[0001] This invention relates to tight shutoff butterfly valves, and particularly to such
valves having a corrosion-resistant resilient liner.
[0002] In butterfly valves designed for tight shutoff, it has been common to employ a cast-metal
valve body which is provided with a resilient liner of some suitable material such
as an elastomer, halocarbon polymers, and the like. A disk having a sealing fit with
the liner is attached to a shaft, the shaft being rotatable about its axis and extending
through the body and liner transversely to the axis of the body. German Auslegeschrift
No. 1,290,395 discloses a valve of this kind wherein the liner has integral ring-shaped
flanges seating on ring-shaped rebates in the valve body.
[0003] Typically, the body castings of these prior art valves have been provided with a
boss on the body to which is attached an automatic or manual valve actuator.
[0004] Such cast-body valves are expensive and cumbersome to manufacture, because the casting
must ordinarily be inspected visually or by X-ray methods for flaws, the flaws welded,
and the body machined on various surfaces with the attendant generation of substantial
amounts of scrap metal shavings.
[0005] The invention comprises a butterfly valve to be installed between pipeline flanges
and secured by flange bolts, comprising a cylindrical body ring having a cylindrical
bore and a face portion at each end of the body ring; a corrosion-resistant, resilient
liner covering the cylindrical bore and integrally projecting radially outwards along
the face portions completely around the bore for a limited distance; a shaft rotatable
about its longitudinal axis extending through the body ring and the liner transversely
to the axis of the body ring; a disk attached to the shaft within the body ring and
liner and having a sealing fit with the liner; and at least one face plate, characterised
in that the body ring is formed from a section of pipe or tubing; the said at least
one face plate is formed from a metal thinner in the axial direction that the portion
of the liner projecting over a corresponding face portion of the body ring and has
an opening that circumscribes the said liner portion; and the said at least one face
plate has a tab that extends radially outwards from the body ring, the tab providing
means for mounting an actuator on the assembled butterfly valve body; whereby, when
the butterfly valve is installed between pipeline flanges, the portion of the liner
projecting over the said face portion of the body ring is compressed between the said
face portion and a pipeline flange to form a flange seal and the said at least one
face plate is isolated from the bore of the body ring, the extent of such compression
being limited by the thickness of the said at least one face plate.
[0006] Preferably, the tab on the face plate includes cut-out portions for pipeline flange
bolts whereby the valve may be centred between the flanges.
[0007] In a preferred construction, two face plates are provided, one on each side of the
valve body ring, each plate having an annular ringlike portion and first and second
tab portions. The annular ringlike portion of each face plate has an inner diameter
slightly larger than the outer diameter of the face portions of the valve liner, and
each plate is thinner in the direction of the valve body ring axis than the face portions
of the liner. The tab portions of these plates extend radially outwardly from the
body ring and the first tab portion provides means for mounting an actuator, manual
or automatic, to the assembled valve.
[0008] A valve according to this invention is assembled into a pipeline by mounting between
two conventional pipe flanges, the flange bolts fitting around the outside of the
valve body ring and the face plate tabs extending between two of the bolts. When the
flange bolts are tightened, each of the liner face portions is compressed between
a side of the body ring and a pipe flange to effect a seal therebetween. The compression
of the liner face portions is limited by abutment of the pipe flange against the annular
portion of the face plate, to prevent damage to the liner face portion. The tightened
flange bolts rigidly clamp the face plates between the pipe flanges and the valve
body ring. An actuator mounted on the first tab portions of the face plates is maintained
in a fixed position relative to the valve shaft by the immobile face plates.
[0009] Attention is now directed to the drawings, in which:
FIG. 1 is an exploded view of a butterfly valve according to this invention; and
FIG. 2 is a sectional view of the valve of FIG. 1, taken at line 2-2.
FIG. 3 is a sectional view of the valve of FIG. 2 showing the valve installed between
conventional pipe flanges with an actuator mounted on the face plates.
[0010] Referring now to Figure 1 an exploded view of a butterfly valve of this invention
is shown. A cylindrical valve body ring 10, made of a rigid material, has a resilient
liner 12, a layer of elastomer, vulcanized or bonded to the body ring 10 such that
the liner 12 covers the cylindrical bore of the body ring 10 and extends outwardly
from the body ring bore to cover a portion of each of the end faces of the body ring
10 to form two annular flange-like liner face portions 13. The valve body ring 10
is adapted to receive a rotary valve shaft 16 transverse to the axis of the body ring
10. On the valve shaft 16, within the valve body ring 10, is retained a closure member
or valve disk 14, which may be made from a metallic material, such as stainless steel
or bronze, or a nonmetallic material such as glassfiber reinforced plastic, to be
chemically and physically resistant to the fluid which is to flow through the valve.
The valve disk 14 has an enlarged portion 15 through which the valve shaft 16 extends.
The valve disk 14 is fixedly retained on the valve shaft 16 by taper pin 18 which
is inserted into aligned tapered holes 19 in the valve shaft 16 and the enlarged portion
15 of valve disk 14. The two ends of the valve shaft 16 extend through two holes 24,
formed diametrically opposite each other through the liner 12 and body ring 10, to
the exterior of the valve body ring 10. One end of the valve shaft 16 is adapted to
engage a rotary valve actuator, for example, by splines 17 shown on valve shaft 16
or by a groove and key (not shown). Within the holes 24 the valve shaft 16 is supported
by bearing bushings 22 which may be formed of a low friction fluorocarbon resin. In
conventional tight-shutoff rubber lined valves it is common for the rubber sealing
member to be fitted into the valve body. The valve body confines the internal line
pressure while the rubber sealing member provides for tight shutoff. Similarly, it
has been common to require packing within each aperture in the valve body to prevent
leakage of fluid from the interior of the valve to the exterior. In the valve of this
invention, the liner 12 is designed to resist line pressure with the body ring 10
acting as a back-up ring to provide structural rigidity. Additionally, the internal
diameter of the cylindrical liner 12 of the valve of this invention is sized for an
interference fit with the valve disk 14 whereby the resilient elastomer liner 12 sealingly
engages the periphery of the valve disk 14 when the disk is rotated to a position
transverse to the axis of the body ring 10. An interference fit is also formed between
the elastomer liner 12 and the valve shaft 16 which forms a seal to prevent fluid
leakage through the holes 24. No separate sealing member has been shown; however,
a seal for example, an o-ring, may be used within holes 24 to prevent fluid leakage
through the holes 24. The relative physical positions of these valve pieces may be
more easily understood by examination of Figure 2 which shows a cross-sectional view
of the butterfly valve of this invention taken along the sectional line 2-2 in Figure
1.
[0011] Referring to Figure 1 again, a pair of face plates 30 are provided. Each face plate
30 has an annular ring-like portion 31, with an inner diameter slightly larger than
the outer diameter of the face portion 13 of valve liner 12, and first and second
tab portions 32 and 34. The first tab portions 32 of the face plates 30 extend radially
outwardly from the ring-like portion 31 of the face plates 30 and provide a means
for mounting an actuator to the assembled valve. An example of an actuator mounting
means is shown in Figures 1 and 2 wherein the first tab portions 32 of each of the
face plates 30 are extended radially outwardly, and parallel one another, from the
ring-like portion 31 a short distance where they then are sloped toward one another
before bending to form parallel facing planar portions terminating in ears 33 which
extend away from one another at about a right angle from the planar area.
[0012] An actuator may be attached to the ears 33 by use of bolt holes 36. Many other attachment
configurations would serve equally well. A second tab portion 34 extends from the
ring-like portion 31 of the face plate 30 diametrically opposite the first tab portion
32. The second tab portion 34 of each of the face plates 30 extend radially from the
ring-like portions 31 of the face plates 30 and are then bent at about a right angle
toward one another to extend, externally of the valve body ring 10, parallel the axis
of the valve body ring 10. The two second tab portions 34 approach each other at the
exterior of the valve body ring 10 to retain the second end of the valve shaft 16
for reasons of safety. Should the valve shaft 16 fracture in service, the actuator
retains one end of the valve shaft 16 within the valve body ring 10 while the second
tab portions 34 prevent outwardly longitudinal movement of the second end of valve
shaft 16.
[0013] As shown in Figure 2, each face plate 30 is thinner in the direction of the valve
body ring 10 axis than the face portions 13 of the valve liner 12. Also, as noted
above, the inner diameter of the ring-like portion 31 of face plate 30 is slightly
larger than the outer diameter of the face portion 13 of valve liner 12. When the
valve is assembled, as shown in Figure 2, a gap 20 is left between the ring-like portion
31 of face plate 30 and the face portion 13 of valve liner 12.
[0014] Referring now to Figure 3, the butterfly valve of Figures 1 and 2 is shown in a sectional
view, mounted between conventional pipe flanges 41 which are held together by flange
bolts 42. Additionally, an actuator 40 is shown bolted to the ears 33 which extend
from the first tab portions 32 of the face plates 30. Here a manual actuator 40 is
shown; however, any rotary valve actuator, manual or automatic, may be used with this
valve. The outer diameter of the ring- like portion 31 of face plates 30 is sized
so that flange bolts 42 will fit around the outside of face plate 30 with only a small
clearance; thus, the flange bolts 42 center the butterfly valve between the pipe flanges
41. The second tab portion 34 of the face plates 30 is sized such that, when the assembled
valve is installed in a pipeline by mounting the valve between conventional pipe flanges
41, the second tab portion 34 extends between two of the flange bolts 42. The first
tab portions 32 of face plates 30 include cutout portions or holes 35 through which
the pipeline flange bolts 42 extend to aid in centering of the valve between the line
flanges 41.
[0015] When the assembled valve is installed in a pipeline between two conventional pipe
flanges 41, as shown in Figure 3, tightening of the flange bolts 42 forces the pipe
flanges 41 against the protruding elastomer of the liner face portions 13 and the
elastomer is axially compressed to form a flange seal until further compression is
prevented by abutment of the pipe flanges 41 against the face plates 30. Tightening
of the flange bolts 42 also rigidly clamps the face plates 30 between the pipe flanges
41 and the faces of the valve body ring 10, resulting in the face plates 30 being
immobile relative to the valve body ring 10 and thereby providing a stationary support
for an actuator 40.
[0016] Thus, there has been provided by the present invention a simple inexpensive lined
butterfly valve in which the actuator mounting structure is made separately from the
valve body. The face plates which support the actuator are made separately from the
valve body, thus the valve body ring is cut from a section of the pipe or tubing which
are inexpensive and readily available rather than requiring a heavier, more expensive
casting. A resilient lining is provided within the valve body ring for tight shut-off.
1. A butterfly valve to be installed between pipeline flanges (41) and secured by
flange, bolts (42), comprising a cylindrical body ring (10) having a cylindrical bore
and a face portion at each end of the body ring; a corrosion-resistant, resilient
liner (12) covering the cylindrical bore and integrally projecting radially outwards
along the face portions completely around the bore for a limited distance; a shaft
(16) rotatable about its longitudinal axis extending through the body ring and the
liner transversely to the axis of the body ring; a disk (14), attached to the shaft
within the body ring and liner and having a sealing fit with the liner; and at least
one face plate (30), characterised in that the body ring (10) is formed from a section
of pipe or tubing; the said at least one face plate (30) is formed from a metal thinner
in the axial direction than the portion of the liner (13) projecting over a corresponding
face portion of the body ring and has an opening that circumscribes the said liner
portion; and the said at least one face plate (30) has a tab (32) that extends radially
outwards from the body ring, the tab providing means for mounting an actuator (40)
on the assembled butterfly valve body; whereby, when the butterfly valve is installed
between pipeline flanges, the portion of the liner projecting over the said face portion
of the body ring (10) is compressed between the said face portion and a pipeline flange
(41) to form a flange seal and the said at least one face plate (30) is isolated from
the bore of the body ring, the extent of such compression being limited by the thickness
of the said at least one face plate.
2. A butterfly valve according to Claim 1, wherein the tab (32) on the said at least
one face plate (30) includes cut-out portions (35) for pipeline flange bolts (42)
whereby the valve may be centred between the flanges (41).
1. Drosselklappenventil, das zwischen Pipeline-Flanschen (41) eingebaut werden und
durch Flanschschrauben (42) gesichert werden soll, mit einem zylindrischen Ringkörper
(10), der eine zylindrische Bohrung und einen Stirnbereich an jedem Ende des Ringkörpers
hat; einem korrosionsbeständigen, elastischen Futterstück (13), das die zylindrische
Bohrung bedeckt und sich einstückig radial auswärts entland der Stirnbereiche völlig
um die Bohrung herum für einen begrenzten Abstand erstreckt; einer um ihre Längsachse
drehbaren Welle (16), die sich durch den Ringkörper und das Futterstück quer zur Achse
des Ringkörpers erstreckt; einer Scheibe (14), die an der Welle innerhalb des Ringkörpers
und des Futterstücks angebracht ist und dichtschließend in das Futterstück paßt; und
mindestens einer Stimplatte (30), dadurch gekennzeichnet, daß der Ringkörper (10)
aus einem Abschnitt eines Rohres oder einer Röhre gebildet ist; die mindestens eine
Stirnplatte (30) aus einem Metall, das in axialer Richtung dünner ist als der Bereich
des Futterstückes (13), das sich über einen entsprechenden Stirnbereich des Ringkörpers
erstreckt, gebildet ist und eine Öffnung hat, die den Bereich des Futterstückes (13)
umschreibt; und die mindestens eine Stirnplatte (30) eine Nase (32) hat, die sich
radial auswärts vom Ringkörper erstreckt, wobei die Nase eine Einrichtung zum Anbringen
eines Betätigungsorganes (40) an dem zusammengesetzten Drosselklappenventilkörper
liefert; wodurch wenn das Drosselklappenventil zwischen Pipeline-Flansche eingebaut
ist, der Bereich des Futterstückes (13), der sich über den Stirnbereich des Ringkörpers
(10) erstreckt, zwischen dem Stirnbereich und einem Pipeline-Flansch (41) zusammengepreßt
wird, um eine Flanschdichtung zu bilden, und die mindestens eine Stirnplatte von der
Bohrung des Ringkörpers isoliert ist, wobei das Ausmaß eines solchen Zusammenpressens
durch die Dicke der mindestens einen Stirnplatte begrenzt ist.
2. Drosselklappenventil nach Anspruch 1 dadurch gekennzeichnet, daß die Nase (32)
an der mindestens einen Stirnplatte (30) ausgeschnittene Bereiche (35) für Pipeline-Flanschschrauben
(43) aufweist, wodurch das Ventil zwischen den Flanschen (41) zentriert werden kann.
1. Vanne papillon destinée à être montée entre des brides de pipeline (41 ) et fixée
par des boulons (42), comprenant un corps cylindrique (10) ayant un alésage cylindrique
et une partie faciale à chaque extrémité du cylindre; une garniture élastique, résistant
à la corrosion (12) recouvrant l'alésage cylindrique et radialement en saillie vers
l'extérieur le long des parties faciales en entourant totalement l'alésage sur une
distance limitée, un arbre (16) pouvant tourner autour de son axe longitudinal et
s'étendant à travers le corps cylindrique et la garniture transversalement à l'axe
du corps cylindrique; un disque (14) fixé à l'arbre à l'intérieur du corps cylindrique
et de la garniture et monté de façon étanche dans celle-ci et au moins une plaque
frontale (30), caractérisée en ce que le corps cylindrique (10) est constitué d'un
tronçon de tuyau ou de conduite; ladite plaque frontale (30) est constituée d'un métal
d'épaisseur plus faible dans la direction axiale que la partie (13) de la garniture
en saillie sur une partie faciale correspondante du corps cylindrique et comporte
une ouverture qui limite ladite partie de garniture; et en ce que ladite plaque frontale
(30) comporte und patte (32) qui s'étend radialement vers l'extérieur à partir du
corps cylindrique, la patte constituant un moyen de montage d'un actionneur (40) sur
le corps de la vanne papillon assemblée, à la suite de quoi, lorsque la vanne papillon
est installée entre des brides de pipeline, la partie de la. garniture en saillie
sur ladite partie faciale du corps cylindrique (10) est comprimée entre cette partie
et une bride de pipeline (41) de façon à former un joint et la plaque frontale (30)
est isolée de l'alésage du corps cylindrique, la valeur d'une telle compression étant
limitée par l'épaisseur de la plaque frontale.
2. Vanne papillon selon la revendication 1, caractérisée en ce que la patte (32) de
ladite plaque frontale (30) comprend des parties découpées (35) pour recevoir des
boulons (42) de brides de pipeline, ce qui permet de centrer la vanne entre les brides
(41).