US 5,469,884 AGranted

Check valve for meter run

AssigneeDurabla Pump Components, Inc.

InventorRonn G. Madrid

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Abstract

A fluid check valve for preventing back flow of fluid through a fluid conduit. The check valve is connected in series with a meter run to enable unrestricted normal flow to occur through a passageway in the valve body, and to prevent backflow. A throat forms the entrance into a passageway, and a valve seat is formed behind the throat. A valve cage mounts a valve element for movement within the passageway so that the valve element moves toward and away from the valve seat and during normal flow the valve element is spaced from the valve seat. Should any significant backflow commence, the valve element sealingly engages the valve seat to prevent the occurrence of such backflow. Downstream of the throat and seat there is a wall that enlarges outwardly and radially into a circumferentially extending slot having an outside diameter greater than the diameter of the passageway. The cage has a main central body part to which there is integrally attached a plurality of radially extending legs for attachment into the circumferentially extending locking groove to hold the cage in position within the passageway and to abuttingly engage the valve element.

Claims11

Dependent claims

A check valve for preventing back flow of fluid through a fluid conduit, comprising;

a main body having opposed parallel upstream and downstream faces;
said main body having an annular passageway through which flow can occur therethrough, means mounting said main body respective to a fluid conduit to enable flow to occur therethrough;
said annular passageway includes a throat forming an inlet thereinto, a working chamber, and an outlet;
said throat is of relatively small diameter and forms an entrance into said annular passageway at said upstream face, where the passageway enlarges into said working chamber which forms a circumferentially extending lip upstream thereof;
said lip having opposed walls with an outer wall thereof coinciding with said upstream face and said opposed wall being arranged parallel to said outer wall;
said opposed wall enlarges radially into a slot having an outside diameter greater than the diameter of said working chamber;
a valve element having a diameter greater than said throat, an annular seat formed on said lip downstream of said throat and within said annular passageway for receiving said valve element in seated relationship thereon, and thereby prevent back flow of fluid through said passageway;
a valve cage by which said valve element is mounted for axial movement within said working chamber, said valve cage having legs releasably received within said slot whereby said valve element is moved toward and away from said seat in response to pressure differential thereacross such that said valve element can move from an open to a closed position to engage said seat to prevent back flow through said check valve.

5 more elements

A check valve for controlling back flow of fluid through a meter run, comprising:

a valve body having an upstream face opposed to a downstream face, an annular passageway formed through said valve body and extending through the recited opposed faces;
a throat defines an opening into said passageway and includes an inwardly extending annular lip integral with said valve body and having a outer wall surface that coincides with said upstream valve body face and a rear wall surface that terminates in a circumferentially extending groove;
said groove having a relatively large diameter respective to said throat which has a relatively small diameter;
a working chamber located between said throat and said downstream face having an inside diameter of a value intermediate the diameter of said groove and said throat;
a valve element received within said chamber;
means forming a seat on said rear wall surface against which said valve element is seated in spaced relation respective to said throat and said circumferentially extending groove;
a cage in the form of a spider having a central body with a plurality of legs extending therefrom, each leg is bent into a configuration that includes outwardly extending spaced tabs, said tabs are received within said groove to removably mount said spider within said passageway;
said valve element is captured within said cage and has a front and a back;
and biasing means between the spider central body and the back of the valve element.

6 more elements

Dependencies are inferred from the claim text.