CN1103147A - Pressure-differential piston automatic pressure-reducing valve with auxiliary control - Google Patents
Pressure-differential piston automatic pressure-reducing valve with auxiliary control Download PDFInfo
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- CN1103147A CN1103147A CN 94116230 CN94116230A CN1103147A CN 1103147 A CN1103147 A CN 1103147A CN 94116230 CN94116230 CN 94116230 CN 94116230 A CN94116230 A CN 94116230A CN 1103147 A CN1103147 A CN 1103147A
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- 230000009467 reduction Effects 0.000 claims description 20
- 230000007246 mechanism Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 42
- 230000008676 import Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
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Abstract
The invention belongs to a relief valve, which mainly comprises an adjusting screw, a spring, a piston, a main valve stem, a valve chamber, a main valve disc, an upper valve cover and a lower valve body. A by-pass pipe is extended from the high pressure inlet of the lower valve body. A control valve is arranged on the pipeline. A venturi nozzle is provided between the control valve and the by-pass pipe. A control tube, which comes out of the nozzle, extends into the valve chamber on the lower part of the piston. The outlet pipe of the control valve is connected with the low pressure outlet of the lower valve body. The overflowing section of the main valve disc is parabola type. The overflowing resistance of the relief valve is weak, and the resistance is just 0.07MPa, and the application scope of the pipe diameter is DN50-400mm, so the pressure adjustment is speed, swift, stable, no vibrating. The utility model is convenient to install, debug and maintain.
Description
The invention belongs to reduction valve, particularly be the band assist control pressure-differential piston automatic pressure-reducing valve.
For guaranteeing the requirement of each watering equipment to water supply flow and pressure, the import hydraulic pressure of water system is all bigger, for guaranteeing the safety of equipment, will install reduction valve additional at the equipment importation place in the industrial water supply system.As the hydraulic pressure at large hydropower station water source all be watering equipment import hydraulic pressure 2-4 doubly, so water at each position of hydraulic generator unit, water power plant, and the cooling of each watering equipment, lubricated water all need could use at the pre-installed reduction valve of equipment water intake.
The performance of homemade Pressure reducing valve for hot water and quality can not satisfy the requirement in water power plant, as: the water power plant technical water supply automatic pressure reducing valve of Hunan Province's water power designing institute development is that bivalve plug spring pressure film directly acts on, it belongs to the adjusting of sudden change formula, thereby the pressure adjusting function is not steady.Because the sudden change of valve port area of passage and the inertia of current in the adjustment process cause the sudden change of operating water valve outlet hydraulic pressure, must cause the pressure pulsation and the vibration of water valve and even water system current, what situation was serious also can cause water hammer.The fixed resistance of water valve is about 0.2-0.25MPa, and this has just limited its use, i.e. import water pressure must be greater than more than the 0.4MPa.
The electronic reduction valve of producing as: Shenyang High ﹠ Mediate Pressure Valve Factory of 79FY16 type of indirect acting type, mainly by the undulating value of pressure transmitter feedback valve outlet water pressure, the control motor changes the valve port area of passage for it, realizes the adjusting to its outlet hydraulic pressure.Poor by what secondary adjuster and electric actuator functional reliability, vibration is not steadily arranged during adjusting, and also all not durable, fragile, unfavorable water power plant safety and economic operation so above-mentioned valve is used in the water power plant that has when beginning, is used gate valve later on again instead.
How the domestic technical water supply of having built large medium-size station replaces reduction valve with gate valve, and manual tune opens and closes operating difficulties, easily produces water hammer, stuck phenomenon.For this reason, from China's water power plant water quality inferiority, actual conditions that flow fluctuation is big, a kind of simple in structure, Pressure reducing valve for hot water that self-regulation performance is good of the development of supporting oneself is the task of top priority of electric power development.
Goal of the invention of the present invention is: design a kind of reduction valve that pressure regulation is steady, simple in structure, self-regulation performance is good that can keep the outlet stable water pressure.
Main points of the present invention are: the pressure micro-adjusting mechanism changes the water pressure that acts on piston lower surface with this mechanism and the pressure reduction between the spring makes piston drive the main valve disc action being equipped with between the import and export of reduction valve.Valve port opening is gradual change thereupon also, realizes adjusting automatically the outlet hydraulic pressure of reduction valve thus.
Goal of the invention of the present invention is achieved in that a kind of pressure-differential piston automatic pressure-reducing valve with assist control of design is mainly by adjusting screw rod, spring, piston, main valve stem, valve chamber, main valve disc, bonnet, following valve body is formed, adjustment screw rod one end that is threaded with bonnet passes bonnet, the other end is fixed on the spring seat, one end seat of spring is on spring seat, the other end withstands on the piston, the upper side of piston is slidingly matched with the inner cylindrical surface that is contained in down the valve chamber in the valve body, the upper-end surface of valve chamber is fixed between the flange of bonnet and following valve body, one end of main valve stem is fixed on piston lower surface, the other end is rigidly connected by main valve disc under the valve chamber, a bypass tube is drawn at the high-pressure inlet place of following valve body, control valve is housed on the pipeline, be connected to the Venturi nozzle between control valve and the bypass tube, the control valve that picks out from nozzle causes the valve chamber of piston lower surface, and the outer pipe of control valve is connected to down the low tension outlet place of valve body.
The flow-passing surface of main valve disc is parabolic shape, is to determine that according to the waterpower calculating and the Structure Calculation of strictness control valve can be selected the spring diaphragm formula for use.
Piston, valve chamber, spring are formed the automatic control mechanism of reduction valve.The useful area of piston is greater than the useful area of main valve disc, and piston connects to one by valve rod and main valve disc rigidity.Below piston, all the time be subjected to a water pressure that makes progress, it is poor that this water pressure is exactly that the press water of reduction valve import acts on the water pressure of piston, main valve disc simultaneously, the pretightening force balance of this pressure difference and spring, make main valve disc have very desirable servo-actuated with respect to piston and automatic control mechanism, making main valve disc is steady, the friction of adjusting function of reduction valve.
Advantage of the present invention is:
1. using scope is wide: by the what main valve disc is through the preferred parabolic shape of strict calculating, its mistake flow resistance is little, therefore alternative scope is big, and the pipeline diameter that it uses is DN50-400MM, and the maximum of general Pressure reducing valve for hot water uses pipeline diameter to have only DN200MM.
2. the pressure regulator valve by the what assist control is a vernier element, regulates the lower end surface that hydraulic pressure acts directly on the valve chamber piston again, thus pressure regulation rapidly, sensitive, steadily, friction, outlet hydraulic pressure deviation be little, at 0.01MPa.
3. simple in structure, installation, debugging, operation, easy to maintenance, functional reliability is high, the economical operation of favourable what device security.
The invention will be described further below in conjunction with the accompanying drawing of embodiment and it:
Accompanying drawing 1, the structural drawing of the pressure-differential piston automatic pressure-reducing valve of band assist control, the number in the figure title is as follows:
1. adjustment screw rod; 2. spring; 3. piston; 4. valve chamber; 5. high pressure side; 6. main valve disc; 7. low voltage side; 8. bypass tube; 9. control valve; 10. film sheet; 11. assist control valve disc; 12. Venturi nozzle; 13. control valve; 14. main valve stem; 15. spring seat; 16. bonnet; 17. following valve body;
Shown in the figure mainly by adjusting screw rod (1), spring (2), piston (3), main valve stem (14), valve chamber (4), main valve disc (6), bonnet (16), the reduction valve that following valve body (17) is formed, adjustment screw rod one end that is threaded with bonnet passes bonnet, the other end is fixed on the spring seat (15), one end seat of spring is on spring seat, the other end withstands on the piston, the upper side of piston is slidingly matched with the inner cylindrical surface that is contained in down the valve chamber in the valve body, the upper-end surface of valve chamber is fixed between the flange of bonnet and following valve body, one end of main valve stem is fixed on piston lower surface, the other end is rigidly connected by valve chamber and main valve disc, a bypass tube (8) is drawn by the high pressure side of following valve body (5) inlet, the control valve of shock mount diaphragm type (9) on the pipeline, be connected to Venturi nozzle (12) between control valve and the bypass tube, the control valve (13) that picks out from nozzle causes the valve chamber of piston lower surface, and the outer pipe of control valve is connected to down the low voltage side of valve body (7) outlet port.Parts between high pressure side and low voltage side help out to pressure regulation.The flow-passing surface of main valve disc is parabolic shape, and streamflow regime is good, and it is little to cross flow resistance, has only 0.07MPa.
Reduction valve automatic Regulation process:
When reduction valve moves under nominal situation, when outlet hydraulic pressure reaches rating value, tension force, the low voltage side that water pressure on the high pressure side of valve acts on main valve disc (6), the high pressure water that is fallen overvoltage by Venturi nozzle (12) flow into the water pressure that acts in the valve chamber (4) below the piston, spring (2) through control valve (13) acts on the water pressure below the main valve disc (6), this four equilibrium of forces.At this moment, control of turning valve (9) also moves under nominal situation, and the press water of low voltage side directly acts on the following and little spring equilibrium of forces of film sheet (10).
If reduction valve outlet water pressure raises, the original balance of control valve (9) is promptly destroyed, water pressure below the film sheet (10) is greater than the compressive tension of little spring, film sheet (10) moves up and drives assist control valve disc (11) and turns down opening, flow in the bypass tube (8) reduces, the hydrostatic pressure at Venturi nozzle place rises, make in the valve chamber (4) and the following water pressure rising of piston (3), so main valve disc (6) servo-actuated moves on piston (3), reduce valve port opening, the energy dissipating of damming, the outlet hydraulic pressure that reduces reduction valve is to rating value.Otherwise when outlet hydraulic pressure descended, assist control valve disc (11) increased opening, and Venturi nozzle (12) is located hydrostatic pressure and descended, and main valve disc moves down the increase valve port opening, and reduction valve outlet water pressure rises to rating value thereupon.Like this, the automatic adjustment by the control valve film sheet causes the gradual change of valve port opening, thereby realizes that self-regulation performance is good, and pressure regulation is characteristics stably.Therefore no matter how reduction valve import hydraulic pressure fluctuates, and adopts this equipment can both keep exporting the stable of hydraulic pressure.
Claims (3)
1, a kind of pressure-differential piston automatic pressure-reducing valve with assist control is mainly by adjusting screw rod, spring, piston, upper valve rod, valve chamber, main valve disc, bonnet, following valve body is formed, adjustment screw rod one end that is threaded with bonnet passes bonnet, the other end is fixed on the spring seat, one end seat of spring is on spring seat, the other end withstands on the piston, the upper side of piston is slidingly matched with the inner cylindrical surface that is contained in down the valve chamber in the valve body, the upper-end surface of valve chamber is fixed between the flange of bonnet and following valve body, one end of main valve stem is fixed on piston lower surface, the other end is rigidly connected by valve chamber and main valve disc, it is characterized in that: between the high-pressure inlet of reduction valve and low tension outlet the pressure micro-adjusting mechanism is housed.
2, the pressure-differential piston automatic pressure-reducing valve of band assist control according to claim 1, it is characterized in that the pressure micro-adjusting mechanism is made of control valve, Venturi nozzle, control valve, bypass tube, draw a bypass tube from the high-pressure inlet of following valve body, control valve is housed on the pipeline, be connected to the Venturi nozzle between control valve and the bypass tube, the control valve that picks out from nozzle causes the valve chamber of piston lower surface, and the outer pipe of control valve is connected to down the low tension outlet place of valve body.
3, according to claim 1, the pressure-differential piston automatic pressure-reducing valve of 2 described band assist control is characterized in that: the flow-passing surface of main valve disc is parabolic shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94116230 CN1032603C (en) | 1994-09-29 | 1994-09-29 | Pressure-differential piston automatic pressure-reducing valve with auxiliary control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94116230 CN1032603C (en) | 1994-09-29 | 1994-09-29 | Pressure-differential piston automatic pressure-reducing valve with auxiliary control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1103147A true CN1103147A (en) | 1995-05-31 |
| CN1032603C CN1032603C (en) | 1996-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94116230 Expired - Fee Related CN1032603C (en) | 1994-09-29 | 1994-09-29 | Pressure-differential piston automatic pressure-reducing valve with auxiliary control |
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| Country | Link |
|---|---|
| CN (1) | CN1032603C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102929304A (en) * | 2012-11-07 | 2013-02-13 | 济南格士高层供暖节能技术有限公司 | Hydraulic power self-balancing device |
| CN106439124A (en) * | 2015-08-12 | 2017-02-22 | 湘潭中基电站辅机制造有限公司 | Multi-functional pressure release valve |
| CN106439133A (en) * | 2015-08-12 | 2017-02-22 | 湘潭中基电站辅机制造有限公司 | Piston type water hammer pressure release valve |
| CN113251184A (en) * | 2021-05-12 | 2021-08-13 | 广东电网有限责任公司 | Protective device |
-
1994
- 1994-09-29 CN CN 94116230 patent/CN1032603C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102929304A (en) * | 2012-11-07 | 2013-02-13 | 济南格士高层供暖节能技术有限公司 | Hydraulic power self-balancing device |
| CN102929304B (en) * | 2012-11-07 | 2015-01-14 | 姜玉璞 | Hydraulic power self-balancing device |
| CN106439124A (en) * | 2015-08-12 | 2017-02-22 | 湘潭中基电站辅机制造有限公司 | Multi-functional pressure release valve |
| CN106439133A (en) * | 2015-08-12 | 2017-02-22 | 湘潭中基电站辅机制造有限公司 | Piston type water hammer pressure release valve |
| CN113251184A (en) * | 2021-05-12 | 2021-08-13 | 广东电网有限责任公司 | Protective device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032603C (en) | 1996-08-21 |
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