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Патент USA US2110481

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March 8, 1938.
Filed Nov. 15, 1935
2 Sheets-Sheet l
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Milil'ch 8, 1938.
,Filed Nov. 15, was
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’ Patented
8, 1938
j . ._ 12,110,481"
um'rsn s'rnras' PATENT orifice;
B. Crockcn'StragoI-d, 0cm, usignor,
meme -
- Moore, Inco
Duration of New JerseyNew York,
Y., a core
‘Application Novemberll3, 1935, Serial No. 49,541 .
This invention pertains to valves,
(01. 1374s‘)
and relates ‘
more particularly to an improved'valve seat and
cooperating valve feather. While the novel con
a rz: ‘:‘v |
the above-mentioned - desirable ‘
Other objects are
struction herein disclosed is of more general util
5 ity, it- is particularly designed with reference to
to provide at‘valve' havingv
which, at the
relief 'valves intended automatically to open in
response to a predetermined ?uid pressure and
for use in places where the ?uid medium is a gas,
for example, cool air. For such uses it has been
In the accompanying drawings wherein one de
sirable embodiment of the invention is illustrated
by way of example, but without intent thereby to
10 found in practice that a leak-tight contact be
tween the valve seat and feather is di?icult to
make or maintain since the slightest imperfection
in machining parts or the lodgment of dust, lint,
scale, or other foreign matter between the valve
15 feather and seat permits leakage of the gaseous"
Ithas heretofore been proposed to make one of , ‘
the contact surfaces, that is to say, either the
feather or the seat surface, of a yieidable resilient
20 material, for example, rubber, in order to avoid'
the necessity for extreme accuracy in machining
the parts and to compensate for foreign matter
which may lodge between the surfaces. How~
ever, as heretofore applied, such resilient material
25 has substantial
disadvantages. For example,
resilient materials (characteristically like rub
her) have a. tendency to stick tov the opposed
metal surface under conditions of use,_it being
apparent that the relief valve may, under some
circumstances, remain closed for a long period of
time, during all of which the resilient material
is held under substantial pressure against the
limit the applicability of the principle of the in
'Fig. 1 is a vertical cross-sectional view of a .
relief valve em
.the present invention;
- Fig. 2 is a side elevation showing the valve
feather removed from the valve casing;
Fig. 2* is a fragmentary elevation, partly inver
tical section, showing~ details of the guide por
tion of the valve feather;
. ‘
Fig. 2b is a bottom‘ plan view of ‘the top member
of the valve feather; ,
Fig. 3 is a fragmentary vertical section. to
scale, of the upper portion of- the
member of the valve ‘casing, showing details of
the improved seat;
Fig. 4- is a fragmentary vertical section illus
trating the relative positions of the parts ‘when ~
the valve feather is fully loaded and resting on
the seat;
Fig. 5 is a similar fragmentary section, but
showing the relative positions of the valve feather 30
and seat at the instant of popping: and
opposing metal surface. Such sticinng of the
Fig. 6 is a fragmentary section illustrating the ‘
parts introduces an element of uncertainty into
35 the operation of the valve, the reluctance of the invention as applied to a different type of valve,
valve parts to separate acting, in e?ect, as an with the feather and the seat in the same relative
additional but indeterminate load, thus some~ position as shown in Fig. 5.
For convenience in description the'present in
times delaying the opening of thevalve beyond
. the danger point.
vention is herein illustrated as embodied in a ‘
Furthermore, the ready yielding of the resilient
material, when used for example as a seat sur- , '
face, response to the pressure of the feather, varies the shape and effective area of the surface‘ ent constructions and types. ~
exposed to the ?uid- pressure, so that the spring
Referring to the drawings, the numeral l
4‘ calculations based upon the theoretical size of designates the base portion of the valve casing,
the ,opening through the seat are not reliable. '
here shown as provided with the screw-threaded 45
On the other hand, it is highly desirable that nipple 2 by means of which the casing may be
the relief valve shall pop at a clearly de?ned ?xed in position withrespect to a container for
pressure and have a predetermined blow-down pressure ?uid. The upper part 3‘ of the base
50 with a sharp closing action, and that it retain member I is shaped to provide an annular valve
these characteristics throughout a long period of '
, use. The principal object of the present 'inven
tion is to provide a substantially leakproof relief
55 valve for. use in particular with air or other gas
seat, hereinafter more fully described, such seat
being located at the upper end of and concentric
with the passage II through which the pressure
?uid escapes from the container when the valve is
opened. A valve feather 5, hereinafter more fully 55 I. ‘I
described, cooperates with‘the seat to prevent
is provided with a cylindrical upstanding guide
eseapeof?uidundernormal eonditions.. 'lhe upper'portion of the base member I is ex-'
?ange II‘. In this. instance the washer 2| is
the under surface of the valve
ternallyscrew-threaded at! for engasementlwith
the‘lower part of the bonnet ‘I. ‘This bonnety‘l-
feather i! by the head 2' of a screw 21 which
has screw-threaded enmement with a bore- in
eempnses the hollow top portion I which houses
the feather r.
bevariedifdesired bymeanlofthe
> I
‘' surfaces”
member 2|_,-as'
2! indenttheruilientwasber
‘tedinFlgJJndthus pro_-
vide a fluid-tight closure even, for such?uids as~ Ill
air or other'gas whose molecules are very small
and which tend, when under- high pressure, to
passthroughthemostminuteerevices. Bincethe
rsillent washer is indented at spaced points by
in a'cavity i4
the seat surfaces 28 and 24, the material of the
washer between these surfaces ‘is crowded to-'
the normal blowing pressure,
the valve;
with a - preferred
of the invention. the valve feather comprisesva
‘ guide portion I8 (Figs. 2, 2- and'5) which extends down into the ?uid-escape passage I, such
'ency for the resilient material to flow outwardly
and away- from the contact'surface than though
I but'a single ‘seat member ,were qnployed.
As the pressure beneath the valve feather rises
and Swim thevopping point,_the compres
' - sive
strel! nfthe
an effective
in assisting thefinally
fluid becomes
provided with woman:r
theload ofthe spring,and even- .
the valve feather retreats sufficiently from
_ the valve seat ‘to free the outer seat surface 2i
' from contact with the resilient washer. At about
. ' ns
I this time some leakage commences between the
washer and-the inner seat surface '28, and such
guide portion
with a screw-
fluid as escapes over the inner rib enters the con
' ?ned space ‘provided by the groove 2' beneath the
overhanging part ,of the valve feather, and reacts
bore II, which receives a
screw-threaded. plug ll projecting downwardly
against the larger area of the valve feather to
from the .center of the feather I. The lower sur - give. a huddling chamber effect commonly em
face ofvthe‘feather I is provided with a- shallow, ' ~ployed in steam safety valves to insure a sharp
2. (Fig. 2") concentric with‘ the
opening. In this particular instancethis huds
feather and adapted to hold a
- to stick to the resilient washer,
ftive pressure of the ?uid in the huddling chamber
synthetic rubber or rubber combined with other
for example, fiber so as somewhat to
increase its resistance to compression or distor
tion. 'lhe upper end 22 (li'lg.v 2‘) of-the guide
portion is substantially flat and when the feather
and its guide portion are assembled. the washer >
2| is firmly clamped against the‘surface 22.
The valve seat, in accordance with the- present
illustrated by "
invention, and as here specifically
plurality of spaced '
way of example, comprises a
concentric annular ribs whose free upper edges
actually form the valve seat. As shown, this seat
(Fig. 3) comprises the inner surface 22 and the
becomes operative to overcome this sticking and
insure a clean and quick separation of the parts.
It is thus assured that although the seat bears
against resilient material to prevent leakage, -
‘nevertheless, at the popping pressure, the valve
will open without danger of sticking,-the hud
dling chamber action, resulting from the employ- I
ment of the spaced seat surfaces, assisting in this
quick, sharp openingand in providing for an‘
effective blow-down effect.
While but two of the concentric seat surfaces
are here illustrated, it is to be understood that ai
greater number might be employed if desired, and -
20, these surfaces beingseparated
while certain desirable arrangements for holding
by the annular recess 25. - In accordance with
the resilient material in place are described, it is
to be understood that other and equivalent means
fall within the scope of the invention.
, outerv surface
55 the preferred construction, the seat surface 23 is
in a plane somewhat higher than the seat surface
24, so that when the valve feather moves toward
itsnormal closed position, the washer 2| engages
‘ It is also contemplated that somewhat similar
effects might be produced with a reverse ar
the seat surface 23 beforegtouching the seat sur
rangement of the parts, that is to say, one in
which a substantially flat seat surface, of resilient
The surfaces 23‘ and 2!
‘material would coact with the spaced annular
when the valve feather rests upon them they will rigid engaging surfaces carried by the valve
collectively provide sufficient surface areato sup
port the maximum load of the spring at the pres
65 sure at whichv the valve is set, while providing a
?uid-tight contact between the resilient washer
1 2| and the respective seat surfaces. It is obvious
that when the valve‘feather is seated, the inner
seat surface 23 will indent the resilient material
of the washer 2| ‘more deeply than does the outer
feather. A further equivalent construction fall
ing within the scope of the invention comprises
resilient ribs meeting‘ with' a substantially-?at
rigid surface. It is further contemplated that
any suitable yielding, plastic or resilient material
may be employed in accordance with the require 70
ments of each individual case, and that the in
~vention is not to be limited to any particular _ '
I dimensions and is considered to include all equiv
seat surface 24.
In Fig. 6 a slight modification is illustrated, alents of the materials and arrangements here
wherein the valve feather 5‘ instead of having a in specifically described.
guide portion which slides in the ?uid passage 4_,
While, for convenience inv description, such
terms as “top”, “bottom”, "upper”, “under”, etc., ‘ said valve having a casing including a base mem
have been employed, it is to be understood that ber having a ?uid passage terminating at an an
these terms are used only in a relative sense, and nular seat concentric with ‘the passage, a valve
not as words of limitation.
feather cooperable with the seat to stop the ?ow
I claim:
of pressure ?uid through the passage, said feather 5 _
comprising a guide member which slides in the
?uid passage thereby to center the valve feather
relatively to the seat, the lower surface of the
1. A spring-loaded pressure-actuated relief
valve designed to pop automatically at a de?nite
n predetermined pressure and to have a predetere
mined blow-down, said valve having a casing, a ,
movable .val-ve feather within the casing, said
yieldable contact
spaced concentric substantially rigid annular ribs
whose free edges both engage the resilient contact
surface of the feather when the valve is closed,
the space between the ribs constituting a hud
dling chamber, the outer rib being lower than
the other, whereby as the pressure beneath the
valve feather nears the popping point, pressure
?uid leaking past the inner rib into the huddling
chamber between the ribs reacts against the
overhanging part of the valve feather so as to
free the feather and ensure sharpopening.
2. A pressure-actuated automatic relief valve
comprising a movable valve feather and yieldable
loading means normally operative to hold the
feather in valve-closing position, ‘said ‘feather
having a resilient and yieldable seat contacting
element, and a valve seat cooperable with the
valve feather, said seat comprising parts spaced
to provide a huddling chamber between them
and being so designed and arranged that when
the valve is closed one of said ‘parts of the seat
indents the resilient contact element of the
channel within which is housed a resilient annu- 10
removably clamped against the lower surface of
the feather, the seat surface comprising a pair
of annular ribs spaced to provide a huddling
chamber between them, the upper edges of the 15
ribs being of such vwidth as collectively to provide
suiiicient surface areato support the maximum
load imposed upon the valve feather, the inner
rib being of greater height than the outer rib, '
and a spring loading the feather so that both 20
ribs ‘normally ‘indent the washer.
4. A pressure-actuated relief valve designed to
said valve having a casing including a base mem- 25‘
passage, a
valve feather cooperable with the seat to stop the
member coaxial with the feather, means normally 30 _
by to
the feather
of the feather
with respect
seat, annular channel therein, a washer of rubber- 35
like resiliency seated in said channel with its
feather more deeply than does the other of said ‘ marginal
parts of the seat, whereby as the ?uid pressure
nearly approaches the predetermined opening
pressure the resiliency of the yieldable contact
element assists the ?uid pressure in overbalancing
the loading means andthe less deeply indented
portion of the contact element separates from
the seat before the valve actually opens so that
leakage of pressure ?uid into the huddling cham
ber ensures a sharp opening of the valve and
complete separation of the feather from the seat.
3. A pressure-actuated relief valve designed to
pop automatically at a de?nite predetermined
pressure and to have a. predetermined blow-down,
spaced to provide a huddling chamber between 40
annular washer, the inner rib being of greater 45
height than the outer rib, and 'yieldable loading
means so loading the feather that both ribs nor
mally slightly indent the washer.
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