Valve with improved junk ring structure

Valves and valve actuation – Rotary valves – Butterfly

Reexamination Certificate

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Details

C251S361000

Reexamination Certificate

active

06726177

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a valve with an improved junk ring structure, and especially to an improved junk ring structure of which two screw threads (or multiple screw threads) with an identical screwing direction are provided respectively on both the screw thread portions of the main body and the junk ring, so that the valve can have the effect of being assembled firmly and conveniently, and the threads respectively of the main body and the junk ring can be formed on a lathe simultaneously to reduce the number of times and the cost of production. Thereby, the practicability as well as convenience of the valve can be largely increased, and the junk ring structure can suit the structures of valves or the like.
2. Description of the Prior Art
In industrial application, valves always have their important position, a conventional valve is comprised of a main body
10
, a valve disk
11
, a washer
12
and a junk ring
13
(referring to
FIGS. 1
,
2
). Wherein, an axle
15
is provided on the main body
10
to movably connected with an upper and a lower pivotally connecting block
111
of the valve disk
11
, and the main body
10
is provided on a recessed surface on one side thereof with four screw holes
101
. The junk ring
13
is provided on a surface in correspondence with this side with four screw holes
131
. And a plurality of screws
132
are used to firmly connect by screwing these members. The washer
12
is provided between the main body
10
and the junk ring
13
to control rotation of the valve disk
11
for opening or closing of the valve disk
11
, to thereby make communication or blocking between two pipes
14
on the two sides of the main body
10
.
However, such a structure has the following defects in manufacturing and using:
1. By virtue that the main body and the junk ring have screw holes mutually correspondingly arranged with intervals, when it is to lock by screws, angular adjustment is required; and the washer provided between the main body and the junk ring has elastic restoration capability, it will elastically stretch out when being compressed. Thereby, when the junk ring is locked in position, it will protrude outwardly rather than is flush with the periphery of the main body; when the pipes are forced to close to each other, the slightly protruding washers will be pressed to make damage of the screw threads.
2. By virtue that the main body and the junk ring have screw holes arranged with intervals on the round surfaces near the peripheries of themselves, the screw holes can not be made in one time, other machines with the required means for making these holes are needed to process separately, the manpower and the cost of production are accordingly increased.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide a valve with an improved junk ring structure, wherein, by connecting of the thread portions of the main body and the junk ring, the valve can have the effect of being assembled firmly and conveniently; thereby, the practicability of the valve can be largely increased.
The secondary object of the present invention is to provide a valve with an improved junk ring structure, wherein, the threads respectively of the main body and the junk ring can be formed on a lathe simultaneously to reduce the number of times and the cost of production.
To obtain the above stated objects, the present invention is composed of a main body, a valve disk, a washer and a junk ring, an internal axle of the main body is mounted thereon the valve disk, the main body is provided on the round surface near the periphery thereof with the washer which is fixed by pressing the assembled junk ring. The main body is provided on one side thereof with a stepped surface of which the outermost end has a screw thread portion on the inner wall thereof; the junk ring is provided on the outer wall of the periphery thereof with a screw thread portion mating with that of the main body. After the two screw thread portions are locked with each other, a front micro gap and a rear micro gap are left. The valve can have the effect of being assembled firmly and conveniently, and the threads respectively of the main body and the junk ring can be formed on a lathe simultaneously to reduce the number of times and the cost of production. Thereby, the practicability of the valve can be largely increased.


REFERENCES:
patent: 3156445 (1964-11-01), Swain
patent: 3250510 (1966-05-01), Williams
patent: 4371146 (1983-02-01), Mese et al.
patent: 4770393 (1988-09-01), Hubertson
patent: 5620167 (1997-04-01), Habicht

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