Effervescent gas bleeder apparatus

Abstract

A diaphragm metering pump suitable for metering an effervescent gas. The pump has a pump head with a product chamber having an inlet end with a one-way inlet valve and an outlet end with a one-way outlet valve. A displaceable diaphragm member defines a boundary of the product chamber. The diaphragm member is capable of being reciprocated to cause pumping displacements. A discharge side is disposed downstream from the outlet valve. A passageway is disposed in fluid communication between the discharge side and the product chamber. A valve is disposed in the passageway. The valve is opened intermittently to allow liquid to re-enter the product chamber in an amount effective to purge gas from the product chamber to prevent loss of prime.

1 . A diaphragm metering pump, comprising: 
 a pump head including a product chamber having an inlet end with a one-way inlet valve and an outlet end with a one-way outlet valve;    a displaceable diaphragm member defining a boundary of the product chamber, the diaphragm member capable of being reciprocated to cause pumping displacements;    a discharge side disposed downstream from the outlet valve;    a passageway in fluid communication between the discharge side and the product chamber;    a valve disposed in the passageway; and,    wherein the valve is manually controlled.    
     
     
         2 . A diaphragm metering pump, comprising: 
 a pump head including a product chamber having an inlet end with a one-way inlet valve and having an outlet end with a one-way outlet valve;    a displaceable diaphragm member defining a boundary of the product chamber, the diaphragm member capable of being reciprocated to cause pumping displacements;    a discharge side disposed downstream of the outlet valve;    a passageway in fluid communication between the discharge side and the product chamber;    a valve disposed in the passageway, the valve being controlled such that it opens on an intermittent basis to allow liquid to re-enter the product chamber in an amount effective to purge gas from the product chamber to prevent loss of prime; and,    wherein the valve is manually controlled.