Check valve for large conduits

• US 4,067,356 A
• Filed: 10/14/1975
• Issued: 01/10/1978
• Est. Priority Date: 10/19/1974
• Status: Expired due to Term

• Current Assignee: Alfred Kreuz
• Original Assignee: Alfred Kreuz
• Inventors: Kreuz, Alfred
• Primary Examiner(s): Cline, William R.
• Application Number:
  US05/622,381
• Time in Patent Office: 819 Days
• Field of Search: 137/527, 137/527.2, 137/527.4, 137/527.6, 137/527.8, 137/543.17, 137/543.19, 137/219, 251/298, 251/219, 251/228
• US Class Current: 137/527
• CPC Class Codes: F16K 1/12 with streamlined valve member around which the fluid flows when the valve is opened
• CPC Class Codes: F16K 15/033 spring-loaded
• CPC Class Codes: Y10T 137/7898 Pivoted valves
• CPC Class Codes: Y10T 137/7901 Valve head movably connected for accommodation to seat
• CPC Class Codes: Y10T 137/7903 Weight biased

Abstract

A check valve for large conduits having a stationary, rearwardly open hollow valve core mounted inside an enlarged-diameter portion of the housing bore, a matching dish-shaped valve poppet carried by a pivot lever closing the forward end of the valve core in the open valve position in which the valve poppet is spaced a short axial distance from the valve seat, so that a rapid closing action is obtained, as soon as an incipient reverse flow enters the hollow valve core.

Claims

1. A check valve comprising in combination:

an elongated, generally tubular valve housing, the housing bore having an axial inlet end and an axial outlet end adapted for connection to matching openings of a pipe system;

a valve seat defined by a radially inwardly narrowed midportion of the housing bore, in a plane transverse to the housing axis;

an enlarged-diameter bore portion in the housing immediately behind the valve seat;

a hollow stationary valve core positioned coaxially inside the enlarged-diameter bore portion, so as to form an annular flow channel therewith, the valve core having an open forward end facing the valve seat at an axial distance behind it and an open rearward end of a diameter which occupies a substantial portion of the housing bore, thereby forming an inner flow channel through the core, for a reverse flow;

a generally dish-shaped valve poppet arranged in the axial space between the valve seat and the forward end of the valve core, the valve poppet being movable between a normal open position in which it is seated against the forward end of the valve core, thereby covering said open end in the manner of a lid, and a closed position in which it is seated against the valve seat, following a closing motion resulting from a reverse flow of liquid through said inner flow channel; and

means for guiding the valve poppet in its motion between the open and closed valve positions; and

wherein

the valve poppet guide means includes an elongated pivot lever engaging with one lever extremity the valve poppet and with the other lever extremity a fixed outer pivot point which is located radially outside the housing bore, so that the valve poppet is guided to execute a short arcuate motion approximating a straight-line axial motion between its open and closed positions; and

the valve housing includes a closed, laterally extending head for the accommodation therein of said fixed pivot point of the pivot lever.

2. A check valve as defined in claim 1, wherein

the valve poppet and the pivot lever extremity by which it is engaged form an inner pivot connection parallel to the outer pivot connection of the valve lever;

and

the open forward end of the valve core and the valve seat are located in parallel planes.

3. A check valve as defined in claim 2, wherein

the valve poppet includes a rearwardly extending central hub;

the pivot lever is constituted by two laterally spaced arms engaging said hub on opposite sides thereof with the aid of pivot members; and

the valve core has matching slots for the accommodation of the pivot lever arms.

4. A check valve as defined in claim 2, wherein

the relationship between the length of the pivot lever and the axial displacement of the valve poppet is such that a closing motion of the latter corresponds to approximately six degrees angular motion of the former.

5. A check valve as defined in claim 1, wherein

the valve poppet has a dome-shaped axially protruding contour presenting a flow-parting nose in the direction of the valve seat.

6. A check valve as defined in claim 5, wherein

the pivot lever and the valve poppet are so designed that their combined center of gravity is positioned a distance downstream of a radial plane through the outer pivot point, when the valve poppet is in the closed position.

7. A check valve as defined in claim 5, wherein

the valve poppet guide means further includes a spring engaging the pivot lever so as to urge the valve poppet towards its closed position.

8. A check valve as defined in claim 1, wherein

the valve core has a smaller diameter at its rearward end, the core having the shape of a hollow frustum.

9. A check valve as defined in claim 8, wherein

the valve core is attached to the housing by means of fins extending radially across said annular flow channel between the valve core and the housing wall.