AU2018202607A1 - Check valve improvements - Google Patents
Check valve improvements Download PDFInfo
- Publication number
- AU2018202607A1 AU2018202607A1 AU2018202607A AU2018202607A AU2018202607A1 AU 2018202607 A1 AU2018202607 A1 AU 2018202607A1 AU 2018202607 A AU2018202607 A AU 2018202607A AU 2018202607 A AU2018202607 A AU 2018202607A AU 2018202607 A1 AU2018202607 A1 AU 2018202607A1
- Authority
- AU
- Australia
- Prior art keywords
- valve
- fluid
- valve body
- check valve
- recess
- 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.)
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Abstract
The present disclosure relates to a check valve for a hydraulic cylinder performing a safety critical 5 function, such as a hoist check valve. In one aspect, there is provided a check valve assembly comprising a valve body, a valve member, and an actuator for the valve member. In one aspect, the valve body comprises a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for a valve member, and at least one recess in the valve body which locally widens the passageway, and wherein in use, the or each recess extends at least part way around the valve 0 member. o61 R TUR o pTP RETUR rll112 Figure 1
Description
TECHNICAL FIELD [0002] The present disclosure relates to a check valve for a hydraulic cylinder performing a safety critical function. The invention is described in relation to a tipping truck or trailer, but it is not so limited in application, with potential applications including all of those in which a hydraulic cylinder is used to lift a load and maintain it in an elevated position.
BACKGROUND [0003] A hoist check valve functions to lock a hydraulic cylinder (the hoist) in position, and keep the hoist in this position even if a pressure loss event occurs. This function is safety critical in machinery such as tipping trucks and trailers, which comprise a bed which is tilted by the hoist cylinder, as the hoist check valve prevents uncommanded drop of a raised (tilted) bed.
[0004] During raising and lowering operations, the truck/trailer must remain stationary, but operators wish to reduce this idle time as far as possible.
[0005] ft is against this background and the problems and difficulties associated therewith that the present invention has been developed.
[0006] Certain objects and advantages of the present invention will become apparent from the following description, taken in connection with the accompanying drawings, wherein, by way of illustration and example, an embodiment of the present invention is disclosed.
SUMMARY [0007] According to a first aspect, there is provided a check valve assembly comprising a valve body, a valve member, and an actuator for the valve member, wherein the valve body comprises a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for the valve member so that the valve member may open and close the fluid passageway, and at least one
2018202607 13 Apr 2018 recess in the valve body which extends at least part way around the valve member so as to locally widen the passageway.
[0008] According to a further aspect, there is provided a valve body for a check valve assembly, the valve body comprising a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for a valve member, and at least one recess in the valve body which locally widens the passageway, and wherein in use, the or each recess extends at least part way around the valve member.
[0009] In one form, the valve body comprises a single recess.
[0010] In one form, the recess extends completely around the valve member.
[0011] In one form, in an alternative, the valve body comprises a plurality of recesses, which collectively extend around the valve member to a substantive extent.
[0012] In one form, the valve body and the passageway each comprise a circular cross-sectional shape, and the recess comprises an annulus which encircles the valve member.
[0013] In one form, the second fluid port adjoins the recess in the valve body.
[0014] In one form, the first fluid port adjoins the valve seat for the valve member.
[0015] In one form, the recess adjoins the valve seat.
[0016] In one form, an enlarged, elongated aperture is provided between the recess and the second fluid port.
[0017] In one form, the valve member comprises a cylindrical body.
[0018] In one form, the valve member comprises a piston.
[0019] In one form, the valve member comprises a cartridge valve.
[0020] In one form, the actuator is pneumatic. In an alternative, the actuator is one of hydraulic, electric or mechanical.
[0021] In one form, the valve body further comprises a mount for the cartridge valve.
2018202607 13 Apr 2018 [0022] In one form, the mount comprises a port for receiving a portion of the cartridge valve.
[0023] In one form, the first and second fluid ports are not inline.
[0024] In one form, the first and second fluid ports extend substantially normal to each other.
[0025] In one form, the valve body comprises a block shape.
[0026] In one form, the check valve assembly further comprises a pressure relief valve which is received in a relief valve port which extends from a chamfer provided at a comer of the block shaped valve body.
[0027] In one form, the valve body is machined.
[0028] In one form, in an alternative, the valve body may be any one of cast, moulded or 3D printed.
[0029] In one form, the valve body is steel.
[0030] In one form, in an alternative the valve body is plastic, ceramic or a composite material.
[0031] According to a further aspect, there is provided an hydraulic hoist check valve assembly comprising a valve body, a cartridge valve comprising a cylindrical valve member, wherein the valve body comprises a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for the valve member so that the valve member may open and close the fluid passageway, and an annular recess in the valve body which extends at least part way around the valve member so as to locally widen the passageway.
[0032] According to a further aspect, there is provided a valve body for a hydraulic hoist check valve assembly, the valve body comprising a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for a cartridge valve comprising a cylindrical valve member, and an annular recess which locally widens the passageway, and wherein in use, the recess extends at least part way around the valve member.
[0033] For ease of description, a tipping truck or trailer employing the present invention is referenced in its usual assembled, operating position, and terms such as front, rear, upper, lower, horizontal, longitudinal etc., may be used with reference to this usual position. However, the invention may be manufactured, transported, sold, or used in orientations other than that described and shown here.
2018202607 13 Apr 2018
BRIEF DESCRIPTION OF DRAWINGS [0034] Embodiments of the present invention will be discussed with reference to the accompanying drawings wherein:
[0035] Figure 1 is a schematic view of a control arrangement for a hoist cylinder of a tipping truck or trailer;
[0036] Figures 2 and 3 are isometric views of a check valve assembly from the control arrangement of Figure 1;
[0037] Figure 4 is a front view of the check valve assembly of Figure 2;
[0038] Figure 5 is a top end view of the check valve assembly;
[0039] Figure 6 is a cross-sectional view taken through the check valve assembly along line A-A;
[0040] Figures 7 and 8 are isometric views of a valve body from the check valve assembly of Figure 2;
[0041] Figure 9 is a front view of the valve body of Figure 7;
[0042] Figure 10 is a side edge view of the valve body;
[0043] Figure 11 is a top end view of the valve body;
[0044] Figure 12 is a bottom end view of the valve body;
[0045] Figure 13 is a cross-sectional view taken through the valve body along line A-A;
[0046] Figure 14 is a cross-sectional view taken through the valve body along line B-B; and [0047] Figure 15 is a cross-sectional view taken through the valve body along line C-C.
[0048] In the following description, like reference characters designate like or corresponding parts throughout the figures.
DESCRIPTION OF EMBODIMENTS [0049] Referring now to Figure 1, where there is illustrated a control arrangement for a hydraulic hoist cylinder 100 for tipping (hoisting) a bed (not illustrated) of a tipping truck or trailer.
2018202607 13 Apr 2018 [0050] Operation of the hoist cylinder 100 is controlled by a directional control valve (DCV) 110. An input line 112 extends to the DCV 110 from a hydraulic pump (not illustrated), and a return line 114 extends from the DCV 110 to a reservoir (or tank - not illustrated) for the hydraulic fluid.
[0051] A check valve assembly 1 is installed in a fluid line 116 extending between the hoist cylinder 100 and the DCV 110. In this case, a fitting 120 connects the check valve assembly 100 to a barrel 102 of the hoist cylinder 100.
[0052] Referring now to Figures 2 through 6, it can be seen that the check valve assembly 1 comprises a valve body 10 and a pneumatically actuated cartridge valve 50 (although other valve types could be employed). The cartridge valve 50 comprises a valve member 52, an actuator 54 for the valve member 52, and a housing 56.
[0053] Referring now to Figures 7 through 15, it can be seen that the valve body 10 comprises a block of machined steel in this case, although it could take other forms, be manufactured by other suitable means, and/or employ other suitable materials. This valve body 10 comprises a first fluid port 12, a second fluid port 14, and a fluid passageway 16 extending between the first and second fluid ports 12 and 14. In this case, the ports 12 and 14 are threaded to receive connector fittings.
[0054] Being a block, the valve body 10 comprises a pair of major side faces 20 and 21, a pair of side edge faces 22 and 23, and a pair of end faces 24 and 25.
[0055] The first fluid port 12 is located in a first of the end faces 24 of the valve body 10, and the second fluid port 14 is located in a first of the side edge faces 22 of the valve body 10. That is to say, the first fluid port 12 and the second fluid port 14 extend normal to each other, so that the fluid passageway 16 comprises two portions 16a and 16b extending normal to each other, and which intersect at a comer.
[0056] The valve body 10 further comprises a mount 18 for the cartridge valve. This mount 18 comprises a threaded port for receiving a threaded portion of the housing 56 of the cartridge valve 50 therein. This mount port 18 is located in a second of the end faces 25 of the valve body 10, and it is aligned with the first fluid port 12.
[0057] The first fluid port 12 adjoins a valve seat 30 for the valve member 52. The valve member comprises a cylindrical sleeve 58 which seals against the cooperatively shaped (i.e. circular) valve seat 30. The sleeve 58 comprises a side wall 60, an end wall 62, a plurality of fluid ports 64 through the side wall 60, and an aperture 66 through the end wall 62.
2018202607 13 Apr 2018 [0058] The valve member 52 further comprises a piston 68 which depends from the actuator, and which slides within the sleeve 58 to open and close the fluid passageway 16 by opening and closing both the ports 64 and the aperture 66.
[0059] The second fluid port 14 adjoins a recess 40 in the valve body 10, which extends around the valve member 52 so as to locally enlarge (by widening) the passageway 16. In this case, the recess 40 comprises an annulus which surrounds (encircles) the sleeve of the valve member 52. It should be understood that the shape of the recess is not limited to an annulus, so long as it can receive fluid, and preferably distribute this fluid around the valve member 52.
[0060] Because the recess 40 locally widens the passageway 16, an enlarged, elongated aperture 68 can be provided between the recess 40 and the second fluid port 14, so as to maximise fluid flow therebetween in use. In this case, the elongated aperture 68 comprises a widthwise (relative to the widening of the passageway provided by the recess 40) extending slot 42, but may take the form of any one of an ellipse, oval or a rectangle.
[0061 ] In use, to extend the hoist cylinder and raise (tilt) the bed, the piston is set to its open position responsive to a pneumatic (in this case) signal from the DCV, and hydraulic fluid flow is directed (by the DCV) to the first fluid port 12, through aperture 66 and ports 44, into the recess 40, through elongated aperture 68, the second fluid port 14 and into the hoist cylinder 100.
[0062] When the hoist cylinder 100 is extended, the piston 68 is set to its closed position to prevent uncommanded retraction of the hoist cylinder 100.
[0063] To retract the hoist cylinder 100 and lower the bed, the piston 68 is set to its open position, and hydraulic flow is directed (by the DCV) from the hoist cylinder 100 to the second fluid port 14, through elongated aperture 68, into the recess 40, through ports 44 and aperture 66, and out of the first fluid port 12.
[0064] By virtue of the design of check valve assembly 1, and in particular by way of it comprising the elongated aperture 68 and recess 40, increased flows and significant pressure drops have been achieved when compared with a presently employed check valve, which lacked these features.
[0065] In terms of a hoist cylinder 100 retraction on a tipping truck or trailer, this pressure drop manifests itself as a significant reduction in the time taken to lower the bed, which in turn reduces truck idle time, resulting in improved efficiencies for operators operating in an increasingly competitive market.
2018202607 13 Apr 2018 [0066] The check valve assembly 1 further comprises a pressure relief valve 70, which is screwed into a relief valve port 72. This relief valve port 72 is positioned between the first and second fluid ports 12 and 14, and subtends an acute angle with respect to each of these. Moreover, the relief valve port 72 extends from a chamfer 74 provided at the comer of end face 24 and side edge face 22. Directing the relief valve port 72 at this angle, and providing chamfer 74, both have the advantageous effect of reducing the size of the valve body 10, when compared with a presently employed check valve, which possesses neither of these features. As a result, valve body 10 requires less steel (thereby reducing cost), and it is physically smaller, so that it does not protrude to the same extent as the presently employed check valve, and so it is less susceptible to damage when in use.
[0067] A further advantage of inclining the relief valve port 72 in this way, is that relief passage 76 can be drilled via the first fluid port 12, eliminating any need for an extra access hole to be drilled in order to drill relief passage 76, which (i.e the extra access hole) then must be plugged at extra expense.
[0068] Throughout the specification and the claims that follow, unless the context requires otherwise, the words “comprise” and “include” and variations such as “comprising” and “including” will be understood to imply the inclusion of a stated integer or group of integers, but not the exclusion of any other integer or group of integers.
[0069] The reference to any prior art in this specification is not, and should not be taken as, an acknowledgement of any form of suggestion that such prior art forms part of the common general knowledge.
[0070] It will be appreciated by those skilled in the art that the invention is not restricted in its use to the particular application described. Neither is the present invention restricted in its preferred embodiment with regard to the particular elements and/or features described or depicted herein. It will be appreciated that the invention is not limited to the embodiment or embodiments disclosed, but is capable of numerous rearrangements, modifications and substitutions without departing from the scope of the invention as set forth and defined by the following claims.
2018202607 13 Apr 2018
Claims (22)
1. A check valve assembly comprising a valve body, a valve member, and an actuator for the valve member, wherein the valve body comprises a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for the valve member so that the valve member may open and close the fluid passageway, and at least one recess in the valve body which extends at least part way around the valve member so as to locally widen the passageway.
2. The check valve assembly of claim 1, wherein the valve body comprises a single recess.
3. The check valve assembly of claim 2, wherein the recess extends completely around the valve member.
4. The check valve as in any one of the preceding claims, wherein the valve body and the passageway each comprise a circular cross-sectional shape, and the recess comprises an annulus which encircles the valve member.
5. The check valve as in any one of the preceding claims, wherein the second fluid port adjoins the recess in the valve body.
6. The check valve as in any one of the preceding claims, wherein the first fluid port adjoins the valve seat for the valve member.
7. The check valve as in any one of the preceding claims, wherein the recess adjoins the valve seat.
8. The check valve as in any one of the preceding claims, wherein an enlarged, elongated aperture is provided between the recess and the second fluid port.
9. The check valve as in any one of the preceding claims, wherein the valve member comprises a cylindrical body.
10. The check valve as in any one of the preceding claims, wherein the valve member comprises a piston.
11. The check valve as in any one of the preceding claims, wherein the valve member comprises a cartridge valve.
2018202607 13 Apr 2018
12. The check valve of claim 11, wherein the valve body further comprises a mount for the cartridge valve.
13. The check valve of claim 12, wherein the mount comprises a port for receiving a portion of the cartridge valve.
14. The check valve as in any one of the preceding claims, wherein the first and second fluid ports are not inline.
15. The check valve as in any one of the preceding claims, wherein the first and second fluid ports extend substantially normal to each other.
16. The check valve assembly of claim 1, wherein the valve body comprises a plurality of recesses, which collectively extend around the valve member to a substantive extent.
17. The check valve as in any one of the preceding claims, wherein the valve body comprises a block shape.
18. The check valve assembly of claim 17, further comprising a pressure relief valve which is received in a relief valve port which extends from a chamfer provided at a comer of the block shaped valve body.
19. A valve body for a check valve assembly, the valve body comprising a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for a valve member, and at least one recess in the valve body which locally widens the passageway, and wherein in use, the or each recess extends at least part way around the valve member.
20. The valve body of claim 18, wherein a valve body and the passageway each comprise a circular cross-sectional shape, and the recess comprises an annulus which encircles the valve member.
21. A check valve assembly comprising a valve body, a cartridge valve comprising a cylindrical valve member, wherein the valve body comprises a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for the valve member so that the valve member may open and close the fluid passageway, and an annular recess in the valve body which extends at least part way around the valve member so as to locally widen the passageway.
22. A valve body for a hoist check valve assembly, the valve body comprising a first fluid port, a second fluid port, a fluid passageway extending between the first and second fluid ports, a valve seat for a cartridge valve comprising a cylindrical valve member, and an annular recess which locally widens the passageway, and wherein in use, the recess extends at least part way around the valve member.
2018202607 13 Apr 2018
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2018202607 13 Apr 2018
110
AIR
PILOT
116 ΊΞΓ 120
TANK
RETURN
PTO
PUMP
I I
Figure 1
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Figure 2
Figure 3
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Figure 4
SEC ΊΪΟ N a-a
Figure 6
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B
Figure 9
Figure 10
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Figure 11
Figure 12
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Figure 13
Figure 14
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2018100576A AU2018100576A4 (en) | 2017-04-13 | 2018-05-03 | Check valve improvements |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2017901373 | 2017-04-13 | ||
| AU2017901373A AU2017901373A0 (en) | 2017-04-13 | Check valve improvements |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018100576A Division AU2018100576A4 (en) | 2017-04-13 | 2018-05-03 | Check valve improvements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2018202607A1 true AU2018202607A1 (en) | 2018-06-14 |
Family
ID=62527800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018202607A Abandoned AU2018202607A1 (en) | 2017-04-13 | 2018-04-13 | Check valve improvements |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2018202607A1 (en) |
-
2018
- 2018-04-13 AU AU2018202607A patent/AU2018202607A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK5 | Application lapsed section 142(2)(e) - patent request and compl. specification not accepted |