# US 5,707,040 A · Replaceable seal members for butterfly valve

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- Number: US 5,707,040 A
- Document ID: US5707040A
- Status: Granted
- Kind: A
- Application number: 08/542,435
- Filed: 1995-10-12
- Granted: 1998-01-13
- Earliest claimed: 1995-10-12
- Assignees: Orbit Valve Company
- Inventors: Jerry Gasaway
- Web page: https://patentgrep.com/patent/US5707040A

## CPC

- F16K 1/2263: {the sealing being arranged on the valve seat}
- F16K 1/2261: {the sealing being arranged on the valve member}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

A butterfly valve having a valve body with a seat therein and a valve disc carried on a rotatable shaft such that the valve disc can be moved into and away from sealing engagement with the valve body seat is provided with a removable and replaceable seat member forming the valve body seat and a removable and replaceable sealing surface member is mounted on the valve disc which is sealingly engageable with the seat member when the valve disc is moved into sealing engagement with the valve body seat. The valve body seat preferably is sized to be press fit into a recess in the valve body and retained therein without additional fasteners. This butterfly valve can be used in a single, double or triple offset valve and the valve can be attached to a pipe in any conventional manner. The valve seat material and the sealing surface material may be solid metal, a resistant material such as nylon or Teflon.RTM., may have a metal insert or may have a high temperature insert such as graphite.

## Claims

### Claim 1

A butterfly valve having a valve body with a valve seat therein and a valve disc carried on a rotatable shaft such that said valve disc can be moved into and away from sealing engagement with said valve seat, wherein said valve seat comprises:
a removable and replaceable seat member having a frusto-conical shaped sealing surface and sized to be press fit into a recess in said valve seat and retained therein without additional fasteners; and
wherein said recess comprises a shoulder abutting said seat member on an axial surface thereof and said rotatable shaft is arranged on a side of said seat member opposite said shoulder, said seat member captured between said shoulder and said rotatable shaft.

### Claim 2 (depends on 1)

A butterfly valve according to claim 1, wherein said valve body is cylindrical and has a longitudinal centerline, and said frusto-conical shape, when projected to an apex, defines an apex point offset from said centerline of said valve body.

### Claim 3 (depends on 1)

A butterfly valve according to claim 1, wherein said seat member comprises a resilient material wherein said resilient material is selected from the group consisting of nylon, rubber and Teflon.RTM..

### Claim 4 (depends on 1)

A butterfly valve according to claim 1, wherein said seat member comprises solid metal.

### Claim 5 (depends on 1)

A butterfly valve according to claim 1, wherein said seat member comprises a metal insert.

### Claim 6 (depends on 1)

A butterfly valve according to claim 1, wherein said seat member comprises a high temperature insert consisting of graphite.

### Claim 7 (depends on 1)

A butterfly valve according to claim 1, wherein said seat member comprises a resilient insert wherein said resilient insert is a material selected from the group consisting of nylon, rubber and Teflon.RTM..

### Claim 8 (depends on 1)

A butterfly valve according to claim 1, wherein said valve disc comprises a removable and replaceable sealing surface member mounted on said valve disc which is sealingly engageable with said seat member when said valve disc is moved into sealing engagement with said valve seat.

### Claim 9 (depends on 8)

A butterfly valve according to claim 8, wherein said valve disc further comprises a retaining ring removably mounted to said valve disc, and wherein said retaining ring removably mounts said sealing surface member to said valve disc.

### Claim 10 (depends on 8)

A butterfly valve according to claim 8, wherein said valve disc further comprises a seal between said sealing surface member and said valve disc.

### Claim 11 (depends on 10)

A butterfly valve according to claim 10, wherein the seal is a gasket in contact with the sealing surface member and the valve disc.