Swing check seal assembly

• US 3,870,071 A
• Filed: 01/16/1974
• Issued: 03/11/1975
• Est. Priority Date: 01/16/1974
• Status: Expired due to Term

• Current Assignee: Donald E. Graham, Larry A. Battaglia
• Original Assignee: Donald E. Graham, Larry A. Battaglia
• Inventors: Graham, Donald E., Battaglia, Larry A.
• Primary Examiner(s): Cline, William R.
• Application Number:
  US05/433,760
• Time in Patent Office: 419 Days
• Field of Search: 251/366,367,174,176,177,170 137/527,527.2,527.4,527.6,527.8,375,268
• US Class Current: 137/527
• CPC Class Codes: F16K 15/03 with a hinged closure member or with a pivoted closure member
• CPC Class Codes: Y10T 137/7898 Pivoted valves
• CPC Class Codes: Y10T 137/7903 Weight biased

Abstract

The disclosure is of a swing check valve wherein the valve clapper is a dished spherical section with a conical sealing surface at its periphery engageable with a complementary conical seat surface. There are various seat ring embodiments with means to facilitate the accomodation of the conical surfaces of the clapper and the seat to each other despite some slight misalignments thereof and without an undue amount of play between the clapper shaft and its support.

Claims

1. In a swing check valve comprising:

a housing having a pair of flow passageways therein;

a valve clapper in said housing;

means pivotally mounting said clapper in said housing adjacent one of said flow passageways;

an annular sealing surface on said clapper;

a seat ring floatingly mounted in said body around said one passageway for limited axial and radial movement therein;

a complementary surface on said seat ring engagable by the sealing surface of said clapper;

a resilient seal ring carried on the leading surface of said seat ring;

means associated with said seat ring for providing yieldable sealing forces between said seal ring and said sealing surface when engaged, said means providing a lesser sealing force at portions of said seat ring adjacent said pivotable mounting and a greater sealing force at portions of the seat ring displaced therefrom; and

retainer means holding said seat ring on said body.

2. The combination defined by claim 1 including:

a carrier ring on said body having a complementary conical surface thereon;

said seat ring being movably carried on said carrier ring;

spring means biasing said seat ring outward of the conical surface on said carrier ring; and

a second resilient seal ring carried on the inner surface of said seat ring and engaging said carrier ring.

3. The combination defined by claim 1 including:

a carrier ring on said body around said one flow passageway;

an external spherical surface on said carrier ring generated about a center on the axis thereof;

a complementary internal spherical surface on said seat ring engaging on said external surface; and

means sealing between said spherical surfaces.

4. The combination defined by claim 1 wherein said means providing yieldable sealing forces comprise:

spring means engaging around said seat ring and biasing it outward in sealing engagement with said clapper in closed position;

certain of said spring means engaging that portion of said seat ring adjacent said pivotal mounting means asserting less spring force than other spring means at portions of said seat ring displaced therefrom.

5. The combination defined by claim 4 wherein:

said certain spring means are weaker than said other spring means.

6. The combination defined by claim 4 wherein:

said certain spring means are spaced farther apart than said other spring means.