check valves will start to vibrate and even lose some internal parts when problems begin to arise. Other symptoms of check valve failure include reverse flow and excessive component wear and damage. Check valves will also emit noises as they start to break down.
How do you know if your air compressor valve is bad?
High Discharge Pressure
If the discharge pressure from your reciprocating air compressor is exceedingly high, the problem is possibly due to an instrument error or a faulty unloading valve. Alternately, the discharge level could be due to exceeding high demand on the system.
What happens when compressor valves fail?
When a compressor’s valves go bad, the system will overwork itself to the point that it begins overheating. This can lead to serious issues and damage to other parts of your system. The longer it goes on, the more likely you are to experience electrical issues inside of your HVAC unit as well.
Does a check valve go before or after a pump?
On booster pump applications, a check valve can be placed on the suction or discharge of a centrifugal pump. If an additional check valve is required, it should be placed after the pressure tank to allow the pump and discharge pipe to remain pressurized.
Where should a check valve be installed?
The check valve must be installed at the outlet of the pump and in front of the outlet control valve for maintenance. Generally, the first outlet of the pump is the soft connection (shock absorber), the next is the check valve, and then the block valve.
What is the difference between a spring check valve and a swing check valve?
A swing check valve uses a flapper that ‘swings’ off the seat to allow forward flow and then swings back onto the seat when the flow is stopped. In contrast, a spring loaded check valve incorporates a spring to assist in closing the valve. Learn more about spring check valves!
What happens if the check valve goes bad?
Typical check valves only allow fluids to flow in one predetermined direction. And if they fail, you will have problems because the liquid or gas will flow where it is not supposed to.
How often should a check valve be replaced?
While typical component lifespans are application specific, manufacturers suggest metal and plastic check valves should be replace every 5-7 years whereas check valves manufactured from rubber may remain fully serviceable for up to 35-50 years.
Can a check valve get clogged?
Debris in pipeline — Debris in the piping can get lodged in the check valve, causing it to remain stuck in the open or closed position. Plus, rapidly traveling debris can affect the one-way check valve and damage the internal mechanism.
What causes compressor valves to fail?
Some mechanical causes of compressor valve failure are: Spring failure: A wear down of the spring attached to the valve, due to stress could cause the improper functioning of the valve. High-cycle fatigue: The compressor’s operation at high cycles over a long time can lead to stress which could affect the valve.
