JPS63134896A - Controller for outlet valve for water feeding pump - Google Patents

Abstract

PURPOSE:To prevent the pressure increase by locking the number of revolution of a water feeding pump, when the outlet valve of a water feeding pump is not perfectly opened, independently of the signal for the perfect opening. CONSTITUTION:When the supplied water pressure at the outlet of a water feeding pump becomes over a prescribed set value, a signal is input into an outlet valve 6, and the outlet valve 6 is opened perfectly. When the outlet valve 6 is not perfectly opened independently of the signal, a signal is input into an AND circuit 25, and the number of revolution of the water feeding pump is maintained at the present state by a water feeding pump revolution speed increasing lock 36, and an alarm signal is outputted. Therefore, the increase of the supplied water pressure in a water feeding pipe at the outlet of the water feeding pump over the max. designed pressure can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a water supply pump outlet valve control device that has a function of protecting a water supply pump outlet water supply pipe in a thermal power plant or the like.

(Prior art) Recently, thermal power plants have become more and more popular as nuclear power plants have started to be operated on a base load basis.
In order to respond to changes in power demand and supply, shorten plant start-up time, or improve efficiency in the partial load range, variable pressure operation methods are often adopted that change the main steam pressure according to the operating load.

In thermal power plants using variable pressure operation, a water pump outlet water control valve is generally installed in the outlet water pipe of the turbine-driven water pump, which is used only during plant start-up and low load times.

This is because the boiler is often in an unpressurized state when the plant starts up, and the required flow rate of water supply at the time of boiler ignition is small (
The minimum flow of a boiler is usually 2 of its MCR evaporation rate.
However, due to its characteristics, water supply pumps have a high gain in the low flow range, and even a slight change in the rotational speed of the driving turbine can cause large fluctuations in the water supply flow rate. This is to improve water supply controllability in low flow areas by providing a pump outlet water supply control valve, maintaining the water supply pump at a constant rotation speed, and controlling the opening of the water supply pump outlet water supply control valve to adjust the water supply flow rate. . In this case, when the load reaches a high-load region, the main steam pressure also rises, and the differential pressure across the front and back increases due to throttling control of the water supply control valve at the outlet of the water supply pump.Therefore, there are problems with the valve's pressure resistance and the generation of two lotions, which cannot be addressed technically. Due to this difficulty, the water supply pump outlet water control valve is not used in high load areas, and the water supply flow rate is adjusted by controlling the rotation speed of the water supply pump driving turbine.

FIG. 3 shows a schematic configuration of a water supply flow rate control device in a plant having a water supply pump outlet water control valve whose use is limited to the time of plant start-up and low load as described above. A check valve 3, a water pump outlet water supply control valve 4, and a rear valve 5 are inserted in the water supply pump outlet water supply pipe 2 leading from the water supply pump outlet to the boiler. A water supply pump outlet valve 6 is connected by bypassing the water supply pump outlet water supply adjustment valve rear valve 5 .

Water supply pump outlet water supply control valve 4 of water supply pump outlet water supply pipe 2
A water pump overheating prevention valve 8 and a water pump overheating prevention valve switching valve 9 are inserted in the middle of the water pump overheating prevention pipe 7 that branches from the upstream side and reaches the deaerator. Further, a water pump suction flow rate transmitter 11 is inserted into a water pump suction water pipe 10 connected to the suction side of the water pump 1 .

In addition, the maximum operating design pressure of the water supply pipe 2 from the water supply pump 1 to the water supply pump outlet water supply control valve rear valve 5 is the same as that from the water supply pump 1 to the water supply pump outlet water supply control valve 4, and the water supply pump outlet water supply pipe 2. A pressure equal to the maximum working design pressure from the water supply control valve 4 to the stop valve closest to the boiler is used.

The above-mentioned water supply pump suction flow rate transmitter 11 and the water supply pump 1
Signals from the water supply pump rotation speed transmitter 12 attached to the water supply pump outlet water supply control valve 4 and the signals from the water supply pump outlet water supply control valve opening degree transmitter 13 attached to the water supply pump outlet water supply control valve 4 are input to the water supply flow rate control device 14, The water supply pump outlet pressure signal 15a from the water supply pump outlet pressure transmitter 15, which detects the discharge side pressure of the water supply pump, is used for outputting an alarm exceeding a specified value and for a pressure indicator.

On the other hand, the water supply flow rate command 16 is calculated in the water supply command calculation unit 17 of the water supply flow rate control device 14, and the obtained water supply pump rotation speed/water supply control valve opening degree command 17a is sent to the water supply pump 1 and the water supply pump outlet water control valve 4. is input.

The signal 18a from the AND circuit 18 with the AND condition of the water supply pump set rotation speed (a) and the water supply pump outlet water supply control valve setting opening degree (b) is led to the water supply pump outlet valve 6, and
The water supply pump outlet water supply regulating valve rear valve opening/closing command 14a from the water supply flow rate control device 14 is the water supply pump outlet water supply regulating valve release valve 5.
is man-powered.

Next, the operation of the conventional water supply pump outlet valve control device constructed as described above will be explained with reference to FIGS. 3 and 4.

First, the water supply pump drive turbine (not shown) directly connected to the water supply pump 1 is reset, the water supply pump outlet water supply control valve release valve 5 is fully opened, and the water supply pump drive turbine is gradually increased in speed to the minimum operating speed. The rotational speed is kept constant at several MINR. The opening operation of the water supply pump outlet water supply control valve release valve is performed by the water supply pump outlet water supply control valve rear valve opening/closing command 14a from the water supply flow rate control device 14. In addition, the speed increase and rotation speed maintenance of the water supply pump 1 is controlled by the rotation speed command in the water supply pump rotation speed/water supply control valve opening degree command 17a output from the water supply flow rate control device 14 (
What is actually controlled is the water supply pump driving turbine, but since this and the water supply pump 1 are directly connected, the water supply pump will be used as a representative in the following explanation). During this time, the water supply pump 1 performs minimum flow operation, and the water supply is sent to the deaerator via the water supply pump overheat prevention valve 8 and the water supply pump overheat prevention valve release valve 9.

After time A in FIG. 4, when the water supply flow rate command 16 increases in accordance with the increase in load, the water supply pump outlet water supply water regulation valve 4 gradually opens as the water supply pump rotation speed/water supply regulating valve opening command 17a increases. Although the water supply is increased by increasing the number of rotations, the water supply pump 1 is maintained at the minimum operating rotation speed MINR.

The water supply flow rate command 16 further increases, and the minimum operating rotation speed MIN
When the required water supply cannot be obtained by simply increasing the opening of the water supply pump outlet water supply control valve 4 while R is maintained (time B)
, the rotation speed of the water supply pump 1 is increased, and when it exceeds the water supply pump setting rotation speed (Yrpm), the water supply pump outlet valve 6 is increased.
fully open. The subsequent increase in the water supply flow rate in the high load range is responded to by increasing the rotational speed of the water supply pump 1.

The above-mentioned series of operations is performed by the water supply pump outlet water supply regulating valve rear valve opening/closing command 14a1 which is output from the water supply flow rate control device 14, the water supply pump rotation speed/water supply regulating valve opening command 17a1, the rotation speed control switching/water supply pump outlet valve opening/closing signal 18a However, in addition to the water supply flow rate command 16, the water supply pump suction flow rate signal 11a from the water supply pump suction flow rate transmitter 11, and the water supply pump rotation speed from the water supply pump rotation speed transmitter 12 are used as determining factors for the control. Signal 12a1 Water supply pump outlet water supply control valve opening degree from water supply pump outlet water supply control valve opening degree transmitter 13 (along with No. i 13.a, full open/full open signal of water supply pump outlet water control valve release valve 5 and water supply pump outlet valve 6) etc. are used.

In addition, when switching from water supply control based on the opening degree of the water supply pump outlet water supply control valve 4 to water supply control based on the rotation speed of the water supply pump 1, the interlock to fully open the water supply pump outlet valve 6 is determined by the rotation of the water supply pump. The number signal 12a and the water supply pump outlet water supply control valve opening signal 13a are water supply pump rotation speed signal ≧ water supply pump set rotation speed (Yrpm)... (1) Water supply pump output water supply control valve opening signal ≧ water supply pump outlet water supply Control valve setting opening (2%)...(
2) is performed by the AND circuit 18 with the following as the AND condition.

The operation when the water supply flow rate decreases or stops is as follows.

That is, when the water supply flow rate command 16 to reduce the water supply flow rate is input, the water supply pump 1 gradually reduces the rotation speed according to the water supply pump rotation speed/water supply control valve opening command 17a, and the water supply flow rate is adjusted to the water supply pump 1. When the flow rate becomes lower than the fully open flow rate of the outlet water supply control valve 4 (time D), the water supply pump outlet water supply control valve 4 begins to close. Thereafter, the water supply flow rate is decreased by decreasing the rotation speed of the water supply pump 1 and the opening degree of the water supply pump outlet water supply control valve 4, but the water supply pump rotation speed signal 12a and the water supply pump outlet water supply control valve opening degree Signal 13a is the water supply pump rotation speed signal ≦ water supply pump set rotation speed (Y'rpm)... (3) Water supply pump output water supply control valve opening degree signal ≦ water supply pump outlet water supply control valve setting degree of opening (Z' %) ...(4) AN
When condition D is satisfied, the water supply pump outlet valve 6 is fully opened.

When the water supply flow rate further decreases, the opening degree of the water supply pump outlet water supply control valve 4 gradually decreases, and the rotation speed of the water supply pump 1 also decreases, so that the minimum operating rotation speed MINR is maintained. After that, if the water supply pump is stopped at time F, the water supply pump rotation speed signal 12H from the water supply pump rotation speed transmitter 12 is transmitted.
The water supply flow rate control device 14 outputs the water supply pump rotation speed/water supply control valve opening degree command 17a and the water supply pump outlet water supply control valve rear valve opening/closing command 14a, and the water supply pump outlet water supply control valve 4 and the water supply pump outlet water supply control valve rear are output. Case 5 is fully opened due to interlock.

As mentioned above, in the water supply pump outlet valve control device of FIG. 3, the water supply flow rate control (hereinafter referred to as
This is called control valve control. ) is performed, and at time B-E, rotation/rotation speed control (hereinafter referred to as rotation speed control) of the water supply pump is performed.

) is carried out.

Therefore, between times B and C and between times D and E, the control valve control and the rotation speed control are performed in an overlapping manner.

Figure 5 shows the operation of the water supply pump outlet valve control device described above.
It is expressed on the water pump Q-H characteristic curve when one water pump is in operation and when two water pumps are in operation in a variable pressure operation plant.

In the figure, the first water supply pump is started and its rotation speed is set to the minimum operating rotation speed MINH.

At point a on the minimum operating rotational speed MINR, the water supply pump 1 is operating at the minimum flow, and in response to the command to increase the water supply flow rate, the rotational speed of the water supply pump 1 is changed to the minimum operating rotational speed M.
The water supply flow rate is increased by increasing the opening degree of the water supply pump outlet water supply control valve 4 while maintaining the water supply pump at INH. In this case, the operating point shifts from a to b on the minimum operating rotational speed MINR curve.

When a command to increase the water supply flow rate is further input at the operating point S, the opening degree of the water supply pump outlet water supply control valve 4 is increased and the rotation speed of the water supply pump 1 is also increased to increase the water supply flow rate, but the system resistance curve SL and the intersection of the water supply pump rotation speed (0
Above point), that is, above the fully open point of the water supply pump outlet water supply control valve 4, the rotation speed is controlled only by the water supply pump 1.

When the water supply flow rate increases after the 0 point, it moves to the point of intersection with the water supply pump rotation speed along the system resistance curve SL, but the allowable maximum flow ffiMA when one water pump is operated
When performing operations where an increase in water supply flow rate (i.e. load increase) is expected at or above the intersection point 02 between XFL and system resistance curves S and L, a second water supply pump is additionally started before the water supply flow rate reaches intersection point QZ. let The maximum usage of the water supply pump outlet water supply pipe 2 from the water supply pump 1 to the water supply pump outlet water supply control valve consequent 5 is determined by adding a predetermined margin to the maximum value of the water supply pump outlet pressure expected when two water supply pumps are operated. The design pressure MAXP is determined. In this case, the operating point is the system resistance curve SL and the water supply pump rotation speed MAXP -1 at the maximum operating design pressure point? The intersection point with PMAX is PMAX.

FIG. 6 shows an interlock diagram illustrating the operating method of the conventional water supply pump outlet valve control device described above. When switching from control valve control by the water supply pump outlet water supply control valve 4 to rotation speed control by the water supply pump 1, the interlock that opens the water supply pump/outlet valve 6 is an AND condition of equations (1) and (2). When satisfied, a full open signal is given to the water supply pump outlet valve 6 via the AND circuit 18 and the OR circuit 20. On the other hand, the interlock that closes the water supply pump outlet valve 6 when switching from the rotation speed control by the water supply pump to the control valve control by the water supply pump outlet water supply control valve 4 as the load decreases is determined by formula (3) and ( 4) If the AND condition of formula is satisfied, A
A full open signal is given to the water supply pump outlet valve 6 via the ND circuit 18 and the OR circuit 20.

In addition, during normal operation, the outlet pressure of the water supply pump 1 becomes abnormally high, and the highest used membrane of the water supply pump outlet water supply pipe 2 is set to a predetermined level below the pressure. When the limit is exceeded, a warning ANN will be generated.
Consideration has been given to having operators take steps such as emergency trips of water pumps.

(Problems to be Solved by the Invention) In the conventional device described above, in the process of additionally starting the second water supply pump to increase the water supply flow rate, the water supply control by this water supply pump is controlled by the water supply pump outlet water supply control valve. When switching from control valve 4 to rotation speed control using only the water pump rotation speed, for some reason the water pump outlet water control valve 4 is fully closed and the water pump outlet valve 6 is closed. When a situation occurs in which the water supply pump 1 does not open, that is, when the water supply pump 1 is temporarily in a closed operation state, the water supply flow rate command to the water supply pump goes out of control in the increasing direction, the rotation speed of the water supply pump increases, and its outlet pressure increases. becomes abnormally high, and eventually exceeds the maximum operating design pressure PMAX mentioned above.

Although such situations do not occur frequently, for example,
If an abnormality occurs in the water supply command calculating section of the water supply flow rate control device or a diode failure in the water supply flow rate control device that issues the water supply flow rate command, an abnormality occurs such as the water supply flow rate increase command being output continuously. , the outlet pressure of the water pump may exceed the above-mentioned P, leading to destruction of the water pump outlet water pipe.

Conventional equipment also predicts the occurrence of such a situation and issues an alarm at the high pressure alarm point PANN at the water supply pump outlet to notify the operator of the abnormality, but due to a delay in the operator's response, the water supply pump has to be stopped immediately. If these measures were not taken in time, the rotational speed of the water supply pump would greatly exceed the alarm point PANN, potentially damaging the water supply pipe at the water pump's outlet.

(Objective of the Invention) The present invention has been made to eliminate the above-mentioned drawbacks in the background art. When the water supply pump becomes fully closed due to the above reasons, or when the outlet pressure of the water supply pump rises abnormally and exceeds the preset pressure, the water supply pump can be operated in its closed state by immediately fully opening the water supply pump outlet valve. It is an object of the present invention to provide a water supply pump outlet valve control device which prevents this from occurring and protects a water supply pump outlet water supply pipe.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above-mentioned object, the water supply pump outlet valve control device of the present invention includes a water supply pump that sends the water sucked in from the water supply pump suction water supply pipe to the water supply pump outlet water supply pipe. , a water supply pump outlet water supply control valve and a water supply pump outlet water supply control valve release valve inserted in series in the water supply pump outlet water supply pipe, and a water supply that bypasses these water supply pump outlet water supply control valve and water supply pump outlet water supply control valve release valve. A water supply pump outlet valve control device used in a water supply system equipped with a pump outlet valve, which controls the water supply pump outlet valve when both the rotation speed of the water supply pump and the opening degree of the water supply control valve at the water supply pump outlet exceed a set value. In the water supply pump outlet valve control device, the water supply pump outlet valve is fully opened, and the water supply pump outlet valve is fully closed when the water supply pump rotation speed and the water supply pump outlet water supply adjustment valve opening degree are both below a set value. and a first AND circuit that fully opens the water supply pump outlet valve on the condition that the water supply pump outlet water supply control valve or the water supply pump outlet water supply control valve release valve is fully closed, and the water supply pump outlet valve is fully opened. activating the water supply pump up lock on the condition that the signal is not present and there is a signal from the first AND circuit;
The present invention is characterized by comprising a second AND circuit that maintains the current rotation speed of the water supply pump.

(Function) In the water supply pump outlet valve control device of the present invention configured as described above, the water supply pump outlet water supply control valve or the water supply pump outlet water supply control valve release valve is in a fully open state, and the rotation speed of the water supply pump is at a predetermined speed. If the value is greater than or equal to the value, the first AND circuit satisfies the AND condition and sends a fully open signal to the water supply pump outlet valve, and if the water supply pump outlet valve does not fully open despite this command, it outputs that detection signal and the above-mentioned first AND circuit. The signal from the first AND circuit is input to the second AND circuit, and the output locks the rotation speed of the water pump and maintains it as it is, ensuring that there is no abnormal pressure rise in the water supply pipe at the water pump outlet. Prevented.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the water supply pump outlet valve control device of the present invention, in which the water supply pump outlet valve 6 is connected to the button 1.
In addition to being able to fully open or close at will with 9, as mentioned above, there is an interlock that opens the water pump outlet valve 6 when switching from control valve control by the water pump outlet water control valve 2 to rotation speed control by the water feed pump 1. is (1) and (
2) When the AND condition of formula is satisfied, AND circuit 18 and O
A full open signal is given to the water pump outlet valve 6 via the R circuit 20. On the other hand, the interlock that closes the water supply pump outlet valve 6 when switching from the rotation speed control by the water supply pump to the control valve control by the water supply pump outlet water supply control valve 4 as the load decreases is determined by formula (3) and ( When the AND condition of formula 4) is satisfied, a full open signal is given to the water supply pump outlet valve 6 via the AND circuit 18 and the OR circuit 20.

In addition, when the outlet pressure of the water supply pump 1 becomes abnormally high during normal operation and exceeds the water pump outlet pressure high alarm point PANN, which is set at a predetermined level below the maximum operating design pressure of the water supply pump outlet water supply pipe 2, The system is configured to generate an alarm ANN and prompt the operator to take actions such as emergency tripping of the water pump.

The above configuration is similar to that of the conventional device described with reference to FIG. 6, but in the present invention, a two-stage protection circuit is further provided for the shut-off operation of the water pump.

The first stage protection circuit is the water supply pump outlet water supply control valve fully closed.
Or an OR that produces an output when either one or both conditions of the water supply pump outlet water supply control valve double valve fully closed f are satisfied.
It consists of a circuit 21 and a first AND circuit 22 which outputs an output under the AND condition of the output of this OR circuit and a predetermined set rotational speed S or more pm g of the water supply pump to generate i.

The output is sent to an alarm device (not shown) as an alarm signal ANNL.
to notify the operator of the occurrence of an abnormality. Output i is OR
It is led to the water pump outlet valve 6 via the circuit 20, and the water pump outlet valve is fully opened unconditionally. Also, AND circuit 2
When the AND condition of 2 is not satisfied, a signal 1 is outputted from the NOT circuit 23, and this signal is applied to the water supply pump outlet valve 6 via the OR circuit 20, thereby completely closing the water supply pump outlet valve 6.

In case the water supply pump outlet valve 6 does not fully open despite the input of the above-mentioned output 1, a signal j indicating that the water supply pump outlet valve 6 is not fully opened is generated in the NOT circuit 24, and this signal J and The signal k from the AND circuit 22 is
The signal l, which is input to the circuit 25 and outputted when the AND condition is met, is manually applied to the water pump rotation speed increase lock 26 to maintain the current rotation speed of the water pump, and the signal m is used as an alarm signal ANN2 to generate an alarm. equipment (not shown) to notify operators of abnormalities.

The above is the first stage protection circuit in the device of the present invention,
This makes it possible to suppress an abnormal increase in the water supply pressure at the outlet of the water supply pump, but in this embodiment, a second-stage backup protection circuit is provided to ensure further reliability.

This backup protection circuit generates signals n and n' when the water supply pump outlet water pressure exceeds the water supply pump outlet pressure high set value (Pmam mini-kg/cj, which is set to a predetermined value below the maximum operating design pressure). The signal n is input to the water supply pump outlet valve 6 via the OR circuit 20, and is fully opened unconditionally.

Further, even though the water supply pump outlet valve 6 is decided to be fully opened by the signal n, if this water supply pump outlet valve does not open, the signal n' is sent through the OR circuit 27 to the second AND signal together with the signal j. The circuit 25 is manually operated to maintain the water pump rotation speed at the current level by the water pump rotation speed increase lock 26 as in the case described above, and at the same time output the alarm signal ANN2.

In addition, the water supply pump outlet pressure high setting value (P − α
) kg/cJ is the ax water supply positive outlet pressure in a range that is not normally operated, and for the maximum operating design pressure,
It is set to a value with a predetermined margin.

Fig. 2 shows the main setting points of the device of the present invention on the Q-H characteristic curve of the feed water pump of the transformer power generation plant explained with reference to Fig. 5. An arbitrary rotational speed S of the water supply pump is set in the water supply control region beyond the control region a-b.

The AND circuit 22 establishes an AND condition by establishing the OR condition of the set rotation pm number S or more and the water supply pump outlet water supply control valve fully open or the water supply pump outlet water supply control valve consequent fully open,
Fully open the water supply pump outlet valve.

The highest operating design pressure operating point P on the system resistance curve SL is used as a backup protection circuit for this first stage protection circuit.
When the water supply pump outlet pressure high set value (P - α) kg/cd, which is set by adding a margin to the maximum operating design l1ax pressure MAXP, is exceeded, the water supply pump outlet valve is fully closed.

As mentioned above, the water supply pump is controlled so that it will not enter shut-off operation under any operating conditions by the two protection circuits that fully close the water supply pump outlet valve, but in the unlikely event that, for some reason, either of the protection circuits closes the water supply pump outlet valve. When the water supply pump outlet valve is not fully opened, the command to increase the water supply pump rotational speed is automatically locked.

Due to these actions, the operating point of the water supply pump is set to the water supply pump outlet pressure high setting value (P - α) kg/c + # and fla
X does not exceed the intersection point W with the system resistance curve SL.

In addition, an abnormality alarm for the operator is provided by AND circuit 22.25.
ANNI and ANN2 are automatically issued when the conditions of
It is not necessarily necessary to set NN and issue an alarm ANN when this is exceeded.

〔Effect of the invention〕

As described above, in the water supply pump outlet valve control device of the present invention, the water supply pressure of the water supply pump outlet water supply pipe is reliably prevented from exceeding the maximum operating design pressure, and the water supply pump and the water supply pump outlet water supply pipe can be operated safely. can do.

[Brief explanation of the drawing]

Fig. 1 is an interlock diagram functionally showing the configuration of the device of the present invention, Fig. 2 is a graph showing the operation of the device of the present invention on a water supply pump Q-H characteristic curve, and Fig. 3 is a schematic diagram of water supply flow rate control. A block diagram showing the configuration, FIG. 4 is a time chart explaining the operation of the device in FIG. 3, FIG. 5 is a graph showing the operation of the conventional device on the water pump Q-H characteristic curve, and FIG. FIG. 3 is an interlock diagram of the device. 1... Water supply pump, 2... Water supply pump outlet water supply pipe,
3... Check valve, 4... Water supply pump outlet water supply control valve,
5... Water supply pump outlet water supply adjustment valve rear valve, 6... Water supply pump outlet valve, 7... Water supply pump overheating prevention pipe, 8...
・Water pump overheating prevention valve, 9...Water pump overheating prevention valve multiple valves, 10...Water pump suction water supply pipe, 11...
Water supply pump suction flow rate transmitter, 12... Water supply pump rotation speed transmitter, 13... Water supply pump outlet water supply control valve opening transmitter, 14... Water supply flow rate control device, 15... Water supply pump outlet pressure Transmitter, 16...Water supply flow rate command, 17.
...Water supply command calculation section, 18...AND circuit, 19...
・Buttshu button. Applicant's representative Mr. Sato Figure 3 Figure 5

Claims (1)

[Scope of Claims] 1. A water supply pump that sends water sucked in from a water supply pump suction water supply pipe to a water supply pump outlet water supply pipe, a water supply pump outlet water supply control valve inserted in series with the water supply pump outlet water supply pipe, and A water supply pump outlet valve control device used in a water supply system comprising a water supply pump outlet water supply control valve rear valve and a water supply pump outlet valve that bypasses the water supply pump outlet water supply control valve rear valve and the water supply pump outlet water supply control valve rear valve. The water supply pump outlet valve is fully opened when the water supply pump rotation speed and the water supply pump outlet water supply control valve opening degree both exceed a set value,
In the water supply pump outlet valve control device that fully closes the water supply pump outlet valve when the water supply pump rotation speed and the water supply pump outlet water control valve opening degree both become below a set value, and the water supply pump exceeds the set value, and A first A that fully opens the water supply pump outlet valve on the condition that the water supply pump outlet water supply control valve or the rear valve of the water supply pump outlet water supply control valve is fully closed;
The ND circuit and the water pump outlet valve are not fully open.
and a second AND circuit that operates a water pump raising lock on the condition that a signal from the first AND circuit is present to maintain the current rotation speed of the water pump. Pump outlet valve control device. 2. Water pump outlet pressure high setting value (Pmax-α) kg/c, which is set so that the water pump outlet water supply pressure has a predetermined margin than the maximum operating design pressure of the water pump outlet water supply pipe.
The signal generated when m^2 is exceeded is input to the OR circuit together with the signal from the first AND circuit, and the output of this OR circuit is input to one terminal of the second AND circuit. A water supply pump outlet valve control device according to claim 1, characterized in that: 3. The water supply pump outlet valve control device according to claim 1 or 2, wherein the output of the first or second AND circuit is used as an alarm signal.