CN101328985B - Combined type current limiting valve - Google Patents
Combined type current limiting valve Download PDFInfo
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- CN101328985B CN101328985B CN2008101230838A CN200810123083A CN101328985B CN 101328985 B CN101328985 B CN 101328985B CN 2008101230838 A CN2008101230838 A CN 2008101230838A CN 200810123083 A CN200810123083 A CN 200810123083A CN 101328985 B CN101328985 B CN 101328985B
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- valve
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- valve spool
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Abstract
The invention discloses a combined type flow-limiting valve, which pertains to the technical field of fluid valves and aims at providing a flow-limiting valve with the functions of over flow rate protection, sealing enforcement, and manual uninstall and automatic turn-on. The technical points are that: the valve consists of a valve body, a main valve spool, a secondary valve spool and a valve rod, wherein, the main valve spool (2) is opened with a balance hole (14), the valve rod (11) is matched with a screwed hole at the center of a valve cover (7), the upper end of the valve rod (11) is connected with a handle (10), the lower end thereof is connected with the secondary valve spool (13), and the secondary valve spool is opposite to the balance hole at the center of the top end of the cylinder of the main valve spool. When the flow rate of a fluid media exceeds the set value, the main valve spool operates quickly to lead the flow-limiting valve to be closed, and the handle is rotated to exert an enforced closing force on the main valve spool, thus leading the media not to leak; when the fault is cleared, the handle is rotated to turn on the secondary valve spool, and then the media flows out of the flow-limiting valve through the balance hole; when the fore-and-aft media pressure of the valve spool is balanced, the main valve spool is turned on automatically under the action of a spring of the main valve spool, thus leading the flow-limiting valve to return to a safety protection state.
Description
Technical field
The present invention relates to a kind of flow-limiting valve, particularly a kind of combined type current limiting valve.
Background technique
Flow-limiting valve is the important accessory that guarantees the pressure vessel safety operation, break at the flowing medium conveyance conduit, or the device fails that is installed on control hydrodynamic pressure on the pipeline or flow can quick closedown when causing flowing medium to leak in a large number, with the pressure vessel outlet pipe sealing, avoid the medium in the pressurized container to leak in a large number.
In the tradition flow-limiting valve, playing the internals of metering function is made up of spool, operating spring and spring-adjusting nut etc., its working principle is: come the compressed action spring by the position of adjusting spring-adjusting nut, make spool be in fully open position, after the rate-of flow by spool surpasses certain value, suffered fluid medium pressure difference will be above the supporting force of spring to spool before and after the spool, the spool quick closedown, prevent that the medium in the pressurized container from leaking in a large number, at this moment, the sealing force between spool and the valve seat is produced by pressure medium fully.Because the pressure between spool and the valve seat is produced by pressure medium fully,, after the flow-limiting valve action is closed, the sealing face leakage of a certain amount of medium by flow-limiting valve will be arranged for the flow-limiting valve that works in low-pressure system.In addition; because the pressure medium in the pressurized container is pressed on the valve seat flow-limiting valve spool; after the pressure vessel outlet fault is got rid of, must discharge the medium in the pressurized container by alternate manner and make the pressure medium reduction, flow-limiting valve just can be returned to the safety protection state.In order to make flow-limiting valve can be returned to the safety protection state; flowing medium normally passes through flow-limiting valve; Chinese patent ZL00263295.0 has introduced a kind of valve body flow-limiting valve of bypass tube pressure release in addition; its structure is for driving mouth and outlet on flow-limiting valve housing outer wall; one of external bypass tube terminates at inlet; the other end is contained in the outlet port, mounted valve on the bypass tube.But, the flow-limiting valve complex structure of this band bypass tube, volume is big.
Summary of the invention
The object of the present invention is to provide a kind of flow-limiting valve that has super traffic protection function and forced seal function and manually unload automatic open function.
Its technological scheme is: a kind of combined type current limiting valve, comprise that screw thread is installed in valve body inner fluid entry end upside, main valve plug spring-leaf retainer with pod apertures, cylinder on the main valve plug that connects and composes by disk and cylinder, pass the center mounting hole on the main valve plug spring-leaf retainer, the disk that its lower end connects is relative with valve seat, its upper end is threaded with the main valve plug spring-adjusting nut, the main valve plug spring places on the cylinder of the main valve plug between main valve plug spring-adjusting nut and the main valve plug spring-leaf retainer, main valve plug and valve seat constitute the primary seal pair, it is characterized in that: the center of main valve plug from the disk end to the cylinder top has equalizing orifice, the valve gap center that is threaded with valve body has tapped hole, valve rod cooperates with the tapped hole of valve gap center, its upper end is connected with handle, the lower end is connected with auxiliary valve core, auxiliary valve core is relative with the equalizing orifice at center, main valve plug cylinder top, constitutes secondary sealing pair.
Its technique effect is: owing to adopt main valve plug and valve seat to constitute the primary seal pair, so when the flow of flowing medium surpasses setting value, the pressure reduction that flowing medium produces on main valve plug will be above the supporting force of main valve plug spring to main valve plug, the main valve plug quick acting is closed flow-limiting valve, the closing valve passage; Simultaneously owing to adopt the equalizing orifice at auxiliary valve core and center, main valve plug cylinder top to constitute secondary sealing pair, therefore, as long as handle with sleeve, auxiliary valve core is moved downward, can close the equalizing orifice on the main valve plug, and apply the compulsory power of closing to main valve plug, make the medium can not be by the sealing surface of flow-limiting valve, thus can not cause medium leakage; After the pressure vessel outlet fault was got rid of, handle with sleeve was opened auxiliary valve core; medium then flows out this flow-limiting valve by equalizing orifice; after treating the pressure medium balance of spool front and back, main valve plug is opened under the effect of main valve plug spring automatically, makes flow-limiting valve be returned to the safety protection state.And it is simple in structure, and volume is little.
Figure of description
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a closed condition schematic representation of the present invention.
Embodiment
As shown in Figure 1, this flow-limiting valve comprises that screw thread is installed in valve body 1 inner fluid entry end main valve plug spring-leaf retainer 3 upside, that have pod apertures, cylinder on the main valve plug 2 that connects and composes by disk and cylinder, pass the center mounting hole on the main valve plug spring-leaf retainer, the disk that its lower end connects is relative with valve seat 15, its upper end is threaded with main valve plug spring-adjusting nut 6, and main valve plug spring 5 places on the cylinder of the main valve plug between main valve plug spring-adjusting nut and the main valve plug spring-leaf retainer.By adjusting spring-adjusting nut, can regulate the support force of main valve plug spring to main valve plug.The center of main valve plug from the disk end to the cylinder top has equalizing orifice 14, valve gap 7 centers that are threaded with valve body have tapped hole, valve rod 11 cooperates with the tapped hole of valve gap center, its upper end is connected with handle 10, the lower end is connected with auxiliary valve core 13, and auxiliary valve core is relative with the equalizing orifice at center, main valve plug cylinder top.Valve rod 11 is structure as a whole with auxiliary valve core 13.
Joint between valve gap 7 and the valve body is provided with seal ring 4.Be provided with the seal arrangement that constitutes by filler 8, pressure ring 9 and pressure cap 12 between valve gap 7 and the valve rod 11.
Its working procedure is: when the flow of flowing medium was lower than setting value, flowing medium can normally pass through the passage that this current limliting is transferred by the illustrated flow direction of Fig. 1.If when the flow of flowing medium surpassed setting value, the pressure reduction that flowing medium produces on main valve plug will be above the supporting force of main valve plug spring to main valve plug, the main valve plug quick acting is closed flow-limiting valve.At this moment, handle with sleeve moves downward auxiliary valve core, closes on the one hand the equalizing orifice on the main valve plug, applies the compulsory power of closing to main valve plug on the other hand, makes the medium can not be by the sealing surface of flow-limiting valve, thus can not cause medium the leakage (see figure 2).
After the pressure vessel outlet fault was got rid of, handle with sleeve was opened auxiliary valve core, and medium then flows out this flow-limiting valve by equalizing orifice.After treating pressure medium balance after and before the valve, main valve plug is opened under the effect of main valve plug spring automatically, makes flow-limiting valve be returned to the safety protection state.
Claims (4)
1. combined type current limiting valve, comprise that screw thread is installed in valve body (1) inner fluid entry end upside, main valve plug spring-leaf retainer (3) with pod apertures, cylinder on the main valve plug (2) that connects and composes by disk and cylinder, pass the center mounting hole on the main valve plug spring-leaf retainer, the disk that its lower end connects is relative with valve seat (15), its upper end is threaded with main valve plug spring-adjusting nut (6), main valve plug spring (5) places on the cylinder of the main valve plug between main valve plug spring-adjusting nut and the main valve plug spring-leaf retainer, main valve plug and valve seat constitute the primary seal pair, it is characterized in that: the center of main valve plug (2) from the disk end to the cylinder top has equalizing orifice (14), the valve gap that is threaded with valve body (7) center has tapped hole, valve rod (11) cooperates with the tapped hole of valve gap center, its upper end is connected with handle (10), the lower end is connected with auxiliary valve core (13), auxiliary valve core is relative with the equalizing orifice at center, main valve plug cylinder top, constitutes secondary sealing pair.
2. combined type current limiting valve according to claim 1 is characterized in that: valve rod (11) is an overall structure with auxiliary valve core (13).
3. combined type current limiting valve according to claim 1 is characterized in that: the joint between valve gap (7) and the valve body is provided with seal ring (4).
4. combined type current limiting valve according to claim 1 is characterized in that: be provided with the seal arrangement that is made of filler (8), pressure ring (9) and pressure cap (12) between valve gap (7) and the valve rod (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101230838A CN101328985B (en) | 2008-06-20 | 2008-06-20 | Combined type current limiting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101230838A CN101328985B (en) | 2008-06-20 | 2008-06-20 | Combined type current limiting valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101328985A CN101328985A (en) | 2008-12-24 |
| CN101328985B true CN101328985B (en) | 2011-04-20 |
Family
ID=40204935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101230838A Active CN101328985B (en) | 2008-06-20 | 2008-06-20 | Combined type current limiting valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101328985B (en) |
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2008
- 2008-06-20 CN CN2008101230838A patent/CN101328985B/en active Active
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| Publication number | Publication date |
|---|---|
| CN101328985A (en) | 2008-12-24 |
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Address after: 230031 No. 888 Changjiang West Road, Hefei, Anhui Patentee after: HEFEI GENERAL MACHINERY RESEARCH INSTITUTE Co.,Ltd. Address before: 230031 No. 888 Changjiang West Road, Hefei, Anhui Patentee before: HEFEI GENERAL MACHINERY Research Institute |
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| CP01 | Change in the name or title of a patent holder |