CN116263216A - Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation - Google Patents

Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation Download PDF

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Publication number
CN116263216A
CN116263216A CN202211554322.1A CN202211554322A CN116263216A CN 116263216 A CN116263216 A CN 116263216A CN 202211554322 A CN202211554322 A CN 202211554322A CN 116263216 A CN116263216 A CN 116263216A
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Prior art keywords
valve
pressure
rigidity
output
spring
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Pending
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CN202211554322.1A
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Chinese (zh)
Inventor
柴为民
陈永新
周云忠
杨军
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Hangzhou Chunjiang Valve Co ltd
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Hangzhou Chunjiang Valve Co ltd
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Priority to CN202211554322.1A priority Critical patent/CN116263216A/en
Publication of CN116263216A publication Critical patent/CN116263216A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/20—Excess-flow valves
    • F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
    • F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
    • F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
    • F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Fluid Pressure (AREA)

Abstract

The invention discloses a pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation, which comprises a pressure reducing valve and a pilot valve, wherein a pressure regulating spring and a stiffness adjustable spring are arranged in the pilot valve; the input port of the pressure reducing valve is connected with the control cavity and the inlet of the pilot valve after passing through the adjustable throttle valve through the connecting pipeline, and the output port is connected with the output pressure feedback interface of the pilot valve after passing through the stop valve through the connecting pipeline. The output pressure of the pressure reducing valve of the invention positively fluctuates along with the output flow, when the water flow is large, the output pressure is large, and when the water flow is small, the output pressure is small, thereby reducing the pressure born by the whole pipeline system when the water is low, reducing the water leakage and pipe bursting rate of the pipeline, improving the reliability of the water supply system and reducing the maintenance cost.

Description

Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation.
Background
When the fluid is depressurized through the common depressurization valve, the output pressure is not changed along with the fluctuation of the flow, which is necessary in most cases, but is not desirable in some special cases, for example, because the water pressure of a water supply network is too high, the pressure is required to be depressurized when the building is supplied, when the common depressurization valve is used for depressurization, the depressurized output pressure is required to be equal to or larger than the water pressure at the time of water use peak, and the high water pressure is not required in practice when the water use valley, but because the output pressure of the depressurization valve is not changed along with the fluctuation of the flow, the whole pipeline system is subjected to the high pressure when the water use valley, so that the water leakage and pipe bursting rate of pipelines, particularly low-layer pipelines, are increased, energy and resources are wasted, and maintenance cost is increased.
Disclosure of Invention
The invention is designed for solving the technical defects of the common pressure reducing valve, and has the innovation point that the top end of the common pressure reducing valve with the speed of 200X is connected with a pilot valve in series, and the opening of the valve port of the pilot valve is controlled by utilizing the change of the opening of the main valve when the flow is changed, so that the output pressure of the pressure reducing valve positively fluctuates along with the output flow and is matched.
The invention aims to solve the technical problems, and adopts the technical scheme that the pressure reducing valve with the output pressure positively fluctuated along with the fluctuation of the output flow comprises a pressure reducing valve and a pilot valve, wherein the internal thread of a boss at the top end of an upper valve cover of the pressure reducing valve is in threaded connection with the external thread at the lower end of a lower valve body of the pilot valve, the vertical central lines of the two after the threaded connection are consistent, the pilot valve is internally provided with a pressure regulating spring and a rigidity-adjustable spring, the movement of a valve rod of the pressure reducing valve pushes the rigidity-adjustable spring in the pilot valve through a push rod, and further the movement of the pressure regulating spring is pushed, and the rigidity of the rigidity-adjustable spring is smaller than that of the pressure regulating spring. The structure of the pressure reducing valve is basically the same as that of a 200X type pressure reducing valve, and the main difference is that a push rod is arranged above the top end of a valve rod, an O-shaped sealing ring is arranged on the outer diameter of the push rod, a stepped small shaft is arranged at the upper end of the push rod, a gasket is sleeved on the small shaft, and a check ring is positioned. The input port (pressure P1) of the pressure reducing valve is connected with the inlets of the control cavity and the pilot valve through corresponding connecting pipelines and an adjustable throttle valve; the output port (pressure P2) is connected with the output pressure feedback interface of the pilot valve after passing through the stop valve through the corresponding connecting pipeline.
Further, the structure of the pilot valve is basically the same as that of a common adjustable pressure reducing valve, and the main difference is that a sleeve with an outer convex ring at the lower end is arranged in a valve cavity of a lower valve body, a through hole is arranged on a top plate of the sleeve, one side of the lower part is provided with a long groove, a rigidity adjustable spring is arranged in an inner cavity of the sleeve, and the width of the long groove is equal to the wire diameter of the rigidity adjustable spring; the lower end of the spring with adjustable rigidity is supported on a gasket at the top end of the push rod, and the spring head is inserted into a long groove at one side of the lower part of the sleeve so as to prevent the spring with adjustable rigidity from rotating; the spring rings at the upper part of the rigidity-adjustable spring are screwed in the spiral grooves which are movably matched with the inner hole of the sleeve and are positioned on the surface of the plunger above the inner hole, and the pitch and the depth of the spiral grooves are matched with the rigidity-adjustable spring.
Further, the top end of the plunger is abutted against the top surface of the sleeve, an inner hexagonal hole is formed in the top end of the plunger, and the number of turns of the spring with adjustable rigidity can be changed by rotating the plunger, so that the effective work turns of the spring with adjustable rigidity can be changed, and the rigidity of the spring with adjustable rigidity can be changed; the lower end of the pressure regulating spring of the pilot valve is supported on the outer convex ring of the sleeve.
The working principle of the invention is as follows: when the flow passing through the pressure reducing valve is increased, the opening of the main valve port is increased by means of the kinetic energy of a medium, so that the main valve core pushes the valve rod and the push rod to move upwards, the gasket at the upper end of the push rod compresses the spring with adjustable rigidity, the gasket is forced on the pressure regulating spring through the outer convex ring of the sleeve, the opening of the valve port of the pilot valve is increased, the flow of the medium discharged out of the pilot valve is increased, the pressure in the control cavity is released to some extent, the pressure is reduced, the main valve core is increased under the action of pressure difference, the opening of the main valve port is increased, and the output pressure P2 is increased along with the valve rod; conversely, when the flow rate through the pressure reducing valve decreases, the opening degree of the main valve port decreases, and the output pressure P2 decreases accordingly; closing the stop valve, leading the valve port of the pilot valve to have no medium circulation, controlling the pressure in the cavity to rise, closing the valve port of the main valve, and stopping downstream water supply; therefore, when the pressure reducing valve is used in the occasion of large water supply flow change, the output pressure is high when the water flow is high (water peak), and the output pressure is low when the water flow is low (water valley), so that the pressure born by the whole pipeline system in the water valley is reduced, the water leakage and pipe explosion rate of pipelines, particularly low-layer pipelines, is reduced, the reliability of the water supply system is improved, and the maintenance cost is reduced.
The output pressure and the output flow of each specification of pressure reducing valve are matched with each other and correspond to each other one by one, and a small change of the opening of the valve port of the pilot valve can cause a large change of the output pressure. If the push rod directly pushes the pressure regulating spring, the change value of the opening of the valve port of the pilot valve is necessarily consistent with the change value of the opening of the main valve port, so that the output pressure P2 greatly fluctuates, and the output pressure P2 is not matched with the output flow. In order to match the two, the invention adopts the measures that the motion of the push rod firstly acts on the rigidity-adjustable spring through the gasket and then acts on the pressure-adjustable spring through the outer convex ring of the sleeve, and the rigidity of the rigidity-adjustable spring is smaller than that of the pressure-adjustable spring, so that the force ratio acting on the pressure-adjustable spring is smaller, and the change of the opening of the valve port of the pilot valve is smaller; in order to achieve accurate matching, the stiffness of the adjustable stiffness spring can be adjusted to adjust the force acting on the pressure adjusting spring, and the plunger is rotated to enable part of the turns of the adjustable stiffness spring to enter or exit the spiral groove of the plunger, so that the effective working turns of the adjustable stiffness spring are increased or decreased to change the stiffness of the adjustable stiffness spring.
The spring rate formula is as follows:
Figure BDA0003982050840000041
wherein: stiffness N/mm of P-spring
d-line diameter mm of spring
D-diameter mm of spring
Effective work turn number of n-spring
As can be seen from the formula (1), when the effective number of turns n of the spring increases, the spring rate decreases, and when the effective number of turns of the spring decreases, the spring rate increases.
The beneficial effects of the invention are as follows: the pressure reducing valve effectively solves the problems that the output pressure of the pressure reducing valve in the prior art is not changed by flow fluctuation, when the pressure reducing valve is applied to a water supply system, the whole pipeline system bears high pressure during water use peak when the pressure is low, the water leakage and pipe explosion rate of pipelines, particularly low-layer pipelines, is increased, energy and resources are wasted, and the maintenance cost is increased. The output pressure of the invention positively fluctuates along with the output flow, so that the pressure of the whole pipeline system can be reduced when the water is low, the water leakage and pipe explosion rate of pipelines, especially low-layer pipelines, are reduced, the reliability of the water supply system is improved, and the maintenance cost is saved.
Drawings
FIG. 1 is a schematic view of a pressure relief valve of the present invention;
FIG. 2 is a schematic diagram of a pilot valve above a pressure relief valve of the present invention.
In the figure: 1. pressure reducing valve, 2. Main valve core, 3. Valve rod, 4. Push rod, 5. Pilot valve, 6. Adjustable throttle valve, 7.O. Sealing ring, 8. Boss, 9. Nut, 10. Lower valve body, 11. Sleeve, 12. Plunger, 13. Pressure regulating spring, 14. Stiffness adjustable spring, 15. Retainer ring, 16. Gasket, 17. Stop valve, a. Spring head, b. Long slot, A. Inlet, B. Output pressure feedback interface, G. Control chamber, V. Main valve port, V 0 And a valve port of the pilot valve.
Detailed Description
The following describes a specific embodiment of the technical scheme of the present invention by way of examples and with reference to the accompanying drawings.
Example 1
In the embodiment 1 shown in fig. 1, a pressure reducing valve with output pressure in forward fluctuation along with output flow fluctuation comprises a pressure reducing valve 1, a pilot valve 5, an adjustable throttle valve 6, a stop valve 17, a plurality of connecting pipelines and the like, wherein external threads at the lower end of a lower valve body 10 of the pilot valve 5 are in threaded connection with internal threads of a boss 8 at the top end of a valve cover on the pressure reducing valve 1, after the external threads are in threaded connection, the vertical center line of the pressure reducing valve 1 is consistent with the vertical center line of the pilot valve 5, the pressure reducing valve 1 has the same structure as that of a 200X type pressure reducing valve, and the pressure reducing valve mainly comprises a push rod 4 arranged above the top end of a valve rod 3 connected with a main valve core 2, an O-shaped sealing ring 7 is arranged on the outer diameter of the push rod 4, a stepped small shaft is sleeved with a gasket 16, and the gasket 15 is positioned on the small shaft. The structure of the pilot valve 5 is shown in fig. 2, and is basically the same as that of a common adjustable pressure reducing valve, and the main difference is that a sleeve 11 with an outer convex ring at the lower end is arranged in a valve cavity of a lower valve body 10, a through hole is arranged on a top plate of the sleeve 11, one side of the lower part is provided with a long groove b, and the width of the long groove b is equal to the line diameter of a rigidity adjustable spring 14; the inner cavity of the sleeve 11 is provided with a rigidity-adjustable spring 14, the lower end of the rigidity-adjustable spring 14 is supported on a gasket 16 at the top end of the push rod 4, and a spring head a is inserted into a long groove b at the lower part of the sleeve 11 so as to prevent the rigidity-adjustable spring 14 from rotating; the spring rings at the upper part of the rigidity-adjustable spring 14 are screwed in the spiral grooves on the surface of the plunger 12 which are movably matched with the inner hole of the sleeve 11 and are positioned above the inner hole, and the pitch and the depth of the spiral grooves are basically consistent with those of the rigidity-adjustable spring 14. The top end of the plunger 12 abuts against the top surface of the sleeve 11. The top end of the spring is provided with an inner hexagonal blind hole, and the plunger 12 is rotated, so that part of the turns of the spring 14 with adjustable rigidity can enter or exit the spiral groove, thereby changing the effective work turns of the spring 14 with adjustable rigidity and changing the rigidity thereof; the lower end of the pressure regulating spring 13 of the pilot valve 5 is supported on the outer convex ring of the sleeve 11, the output pressure of the pressure reducing valve 1 under the rated flow can be regulated by rotating the lower valve body 10, and the pressure reducing valve is locked by the nut 9 after meeting the requirement.
The input port (pressure P1) of the pressure reducing valve 1 is connected with the control cavity G and the inlet A of the pilot valve 5 through corresponding connecting pipelines and an adjustable throttle valve 6; the output port (pressure P2) is connected with the output pressure feedback interface B of the pilot valve 5 through a corresponding connecting pipeline after passing through the stop valve 17.
When the pressure reducing valve works, when the flow passing through the pressure reducing valve 1 is increased, the opening degree of the main valve port V tends to be increased by the kinetic energy of a medium, so that the main valve core 2 pushes the valve rod 3 and the push rod 4 to move upwards, a gasket 16 at the upper end of the push rod 4 compresses a spring 14 with adjustable rigidity, and is forced to the pressure regulating spring 13 by the outer convex ring of the sleeve 11, so that the valve port V of the pilot valve is realized 0 The opening degree of the valve (5) increases, the flow rate of the discharge pilot valve (5) increases, the pressure in the control chamber (G) is released, the pressure decreases, the main valve element (2) rises due to the pressure difference, and the main valve opening (V) is openedThe opening degree increases, and the output pressure P2 increases accordingly; conversely, when the flow rate through the pressure reducing valve 1 decreases, the opening degree of the main valve port V decreases, and the output pressure P2 decreases accordingly. Therefore, when the pressure reducing valve is used in occasions with large flow changes such as water supply, the output pressure P2 is high when the water flow is high (water peak), and the output pressure is low when the water flow is low (water valley), so that the pressure born by the whole pipeline system in the water valley is reduced, the water leakage and pipe explosion rate of pipelines, particularly low-layer pipelines, is reduced, the reliability of the water supply system is improved, and the maintenance cost is reduced.
The output pressure and the output flow of each specification of pressure reducing valve are matched with each other and correspond to each other one by one, and the valve port V of the pilot valve 0 Small changes in opening degree may cause large changes in output pressure. If the push rod 4 directly pushes the pressure regulating spring 13, the valve port V of the pilot valve is necessarily caused 0 The variation of the opening is identical to that of the main valve opening V, which causes a large fluctuation of the output pressure P2, and the output pressure P2 is not matched with the output flow. In order to match the two, the invention adopts the measures that the movement of the push rod 4 firstly acts on the rigidity-adjustable spring 14 through the gasket 16, then acts on the pressure-adjusting spring 13 through the outer convex ring of the sleeve 11, and the rigidity of the rigidity-adjustable spring 14 is smaller than that of the pressure-adjusting spring 13, so that the force acting on the pressure-adjusting spring 13 is smaller, and the valve port V of the pilot valve is caused 0 The change of the opening degree is also smaller; to achieve an accurate match, the stiffness of the adjustable stiffness spring 14 may be adjusted to adjust the force acting on the pressure spring 13 by rotating the plunger 12 to cause a portion of the number of turns of the adjustable stiffness spring 14 to enter or exit the helical groove of the plunger 12, thereby increasing or decreasing the effective number of turns of the adjustable stiffness spring 14 and changing its stiffness.

Claims (5)

1. The utility model provides a relief pressure valve that output pressure is forward fluctuation along with output flow fluctuation, a serial communication port, including relief pressure valve (1) and pilot valve (5), the internal thread of upper valve gap top boss (8) of relief pressure valve (1) and the external screw thread spiro union of the lower valve body (10) lower extreme of pilot valve (5), the perpendicular central line between them is unanimous after the spiro union, be equipped with pressure regulating spring (13) and rigidity adjustable spring (14) in pilot valve (5), the action of valve rod (3) of relief pressure valve (1) directly promotes rigidity adjustable spring (14) in pilot valve (5), rigidity adjustable spring (14) rigidity is less than the rigidity of pressure regulating spring (13) of pilot valve (5).
2. The pressure reducing valve with the forward fluctuation of output pressure along with the fluctuation of output flow according to claim 1, wherein a push rod (4) is arranged above the top end of a valve rod (3) of the pressure reducing valve (1), an O-shaped sealing ring (7) is arranged on the outer diameter of the push rod (4), a small stepped shaft is arranged at the upper end of the push rod (4), a gasket (16) is sleeved on the small stepped shaft, and a retainer ring (15) is positioned.
3. The pressure reducing valve with the output pressure positively fluctuated along with the fluctuation of the output flow according to claim 2 is characterized in that a sleeve (11) with an outer convex ring at the lower end is arranged in a valve cavity of a lower valve body (10) of a pilot valve (5), a through hole is arranged on a top plate of the sleeve (11), a long groove (b) is arranged on one side of the lower part, a rigidity-adjustable spring (14) is arranged in an inner cavity of the sleeve (11), and the width of the long groove (b) is equal to the line diameter of the rigidity-adjustable spring (14); the lower end of the rigidity-adjustable spring (14) is supported on a gasket (16) at the top end of the push rod (4), and a spring head (a) is inserted into a long groove (b) at one side of the lower part of the sleeve (11) so as to prevent the rigidity-adjustable spring (14) from rotating; the spring rings at the upper part of the rigidity-adjustable spring (14) are screwed in the spiral grooves on the surface of the plunger (12) which is movably matched with the inner hole of the sleeve (11) and is positioned above the inner hole, and the pitch and the depth of the spiral grooves are matched with the rigidity-adjustable spring (14).
4. The pressure reducing valve with the output pressure positively fluctuated along with the fluctuation of the output flow according to claim 3, characterized in that the top end of the plunger (12) is abutted against the top surface of the sleeve (11), the top end of the plunger (12) is provided with a hexagon socket, the number of turns of the rigidity-adjustable spring (14) can be changed by rotating the plunger (12), so as to change the effective number of turns of the rigidity-adjustable spring (14) and change the rigidity of the rigidity-adjustable spring (14); the lower end of a pressure regulating spring (13) of the pilot valve (5) is supported on the outer convex ring of the sleeve (11).
5. The pressure reducing valve with the output pressure positively fluctuating along with the fluctuation of the output flow according to claim 1, is characterized in that an input port of the pressure reducing valve (1) is connected with an inlet port (A) of a control cavity (G) and a pilot valve (5) through a corresponding connecting pipeline after passing through an adjustable throttle valve (6); the output port is connected with an output pressure feedback interface (B) of the pilot valve (5) through a corresponding connecting pipeline after passing through a stop valve (17).
CN202211554322.1A 2022-12-06 2022-12-06 Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation Pending CN116263216A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211554322.1A CN116263216A (en) 2022-12-06 2022-12-06 Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211554322.1A CN116263216A (en) 2022-12-06 2022-12-06 Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation

Publications (1)

Publication Number Publication Date
CN116263216A true CN116263216A (en) 2023-06-16

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ID=86723778

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211554322.1A Pending CN116263216A (en) 2022-12-06 2022-12-06 Pressure reducing valve with output pressure positively fluctuating along with output flow fluctuation

Country Status (1)

Country Link
CN (1) CN116263216A (en)

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