CA1148059A - Close-off valve for suction pipes in hydraulic pumps - Google Patents
Close-off valve for suction pipes in hydraulic pumpsInfo
- Publication number
- CA1148059A CA1148059A CA000348916A CA348916A CA1148059A CA 1148059 A CA1148059 A CA 1148059A CA 000348916 A CA000348916 A CA 000348916A CA 348916 A CA348916 A CA 348916A CA 1148059 A CA1148059 A CA 1148059A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- disc
- pump
- reservoir
- piston
- 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
Links
Landscapes
- Details Of Reciprocating Pumps (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A close-off valve for suction pipes to establish communication between a source of pressure and a consumer of pressure, such as a hydraulic pump.
The valve makes it possible to disconnect the consumer in a simple and reliable manner, that is without leakage of the pressure, in addition to which it allows a liquid, such as oil, in certain quantities to flow through the valve above the valve disc, when the latter assumes the position in which it closes the outlet of the valve. For this purpose the valve comprises a solenoid valve which controls a flow of pressurized air to the valve housing in order to actuate the valve disc closing off said communication. In addition, the valve is arranged with through-passage means above said disc in order to allow passage-through of a certain amount of liquid, when the valve disc is in its closing position.
A close-off valve for suction pipes to establish communication between a source of pressure and a consumer of pressure, such as a hydraulic pump.
The valve makes it possible to disconnect the consumer in a simple and reliable manner, that is without leakage of the pressure, in addition to which it allows a liquid, such as oil, in certain quantities to flow through the valve above the valve disc, when the latter assumes the position in which it closes the outlet of the valve. For this purpose the valve comprises a solenoid valve which controls a flow of pressurized air to the valve housing in order to actuate the valve disc closing off said communication. In addition, the valve is arranged with through-passage means above said disc in order to allow passage-through of a certain amount of liquid, when the valve disc is in its closing position.
Description
The invention generally relates to an improvement in close-off valves in suction lines of the kind comprising a valve housing in which a spring-loaded piston is movably mounted. The rod of the piston supports a valve disc which is arranged to move into a position in engagement with a valve seat for the purpose of shutting-off a suction line.
The purpose of the invention is to provide a close-off valve, which is arranged, while shutting-off a flow of a medium, such as a hydraulic fluid from the source to the consumer, e.g. a hydraulic pump, to allow a small flow of the hydraulic fluid, thus effecting lubrication and to some extent cooiing of the hydraulic pump when the latter is running idle, that is when the valve disc is in its position abutting against its valve seat to close-off the main passageway through the valve.
More precisely, the invention is an improved close-off valve for suction pipes between a reservoir and a hydraulic pump, said pump comprising a hydraulic piston system, a main passageway adapted to selectively connect with said reservoir, a tilting disc for operating said hydrauiic piston system for generating a flow of a hydraulic fluid from the reservoir through the said main passageway to said pump, a thrust bearing supporting said tilting disc, and a bypass passageway provided in the pump housing and passing across said tilting disc and said thrust bearing to allow passage through of a small amount ' 11~805~
of oil, said small amount of oil being sufficient to lub-ricate and cool the pump, said close-off valve comprising a valve housing, a spring-loaded piston movably mounted in said valve housing and operatively connected to a rod, a valve disc supported by said rod, a solenoid valve control-ling the movement of said valve disc, said valve disc arranged to be moved into abutment against a valve seat for the purpose of shutting off the connection of said reservoir to said main passageway of the pump, the improvement compr-ising a cavity in said valve housing between said reservoirand said valve seat, said cavity being in continuous communication with the reservoir and with said bypass passageway regardless of the position of said valve disc for allowing oil to flow from the reservoir around said thrust bearing and said tilting disc and further through said bypass passageway to lubricate said thrust bearing of the pump and said tilting disc to cool the pump even when said valve disc is in the closed position.
~L ~
~8~)59 The invention will be described in closer detail in the following with reference to the accompanying drawings, wherein Fig. 1 illustrates a first embodiment of the valve in accordance with the invention, when connected to a hydraulic pump, ~ig. 2 illustrateæ a modified embodiment of the valve of the invention, and Fig. 3 illustrates the valve in accordance with the invention arranged in a hydraulic pump and connected in a hydraulic circuit.
Fig. 1 illustrates in a cross-sectional view a valve 1 in accordance wlth the invention when connected 'o a hydraulic pump 2. The supply of hydraulic fluid to the pump 2 is controlled by the valve 1. ~he valve 1 comprises two parts 3 and 4 forming a housing in which a plston 5 i8 movably mounted. The piston 5 has an extension 6 which supports a vaive disc 7. ~he piæton 5 iæ movable in a chamber 8 and this movement of the piston 5 causes displacement of the valve disc 7 in a cavity 9.
On the inner face of the housing 3, 4 is arranged a shoulder 10, whereby a cavity 11 is formed between ,-' .: .
' . . ~ , .
- ~ .
li~8059 the ~iston 5 and the shoulder 10, into which cavity, e.g. compressed air may be supplied from a line 12 while being controlled by a solenoid valve 13. ~he solenoid valve 13 is of a well known type and therefore need not be described in closer detail here.
The piston 5 is actuated by a spring 14 which tends to urge the piston 5 to a position wherein the valve disc 7 abuts against its seat and in which the inlet (the pipe socket 15) is closed.
Consequently, hydraulic fluid is prevented from flowing through the outlet 16. Pressurized air may be fed through the line 12 into the cavity 11, resulting in displacement of the valve disc 7 to the position indicated in dash-and-dot lines, whereby the main passageway through the valve 1 is opened.
In the embodiment illustrated, the valve 1 is connected to a hydraulic pump 2, which in the manner indicated is provided with a pipe 17 to connect it to a reservoir container (reference numeral 27 in Fig. 3) holding a hydraulic fluid. The hydraullc pump lncludes a thrust bearing 18 and a tilting disc 19 and when said bear~ng and said disc are made to rotate, as they are when the hydraulic pump is in operation, a partial vacuum is generated forcing hydraulic fluid to flow from the line 17 through a channel 31 to the cavity 20 :~ 7 ':
;
. .
11481;~59 occupied by details 18, 19, and further through a line 21 in the pump unit 22 to the outlet line 23 to be supplied to the valve 1. In the open position of the valve 1, hydraulic fluid i9 sucked down into the outlet 16, whereas when the valve i~ closed, the flow of fluid from the line 23 will be through the pipe socket 15. This means that lubrication of the hydraulic motor is provided not only during the pump operation but also while it is running idle. In ~0 addition, thls continual flow of lubricating medium i8 sufficient to lower the temperature of the pump to some extent in addition to which the lubrication has the positive effects of not only preventing overheating of the pump but al~o of giving noiseless operation thereof.
Fig. 2 shows a modified embodiment according to which a spring 24 tends to move the piston 5 to the open position shown by the position of the valve disc 7, indicated in dash-and-dot lines. In this ca3e shutting of the valve 1 thus i9 effected with the aid of pressurized air which is forced from the line 12 into an upper ca~ity 25 formed in.the valve housing 26, Also in this case oil or some other hydraulic fluid is allowed to flow through the line 23 both when the valve 1 i9 in its open and in its closed positions in the manner explained above.
~148C~59 Fig. 3 sho~ the valve 1 and the pump 2 when inserted in a hydraulic pipe system including a reservoir container 27 and communicating lines 17, 23 between the pump and the container 27 as well as between the pump 2 and the valve 1. In addition, this drawing figure indicates the provision of a line 28 from the valve 1 to the container 27 and a line 29 from the pump to the consumer of the hydraulic fluid under pressure a~ well as the provision of a return pipe 30 from this consumer.
In addition, the drawing flgure 6uggests a system designed to feed compressed air with the aid of the solenoid valve.
The invention is not limited to the embodi-ments shown and described in the aforegoing but modifications are possible within the scope of the appended claims. It goes without sayine that the valve could be used in other positions and appli-cations than those suggested herein, partioularly when it is desired to be able to close off a flow of liquid from a pump or similar means to remove the pump for repair,s~vice or exchange.
-`' ~ ` '~
~ -'
The purpose of the invention is to provide a close-off valve, which is arranged, while shutting-off a flow of a medium, such as a hydraulic fluid from the source to the consumer, e.g. a hydraulic pump, to allow a small flow of the hydraulic fluid, thus effecting lubrication and to some extent cooiing of the hydraulic pump when the latter is running idle, that is when the valve disc is in its position abutting against its valve seat to close-off the main passageway through the valve.
More precisely, the invention is an improved close-off valve for suction pipes between a reservoir and a hydraulic pump, said pump comprising a hydraulic piston system, a main passageway adapted to selectively connect with said reservoir, a tilting disc for operating said hydrauiic piston system for generating a flow of a hydraulic fluid from the reservoir through the said main passageway to said pump, a thrust bearing supporting said tilting disc, and a bypass passageway provided in the pump housing and passing across said tilting disc and said thrust bearing to allow passage through of a small amount ' 11~805~
of oil, said small amount of oil being sufficient to lub-ricate and cool the pump, said close-off valve comprising a valve housing, a spring-loaded piston movably mounted in said valve housing and operatively connected to a rod, a valve disc supported by said rod, a solenoid valve control-ling the movement of said valve disc, said valve disc arranged to be moved into abutment against a valve seat for the purpose of shutting off the connection of said reservoir to said main passageway of the pump, the improvement compr-ising a cavity in said valve housing between said reservoirand said valve seat, said cavity being in continuous communication with the reservoir and with said bypass passageway regardless of the position of said valve disc for allowing oil to flow from the reservoir around said thrust bearing and said tilting disc and further through said bypass passageway to lubricate said thrust bearing of the pump and said tilting disc to cool the pump even when said valve disc is in the closed position.
~L ~
~8~)59 The invention will be described in closer detail in the following with reference to the accompanying drawings, wherein Fig. 1 illustrates a first embodiment of the valve in accordance with the invention, when connected to a hydraulic pump, ~ig. 2 illustrateæ a modified embodiment of the valve of the invention, and Fig. 3 illustrates the valve in accordance with the invention arranged in a hydraulic pump and connected in a hydraulic circuit.
Fig. 1 illustrates in a cross-sectional view a valve 1 in accordance wlth the invention when connected 'o a hydraulic pump 2. The supply of hydraulic fluid to the pump 2 is controlled by the valve 1. ~he valve 1 comprises two parts 3 and 4 forming a housing in which a plston 5 i8 movably mounted. The piston 5 has an extension 6 which supports a vaive disc 7. ~he piæton 5 iæ movable in a chamber 8 and this movement of the piston 5 causes displacement of the valve disc 7 in a cavity 9.
On the inner face of the housing 3, 4 is arranged a shoulder 10, whereby a cavity 11 is formed between ,-' .: .
' . . ~ , .
- ~ .
li~8059 the ~iston 5 and the shoulder 10, into which cavity, e.g. compressed air may be supplied from a line 12 while being controlled by a solenoid valve 13. ~he solenoid valve 13 is of a well known type and therefore need not be described in closer detail here.
The piston 5 is actuated by a spring 14 which tends to urge the piston 5 to a position wherein the valve disc 7 abuts against its seat and in which the inlet (the pipe socket 15) is closed.
Consequently, hydraulic fluid is prevented from flowing through the outlet 16. Pressurized air may be fed through the line 12 into the cavity 11, resulting in displacement of the valve disc 7 to the position indicated in dash-and-dot lines, whereby the main passageway through the valve 1 is opened.
In the embodiment illustrated, the valve 1 is connected to a hydraulic pump 2, which in the manner indicated is provided with a pipe 17 to connect it to a reservoir container (reference numeral 27 in Fig. 3) holding a hydraulic fluid. The hydraullc pump lncludes a thrust bearing 18 and a tilting disc 19 and when said bear~ng and said disc are made to rotate, as they are when the hydraulic pump is in operation, a partial vacuum is generated forcing hydraulic fluid to flow from the line 17 through a channel 31 to the cavity 20 :~ 7 ':
;
. .
11481;~59 occupied by details 18, 19, and further through a line 21 in the pump unit 22 to the outlet line 23 to be supplied to the valve 1. In the open position of the valve 1, hydraulic fluid i9 sucked down into the outlet 16, whereas when the valve i~ closed, the flow of fluid from the line 23 will be through the pipe socket 15. This means that lubrication of the hydraulic motor is provided not only during the pump operation but also while it is running idle. In ~0 addition, thls continual flow of lubricating medium i8 sufficient to lower the temperature of the pump to some extent in addition to which the lubrication has the positive effects of not only preventing overheating of the pump but al~o of giving noiseless operation thereof.
Fig. 2 shows a modified embodiment according to which a spring 24 tends to move the piston 5 to the open position shown by the position of the valve disc 7, indicated in dash-and-dot lines. In this ca3e shutting of the valve 1 thus i9 effected with the aid of pressurized air which is forced from the line 12 into an upper ca~ity 25 formed in.the valve housing 26, Also in this case oil or some other hydraulic fluid is allowed to flow through the line 23 both when the valve 1 i9 in its open and in its closed positions in the manner explained above.
~148C~59 Fig. 3 sho~ the valve 1 and the pump 2 when inserted in a hydraulic pipe system including a reservoir container 27 and communicating lines 17, 23 between the pump and the container 27 as well as between the pump 2 and the valve 1. In addition, this drawing figure indicates the provision of a line 28 from the valve 1 to the container 27 and a line 29 from the pump to the consumer of the hydraulic fluid under pressure a~ well as the provision of a return pipe 30 from this consumer.
In addition, the drawing flgure 6uggests a system designed to feed compressed air with the aid of the solenoid valve.
The invention is not limited to the embodi-ments shown and described in the aforegoing but modifications are possible within the scope of the appended claims. It goes without sayine that the valve could be used in other positions and appli-cations than those suggested herein, partioularly when it is desired to be able to close off a flow of liquid from a pump or similar means to remove the pump for repair,s~vice or exchange.
-`' ~ ` '~
~ -'
Claims (3)
1. An improved close-off valve for suction pipes between a reservoir and a hydraulic pump, said pump compri-sing a hydraulic piston system, a main passageway adapted to selectively connect with said reservoir, a tilting disc for operating said hydraulic piston system for generating a flow of a hydraulic fluid from the reservoir through the said main passageway to said pump, a thrust bearing support-ing said tilting disc, and a bypass passageway provided in the pump housing and passing across said tilting disc and said thrust bearing to allow passage through of a small amount of oil, said small amount of oil being sufficient to lubricate and cool the pump, said close-off valve comprising a valve housing, a spring-loaded piston movably mounted in said valve housing and operatively connected to a rod, a valve disc supported by said rod, a solenoid valve control-ling the movement of said valve disc, said valve disc arranged to be moved into abutment against a valve seat for the purpose of shutting off the connection of said reservoir to said main passageway of the pump, the improvement com-prising a cavity in said valve housing between said reser-voir and said valve seat, said cavity being in continuous communication with the reservoir and with said bypass passageway regardless of the position of said valve disc for allowing oil to flow from the reservoir around said thrust bearing and said tilting disc and further through said bypass passageway to lubricate said thrust bearing of the pump and said tilting disc to cool the pump even when said valve disc is in the closed position.
2. An improved valve as claimed in claim 1, comprising a valve operating cavity between said piston and a shoulder formed in the interior of said valve housing, said solenoid valve controlling the air flow to said valve operating cavity in order to displace said piston against the action of said spring in order to lift said valve disc for the purpose of opening said communication.
3. An improved valve as claimed in claim 1, comprising a valve operating cavity formed between one end wall of said valve housing and said piston, said solenoid valve arranged to control an air flow to said valve opera-ting cavity for the purpose of forcing said piston against the action of said spring to a position, wherein said valve disc abuts against said valve seat, thus interrupting communication through said close-off valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000348916A CA1148059A (en) | 1980-04-01 | 1980-04-01 | Close-off valve for suction pipes in hydraulic pumps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000348916A CA1148059A (en) | 1980-04-01 | 1980-04-01 | Close-off valve for suction pipes in hydraulic pumps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1148059A true CA1148059A (en) | 1983-06-14 |
Family
ID=4116610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000348916A Expired CA1148059A (en) | 1980-04-01 | 1980-04-01 | Close-off valve for suction pipes in hydraulic pumps |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1148059A (en) |
-
1980
- 1980-04-01 CA CA000348916A patent/CA1148059A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |