|
|
· Home  · Products · Generalities
The butterfly valve has won its own place
in the contemporary world, as it is a basic component in the
majority of industrial installations.
Its advance and use are due both to the studies and
technological improvements in its materials (mainly the
Elastomers) and to the characteristics of adaptability within the activities where a simple, efficient solution is
required. |
The SIGEVAL butterfly advantages:
- Minimum load loss.
- Permanent and total watertightness, both inside and outside.
- Bi-directional flow.
- Easy assembly and disassembly, with all the components
interchangeable.
- Hardly any maintenance.
As can be seen, the valve is basically composed of a
body, shafts, a disc and an elastomer sleeve to make it
water-tight.
Body.- This is of metal and can be manufactured in various
alloys according to its use and the work for which it is
required.
Shafts and Disc.-These form a unit with an overall movement
and are manufactured from suitable materials according to
the fluids with which they may make contact and they are
selected from a wide range (covered and treated cast iron,
stainless steel, special alloys, etc.).
The disc is machined in a spherical form to achieve a
reduction in torque required by the valve and greater
duration of the elastomer sleeve.
Sleeve.-The composition of the elastomer sleeve is
determined according to the temperature, resistance and
service conditions imposed by the circulating media. lt
insulates the interior of the body and ensures
watertightness inside and outside the valve, at the service
pressure required.
|
|
 |
(A) - Bushings
The multifunctional dual-bushings ensure alignment of the shafts as well
as reducing the torque. Together whit the packing bushing give
additional safety preventing internal leakage and external contamination.
(B) - Body Design
The long-neck construction allows easy installation and provision for
insulation. The top bottom alignment lugs make mounting between PN 10/16
and ANSI 150 flanges very easy.
(C) - Spherical Disc
The edge of the disc, in contact whit the seat, is totally spherical
providing smooth operation and considerable reduction of the valve
torque. The combination of the valve tightness and reduced friction,
especially around the shafts, gives a three fold increase in the life
span of the seat.
(D)- Interchangeability
All valve components can be dismantled and the replaceable parts are
interchangeable whit other types from the SIGEVAL range. |
|
(1) - Zegi ring
(2) - Washer
(3) - Bushing
(4) - “O” sealing ring
(5) - Body
(6) - Upper Shaft
(7) - Liner
(8) - Disc
(9) - Lower Shaft
(10) - Cap |
|
|
|
|
|
