Abstract: Provided is a check valve assembly including a check valve having a body and a stem having at least one radially inwardly deflectable member having an end with a radially outwardly projecting catch, and a valve shield retained on the stem between the body and the end of the at least one radially inwardly deflectable member by the radially outwardly projecting catch. In this way, a mechanical bond is provided between the check valve and the valve shield, thereby eliminating the need to clean the body of the check valve to remove contaminants to allow an adhesive to hold the check valve to the valve shield.

Abstract: Provided is a check valve assembly including a check valve having a body and a stem having at least one radially inwardly deflectable member having an end with a radially outwardly projecting catch, and a valve shield retained on the stem between the body and the end of the at least one radially inwardly deflectable member by the radially outwardly projecting catch. In this way, a mechanical bond is provided between the check valve and the valve shield, thereby eliminating the need to clean the body of the check valve to remove contaminants to allow an adhesive to hold the check valve to the valve shield.

Abstract: The present invention provides a technique using current sensing to control the pressure at constant level without the direct sensing of the pressure. This technique will help to reduce dependency solely on switch or sensor and their non linearity and other associated problems such as the non-repetitive behavior, being affected by EMI etc. The technique includes using a pump controller featuring one or more modules configured to respond to one or more input signals containing information about current provided from a pump; and configured to provide one or more output signals containing information to control the pump to operate at a substantially constant pressure without the direct sensing of pump pressure. The one or more modules control the operation of the pump based at least partly on a table of characteristics related to voltage and current that is calibrated for each pump.

Abstract: The present invention provides a technique using current sensing to control the pressure at constant level without the direct sensing of the pressure. This technique will help to reduce dependency solely on switch or sensor and their non linearity and other associated problems such as the non-repetitive behavior, being affected by EMI etc. The technique includes using a pump controller featuring one or more modules configured to respond to one or more input signals containing information about current provided from a pump; and configured to provide one or more output signals containing information to control the pump to operate at a substantially constant pressure without the direct sensing of pump pressure. The one or more modules control the operation of the pump based at least partly on a table of characteristics related to voltage and current that is calibrated for each pump.

Abstract: The present invention provides a technique using current sensing to control the pressure at constant level without the direct sensing of the pressure. This technique will help to reduce dependency solely on switch or sensor and their non linearity and other associated problems such as the non-repetitive behavior, being affected by EMI etc. The technique includes using a pump controller featuring one or more modules configured to respond to one or more input signals containing information about current provided from a pump; and configured to provide one or more output signals containing information to control the pump to operate at a substantially constant pressure without the direct sensing of pump pressure. The one or more modules control the operation of the pump based at least partly on a table of characteristics related to voltage and current that is calibrated for each pump.