Abstract: An improved filter arrangement solves problems associated with dislodging the filter from a support basket at change-out when intimate contact between the filter and basket is no longer desirable. An elastomeric end cap is bonded to the distal end of the filtering medium. The end cap has a circular, outer perimeter defining a diameter less than the inner diameter of the filter basket. The end cap is dome shaped, such that when the filtering element is inserted into the filter basket with the end cap positioned adjacent the bottom of the filter basket, the end cap assumes a pressurized state when a fluid entering the filtering element applies pressure to the end cap, causing the outer perimeter of the end cap to expand radially outwardly, and a non-pressurized state wherein the outer perimeter of the end cap contracts, facilitating an easier removal of the element from the basket.

Abstract: An improved filter arrangement solves problems associated with dislodging the filter from a support basket at change-out when intimate contact between the filter and basket is no longer desirable. An elastomeric end cap is bonded to the distal end of the filtering medium. The end cap has a circular, outer perimeter defining a diameter less than the inner diameter of the filter basket. The end cap is dome shaped, such that when the filtering element is inserted into the filter basket with the end cap positioned adjacent the bottom of the filter basket, the end cap assumes a pressurized state when a fluid entering the filtering element applies pressure to the end cap, causing the outer perimeter of the end cap to expand radially outwardly, and a non-pressurized state wherein the outer perimeter of the end cap contracts, facilitating an easier removal of the element from the basket.

Abstract: A reliable, cost effective system and method are disclosed for exchanging fluid-filtration filters associated with electrical discharge machines (EDMs) and other applications. The basic system comprises a housing to receive the filter, the housing having a top that opens and a bottom cap with an interior inlet fitting coupled to a supply line carrying fluid to be filtered. A pair of opposing swing arms, each having one end pivotally connected to a filter cabinet or other suitable base and another end pivotally connected to an opposing side of the housing, facilitate a first state, wherein the housing and filter are vertically oriented with the bottom opening of the filter sealed against the fitting for filtering operation, and a second state, wherein the housing is pivoted such that the top is oriented downwardly allowing the filter to disengage from the fitting and slide out of the housing.

Abstract: A reliable, cost effective system and method are disclosed for exchanging fluid-filtration filters associated with electrical discharge machines (EDMs) and other applications. The system is compatible with filters of the type receiving fluid to be filtered from the inside out. The basic system comprises a housing to receive the filter, the housing having a top that opens and a bottom cap with an interior inlet fitting coupled to a supply line carrying fluid to be filtered. A pair of opposing swing arms, each having one end pivotally connected to a filter cabinet or other suitable base and another end pivotally connected to an opposing side of the housing, facilitate a first state, wherein the housing and filter are vertically oriented with the bottom opening of the filter sealed against the fitting for filtering operation, and a second state, wherein the housing is pivoted such that the top is oriented downwardly allowing the filter to disengage from the fitting and slide out of the housing.

Abstract: A two-stage, retrofit filter is adapted for use with an electrical discharge machine (EDM) includes nested inner and outer filtering elements that may be placed as a unit in the same tank and over the apertured standpipe used for a one-stage filter, such that the fluid to be filtered now flows through each of the multiple filter elements. The retrofit EDM filter may be configured for flow in either direction, though the usual arrangement is one whereby the fluid being filtered flows up through the bottom of the tank, out the apertured standpipe, and into the inner filter element. Preferably, the filter elements are cylindrical, pleated elements composed of a technical grade filter paper. In the preferred embodiment, a pressure-operated release valve is provided in conjunction with the inner filter, such that when a predetermined pressure is reached due to the entrapment of contaminants by the inner filter, the valve opens to allow the fluid to be filtered to flow through the outer filter.

Abstract: A two-stage, retrofit filter is adapted for use with an electrical discharge machine (EDM) includes nested inner and outer filtering elements that may be placed as a unit in the same tank and over the apertured standpipe used for a one-stage filter, such that the fluid to be filtered now flows through each of the multiple filter elements. The retrofit EDM filter may be configured for flow in either direction, though the usual arrangement is one whereby the fluid being filtered flows up through the bottom of the tank, out the apertured standpipe, and into the inner filter element. Preferably, the filter elements are cylindrical, pleated elements composed of a technical grade filter paper. In the preferred embodiment, a pressure-operated release valve is provided in conjunction with the inner filter, such that when a predetermined pressure is reached due to the entrapment of contaminants by the inner filter, the valve opens to allow the fluid to be filtered to flow through the outer filter.