# US 5,707,041 A · Fluid control valve with fastener for ceramic valve plug

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- Number: US 5,707,041 A
- Document ID: US5707041A
- Status: Granted
- Kind: A
- Application number: 08/707,856
- Filed: 1996-09-09
- Granted: 1998-01-13
- Earliest claimed: 1996-09-09
- Assignees: Fisher Controls International LLC
- Inventors: Loren Lee Bovee; Gary Alan Witt; David J. Westwater
- Web page: https://patentgrep.com/patent/US5707041A

## CPC

- F16K 1/22: with axis of rotation crossing the valve member, e.g. butterfly valves
- 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 fluid control valve for use in severe erosive fluid conditions which includes a ceramic plug seat. The ceramic plug seat is mounted to a metal valve element using a tapered mechanical bolt. The tapered portion of the mechanical bolt matches a cone-shaped interior surface portion within the ceramic plug to uniformly distribute the mounting forces within the ceramic plug to prevent cracking of the ceramic plug.

## Claims

### Claim 1

In a fluid control valve, including a valve plug assembly having a rotatable valve shaft, a hub mounted at one valve shaft end, and a ceramic plug seat mounted to the hub and having a contoured plug seat surface, the improvement comprising:
a central bolt receiving aperture through the contoured plug seat surface and extending through the ceramic plug seat, said central bolt receiving aperture including a cone-shaped interior surface portion;
a threaded mounting bolt having a head and an elongated shank extending from the head, said shank including a threaded end portion for threadably engaging the hub and a tapered portion intermediate to the threaded end portion and the head, said tapered portion matching the cone-shaped interior surface portion within said ceramic plug seat to uniformly distribute mounting forces within the ceramic plug seat.

### Claim 2 (depends on 1)

The improvement of claim 1, wherein said threaded mounting bolt includes a socket head.

### Claim 3 (depends on 2)

The improvement of claim 2, including a ceramic cap insert into said central bolt receiving aperture in said ceramic plug seat to cover and seal said bolt socket head from the environment.

### Claim 4 (depends on 3)

The improvement of claim 3, wherein said ceramic cap engages said ceramic plug seat in an interference fit.