CN107246498B - Double pilot valve control system and control method for pressure reducing valve of water supply system - Google Patents
Double pilot valve control system and control method for pressure reducing valve of water supply system Download PDFInfo
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- CN107246498B CN107246498B CN201710619113.3A CN201710619113A CN107246498B CN 107246498 B CN107246498 B CN 107246498B CN 201710619113 A CN201710619113 A CN 201710619113A CN 107246498 B CN107246498 B CN 107246498B
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Classifications
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
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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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
Abstract
The invention discloses a double pilot valve control system and a control method for a pressure reducing valve of a water supply system, wherein the double pilot valve control system comprises a main valve, a pressure-charging pilot valve and a pressure-releasing pilot valve; the two pilot valves feed back the pressure of the main valve outlet pipe of the pressure reducing valve, the set value of the pressure-increasing pilot valve is larger than the pressure-reducing pilot valve, and when the pressure of the main valve outlet pipe is larger than the set value of the action pressure of the pressure-increasing pilot valve, the opening of the main valve disk is reduced to reduce the pressure behind the valve; when the pressure of the main valve outlet pipe is smaller than the action pressure set value of the pressure relief pilot valve, the opening degree of the main valve disc is increased to improve the pressure behind the valve. And finally, stabilizing the pressure of the water outlet pipe of the main valve of the pressure reducing valve between the action pressure set values of the two pilot valves.
Description
Technical Field
The invention belongs to the field of hydraulic valves, and particularly relates to a double pilot valve control system and a control method for a pressure reducing valve of a water supply system.
Background
The control system of the existing water supply system pressure reducing valve usually has only one pilot valve, the pilot valve feeds back the pressure of the main valve outlet pipe of the pressure reducing valve and compares the pressure with a set value of a spring, so that the flow of the pilot valve to the main valve outlet pipe is adjusted in real time, the pressure of a main valve control cavity is adjusted, the opening of the main valve is controlled, and the pressure of the main valve outlet pipe can be stabilized near the set value. The pilot valve in the control system is always in an overcurrent state, and the valve shaft, the overcurrent sealing surface and the like in the pilot valve can be damaged by cavitation during long-term operation, so that the pilot valve cannot work normally and the stable operation of the pressure reducing valve is influenced.
Disclosure of Invention
The invention aims to provide a double-pilot valve control system and a control method for a pressure reducing valve of a water supply system. The two pilot valves feed back the pressure of the main valve outlet pipe of the pressure reducing valve, the set value of the pressure-increasing pilot valve is larger than the pressure-reducing pilot valve, and when the pressure of the main valve outlet pipe is larger than the set value of the action pressure of the pressure-increasing pilot valve, the opening of the main valve disk is reduced to reduce the pressure behind the valve; when the pressure of the main valve outlet pipe is smaller than the action pressure set value of the pressure relief pilot valve, the opening degree of the main valve disc is increased to improve the pressure behind the valve. And finally, stabilizing the pressure of the water outlet pipe of the main valve of the pressure reducing valve between the action pressure set values of the two pilot valves.
In order to achieve the technical characteristics, the aim of the invention is realized in the following way: a double pilot valve control system for a pressure reducing valve of a water supply system comprises a main valve, a pressurizing pilot valve and a pressure releasing pilot valve;
the main valve water inlet pipe of the main valve is communicated with the pressure-increasing pilot valve water inlet pipe of the pressure-increasing pilot valve through a communicating pipe, and the main valve water outlet pipe of the main valve is simultaneously communicated with the pressure-increasing pilot valve pressure sensing pipe of the pressure-increasing pilot valve and the pressure-releasing pilot valve water outlet pipe of the pressure-releasing pilot valve through a communicating pipe;
and the water outlet pipe of the pressurizing pilot valve is simultaneously communicated with the main valve control cavity of the main valve and the water inlet pipe of the pressure relief pilot valve.
The middle part of the valve rod of the main valve is provided with a main valve diaphragm, the tail end of the valve rod is provided with a main valve disk, the upper cavity of the main valve diaphragm of the main valve forms a main valve control cavity, and the main valve disk is arranged between a main valve water inlet pipe and a main valve water outlet pipe.
The pressure-increasing pilot valve comprises a pressure-increasing pilot valve diaphragm, wherein a pressure-increasing pilot valve spring is arranged in an upper cavity of the pressure-increasing pilot valve diaphragm, an adjusting bolt for adjusting the elasticity of the spring is arranged at the top of the pressure-increasing pilot valve spring, a pressure-increasing pilot valve intercepting disc is arranged on the lower end face of the pressure-increasing pilot valve diaphragm, and the pressure-increasing pilot valve intercepting disc is matched with a pressure-increasing pilot valve water outlet pipe; a pressure sensing tube of the pressure pilot valve is communicated with a cavity at the lower part of a diaphragm of the pressure pilot valve in the pressure pilot valve; and a pressure pilot valve needle valve is arranged between the water outlet pipe of the pressure pilot valve and a cavity where the shutoff disc of the pressure pilot valve is positioned.
The pressure relief pilot valve comprises a pressure relief pilot valve diaphragm, a pressure relief pilot valve spring is arranged in an upper cavity of the pressure relief pilot valve diaphragm, an adjusting bolt for adjusting spring force is arranged at the top of the pressure relief pilot valve spring, and a pressure relief pilot valve shutoff disc is arranged on the lower end face of the pressure relief pilot valve diaphragm; a pressure relief pilot valve diaphragm lower cavity inside the pressure relief pilot valve is communicated with a pressure relief pilot valve water outlet pipe; and a pressure relief pilot valve needle valve is arranged between the pressure relief pilot valve water inlet pipe and the cavity where the pressure relief pilot valve closure disc is arranged.
The control method of the double pilot valve control system for the pressure reducing valve of any water supply system is adopted, and comprises the following steps:
step1: adjusting the top adjusting bolts of the pressurizing pilot valve and the pressure relief pilot valve to enable the action pressure set value P1 of the pressurizing pilot valve to be larger than the action pressure set value P2 of the pressure relief pilot valve diaphragm 3 b;
step2: when the pressure of the main valve water outlet pipe of the main valve is larger than P1, the shutoff disc of the pressurizing pilot valve moves upwards, so that the water inlet pipe of the pressurizing pilot valve is communicated with the water outlet pipe of the pressurizing pilot valve; meanwhile, the pressure relief pilot valve closure disc is positioned at the uppermost end, and the pressure relief pilot valve water inlet pipe is disconnected with the pressure relief pilot valve water outlet pipe; at the moment, the main valve water inlet pipe fills water into the main valve control cavity through the pressurizing pilot valve, so that the main valve disc moves downwards, and the pressure of the main valve water outlet pipe is reduced until the pressure is smaller than P1;
step3: when the pressure of the main valve water outlet pipe is smaller than P2, the shutoff disc of the pressurizing pilot valve is at the lowest end, so that the water inlet pipe of the pressurizing pilot valve is disconnected with the water outlet pipe of the pressurizing pilot valve; simultaneously, the pressure relief pilot valve closure disc moves downwards, so that the pressure relief pilot valve water inlet pipe is communicated with the pressure relief pilot valve water outlet pipe; at the moment, the control cavity of the main valve discharges water to the water outlet pipe of the main valve through the pressure relief pilot valve, so that the main valve disc moves upwards, and the pressure of the water outlet pipe of the main valve is increased until the pressure is larger than P2;
step4: the pressure of the main valve water outlet pipe can be stabilized between P1 and P2 through the automatic regulation process of Step 1-Step 3, at the moment, the shutoff disc of the pressurizing pilot valve is at the lowest end, and the water inlet pipe of the pressurizing pilot valve is disconnected with the water outlet pipe of the pressurizing pilot valve; meanwhile, the shutoff disc of the pressure relief pilot valve is positioned at the uppermost end, and the water inlet pipe of the pressure relief pilot valve is disconnected with the water outlet pipe of the pressure relief pilot valve, so that the control cavity of the main valve is not filled with water or drained, and the opening degree of the main valve disc is kept unchanged;
step5: the opening of the pressure-charging pilot valve needle valve and the opening of the pressure-discharging pilot valve needle valve are adjusted, and the water filling speed and the water discharging speed of the control cavity of the main valve can be respectively adjusted, so that the reaction speed of the main valve is adjusted.
The invention has the following beneficial effects:
1. the double-pilot valve control system for the pressure reducing valve of the water supply system mainly comprises a pressurizing pilot valve, a pressure reducing pilot valve and a control pipeline, wherein the two pilot valves feed back the pressure of a main valve outlet pipe of the pressure reducing valve, the set value of the pressurizing pilot valve is larger than that of the pressure reducing pilot valve, and when the pressure of the main valve outlet pipe is larger than the set value of the action pressure of the pressurizing pilot valve, the opening of a main valve disk is reduced to reduce the pressure behind the valve; when the pressure of the main valve outlet pipe is smaller than the action pressure set value of the pressure relief pilot valve, the opening degree of the main valve disc is increased to improve the pressure behind the valve; and finally, stabilizing the pressure of the water outlet pipe of the main valve of the pressure reducing valve between the action pressure set values of the two pilot valves.
2. Through the double pilot valve control system, when the double pilot valve control system operates under a stable working condition, the pressure of the water outlet pipe of the main valve is stabilized between P1 and P2 for a long time, at the moment, the control cavity 1a of the main valve is in a closed state, no overcurrent exists in the two pilot valves, and cavitation is not easy to occur at the positions of the valve shaft, the overcurrent sealing surface and the like in the pilot valve, so that the double pilot valve control system has better stability and longer service life.
3. When the pressure of the main valve water outlet pipe is higher than P1, the main valve water inlet pipe fills water into the main valve control cavity through the pressurizing pilot valve; when the pressure of the main valve water outlet pipe is lower than P2, the main valve control cavity drains water to the main valve water outlet pipe through the pressure relief pilot valve; when the main valve outlet pipe pressure is lower than P1 but higher than P2, the main valve control chamber is neither filled nor drained.
Drawings
The invention is further described below with reference to the drawings and examples.
FIG. 1 is a schematic diagram of a control system according to the present invention.
In the figure: 1. a main valve; 1a, a main valve control chamber; 1b, a main valve diaphragm; 1c, a main valve disc; 1d, a main valve water inlet pipe; 1e, a main valve water outlet pipe;
2. pressurizing the pilot valve; 2a, pressurizing a pilot valve spring; 2b, pressurizing a pilot valve diaphragm; 2c, a pressure sensing tube of the pressurizing pilot valve; 2d, a pressure-charging pilot valve water inlet pipe; 2e, a shutoff disc of the pressurizing pilot valve; 2f, a pressurizing pilot valve needle valve; 2g, a water outlet pipe of the pressurizing pilot valve;
3. a pressure relief pilot valve; 3a, a pressure release pilot valve spring; 3b, a pressure release pilot valve diaphragm; 3c, a water outlet pipe of the pressure relief pilot valve; 3d, a pressure relief pilot valve shutoff disc; 3e, a pressure release pilot valve water inlet pipe; 3f, a pressure release pilot valve needle valve.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
Example 1:
as shown in figure 1, a double pilot valve control system for a pressure reducing valve of a water supply system comprises a main valve 1, a pressure charging pilot valve 2 and a pressure releasing pilot valve 3;
further, a main valve water inlet pipe 1d of the main valve 1 is communicated with a pressure-charging pilot valve water inlet pipe 2d of the pressure-charging pilot valve 2 through a communicating pipe, and a main valve water outlet pipe 1e of the main valve 1 is simultaneously communicated with a pressure-charging pilot valve pressure sensing pipe 2c of the pressure-charging pilot valve 2 and a pressure-discharging pilot valve water outlet pipe 3c of the pressure-discharging pilot valve 3 through a communicating pipe;
further, the pressurizing pilot water outlet pipe 2g of the pressurizing pilot 2 is simultaneously communicated with the main valve control cavity 1a of the main valve 1 and the pressure relief pilot water inlet pipe 3e of the pressure relief pilot 3.
Further, a main valve diaphragm 1b is installed in the middle of a valve rod of the main valve 1, a main valve disc 1c is installed at the tail end of the valve rod, a main valve control cavity 1a is formed on an upper cavity of the main valve diaphragm 1b of the main valve 1, and the main valve disc 1c is arranged between a main valve water inlet pipe 1d and a main valve water outlet pipe 1 e.
Further, the pressurizing pilot valve 2 comprises a pressurizing pilot valve diaphragm 2b, wherein an upper cavity of the pressurizing pilot valve diaphragm 2b is provided with a pressurizing pilot valve spring 2a, the top of the pressurizing pilot valve spring 2a is provided with an adjusting bolt for adjusting spring force, the lower end surface of the pressurizing pilot valve diaphragm 2b is provided with a pressurizing pilot valve interception plate 2e, and the pressurizing pilot valve interception plate 2e is matched with a pressurizing pilot valve water outlet pipe 2 g; the lower cavity of the pressure-charging pilot valve diaphragm 2b inside the pressure-charging pilot valve 2 is communicated with a pressure-charging pilot valve pressure-sensing tube 2c; a pressurizing pilot valve needle valve 2f is arranged between the water outlet pipe 2g of the pressurizing pilot valve and the cavity where the intercepting disc 2e of the pressurizing pilot valve is positioned.
Further, the pressure relief pilot valve 3 comprises a pressure relief pilot valve diaphragm 3b, a pressure relief pilot valve spring 3a is installed in an upper cavity of the pressure relief pilot valve diaphragm 3b, an adjusting bolt for adjusting spring force is installed at the top of the pressure relief pilot valve spring 3a, and a pressure relief pilot valve intercepting disc 3d is installed on the lower end face of the pressure relief pilot valve diaphragm 3 b; the lower cavity of the pressure relief pilot valve diaphragm 3b inside the pressure relief pilot valve 3 is communicated with a pressure relief pilot valve water outlet pipe 3c; and a pressure relief pilot valve needle valve 3f is arranged between the pressure relief pilot valve water inlet pipe 3e and the cavity where the pressure relief pilot valve closure disc 3d is arranged.
Example 2:
the description will be made with a diaphragm-type pressure reducing valve as the main valve 1, and the case of piston-type pressure reduction is similar. The main valve control chamber 1a is internally provided with a main valve diaphragm 1b, and the main valve disk 1c can move up and down along with the main valve diaphragm 1 b.
Further, the top adjusting bolt of the pressurizing pilot valve 2 can adjust the pre-compression force of the pressurizing pilot valve spring 2a, so as to adjust the action pressure set value of the pressurizing pilot valve; the pressure of the induction main valve water outlet pipe 1e below the pressure-charging pilot valve diaphragm 2b can pass through the pressure-charging pilot valve pressure sensing valve 2c, and the pressure is compared with a set value. When the induction pressure is lower than a set value, the shutoff disc 2e of the pressurizing pilot valve is at the lowest end, and the water inlet pipe 2d of the pressurizing pilot valve is disconnected with the water outlet pipe 2g of the pressurizing pilot valve; when the sensed pressure is higher than the set value, the pressurizing pilot valve intercepting disc 2e is in upward movement, and the pressurizing pilot valve water inlet pipe 2d is communicated with the pressurizing pilot valve water outlet pipe 2 g. The pressurizing pilot valve needle valve 2f is used for adjusting the water inflow rate of the pressurizing pilot valve water inlet pipe 2 e.
Further, the pressure relief pilot valve 3 is similar in structure to the pressure charging pilot valve 2, but differs in two ways. Firstly, the pressure release pilot valve water outlet pipe 3c is a water outlet pipeline of the pressure release pilot valve 3, and simultaneously feeds back the pressure of the main valve water outlet pipe 1e to the lower part of the pressure release pilot valve diaphragm 3 b. Secondly, the pressure relief pilot valve intercepting disc 3d is opposite to the pressure charging pilot valve intercepting disc 2d in that the pressure relief pilot valve water inlet pipe 3e is disconnected from the pressure relief pilot valve pressure sensing pipe 3c when the pressure relief pilot valve intercepting disc is at the uppermost end, and the pressure relief pilot valve water inlet pipe and the pressure relief pilot valve pressure sensing pipe are communicated through downward movement.
Further, the pressurizing pilot valve 2 and the pressure releasing pilot valve 3 may be replaced by other pilot valves with similar structures, so long as the action mode is: when the sensing pressure of the pressurizing pilot valve is higher than the action pressure set value, the water inlet pipeline and the water outlet pipeline of the pressurizing pilot valve are communicated, and are disconnected otherwise; when the sensing pressure of the pressure relief pilot valve is lower than the action pressure set value, the water inlet pipeline and the water outlet pipeline of the pressure relief pilot valve are connected, and conversely, the pressure relief pilot valve is disconnected.
Furthermore, the control system can be added with accessories such as a water inlet main valve, a water outlet main valve, a filter and the like according to the requirement; a valve can be added on the connecting pipeline of the main valve control cavity 1a for locking the opening of the main valve.
Example 3:
the control method of the double pilot valve control system for the pressure reducing valve of any water supply system is adopted, and comprises the following steps:
step1: adjusting the top adjusting bolts of the pressurizing pilot valve 2 and the pressure releasing pilot valve 3 to enable the action pressure set value P1 of the pressurizing pilot valve to be larger than the action pressure set value P2 of the pressure releasing pilot valve diaphragm 3 b;
step2: when the pressure of the main valve water outlet pipe 1e of the main valve 1 is larger than P1, the pressure-charging pilot valve intercepting disc 2e moves upwards, so that the pressure-charging pilot valve water inlet pipe 2d is communicated with the pressure-charging pilot valve water outlet pipe 2 g; meanwhile, the pressure relief pilot valve intercepting disc 3d is arranged at the uppermost end, and the pressure relief pilot valve water inlet pipe 3e is disconnected with the pressure relief pilot valve water outlet pipe 3c; at this time, the main valve water inlet pipe 1d fills the main valve control cavity 1a through the pressurizing pilot valve 2, so that the main valve disk 1c moves downwards, and the pressure of the main valve water outlet pipe 1e is reduced until the pressure is smaller than P1;
step3: when the pressure of the main valve water outlet pipe 1e is smaller than P2, the pressure-charging pilot valve intercepting disc 2e is positioned at the lowest end, so that the pressure-charging pilot valve water inlet pipe 2d is disconnected with the pressure-charging pilot valve water outlet pipe 2 g; simultaneously, the pressure relief pilot valve intercepting disc 3d moves downwards, so that the pressure relief pilot valve water inlet pipe 3e is communicated with the pressure relief pilot valve water outlet pipe 3c; at this time, the main valve control chamber 1a will drain water to the main valve outlet pipe 1e through the pressure relief pilot valve 2, so that the main valve disk 1c moves upwards, and the pressure of the main valve outlet pipe 1e increases until it is greater than P2;
step4: the pressure of the main valve water outlet pipe 1e can be stabilized between P1 and P2 through the automatic regulation process of Step 1-Step 3, at the moment, the pressure-charging pilot valve shutoff disc 2e is at the lowest end, and the pressure-charging pilot valve water inlet pipe 2d is disconnected with the pressure-charging pilot valve water outlet pipe 2 g; meanwhile, the pressure relief pilot valve intercepting disc 3d is positioned at the uppermost end, and the pressure relief pilot valve water inlet pipe 3e is disconnected with the pressure relief pilot valve water outlet pipe 3c, so that the main valve control cavity 1a is neither filled with water nor drained, and the opening degree of the main valve disc 1c is kept unchanged;
step5: the opening of the pressurizing pilot valve needle valve 2f and the decompression pilot valve needle valve 3f are regulated, and the water filling and draining speeds of the main valve control cavity 1a can be respectively regulated, so that the reaction speed of the main valve is regulated.
The above-described embodiments are intended to illustrate the present invention, not to limit it, and any modifications and variations made thereto are within the spirit of the invention and the scope of the appended claims.
Claims (2)
1. A double pilot valve control system for a pressure reducing valve of a water supply system is characterized in that: the hydraulic pressure control device comprises a main valve (1), a pressurizing pilot valve (2) and a pressure relief pilot valve (3);
a main valve water inlet pipe (1 d) of the main valve (1) is communicated with a pressure-charging pilot valve water inlet pipe (2 d) of the pressure-charging pilot valve (2) through a communicating pipe, and a main valve water outlet pipe (1 e) of the main valve (1) is simultaneously communicated with a pressure-charging pilot valve pressure sensing pipe (2 c) of the pressure-charging pilot valve (2) and a pressure-discharging pilot valve water outlet pipe (3 c) of the pressure-discharging pilot valve (3) through a communicating pipe;
the pressure-increasing pilot valve water outlet pipe (2 g) of the pressure-increasing pilot valve (2) is simultaneously communicated with the main valve control cavity (1 a) of the main valve (1) and the pressure-decreasing pilot valve water inlet pipe (3 e) of the pressure-decreasing pilot valve (3);
a main valve diaphragm (1 b) is arranged in the middle of a valve rod of the main valve (1), a main valve disc (1 c) is arranged at the tail end of the valve rod, a main valve control cavity (1 a) is formed in an upper cavity of the main valve diaphragm (1 b) of the main valve (1), and the main valve disc (1 c) is arranged between a main valve water inlet pipe (1 d) and a main valve water outlet pipe (1 e);
the pressure-increasing pilot valve (2) comprises a pressure-increasing pilot valve diaphragm (2 b), a pressure-increasing pilot valve spring (2 a) is arranged in the upper cavity of the pressure-increasing pilot valve diaphragm (2 b), an adjusting bolt for adjusting spring force is arranged at the top of the pressure-increasing pilot valve spring (2 a), a pressure-increasing pilot valve intercepting disc (2 e) is arranged on the lower end face of the pressure-increasing pilot valve diaphragm (2 b), and the pressure-increasing pilot valve intercepting disc (2 e) is matched with a pressure-increasing pilot valve water outlet pipe (2 g); a pressure-sensitive tube (2 c) of the pressure-sensitive valve is communicated with the lower cavity of a pressure-sensitive valve diaphragm (2 b) in the pressure-sensitive valve (2); a pressurizing pilot valve needle valve (2 f) is arranged between the cavity where the pressurizing pilot valve water inlet pipe (2 d) and the pressurizing pilot valve shutoff disc (2 e) are positioned;
the pressure relief pilot valve (3) comprises a pressure relief pilot valve diaphragm (3 b), a pressure relief pilot valve spring (3 a) is arranged in an upper cavity of the pressure relief pilot valve diaphragm (3 b), an adjusting bolt for adjusting spring force is arranged at the top of the pressure relief pilot valve spring (3 a), and a pressure relief pilot valve shutoff disc (3 d) is arranged on the lower end face of the pressure relief pilot valve diaphragm (3 b); a pressure relief pilot valve outlet pipe (3 c) is communicated with the lower cavity of a pressure relief pilot valve diaphragm (3 b) inside the pressure relief pilot valve (3); a pressure relief pilot valve needle valve (3 f) is arranged between the cavity where the pressure relief pilot valve water inlet pipe (3 e) and the pressure relief pilot valve closure disc (3 d) are located.
2. The control method using the double pilot valve control system for the pressure reducing valve of the water supply system as set forth in claim 1, characterized in that it includes the steps of:
step1: adjusting top adjusting bolts of the pressurizing pilot valve (2) and the pressure relief pilot valve (3) to enable an action pressure set value P1 of the pressurizing pilot valve to be larger than an action pressure set value P2 of a pressure relief pilot valve diaphragm 3 b;
step2: when the pressure of a main valve water outlet pipe (1 e) of the main valve (1) is larger than P1, a pressurizing pilot valve intercepting disc (2 e) moves upwards, so that a pressurizing pilot valve water inlet pipe (2 d) is communicated with a pressurizing pilot valve water outlet pipe (2 g); meanwhile, the pressure relief pilot valve intercepting disc (3 d) is arranged at the uppermost end, and the pressure relief pilot valve water inlet pipe (3 e) is disconnected with the pressure relief pilot valve water outlet pipe (3 c); at the moment, the main valve water inlet pipe (1 d) fills water into the main valve control cavity (1 a) through the pressurizing pilot valve (2) to enable the main valve disc (1 c) to move downwards, so that the pressure of the main valve water outlet pipe (1 e) is reduced until the pressure is smaller than P1;
step3: when the pressure of the main valve water outlet pipe (1 e) is smaller than P2, the pressure-charging pilot valve shutoff disc (2 e) is positioned at the lowest end, so that the pressure-charging pilot valve water inlet pipe (2 d) is disconnected with the pressure-charging pilot valve water outlet pipe (2 g); simultaneously, the pressure relief pilot valve intercepting disc (3 d) moves downwards, so that the pressure relief pilot valve water inlet pipe (3 e) is communicated with the pressure relief pilot valve water outlet pipe (3 c); at the moment, the main valve control cavity (1 a) drains water to the main valve water outlet pipe (1 e) through the pressure relief pilot valve (2) to enable the main valve disc (1 c) to move upwards, so that the pressure of the main valve water outlet pipe (1 e) is increased until the pressure is larger than P2;
step4: the pressure of the main valve water outlet pipe (1 e) can be stabilized between P1 and P2 through the automatic regulation process of Step 1-Step 3, at the moment, the pressure-charging pilot valve shutoff disc (2 e) is at the lowest end, and the pressure-charging pilot valve water inlet pipe (2 d) is disconnected with the pressure-charging pilot valve water outlet pipe (2 g); meanwhile, the pressure relief pilot valve intercepting disc (3 d) is arranged at the uppermost end, the pressure relief pilot valve water inlet pipe (3 e) is disconnected with the pressure relief pilot valve water outlet pipe (3 c), so that the main valve control cavity (1 a) is neither filled with water nor drained, and the opening degree of the main valve disc (1 c) is kept unchanged;
step5: the opening of the pressurizing pilot valve needle valve (2 f) and the decompression pilot valve needle valve (3 f) are adjusted, and the water filling and draining speeds of the main valve control cavity (1 a) can be respectively adjusted, so that the reaction speed of the main valve is adjusted.
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| CN201710619113.3A CN107246498B (en) | 2017-07-26 | 2017-07-26 | Double pilot valve control system and control method for pressure reducing valve of water supply system |
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| CN201710619113.3A CN107246498B (en) | 2017-07-26 | 2017-07-26 | Double pilot valve control system and control method for pressure reducing valve of water supply system |
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| CN107246498B true CN107246498B (en) | 2023-10-20 |
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| CN108223867A (en) * | 2017-12-27 | 2018-06-29 | 杭州春江阀门有限公司 | A kind of Depressure valve |
| US10788056B2 (en) * | 2018-08-17 | 2020-09-29 | Bermad Cs Ltd. | Pilot valve assembly with orientation adjustment |
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| JPH10272202A (en) * | 1997-03-31 | 1998-10-13 | Nohmi Bosai Ltd | Automatic valve of fire extinguishing equipment |
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| CN101668976A (en) * | 2007-04-13 | 2010-03-10 | Cla-Val公司 | System and method for hydraulically managing fluid pressure downstream from a main valve between set points |
| WO2013042853A1 (en) * | 2011-09-19 | 2013-03-28 | 주식회사 바램 | Flow-linked proportionally-controlled reduction valve system |
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| CN103982686A (en) * | 2012-12-28 | 2014-08-13 | 艾默生过程管理调节技术公司 | Backpressure regulator for easy pump start-up |
| CN204371648U (en) * | 2014-12-31 | 2015-06-03 | 武汉大学 | A kind of multi-functional water hammer stops valve in advance |
| CN106249769A (en) * | 2015-06-03 | 2016-12-21 | 艾默生过程管理调节技术公司 | The control system of adjustable deadband |
| CN105757303A (en) * | 2016-03-29 | 2016-07-13 | 上海康措流体控制有限公司 | Pressure control system for aircraft refueling |
| KR101723508B1 (en) * | 2016-10-13 | 2017-04-05 | 주식회사 바램 | Control valve system for preventing water hammer |
| CN207064790U (en) * | 2017-07-26 | 2018-03-02 | 中国长江电力股份有限公司 | A kind of double guide's valve control systems of water system pressure-reducing valve |
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| CN107246498A (en) | 2017-10-13 |
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