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| My chemical feed pump gets air bound at night, what’s wrong with my pump? |
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| More than likely, there isn‘t anything wrong with your pump. If you’re pumping a gaseous chemical such as sodium hypochlorite (bleach) or hydrogen peroxide, then you probably have gas forming inside the suction tubing or pump head. This gas is what’s locking up your pump and keeping it from pumping. In most situations, you can manually re-prime the pump and everything is fine for the time being. For a more permanent solution, you need a way to get that gas out automatically when you’re not around. |
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| Most of the solenoid driven diaphragm chemical feed pump manufacturers have addressed this problem and have developed ways to eliminate this problem. One of the most common devices is the multi function valve with degassing capabilities. LMI has a 4 function valve with bleed capabilities and Pulsafeeder has a 5 function valve with bleed capabilities. These multi function valves are mounted on the discharge side of the pump. The bleed valve is opened slightly to allow any gas and a small amount of discharge flow to pump back to the solution tank and automatically prime the pump. Pulsafeeder has developed a degassing head which bypasses the gas through a third valve port on the pump head and eliminates the need for a 5 function bleed valve. They currently have conversion kits for a limited number of Pulsafeeder models so depending on your pump model, this may or may not be an option. |
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| Depending on your application, Stenner offers a peristaltic pump that is ideal for feeding gaseous chemicals. The peristaltic design pushes the bubbles through the pump head and will not lose prime when pumping gaseous chemicals. |
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