The Performance of Farmington expansion Cv Plugs
The Farmington Cv Plug consists
of two pieces, which arrive pre-assembled, a plug body and a ball.
The body is a cylindrical cup shaped part with a number of grooves
on its outside diameter. The expansion Cv Plug is placed
into an as drilled counterbore in the product. The ball is then driven
into the plug until the ball and the plug body are flush with each
other. Expansion causes grooves of the plug to "bite" into
the surrounding material forming independent seals and retaining rings.
The end result is a 100% reliable, leak and trouble proof seal for
both gas and liquid applications. Our plugs have solved a number of
difficult hydraulic sealing problems, and have led our customers to
develop the most reliable, leak proof products in their respective
industries. The Farmington Cv Plug is the easiest and most reliable
method of sealing drilled holes for critical high and low pressure
applications. Millions of our plugs are at work in the field, in use
in automotive, aerospace, and other heavy industries that require
an easy, simple and 100% effective leak proof seal.
Farmington Engineering
Cv Plugs are unique solutions to a common problem faced by engineers:
How do you 100% seal high and low pressure holes in manifolds or other
applications ?
| OLD
SEALING METHODS |
PROBLEMS |
| Pipe Plugs |
1. Spiral
leak paths formed during installation
2. Require time consuming machining
3. Require addition of sealants to threads to get a sure seal.
4. Danger of sealants contaminating other system components. |
| Threaded Plugs
with Gasket |
1. Requires
costly machining of holes.
2. Require time consuming deburring.
3. Requires accurate surface finish for gasket.
4. Simple scratches or tooling marks cause leak paths. |
| Dowel Pins |
1. Dowel
pins will leak.
2. Costly machining needed to accept press fit components.
3. Galling.
4. Requires accurately controlled hole dimension. |
| Steel Ball |
1. Pressing
steel in hole may lead to leaks from incomplete seal.
2. Material may gall, causing leaks.
3. Not removable.
4. Requires accurately controlled hole dimensions. |
| Soldering
or Welding |
1. Very expensive
2. Time consuming process to cut metal patch for hole.
3. Leakages and subsequent removal may lead to scrapping an entire
assembly.
4. Less than 100% effective. |
Why expansion Cv Plugs are better then conventional plugging techniques?
- expansion Cv Plugs offer
a 100% leak proof reliable seal even at elevated pressures up to 45,000
psi.
- The very forgiving design
of the Cv Plugs allows installation into as-drilled holes with loose
tolerances up to +0.004" above the nominal plug size.
- expansion Cv Plugs are
available in a wide range of materials and sizes; including English,
Metric, and Short length plugs, which are easily fitted into any design
requirement and offer material compatibility to all housing materials.
- The installations of Cv
Plugs are also easily automated to further reduce your assembly costs.
- Cv Plugs are the most
cost effective and reliable method of sealing drilled passageways.
- The plug body acts as
a gasket between the housing material and the ball expander. The sealing
surface between the hole and the plug is never compromised by any
axial movement during installation.
- All other methods require
critical machining, the use of sealants, or time-consuming assembly
techniques. Despite all of these conventional efforts a high probably
of leakage will still occur. Cv Plugs are the only way to reliably
plug and seal holes.
Cv Plug Advantages
Over Pin-Type Expansion Plugs
1. Use As-Drilled Holes
Cv Plugs represent a superior
design concept using steel balls to expand a cup-shaped metal plug into
a hole. The grooves on the outside diameter of the Cv Plug are forced
to penetrate the walls of the hole material causing a mechanical lock
and a hydraulic seal capable of withstanding extremely high working
pressures. Ball type expansion plugs are superior to competing tapered
pin designs for several reasons. When Cv Plugs are installed the ball
gradually swages one groove at a time into the walls of the hole material.
When tapered pin expansion plugs are installed, the tapered pin contacts
the tapered inside diameter of the plug and expands the entire plug
at once. The pin type plug is limited in the amount of expansion by
the excessive forces required to expand the plug. The low expansion
pin plugs, therefore, require closely controlled reamed holes. Ball
type plugs are able to incorporate more expansion, because the work
of expansion is done over a greater distance resulting in a lower installation
force (work equals force times distance). The overall result is that
higher expansion Cv Plugs can perform in "as drilled" holes
with wider diameter tolerances. High pressure hydraulic systems can
be built with easy to machine -0/+.004 inch diameter holes.
2. One Piece Design
Cv Plugs are one piece designs,
whereas pin type expansion plugs are two piece designs that have to
be assembled by the installer. This process is time consuming and not
cost effective.
3. Forgiving Installation
The ball in a Cv Plug is
more forgiving to mis-aligned installation tools than is a pin plug.
A pin plug, if not pushed with a perfectly perpendicular installation
tool will cause the expansion pin to gall and its motion will be frozen.
The pin type expansion plug then has to be machined out of the hole
and another installation attempted.
4. High Pressure Performance
expansion Cv Plugs have been
demonstrated to have higher proof pressures more consistently than pin
type expansion plugs.
