CN1032603C - 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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- CN1032603C CN1032603C CN 94116230 CN94116230A CN1032603C CN 1032603 C CN1032603 C CN 1032603C CN 94116230 CN94116230 CN 94116230 CN 94116230 A CN94116230 A CN 94116230A CN 1032603 C CN1032603 C CN 1032603C
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Abstract
The present invention belongs to a pressure reducing valve which is mainly composed of an adjusting screw, a spring, a piston, a main valve rod, a valve chamber, a main valve disc, an upper valve cover and a lower valve body. A by-pass pipe is introduced from the part of a high pressure inlet of the lower valve body. A control valve is arranged on the pipeline. A venturi nozzle is arranged between the control valve and the by-pass pipe. A control pipe from the nozzle is introduced into the valve chamber on the lower end surface of the piston. An outlet pipe of the control valve is connected with a low pressure outlet of the lower valve body. The overflowing surface of the main valve disc is in a parabola shape. The overflowing resistance of the pressure reducing valve is little and is only 0.07MPa, and the applying range of the pipe diameter DN is from 50 to 400mm. The pressure adjustment is rapid, sensitive and stable without vibration. The installation, the adjustment and the maintenance are convenient.
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.
The name be called the ＂ reduction valve columniation structure ＂ CN87 105543 A patent disclosures draw a bypass tube at the high-pressure inlet place of valve body, the pressure micro-adjusting mechanism is housed on the pipeline, this mechanism is made up of control valve, diaphragm, spring and corresponding spring seat, and outer pipe is connected to down the low tension outlet place of valve body.
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 and a kind ofly can keep outlet stable water pressure, simple in structure, reduction valve that self-regulation performance is good.
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 valve chamber and main valve disc, a bypass tube is drawn at high-pressure inlet place at following valve body, control valve is housed on the pipeline, the outer pipe of control valve is connected to down the low tension outlet place of valve body, 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.
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.
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:
The structural drawing of the pressure-differential piston automatic pressure-reducing valve of accompanying drawing 1. 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 high pressure side 5 inlets of following valve body, the control valve 9 of shock mount diaphragm type on the pipeline, be connected to Venturi nozzle 12 between the bypass tube of control valve and high-pressure inlet side, 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 low voltage side 7 outlet ports of valve body.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, 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, the tension force of spring 2, the low voltage side that act in the valve chambers 4 below the piston through control valve 13 and act 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 of film sheet 10 and little spring equilibrium of forces.
If reduction valve outlet water pressure raises, control valve 9 original balances are promptly destroyed, water pressure below the film sheet 10 is greater than the compressive tension of little spring, and film sheet 10 moves up and drives assist control valve disc 11 and turns down opening, and the flow in the bypass tube 8 reduces, the hydrostatic pressure at Venturi nozzle place rises, make in the valve chamber 4 and piston 3 following water pressures risings,, reduce valve port opening on piston 3 so main valve disc 6 servo-actuateds move, 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 place's hydrostatic pressures descend, 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 (2)
- One kind with the pressure-differential piston automatic pressure-reducing valve of assist control mainly by adjusting screw rod, spring, piston, main valve, 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, a bypass tube is drawn at high-pressure inlet place at following valve body, control valve is housed on the pipeline, the outer pipe of control valve is connected to down the low tension outlet place of valve body, it is characterized in that: 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.
- 2. the pressure-differential piston automatic pressure-reducing valve of band assist control according to claim 1 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 CN1103147A (en) | 1995-05-31 |
| CN1032603C true CN1032603C (en) | 1996-08-21 |
Family
ID=5037819
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 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032603C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113251184B (en) * | 2021-05-12 | 2023-01-24 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| CN1103147A (en) | 1995-05-31 |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |