An ISO9001:2000 14000
A professionally managed organization, Ningbo Belt Pneumatic Machinery Co.,Ltd. Is a leading manufacturer and exporter of pneumatic fittings and hydraulic fittings.
Add:Ningbo,Zhejiang,P.R.China
Tel:+86-574-62244444
Fax:+86-574-62240179
http://www.pneumatic-esp.com
Email:sales@pneumatic-esp.com
Plug For A Hydraulic Fitting
A hydraulic or other type of high-pressure hose fitting can be temporarily sealed using a special type of plug. The plug is made of a rubber like material and can be used both as a male plug or a female plug. The plug contains a plug body with a tapered end portion that can be pushed into and seal against the tapered seat of a female hydraulic fitting. The plug also contains an internal open ended bore that can be pushed over a male fitting with the threads of the male fitting tightly pressing into the rubber material to form a seal and minimize the plug being blown off the fitting.
A plug adapted for insertion into a female hydraulic fitting and adapted to be fitted over a male hydraulic fitting, the plug being of unitary construction and having a solid hexagonal a head portion and a resilient body portion, the body portion being cylindrical and hollow and having one end attached to the head portion and an opposed end which is open and having an internal cylindrical open ended bore, the open end of the body portion containing an external inwardly tapering sealing face adjacent the open end of the bore and an internal outwardly tapering portion.
The plug as claimed in claim 7, wherein the elastomeric body portion is made of a nitrile rubber.
The plug as claimed in claim 8, wherein the entire plug is made of nitrile rubber.
The plug of claim 9, wherein the outer diameter of the body portion is selected from the following sizes: 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 23 mm, 24 mm, 27 mm, 30 mm, 32 mm and 34 mm, or the imperial equivalent.
The plug of claim 7, wherein the head portion contains an annular ring 13 formed with a sealing surface that presses up against the sealing surface in the female recess to enable the plug to be attached to the internal threads of the female fitting as well as providing a sealing action.
A plug adapted for insertion into a female hydraulic fitting and adapted to be fitted over a male hydraulic fitting, the plug comprising a head portion and an elastomeric body portion, the body portion being cylindrical and having an internal open ended bore which is also cylindrical, the open end of the body portion containing an external inwardly tapering sealing face adjacent the open end of the bore and an internal outwardly tapering portion.
The plug as claimed in claim 12, wherein the elastomeric body portion is made of rubber, and preferably a nitrile rubber.
The plug as claimed in claim 13, wherein the entire plug is made of elastomeric material.
A method of plugging a hydraulic fitting, the fitting containing external threads, the method comprising pushing a plug comprising a head portion and an elastomeric body portion, the body portion being cylindrical and having an internal open ended bore which is also cylindrical, the open end of the body portion containing an external inwardly tapering sealing face adjacent the open end of the bore and an internal outwardly tapering portion, over the fitting such that the external threads push against an internal wall of the open ended bore of the plug, thereby plugging the hydraulic fitting.
A method of plugging a female hydraulic fitting, the fitting containing an internal bore, the method comprising pushing a plug comprising a head portion and an elastomeric body portion, the body portion being cylindrical and having an internal open ended bore which is also cylindrical, the open end of the body portion containing an external inwardly tapering sealing face adjacent the open end of the bore and an internal outwardly tapering portion into the internal bore.
The method of claim 16, wherein the internal bore of the fitting contains a tapered seat, and the plug is pushed into the internal bore such that the external tapered portion on the plug presses against the tapered seat of the fitting.
In a broad form, the invention resides in a plug to plug a hydraulic fitting, the plug comprising an elastomeric body that can be stretched or pushed over a male fitting or pushed into a female fitting.
In another form the invention comprises a plug adapted for insertion into a female hydraulic fitting and adapted to be fitted over a male hydraulic fitting, the plug comprising a head portion and an elastomeric body portion, the body portion being cylindrical and having an internal open ended bore which is also cylindrical, the open end of the body portion containing an external inwardly tapering sealing face adjacent the open end of the bore and an internal outwardly tapering portion.
In another form, the invention resides in a plug to plug a female hydraulic fitting, the female hydraulic fitting containing a recess, an internal thread inside the recess, and a sealing surface in the recess, the plug comprising an elastomeric body adapted to be pushed into the recess, the body being compressible and resilient such that when the body is pushed into the recess, it engages at least partially with the threads in the recess to hold the plug in place, the plug containing sealing means to engage against and to at least partially seal against the sealing surface in the recess.
Thus, by providing an elastomeric body, the plug can be pushed into a female fitting and it does not particularly matter what type or pitch of thread is in the female fitting as the body will conform to the particular thread and be engaged thereby. The body can be pushed far enough in to seal against the sealing surface in the recess. Also, when removed, the plug does not have a formed thread and therefore can be reused many times on different types of fittings.
Therefore, the plug according to the present invention can function to protect the threads of the hydraulic fitting, as well as sealing against leakage of hydraulic fluid, and the engagement of the plug against the threads can be sufficient to enable some pressure in the line to be accommodated without the plug being blown out of the fitting.
In another form, the invention resides in a plug for a male fitting, the plug comprising a recess adapted to extend over the male fitting, the plug comprising a stretchable material to enable the plug to be stretched over the male fitting and then snugly engaged against threads of the male fitting. In this form of the invention, the recess may be provided with sealing means. Again, the material does not have a formed thread, and a thread is not cut into the material when the plug is fitted to the male fitting, and therefore the plug can be used many times on different types of fittings.
The plug may be of any size and shape to suit the particular fitting. The fitting may comprise a hydraulic fitting, a pneumatic fitting or even any other type of fittings where it is considered useful to use the plug which forms part of the present invention.
