Dual plate check valve

• US 8,844,563 B2
• Filed: 10/04/2011
• Issued: 09/30/2014
• Est. Priority Date: 07/20/2011
• Status: Active Grant

• Current Assignee: Hawa Valves (India) Private Limited
• Original Assignee: Hawa Valves (India) Private Limited
• Inventors: Hawa, Javed Anwar
• Primary Examiner(s): Rivell, John
• Assistant Examiner(s): BARSS, KEVIN R
• Application Number:
  US13/252,688
• Publication Number:
  US 20130019966A1
• Time in Patent Office: 1,092 Days
• Field of Search: 137/511, 137/512, 137/512.1, 251/284, 251/285, 251/286
• US Class Current: 137/512.1
• CPC Class Codes: F16K 1/22 with axis of rotation crossing the valve member, e.g. butterfly valves
• CPC Class Codes: F16K 15/03 with a hinged closure member or with a pivoted closure member
• CPC Class Codes: F16K 15/038 having a common hinge
• CPC Class Codes: Y10T 137/7837 Direct response valves [i.e., check valve type]
• CPC Class Codes: Y10T 137/7839 Dividing and recombining in a single flow path
• CPC Class Codes: Y10T 137/7898 Pivoted valves

Abstract

A check valve in which a stop pin assembly is situated so as to prevent the movement of a flapper beyond a predetermined position. In a preferred embodiment the check valve has two flappers with the stop pin assembly situated therebetween to prevent either one of them from pivoting beyond an essentially vertical position. The stop pin assembly is configured such that it can be inserted and locked in place when the check valve is inserted within a valve body that contains the check valve. The stop pin assembly can comprise three elements including a central portion and first and second end portions, although the stop pin assembly could instead comprise a single element. The stop pin assembly is inserted between two holders and in a preferred embodiment is rotatable to a locking position where it is affixed in place by fasteners.

Claims

1. A disk assembly for a check valve, comprising:

an axle pin coupled between first and second holders;

first and second flappers pivotally coupled to said axle pin; and

a stop pin assembly coupled between said first and second holders, said stop pin assembly including;

a stop pin having a center element and a first end element, said first end element including a pin portion extending through said first holder; and

said stop pin being lockable in place between said first and second holders,

wherein the center element has two end section with flat sides; and

the first and second holders each have a slot with a flat-sided top portion and a generally circular bottom portion, such that when oriented properly, the flat sides of the center element can slide through the flat-sided top portions of the slots and into the circular bottom portions.

2. The disk assembly of claim 1, wherein said stop pin further includes:

a second end element, said second end element including a shaft portion extending through said second holder.

3. The disk assembly of claim 1, wherein said stop pin further includes:

a second end element, said second end element including a shaft portion extending through said second holder.

4. The disk assembly of claim 3, wherein said first end element, said center element, and said second end element comprise three distinct, cooperating elements.

5. The disk assembly of claim 3, wherein said first end element, said center element, and said second end element comprise a single unitary piece.

6. A dual plate check valve, comprising:

a disk assembly, comprising;

an axle pin coupled between first and second holders;

a first flapper pivotally coupled to said axle pin;

a second flapper pivotally coupled to said axle pin; and

a stop pin assembly coupled between said first and second holders, said stop pin assembly including;

a stop pin having a center element, a first end element, and a second end element, said first end element including a pin portion extending through said first holder and said second end element including a pin portion extending through said second holder;

wherein

said stop pin is lockable in place between said first and second holders and prevents each of said first flapper and said second flapper from pivoting beyond a predetermined position

wherein the center element has two end sections with flat sides; and

the first and second holders each have a slot with a flat-sided top portion and a generally circular bottom portion, such that when oriented property, the flat sides of the center element can slide through the flat-sided top portions of the slots and into the circular bottom portions.