CN211144586U - Four-out-of-two emergency shutdown control loop of steam turbine steam valve - Google Patents
Four-out-of-two emergency shutdown control loop of steam turbine steam valve Download PDFInfo
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- CN211144586U CN211144586U CN201922250927.1U CN201922250927U CN211144586U CN 211144586 U CN211144586 U CN 211144586U CN 201922250927 U CN201922250927 U CN 201922250927U CN 211144586 U CN211144586 U CN 211144586U
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Abstract
The utility model provides a two emergency stop control circuit are got to four of steam turbine steam valve door, include the fast sub-assembly of closing of exporting the fast valve control oil way with hydraulic oil, the fast valve control oil way of closing has the oil return diverter valve on, the fast valve control oil way bypass has the oil return pipe, the fast sub-assembly of closing includes that four redundant control's automation props up hydraulic circuit and a manual hydraulic circuit, every automatic hydraulic circuit of propping up all includes an electromagnetic directional valve and a switching-over valve that surges, manual hydraulic circuit includes a manual switching-over valve, manual switching-over valve connects in the control hydraulic fluid port of oil return diverter valve, every hydraulic directional valve is by the electromagnetic directional valve on another or two automatic hydraulic circuit of propping up provides the control pressure oil, and form the control circuit of control oil return diverter valve switching-over with the electromagnetic directional valve on the same automatic hydraulic circuit of propping up. The utility model discloses can prevent effectively that certain solenoid directional valve malfunction and the steam turbine that causes from shutting down the accident in traditional control circuit, play the emergency shutdown function of redundant control.
Description
Technical Field
The utility model belongs to the technical field of hydraulic control system, especially, relate to a steam turbine steam valve's four get two emergency stop control circuit.
Background
The control of the steam valves of the steam turbine is generally ultimately achieved by a hydraulic control system. Currently, in steam turbines, this task is accomplished by a hydraulic control system known as a speed-switching assembly. The hydraulic oil output by the hydraulic pump station passes through the quick-closing assembly and then provides pressure control oil to the steam quick-closing valve to open the steam quick-closing valve. In order to rapidly close the quick-closing valve when needed or in emergency, a large-diameter two-way cartridge valve communicated with an oil return pipeline is connected by the quick-closing valve control oil path output by the quick-closing assembly to realize rapid oil return. Under the normal operation state, the two-way cartridge valve is in a closed state under the control of pressure oil, and a bypass circuit is closed at the moment. When the engine is stopped in need or emergency, the two-way cartridge valve can be opened only by releasing the pressure of the control oil port of the two-way cartridge valve, and the bypass loop is opened at the moment, so that the control oil liquid of the quick closing valve is quickly reduced to zero, and the purpose of quick stop is realized. In order to ensure that the steam supply of steam can be cut off really, the two parallel two-way cartridge valves are generally arranged to form a redundant system so as to ensure that the two electromagnetic directional valves for controlling the oil pressure of the oil port of the two-way cartridge valves can be controlled, when one two-way cartridge valve breaks down, the quick closing valve can be closed, a steam supply loop is cut off, and the accident that the steam supply loop cannot be stopped is avoided. The redundant system for ensuring the reliable closing of the quick closing valve can eliminate the problem caused by the clamping stagnation fault of the electromagnetic directional valve and can effectively prevent the displacement of the valve core of the electromagnetic directional valve caused by the self-reversing fault such as the reduction of the magnetic force provided by a coil under the action of a return spring; or the position of the valve core is changed when the return spring is broken, etc.) to cause the problem of accidental closing of the valve.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the above-mentioned problem, provide a steam turbine steam valve's two emergency stop control circuit of four receipts.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
a four-out-of-two emergency stop control loop of a steam valve of a steam turbine comprises a quick-closing assembly connected with hydraulic oil input and capable of outputting the hydraulic oil to a quick-closing valve control oil path, wherein the quick-closing valve control oil path is provided with an oil return switching valve, and the quick-closing valve control oil path is bypassed by an oil return switching valve and is provided with an oil return pipe, the quick-closing assembly is characterized by comprising four redundantly controlled automatic branch hydraulic loops and a manual branch hydraulic loop connected with the automatic branch hydraulic loop in parallel, each automatic branch hydraulic loop comprises an electromagnetic directional valve and a hydraulic directional valve, the manual hydraulic loop comprises a manual directional valve, the manual directional valve is connected with a control oil port of the oil return switching valve to provide pressure oil for the oil return switching valve, and each hydraulic directional valve is provided with control pressure oil by the electromagnetic directional valve on the other or two automatic branch hydraulic loops, and the control loop and the electromagnetic reversing valve on the same automatic branch hydraulic loop form a control loop for controlling the reversing of the oil return switching valve.
In the emergency stop control loop of the steam valve of the steam turbine, the control oil port of the hydraulic reversing valve is connected to the oil output port of the electromagnetic reversing valve on the other automatic branch hydraulic loop so as to provide control pressure oil by the electromagnetic reversing valve on the other automatic branch hydraulic loop.
In the emergency stop control loop for the steam valve of the steam turbine, the four automatic hydraulic circuits comprise a branch circuit A, a branch circuit B, a branch circuit C and a branch circuit D, wherein the branch circuit A comprises a first electromagnetic directional valve and a first hydraulic directional valve of which a control oil port is connected to a fourth electromagnetic directional valve, and the branch circuit B comprises a second electromagnetic directional valve and a second hydraulic directional valve of which a control oil port is connected to the first electromagnetic directional valve; the branch C comprises a third electromagnetic reversing valve and a third hydraulic reversing valve of which the control oil port is connected with the second electromagnetic reversing valve; and the branch circuit D comprises a fourth electromagnetic reversing valve and a fourth hydraulic reversing valve of which the control oil port is connected with the third electromagnetic reversing valve.
In the emergency stop control loop of the steam valve of the steam turbine with two out of four parts, the third hydraulic reversing valve and the fourth hydraulic reversing valve are supplied with control pressure oil by the electromagnetic reversing valves on the other two automatic branch hydraulic loops.
In the emergency stop control loop for the steam valve of the steam turbine with two out of four, the control oil port of the third hydraulic reversing valve is also connected to the twelfth hydraulic reversing valve, and the control oil port of the twelfth hydraulic reversing valve is connected to the first electromagnetic reversing valve.
In the emergency stop control loop for the steam valve of the steam turbine with two-out-of-four operation, the control oil port of the fourth hydraulic directional control valve is further connected to the twenty-second hydraulic directional control valve, and the control oil port of the twenty-second hydraulic directional control valve is connected to the second electromagnetic directional control valve.
In the emergency stop control loop of the steam valve of the steam turbine with two out of four parts, the oil return switching valve comprises two-way cartridge valves which are connected in parallel.
In the emergency stop control circuit of the steam valve of the steam turbine with two out of four, the oil inlet pipes of the four automatic branch hydraulic circuits are respectively provided with at least one throttle valve.
In the two-out-of-four emergency stop control circuit of the steam valve of the steam turbine, the four automatic branch hydraulic circuits are respectively provided with an installation interface for installing a detection instrument.
In the emergency stop control loop of the steam valve of the steam turbine, the detection instrument is any one or combination of a pressure gauge, a pressure sensor and a pressure acoustic signal instrument.
The utility model has the advantages that: the system can effectively prevent the shutdown accident of the steam turbine caused by the misoperation of a certain electromagnetic directional valve in the traditional control loop, and has the function of redundant control emergency shutdown; even if any one of the electromagnetic valves is damaged, the emergency stop can be carried out, and the probability that the two electromagnetic valves simultaneously have faults is almost zero, so that the possibility that the electromagnetic directional valves cannot be stopped emergently due to the problems of the electromagnetic directional valves can be basically avoided; compared with a two-out-of-three emergency shutdown control loop, the two-out-of-four scheme has higher reliability; in addition, the four automatic branch hydraulic circuits are combined pairwise at will, six conditions are provided, compared with a two-out-of-four mode in the prior art, the control combination is increased by 50%, therefore, the utilization efficiency of the electromagnetic valve of the emergency shutdown circuit is improved by 50%, and the 'failure rate' of the device is greatly reduced.
Drawings
FIG. 1 is a system diagram of the normal operation state of the emergency stop control loop of the utility model with two out of four times;
FIG. 2 is a schematic diagram of a system for reversing a solenoid directional valve of the emergency stop control loop of the utility model;
FIG. 3 is a schematic diagram of a system for reversing two electromagnetic directional valves of the emergency stop control loop according to the present invention;
FIG. 4 is a schematic diagram of a system for reversing three electromagnetic directional valves of the emergency stop control loop according to the present invention;
fig. 5 is a schematic diagram of the system for reversing four electromagnetic directional valves of the emergency stop control loop of the utility model.
Reference numerals: electromagnetic directional valves 11, 21, 31, 41; hydraulically operated directional valves 12, 22, 13, 23, 33, 43; two- way cartridge valves 61, 62; a manual reversing valve 5; a quick-closing valve control oil circuit 7; an oil return pipe 8; hydraulic oil input 9.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment discloses a two-out-of-four emergency shutdown control loop of a steam valve of a steam turbine, which comprises a quick-closing assembly connected to a hydraulic oil input 9 and outputting the hydraulic oil to a quick-closing valve control oil path 7, wherein the hydraulic oil output by a hydraulic pump station is input to the hydraulic oil input 9, the quick-closing valve control oil path 7 is provided with an oil return switching valve, and the quick-closing valve control oil path 7 bypasses an oil return pipe 8 through the oil return switching valve. The oil return switching valve here includes two- way cartridge valves 61 and 62 connected in parallel with each other. The quick-closing assembly comprises a manual loop and an automatic loop which is connected with the manual loop in parallel, the automatic loop is closed, the two- way cartridge valves 61 and 62 are closed, and the quick-closing valve control oil circuit 7 can normally provide required opening pressure for the quick-closing valve and maintain the quick-closing valve in an opening state; when the automatic circuit is opened, the two- way cartridge valves 61 and 62 are opened, the quick-closing valve control oil path 7 is communicated with the oil return pipe 8, the oil pressure on the quick-closing valve control oil path 7 is zero, pressure oil for maintaining the opening of the quick-closing valve cannot be provided, and the quick-closing valve is closed.
Specifically, the automatic circuit of the present embodiment is four redundantly controlled automatic branch hydraulic circuits, the manual circuit is a manual branch hydraulic circuit connected in parallel with the automatic branch hydraulic circuit, each automatic branch hydraulic circuit includes one electromagnetic directional valve 11, 21, 31, 41 and one hydraulic directional valve 13, 23, 33, 43, the manual hydraulic circuit includes one manual directional valve 5, the manual directional valve 5 is connected to the control oil port of the two- way cartridge valve 61, 62 to provide pressure oil for the two- way cartridge valve 61, 62, the hydraulic directional valves 13, 23, 33, 43 in the four automatic branch hydraulic circuits respectively form a control circuit for controlling the two- way cartridge valves 61, 62 to change direction with the electromagnetic directional valve on the same automatic branch hydraulic circuit, and the electromagnetic directional valve on the other or two automatic branch hydraulic circuits provides control pressure oil. And each control loop is communicated with the oil return pipe 8 when being closed. When any control loop is communicated, the pressure of the control oil ports at the two- way cartridge valves 61 and 62 is zero, the two- way cartridge valves 61 and 62 are opened, the bypass of the oil path 7 is controlled by the quick closing valve to be communicated, pressure relief occurs, the quick closing valve is closed, and the steam turbine is stopped.
Specifically, the four automatic hydraulic circuits include a branch a, a branch B, a branch C and a branch D, the branch a includes a first electromagnetic directional valve 11 and a first hydraulic directional valve 13 whose control oil port is connected to the fourth electromagnetic directional valve 41, the branch B includes a second electromagnetic directional valve 21 and a second hydraulic directional valve 23 whose control oil port is connected to the first electromagnetic directional valve 11; the branch C comprises a third electromagnetic directional valve 31 and a third hydraulic directional valve 33 with a control oil port connected with the second electromagnetic directional valve 21; the branch D includes a fourth electromagnetic directional valve 41 and a fourth hydraulic directional valve 43 whose control port is connected to the third electromagnetic directional valve 31.
Further, a control oil port of the third hydraulic reversing valve 33 is also connected to the twelfth hydraulic reversing valve 12, and a control oil port of the twelfth hydraulic reversing valve 12 is connected to the first electromagnetic reversing valve 11; the control oil port of the fourth hydraulic reversing valve 43 is also connected to the twelfth hydraulic reversing valve 22, and the control oil port of the twentieth hydraulic reversing valve 22 is connected to the second electromagnetic reversing valve 21.
The control pressure oil of the first hydraulic reversing valve 13 is provided by the fourth electromagnetic reversing valve 41, the control pressure oil of the second hydraulic reversing valve 23 is provided by the first electromagnetic reversing valve 11, the control pressure oil of the third hydraulic reversing valve 33 is provided by the first electromagnetic reversing valve 11 through the twelfth hydraulic reversing valve 12 or the second electromagnetic reversing valve 21, and the control pressure oil of the fourth hydraulic reversing valve 43 is provided by the second electromagnetic reversing valve 21 through the twelfth hydraulic reversing valve 22 or the third electromagnetic reversing valve 31.
The various states are described in detail below with reference to the attached drawing figures:
as shown in fig. 1, in a normal operation state, at this time, under the action of the electromagnetic directional valves 11, 21, 31, 41 on the four branches, the hydraulic directional valves 12, 22, 13, 23, 33, 43 are in a cut-off state, and the branch of the manual directional valve 5 is in a cut-on state, pressure oil at the control ports of the two- way cartridges 61, 62 is provided by the manual directional valve 5, so that the two- way cartridges 61, 62 are ensured to be in a closed state, the bypass of the quick-closing valve control oil path 7 is cut off, and the quick-closing valve control oil is not released. If the engine needs to be stopped, at least two electromagnetic directional valves in the four electromagnetic directional valves 11, 21, 31 and 41 are simultaneously switched, namely the pressure oil of the control oil ports of the two- way cartridge valves 61 and 62 can be discharged, the two- way cartridge valves 61 and 62 are disconnected, a bypass of the quick-closing valve control oil path 7 is opened, the quick-closing valve control oil is decompressed, and the quick-closing valve is quickly closed, so that the aim of stopping the engine is fulfilled. If only one of the four electromagnetic directional valves is changed, the oil pressure of the control oil ports of the two- way cartridge valves 61 and 62 cannot be discharged, the two- way cartridge valves 61 and 62 cannot be disconnected, and the bypass of the quick-closing valve control oil path 7 is opened to discharge the oil. Therefore, when any one of the four electromagnetic directional valves in the remote control branch circuit generates false action and self-direction change, no shutdown accident can be caused, and the electromagnetic directional valve is effectively prevented from self-direction change and generating unexpected shutdown accidents.
The utility model discloses an among the hydraulic control return circuit, only when two solenoid directional valves in four malfunction simultaneously, just can produce and can not shut down the accident. The probability of two of the four elements failing simultaneously is almost zero, so that the possibility of an emergency stop due to a problem with the electromagnetic directional valve is substantially eliminated.
In addition, the four automatic branch hydraulic circuits of the embodiment are all provided with the mounting interfaces for mounting the detection instrument, so that the detection instrument for detecting the fault of the electromagnetic directional valve can be arranged, the detection instrument can be any one or combination of a pressure gauge, a pressure sensor and a pressure acoustic signal instrument, the electromagnetic directional valve with the self-reversing fault can be effectively found through the instruments and replaced in time, and the occurrence of accidents is completely avoided. The following describes the system loop when the four electromagnetic directional valves are in different states.
When the oil pressure of the system is unloaded, the condition that the quick closing valve is closed is as follows: the two half oil paths controlled by the electromagnetic change-over valve X1 and the hydraulic change-over valve X3 can form a closed oil path (X is 1,2,3,4)
1. A situation of a magnetic exchange valve (figure 2)
Assuming that the electromagnetic directional valve 11 is reversed and no pressure oil is output from the oil port B, the hydraulic directional valves 12, 23 and 33 controlled by the electromagnetic directional valve control the oil port to input no pressure oil and reverse under the action of the return spring. The oil flow conditions with the four branches at this time are: the branch A is communicated with a half branch controlled by a first electromagnetic valve 11, and is disconnected by a half branch controlled by a first hydraulic reversing valve 13; the branch B is disconnected by a half branch controlled by a second electromagnetic directional valve 21, and is communicated by a half branch controlled by a second hydraulic directional valve 23; the branch C is disconnected by a half branch controlled by the third electromagnetic directional valve 31, the branch C is connected by a half branch controlled by the third hydraulic directional valve 33, the branch D is disconnected by a half branch controlled by the fourth electromagnetic directional valve 41, and the branch D is disconnected by a half branch controlled by the fourth hydraulic directional valve 43. All control loops are closed at this time. Meanwhile, the branch E is communicated with the pressure oil input, the two- way cartridge valves 61 and 62 are kept in a closed state under the action of the pressure oil of the manual reversing valve 5, the quick closing valve controls the bypass of the oil path to be closed, pressure relief is not generated, and the quick closing valve is kept in an open state.
The situation is when the first branch electromagnetic valve is reversed, and is similar to the situation of the second remote control branch; the third and fourth branches are simpler.
2. The situation that two electromagnetic directional valves change direction simultaneously (figure 3)
Assuming that the first electromagnetic directional valve 11 and the second electromagnetic directional valve 21 are switched without pressure oil output, the corresponding hydraulically operated directional valves 12, 22, 23, 33, 34 are switched under the action of the return springs. The oil flow conditions of the four branches are as follows: the branch A is communicated with a half branch controlled by a first electromagnetic valve 11, and is disconnected by a half branch controlled by a first hydraulic reversing valve 13; the branch B is a half-branch passage controlled by a second electromagnetic directional valve 21, and a half-branch passage controlled by a second hydraulic directional valve 23; the branch C is disconnected by a half branch controlled by the third electromagnetic directional valve 31, the branch C is connected by a half branch controlled by the third hydraulic directional valve 33, the branch D is disconnected by a half branch controlled by the fourth electromagnetic directional valve 41, and the branch D is disconnected by a half branch controlled by the fourth hydraulic directional valve 43. All control loops are closed at this time. In addition, the fifth branch E communicates with the pressure oil inlet. At this time, the control circuit of the branch B is closed and communicated with the oil return pipe 8, so the two- way cartridge valves 61 and 61 control the pressure of the oil port to be zero, the two- way cartridge valves 61 and 61 are opened, the bypass of the quick closing valve control oil path 7 is communicated to generate pressure relief, the quick closing valve is closed, and the steam turbine is stopped.
In addition, the oil inlet pipes of the four branches are respectively provided with at least one throttle valve J1, J2, J3, J4 and J5. Because the oil inlet pipeline of each branch is provided with the throttle valve, the input of pressure oil is slightly reduced under the throttling action of the throttle valve, but accidents caused by pressure loss of the whole quick-closing assembly cannot occur.
This is the case when the electromagnetic directional valves 11, 12 are switched, and the case where the remaining electromagnetic directional valves are combined is similar.
3. The situation that three electromagnetic directional valves change direction simultaneously (figure 4)
Assuming that the electromagnetic directional valves 11, 21 and 31 are switched without the output of pressure oil, the corresponding hydraulically operated directional valves 12, 22, 23, 33, 43 are switched by the return springs. The oil flow conditions of the four branches are as follows: the branch A is communicated with a half branch controlled by a first electromagnetic valve 11, and is disconnected by a half branch controlled by a first hydraulic reversing valve 13; the branch B is a half-branch passage controlled by a second electromagnetic directional valve 21, and a half-branch passage controlled by a second hydraulic directional valve 23; the branch C is a half-branch circuit controlled by a third electromagnetic reversing valve 31 and a half-branch circuit controlled by a third hydraulic reversing valve 33; the branch D is disconnected by a half branch controlled by the fourth electromagnetic directional valve 41, the branch E is disconnected by a half branch controlled by the fourth hydraulic directional valve 43, and the branch E is communicated with the pressure oil input. At this time, the branch B and the branch C are communicated with the oil return pipe 8, so the pressure of the oil ports 61 and 62 is controlled to be zero by the two-way cartridge valve, the two- way cartridge valves 61 and 62 are opened, the bypass of the oil path 7 is controlled to be communicated by the quick closing valve, pressure relief occurs, the quick closing valve is closed, and the steam turbine is stopped.
This is the case when the electromagnetic directional valves 11, 21, 31 are switched, and the case of the other electromagnetic directional valves in combination is similar.
4. Situation of four electromagnetic directional valves simultaneously changing direction fig. 5
Under the condition, all the electromagnetic reversing valves are reversed, the hydraulic reversing valve controlled by the electromagnetic reversing valves is also reversed under the action of a return spring, four branches are communicated with the oil return pipe 8, only the branch E is communicated with the pressure oil input, at the moment, the two-way cartridge valve controls the oil ports 61 and 62 to be communicated with the oil return pipe 8, the oil ports are opened, the bypass of the oil path 7 is controlled by the quick closing valve to be opened to release pressure, the quick closing valve is closed, and the steam turbine is stopped.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or scope of the invention as defined in the appended claims, the invention being directed to direct or indirect connection.
Although the electromagnetic directional valves 11, 21, 31, 41 are used more herein; hydraulically operated directional valves 12, 22, 32, 42; two- way cartridge valves 61, 62; a manual reversing valve 5; a quick-closing valve control oil circuit 7; an oil return pipe 8; hydraulic oil input 9, etc., without excluding the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. A four-out-of-two emergency stop control loop of a steam valve of a steam turbine comprises a quick-closing assembly connected with hydraulic oil input and capable of outputting the hydraulic oil to a quick-closing valve control oil path, wherein the quick-closing valve control oil path is provided with an oil return switching valve, and the quick-closing valve control oil path is bypassed by an oil return switching valve and is provided with an oil return pipe, the quick-closing assembly is characterized by comprising four redundantly controlled automatic branch hydraulic loops and a manual branch hydraulic loop connected with the automatic branch hydraulic loop in parallel, each automatic branch hydraulic loop comprises an electromagnetic directional valve and a hydraulic directional valve, the manual hydraulic loop comprises a manual directional valve, the manual directional valve is connected with a control oil port of the oil return switching valve to provide pressure oil for the oil return switching valve, and each hydraulic directional valve is provided with control pressure oil by the electromagnetic directional valve on the other or two automatic branch hydraulic loops, and the control loop and the electromagnetic reversing valve on the same automatic branch hydraulic loop form a control loop for controlling the reversing of the oil return switching valve.
2. The two-out-of-four emergency shutdown control circuit of steam valve of steam turbine according to claim 1, wherein the control oil port of the hydraulic change-over valve is connected to the oil output port of the electromagnetic change-over valve on the other hydraulic circuit of the automatic branch to provide control pressure oil from the electromagnetic change-over valve on the other hydraulic circuit of the automatic branch.
3. The emergency stop control circuit of the steam valve of the steam turbine according to claim 2, wherein the four automatic hydraulic circuits comprise a branch a, a branch B, a branch C and a branch D, the branch a comprises a first electromagnetic directional valve (11) and a first hydraulic directional valve (13) with a control oil port connected to a fourth electromagnetic directional valve (41), the branch B comprises a second electromagnetic directional valve (21) and a second hydraulic directional valve (23) with a control oil port connected to the first electromagnetic directional valve (11); the branch C comprises a third electromagnetic directional valve (31) and a third hydraulic directional valve (33) with a control oil port connected with the second electromagnetic directional valve (21); the branch circuit D comprises a fourth electromagnetic directional valve (41) and a fourth hydraulic directional valve (43) with a control oil port connected with the third electromagnetic directional valve (31).
4. The emergency stop control circuit of steam turbine steam valve according to claim 3, wherein the third hydraulic directional control valve (33) and the fourth hydraulic directional control valve (43) are supplied with control pressure oil by the electromagnetic directional control valves of the other two automatic branch hydraulic circuits.
5. The two-out-of-four emergency shutdown control circuit of the steam valve of the steam turbine according to claim 4, characterized in that the control oil port of the third hydraulic directional control valve (33) is further connected to a twelfth hydraulic directional control valve (12), and the control oil port of the twelfth hydraulic directional control valve (12) is connected to the first electromagnetic directional control valve (11).
6. The two-out-of-four emergency shutdown control circuit of the steam valve of the steam turbine according to claim 5, characterized in that the control oil port of the fourth hydraulic directional valve (43) is further connected to a twelfth hydraulic directional valve (22), and the control oil port of the twelfth hydraulic directional valve (22) is connected to the second electromagnetic directional valve (21).
7. The two-out-of-four emergency shutdown control circuit of steam turbine steam valves of any one of claims 1 to 6, wherein the return switching valve comprises two-way cartridge valves connected in parallel with each other.
8. The two-out-of-four emergency shutdown control circuit for steam turbine steam valves of claim 7, wherein the four hydraulic circuits of the automatic branch are each provided with at least one throttle valve on the oil inlet pipe.
9. The two-out-of-four emergency shutdown control circuit of a steam turbine steam valve according to claim 8, wherein each of the four automatic branch hydraulic circuits has a mounting interface for mounting a instrumentation.
10. The two-out-of-four emergency shutdown control loop of a steam turbine steam valve according to claim 9, wherein the instrumentation is any one or a combination of a pressure gauge, a pressure sensor and a pressure acoustic signal instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922250927.1U CN211144586U (en) | 2019-12-16 | 2019-12-16 | Four-out-of-two emergency shutdown control loop of steam turbine steam valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922250927.1U CN211144586U (en) | 2019-12-16 | 2019-12-16 | Four-out-of-two emergency shutdown control loop of steam turbine steam valve |
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| Publication Number | Publication Date |
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| CN211144586U true CN211144586U (en) | 2020-07-31 |
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| CN201922250927.1U Active CN211144586U (en) | 2019-12-16 | 2019-12-16 | Four-out-of-two emergency shutdown control loop of steam turbine steam valve |
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| CN (1) | CN211144586U (en) |
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