CA1168550A - Check valve - Google Patents

Check valve

Info

Publication number
CA1168550A
CA1168550A CA000383089A CA383089A CA1168550A CA 1168550 A CA1168550 A CA 1168550A CA 000383089 A CA000383089 A CA 000383089A CA 383089 A CA383089 A CA 383089A CA 1168550 A CA1168550 A CA 1168550A
Authority
CA
Canada
Prior art keywords
valve element
fluid
check valve
guide body
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000383089A
Other languages
French (fr)
Inventor
Robert B. Goodman
James T. Triba
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
United Technologies Corp
Original Assignee
United Technologies Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US19103780A priority Critical
Priority to US191,037 priority
Application filed by United Technologies Corp filed Critical United Technologies Corp
Application granted granted Critical
Publication of CA1168550A publication Critical patent/CA1168550A/en
Application status is Expired legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D27/02Surge control
    • F04D27/0207Surge control by bleeding, bypassing or recycling fluids
    • F04D27/0215Arrangements therefor, e.g. bleed or by-pass valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D27/02Surge control
    • F04D27/0207Surge control by bleeding, bypassing or recycling fluids
    • F04D27/023Details or means for fluid extraction
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16KVALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00Check valves
    • F16K15/02Check valves with guided rigid valve members
    • F16K15/06Check valves with guided rigid valve members with guided stems

Abstract

Check Valve Abstract A low pressure drop check valve includes an apertured, streamlined guide body and a streamlined poppet or valve member disposed within a housing. Forward flow through the valve unseats the valve member, thereby allowing flow around the valve member and guide body. Reverse flow is accommodated by the apertures in the guide body, flow through the apertures being applied to a surface of the valve member, thereby seating the valve member for block-ing such reverse flow. The check valve is also provided with means for minimizing valve member oscillation and bounce.

Description

1 ~8S5~

Description Check Valve Technical Field This invention relates generally to fluid check valves and more specifically to such check valves adapted for use in a compressor bleed flow system in a gas turbine engine.

Background Art It is a common practice to bleed compressor discharge air from the compressor section of a gas turbine engine employed as a propulsion means for jet aircraft. Air is bled from the compressor to prevent surgé of the engine during starting and acceleration conditions, for heating the aircraft cabin and for warming wing sections and other surfaces of the aircraft to prevent icing thereof. Systems for bleeding air from the compressor discharge typically employ check valves which prevent reverse flow through the systems which would occur, for example, when the bleed systems from multiple engines communicate with one another and one of the engines becomes inoperational. Without reverse flow checking, such a condition would cause air bled from operational engines to flow to any inoperational engine, thereby interfering with the performance of the auxilliary heating equipment referred to hereinabove. The check valves employed in such bleed systems must be capable of passing air at pressures in the neighborhood of 300 psi at temperatures of about 800~F and must be capable of rapidly closing under reverse flow conditions.
Prior art compressor bleed check valves have typically been of the flapper variety. However, such flapper valves are characterizied by a minimum of valve element bearing area in comparison to the flow area of the valve.
Such lack of bearing area militates asainst the durability H9 ~ EC

1 16855~

of the valve, causing premature wear of the valve seats due to fluttering impact between the valve and the seats. Examples of a prior art flapper type compressor bleed check valve are found in U.S. Patent No. 2,925,825 to Staiger. While various other one-way or check valves are known in the prior art, such valves often define flowpaths therethrough which are restricted, tortuous or otherwise contribute to undesirable pressure drop through the valve, U.S, Patent Nos. 2,927,604 to Johnson and

2,928,417 to suckner et al are illustrative of alternate prior art check valve arrangements. While U.S. Patent No, 3,134,394 to Ohta illustrates a check valve having lower pressure drop characteristics than other of the check valves discussed hereinabove, it is believed that the check valve of the present invention represents significant advances in pressure drop characteristics and rapid rever~e flow checking over the Ohta valve.
Disclosure of Invention It is therefore an object of the present invention to provide an improved check valve having a valve element supported on bearings of substantial area where-in flutter and wear through fluttering impact are minimized.
It is another object of the present invention to provide an improved check valve wherein the flow through the valve is characterized by minimal restrictions and a generally non-tortuous flowpath.
It is another object of the present invention to provide an improved check valve wherein the pressure drop across the valve is minimized.
It is another object of the present invention to provide an improved check valve characterized by rapid but controlled checking under reverse flow conditions, In accordance with a particular embodiment of the invention, there is provided a fluid check valve. The 1 1~8550 -2a-valve includes a housing, defining an oute~ portion of a fluid channel and a seat disposed within the housing.
A valve element is positionable within the housing by fluid flow therethrough, the valve element, by applica-tion thereto of reverse fluid flow being held inengagement with the seat for closing the check valve and, by application of forward fluid flow thereto, being unseated for opening the check valve. An apertured guide body is disposed within the casing and defines, with the valve element under conditions of normal fluid flow, an inner wall of the fluid passage, The apertures accommodate reverse flow therethrough for application of the reverse flow to the valve element for seating the valve element and closing the check valve. The check valve is character-ized by the guide body being mounted within the interior of the housing by a plurality of spaced struts. Each of the struts is disposed between the housing and guide body and extends in directions defined by directional components both radially outward from and tangential to the guide body.
In accordance with a fuxther embodiment of the invention, there is provided a fluid check valve The valve includes a housing, defining an outer portion of ~25 a fluid channel and a seat disposed within the housing.
A valve element is positionable within the housing by fluid flow therethrough, the valve element, by applica-tion thereto of reverse fluid flow being held in engagement with the seat for closing the check valve and, by application of forward fluid flow thereto, being un-seated for opening the check valve. An apertured guide body includes leading and trailing apertured, streamlined faces and is disposed within the casing and defines, with the valve element under conditions of normal fluid flow, an inner wall of the fluid passage The apertures -2b-accommodate reverse flow therethrough for application of the reverse flow to the valve element for seating the valve element and closing the check valve. me check valve is characterized by the valve element comprising a concave shell, forward fluid flow through the valve impinging on an exterior face of the v lve element unseating the valve element such that the lead-ing guide body face is received at least in part in-teriorly of the valve element.
The above and other objects which will become more apparent from the following detailed description taken :,,;,.. ..

in connection with the appended claims and accOJnpanying drawings are achievea by the check valve of the present invention which is provided with an apertured aerodynamic - guide body and an aerodynamic poppet or valve member dis-posed within a housing such that in forward flow condition~, the valve element and guide body define a streamlined center body which, with the valve housing, define a flow passage of generally constant cross sectional area there-along. Reverse flow through the valve is accommodated by the apertures in the guide body, the reverse flow being applied to an expansive concave surface of the poppet which rapidly seats under the influence of the reverse flow, thereby blocking flow through the valve. A dampîng piston and sleeve arrangement is received within the interior of the guide body, the poppet being secured to either the piston or sleeve such that relative movement therebetween damps the poppet, thereby minimizing unwanted poppet oscillation and impact loads. The cylinder is vented to reduce the spring rate of the piston-sleeve arrangement to prevent piston bounce under valve opening conditions. The vent also reduces the magnitude of the vacuum drawn by the cylinder which would otherwise hamper valve closing. In the preferred embodiment, the sleeve is contiguously received within the cylinder, the cylinder and sleeve providing extensive bearing sur-faces accommodating motion of the valve element within the check valve to prevent unwanted flutter or other vibration.

Brief Description of the Drawings Fig. 1 is a side elevation in partial cross section of the check valve of the present invention.
Fig. 2 is an end elevation of the valve.
Fig. 3 is an elevation of the opposite end of the check valve.

1 16855~
--4--Best Mode for Carrying Out the Invention Referring to the dra~ings, the check valve of the present invention is sho~m generally at 10 comprising a housing 15 having mounting flanges 20 and 25 at opposite ends thereof for mechanically connecting the valve to a pair of opposed duct ends. The housing also includes at the interior thereof an annular seat 30 which engages poppet or valve element 35 for closing the valve under conditions of reverse flow (flow to the right in Fig. 1).
Disposed within housing 15, and supported on struts 40 is a streamlined, aerodynamic guide body 45 which pxo-vides minimal opposition to forward flow. ~s best seen in Fig. 3, the struts are disposed between the housing and guide body and extend in directions defined by components both radially outwardly from, and tangential to the guide body, such strut orientation allowing thermal and fluid pressure loading to be accommodated by a bending of the struts without overstressing of the attachment points of the struts to the housing ana guide body.
Guide body 45 comprises leading and trailing (with respect to forward flow) faces 50 and 55, respectively, joined at 58 by any suitable means such as welding, brazing or similar bonding or suitable fasteners such as rivets or the like. Leading face 50 is apertured at 60 while trailing face 55 is apertured at 65, the apertures readily accommodating reverse flow through the valve for application of such reverse flow to valve element 35 for the seating thereof. (See phantom lines in Fig. 1.) As shown, apertures 65 are substantially smaller than 30 apertures 60, both apertures 60 and 65 being diposed gen-erally centrally of the leading and trailing faces. While this genera-l relative sizing and spacing of the apertures is suitable for a compressor bleed air check valve for a gas turbine engine, it will be understood that the check valve of the present invention is not so limited, the size and spacing of the apertures being dictated by the type 1168~0 of fluid accommodated by the valve and the o~erating temperatures and pressures of that fluid.
The leading and trailing guide body faces are of a conical or convergent shape and provide mounts for damping cylinder 70 disposed interiorly of the guide body generall~
centrally thereof. The cylinder is provided with a vent 75 at the downs-tream end thereof and accommodates a sleeve 85, generally contiguously to the cylinder interior.
The cylinder and sleeve define a damping means or dashpot f~r minimization of valve element oscillation and impact.
The vent softens or decreases the spring rate o the sleeve-cylinder arrangement to prevent valve element bounce when - the valve is opened. The vent also aids in the draw of fluid into the cylinder under checking conditions, thereby militating against the formation of a vacuum within the cylinder which would interfere with the closing of the valve.
Valve element 35 is of a conical or convergent shape and is fixed to the end of sleeve 85 by any suitable means such as bolt 90 and mating nut 95. ~1here as in the pre-ferred embodiment, the cylinder and sleeve extend substan-tially the entire length of the check valve, it will be appreciated that these two members define extensive bear-ing surfaces to slideably support the valve while minimizing flutter or other unwanted vibration of the valve element.
The outermost portion of valve element 35 seals with the outermost edge of trailing face 55 when the valve is open, and with seat 30 (as shown in phantom lines) when the valve is closed. As best seen in Fig. 1, valve element 35 comprises a concave shell, forward fluid flow through the valve being applied directly to the outer or convex valve element surface thereby opening the valve, position-ing the valve element such that the leading guide body face is received in part interiorly of the valve element.
Reverse (checking) flow is applied through apertures 65 and 60 in the guide body to the inner (concave) face of the valve element for seating against seat 30 thereby closing the valve. As best seen in Fig. 1, trailing guide ~ ~6855~

body face 55 and the valve element 35 being generally con,-cal, define a streamlined center body within the interior of the valve. This center body, and the interior of housing 15 define a passage 100 sf generally uniform cross sectional or flow area from one end thereof to the other.
It will be appreciated that this uniform flow area alony with the streamlined shape of the center body defined by the guide bo~y and valve element result in minimum pressure drop across the check valve of the present invention.
Accordingly, it is noted that the check valve of the present invention is characterized by a minimization of pressure drop across the valve. The reciprocation of the valve element between open and closed conditions is damped by the sleeve-cylinder damping mechanism which, due to its disposition within the interior of the valve provides extensive bearing surfaces for the reciprocation of the poppet. The cylinder vent militates against piston bounce and hindrance of checking due to creation of a vacuum within the cylinder. Being disposed within the guide body, the cylinder and sleeve bearing surfaces are protected from contamination over substantially their entire length.
The apertures provided in the leading and trailing faces of guide body 45 allow rapid checking at low reverse flows.
Additionally, such low reverse flow checking is enhanced by the concave shell construction of the valve element itself, such structure providing effective capture of reverse fluid flow.
While the check valve of the present invention is illustrated without actuators or assists o any kind, the operation of the valve being controlled by the direction of the flow therethrough, it will be appreciated that springs, actuators or other assists may be employed as desired.
Although this invention has been shown and described with respect to detailed embodi~ents thereof, it will be understood by those skilled in the art that various 1 168~S0 changes in form and detail thereof may be made ~7ithout departing from the spirit and scope of the claimed inve~-tion.
.

Claims (12)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follo~1s:
1. A fluid check valve comprising:
a housing, defining an outer portion of a fluid channel;
a seat disposed within said housing;
a valve element positionable within said housing by fluid flow therethrough, said valve element, by applica-tion thereto of reverse fluid flow being held in engage-ment with said seat for closing said check valve and, by application of forward fluid flow thereto, being unseated for opening said check valve and an apertured guide body disposed within said casing and defining, with said valve element under conditions of normal fluid flow, an inner wall of said fluid passage, said apertures accommodating reverse flow therethrough for application of said reverse flow to said valve element for seating said valve element and closing said check valve, said check valve being characterized by:
said guide body being mounted within the interior of said housing by a plurality of spaced struts, each of said struts being disposed between said housing and guide body and extending in directions defined by directional components both radially outward from and tangential to said guide body.
2. A fluid check valve according to claim 1 further characterized by said valve element and guide body defining a streamlined center body having generally conical leading and trailing surface portions.
3. A fluid check valve according to claim 1 further characterized by said fluid channel defined by said housing, said guide body and said valve element being of substantially uniform flow area throughout the length thereof.
4 A fluid check valve according to claim 1 further characterized by:
a sleeve fixed to one of said valve element and guide body and a cylinder receiving said sleeve therewithin, said cylinder being fixed to the other of said valve element and guide body, said sleeve and cylinder providing means for damping oscillations of said valve element.
5. A fluid check valve according to claim 4 further characterized by said cylinder including a vent aperture therein for relief of fluid pressure within said cylinder to prevent valve element bounce as said sleeve moves toward said vent aperture and to enhance the intake of fluid to said cylinder as said sleeve moves away from said vent aperture.
6. A fluid check valve according to claim 4 further characterized by said sleeve being contiguous to the interior of said cylinder, said cylinder and sleeve defining bearing surfaces on which said valve element is supported for movement relative to said seat.
7. A fluid check valve comprising:
a housing, defining an outer portion of a fluid channel;
a seat disposed within said housing, a valve element positionable within said housing by fluid flow therethrough, said valve element, by appli-cation thereto of reverse fluid flow being held in engagement with said seat for closing said check valve and, by application of forward fluid flow thereto, being unseated for opening said check valve and an apertured guide body including leading and trail-ing apertured, streamlined faces and disposed within said casing and defining, with said valve element under con-ditions of normal fluid flow, an inner wall of said fluid passage, said apertures accommodating reverse flow therethrough for application of said reverse flow to said valve element for seating said valve element and closing said check valve, said check valve being characterized by said valve element comprising a concave shell, forward fluid flow through said valve impinging on an exterior face of said valve element unseating said valve element such that said leading guide body face is received at least in part interiorly of said valve element.
8. A fluid check valve according to claim 7 further characterized by said valve element and guide body defining a streamlined center body having generally conical leading and trailing surface portions.
9. A fluid check valve according to claim 7 further characterized by said fluid channel defined by said housing, said guide body and said valve element being of substantially uniform flow area throughout the length thereof.
10. A fluid check valve according to claim 7 and further characterized by:
a sleeve fixed to one of said valve element and guide body and a cylinder receiving said sleeve therewithin, said cylinder being fixed to the other of said valve element and guide body, said sleeve and cylinder providing means for damp-ing oscillations of said valve element.
11. A fluid check valve according to claim 10 further characterized by said cylinder including a vent aperture therein for relief of fluid pressure within said cylinder to prevent valve element bounce as said sleeve moves toward said vent aperture and to enhance the intake of fluid to said cylinder as said sleeve moves away from said vent aperture,
12. A fluid check valve according to claim 10 further characterized by said sleeve being contiguous to the interior of said cylinder, said cylinder and sleeve defining bearing surfaces on which said valve element is supported for movement relative to said seat.
CA000383089A 1980-09-25 1981-08-03 Check valve Expired CA1168550A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US19103780A true 1980-09-25 1980-09-25
US191,037 1980-09-25

Publications (1)

Publication Number Publication Date
CA1168550A true CA1168550A (en) 1984-06-05

Family

ID=22703866

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000383089A Expired CA1168550A (en) 1980-09-25 1981-08-03 Check valve

Country Status (7)

Country Link
JP (1) JPH0147675B2 (en)
CA (1) CA1168550A (en)
DE (1) DE3137871C2 (en)
FR (1) FR2490771B1 (en)
GB (1) GB2085125B (en)
IL (1) IL63797A (en)
IT (1) IT1138611B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4373544A (en) * 1980-09-25 1983-02-15 United Technologies Corporation Check valve
IT1157513B (en) * 1982-02-17 1987-02-18 Bonomi Ilario & C Enol Gas Non-return valve with spring-loaded shutter perfected
DE3404769A1 (en) * 1984-02-10 1985-08-14 Porsche Ag Valve for installation in a manifold of a fluid conduit of an internal combustion engine
GB2319586A (en) * 1996-11-20 1998-05-27 Draftex Ind Ltd One-way valve

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE503543C (en) * 1928-01-27 1930-07-24 E H Hugo Junkers Dr Ing Selbsttaetiges through valve
US2870779A (en) * 1955-12-09 1959-01-27 Cook Electric Co Automatic check valve
US3160112A (en) * 1958-07-31 1964-12-08 Westinghouse Electric Corp Check valve and application thereof
DE1193750B (en) * 1961-01-20 1965-05-26 Licentia Gmbh -Return valve, in particular for solid foreign body containing gases
US3134394A (en) * 1962-05-29 1964-05-26 Ohta Tsunetaro Check valves
US3194255A (en) * 1962-07-09 1965-07-13 Westinghouse Electric Corp Check valve
DE1806748B2 (en) * 1968-11-02 1975-11-13 Alfred Teves Gmbh, 6000 Frankfurt
US3621874A (en) * 1970-08-17 1971-11-23 Atomic Energy Commission Lift-type check valve
JPS4857730U (en) * 1971-10-30 1973-07-23
DE2428519A1 (en) * 1974-06-12 1976-01-02 Mokveld Mach Bv Check valve
JPS5218229A (en) * 1975-08-04 1977-02-10 Ebara Mfg Check valve
DE2821255C2 (en) * 1978-05-16 1987-04-30 Mokveld Valves B.V., Gouda, Nl

Also Published As

Publication number Publication date
GB2085125A (en) 1982-04-21
FR2490771A1 (en) 1982-03-26
DE3137871A1 (en) 1982-05-06
DE3137871C2 (en) 1990-06-13
FR2490771B1 (en) 1986-02-21
IT8124125D0 (en) 1981-09-24
IT1138611B (en) 1986-09-17
CA1168550A1 (en)
JPH0147675B2 (en) 1989-10-16
JPS5783764A (en) 1982-05-25
IL63797D0 (en) 1981-12-31
GB2085125B (en) 1983-12-21
IL63797A (en) 1984-12-31

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