CN219446940U - Anti-freezing waterway system for car washer - Google Patents

Abstract

The utility model discloses an anti-freezing waterway system for a car washer, wherein an anti-freezing waterway assembly is arranged in a portal frame, a main waterway of the anti-freezing waterway assembly is communicated with a water separator, the water separator is respectively communicated with a gas circuit, a clear water pipeline, a foam pipeline and a water wax pipeline, the gas circuit and the foam pipeline are respectively communicated with a compressed air pump through pipelines, and one end of the foam pipeline is communicated with a foam spraying assembly through a pipeline; one end of the clear water pipeline is communicated with the clear water spraying assembly through a pipeline, and one end of the water wax pipeline is communicated with the water wax spraying assembly through a pipeline. The utility model has simple overall layout, realizes drainage in each branch, the main waterway and the water pump in the anti-freezing waterway assembly, prevents pipeline damage and water pump damage caused by freezing of a large amount of water in the pipeline and the water pump, can simply, efficiently and economically realize low-temperature protection of the car washer without heating water for the car washer or paving an insulating layer on the waterway of the car washer, can meet the requirements of quick washing and standard car washing, and realizes clean and efficient car washing.

Description

Anti-freezing waterway system for car washer

Technical Field

The utility model relates to the technical field of car washer equipment, in particular to an anti-freezing waterway system for a car washer.

Background

Most automatic car washes are all installed outdoors, and car washes all need lay water pipe and shower nozzle moreover, winter low temperature weather, and the pipeline freezes to block up, leads to the unable normal use of car washer, and the water in the car washer water pipe condenses into ice, and the volume expands rapidly, damages water pipe and shower nozzle easily. In the prior art, most of water storage equipment and a water pipe are heated and insulated by using an insulating layer or a heating device so as to prevent water from condensing, but the water pipe needs to be continuously heated, so that power consumption is also required when no person washes the water for a long time, and power resource waste and operation cost increase are caused. The vehicle washing demand in rainy and snowy weather in winter can be greatly reduced, and the water temperature is maintained by using a heating mode, so that the enterprise revenue is not facilitated.

Therefore, an antifreezing waterway system of the car washer is developed, and the low-temperature protection of the car washer can be simply, efficiently and economically realized.

Disclosure of Invention

In order to solve the technical problems, the utility model provides an antifreezing waterway system for a car washer.

The utility model provides the following technical scheme: a water route system prevents frostbite for car washer, its characterized in that: the anti-freezing water path assembly comprises a portal frame and an anti-freezing water path assembly, wherein the anti-freezing water path assembly is arranged in the portal frame and comprises a main water path, a water separator, a gas path, a foam pipeline, a clear water pipeline and a water wax pipeline, the main water path is communicated with the water separator, the water separator is respectively communicated with the gas path, the clear water pipeline, the foam pipeline and the water wax pipeline, the gas path and the foam pipeline are respectively communicated with a compressed air pump through pipelines, and one end of the foam pipeline is communicated with the foam spraying assembly through a pipeline; clear water pipeline one end is through pipeline and clear water spray assembly intercommunication, water wax pipeline one end is through pipeline and water wax spray assembly intercommunication, water wax spray assembly, clear water spray assembly and foam spray assembly all fixed mounting in on the portal frame.

Preferably, the air path comprises a first one-way valve and a first electromagnetic valve, the first one-way valve is communicated with the water separator, the first one-way valve is communicated with the first electromagnetic valve through a pipeline, and one end of the first electromagnetic valve is communicated with the compressed air pump.

Preferably, the main waterway comprises a water tank, a first ball valve, a three-way valve, a water pump and a main water inlet, wherein the water tank is sequentially communicated with the first ball valve, the three-way valve, the water pump and the main water inlet through pipelines, and the main water inlet is communicated with the water separator.

Preferably, the foam pipeline includes second ball valve, second solenoid valve, foam interface, first measuring pump and second check valve, the intercommunication has the second ball valve on the water knockout drum, second ball valve one end and second solenoid valve intercommunication, second solenoid valve one end and foam interface intercommunication, pass through pipeline and first measuring pump intercommunication on the foam interface, foam interface one end and foam outlet intercommunication, foam outlet upper end and second check valve intercommunication, pass through the pipeline on the second check valve with the compressed air pump intercommunication, the foam outlet with the foam sprays subassembly adaptation and is connected.

Preferably, the water wax pipeline comprises a third ball valve, a third electromagnetic valve, a water wax interface and a second metering pump, the third ball valve is communicated with the water separator, one end of the third ball valve is communicated with the third electromagnetic valve, one end of the third electromagnetic valve is communicated with the water wax interface, the water wax interface is communicated with the second metering pump through a pipeline, one end of the water wax interface is provided with a water wax outlet, and one end of the water wax outlet is connected with the water wax spraying assembly in an adapting mode.

Preferably, the clear water pipeline comprises a fourth ball valve, a fourth electromagnetic valve, a fourth one-way valve and a clear water interface, the fourth ball valve is communicated with the water distributor, one end of the fourth ball valve is communicated with the fourth electromagnetic valve, one end of the fourth electromagnetic valve is communicated with the clear water interface, the fourth one-way valve is arranged at the upper end of the clear water interface, the fourth one-way valve is communicated with the compressed air pump through a pipeline, and one end of the clear water interface is connected with the clear water spraying assembly in an adapting mode.

Preferably, the clear water spray assembly comprises a side spray assembly, a bottom spray assembly and a top spray assembly, wherein the side spray assembly and the bottom spray assembly are arranged at intervals and are arranged behind the foam spray assembly, and the top spray assembly is arranged above the rear of the side spray assembly.

Preferably, a fifth electromagnetic valve and a pressure regulating valve are respectively arranged on the pipeline between the second one-way valve and the compressed air pump.

Preferably, a baffle is arranged on one side of the portal frame opposite to the antifreezing waterway assembly.

Preferably, the water separator is also provided with an access valve.

Compared with the prior art, the utility model has the beneficial effects that:

(1) The utility model is characterized in that an antifreezing waterway assembly is arranged in a portal frame, a main waterway of the antifreezing waterway assembly is communicated with a water separator, the water separator is respectively communicated with a gas circuit, a clear water pipeline, a foam pipeline and a water wax pipeline, the gas circuit and the foam pipeline are respectively communicated with a compressed air pump through pipelines, and one end of the foam pipeline is communicated with a foam spraying assembly through a pipeline; clear water pipeline one end is through pipeline and clear water spray assembly intercommunication, and water wax pipeline one end is through pipeline and water wax spray assembly intercommunication, and water wax spray assembly, clear water spray assembly and foam spray the equal fixed mounting of subassembly on the portal frame, and whole overall arrangement is retrencied, realizes the drainage in each branch road in the water route subassembly that prevents frostbite, main water route and the water pump, prevents pipeline damage and the water pump damage that a large amount of water in pipeline and the water pump from freezing and lead to, need not to use water through heating car washer, need not to lay the heat preservation at car washer water route, just can simply high-efficient economic realization car washer low temperature protection, compatible quick wash and standard car washing demand, realizes that the carwash is clean high-efficient.

Drawings

FIG. 1 is a schematic diagram of the operation of the antifreeze waterway assembly of the present utility model;

FIG. 2 is a schematic structural view of the antifreeze waterway assembly of the present utility model;

FIG. 3 is a schematic diagram of the overall structure of the present utility model;

fig. 4 is a side view of fig. 3 of the present utility model.

Detailed Description

As shown in fig. 1 to 4, the portal frame 1, the antifreeze waterway assembly 2, the main waterway 3, the water knockout drum 4, the foam pipeline 5, the clean water pipeline 6, the water wax pipeline 7, the compressed air pump 8, the foam spray assembly 9, the clean water spray assembly 10, the water wax spray assembly 11, the first solenoid valve 12, the first check valve 13, the water tank 14, the first ball valve 15, the water pump 16, the three-way valve 17, the main water inlet 18, the second ball valve 19, the second solenoid valve 20, the foam interface 21, the first metering pump 22, the second check valve 23, the foam outlet 24, the third ball valve 25, the third solenoid valve 26, the water wax interface 27, the second metering pump 28, the water wax outlet 30, the fourth ball valve 31, the fourth solenoid valve 32, the fourth check valve 33, the clean water interface 34, the side spray assembly 35, the bottom spray assembly 36, the top spray assembly 37, the fifth solenoid valve 38, the pressure regulating valve 39, the partition 40, the service valve 41, and the sixth solenoid valve 42.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," and the like are used as an orientation or positional relationship based on that shown in the drawings, merely to facilitate description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1 to 4, an antifreeze waterway assembly 2 is provided in a gantry 1, and a partition plate 40 is provided on the gantry on the opposite side to the antifreeze waterway assembly 2, i.e., on the side where the electric components are installed, the partition plate 40 being for preventing water from entering the electric component area. The water wax spraying assembly 11, the clear water spraying assembly 10 and the foam spraying assembly 9 are fixedly arranged on the portal frame 1, the clear water spraying assembly 10 comprises a side spraying assembly 35, a bottom spraying assembly 36 and a top spraying assembly 37, the side spraying assembly 35 and the bottom spraying assembly 36 are arranged at intervals and are all arranged behind the foam spraying assembly 9, the top spraying assembly 37 is arranged above the rear part of the side spraying assembly 35, as shown in fig. 3 to 4, foam, clear water and water wax spraying positions are reasonably distributed according to car washing habits, the sprayed foam is in front, clear water is centered, and the water wax is last; specifically, each pipeline of water wax spray assembly 11, clear water spray assembly 10 and foam spray assembly 9 sets up in the box inside of car washer portal frame 1, only leaves the nozzle outside the box of portal frame 1, and the lifting means aesthetic property, spray the universal joint nozzle of subassembly and can adjust the nozzle angle according to actual conditions, reach the best effect of spraying, the waterway pipe is built-in, for guaranteeing that other electrical components that still set up in portal frame 1 are safe, be provided with baffle 40 between circuit assembly and waterway system and keep apart.

The clear water spray assembly 10 realizes the flushing of all directions of the vehicle, prevents foam residue, and the side spray assembly 35 and the bottom spray assembly 36 are arranged at intervals and are divided into an upper part and a lower part, so that the car washer can be split and transported up and down when necessary.

After the brushing is finished, the sixth electromagnetic valve 42 is opened, compressed air enters the clean water pipeline 6 through the fourth one-way valve 33 and is used for draining excessive water in the pipeline after the vehicle is washed, so that excessive water drops in the drying process are prevented from falling onto the vehicle body. This setting is in order to prevent that the pipeline overlength can lead to even after the control valve closes, still can remain a large amount of water in the pipeline and continue the whereabouts from the nozzle, leads to still leaving obvious waterline on the vehicle after the car washer weathers, influences the carwash effect.

The antifreezing waterway assembly 2 comprises a main waterway 3, a water separator 4, a gas circuit, a foam pipeline 5, a clear water pipeline 6 and a water wax pipeline 7, wherein the main waterway 3 is communicated with the water separator 4, and a maintenance valve 41 is further arranged on the water separator 4 and is used for removing residual water in the pipeline during maintenance; the water separator 4 is respectively communicated with a gas circuit, a clear water pipeline 6, a foam pipeline 5 and a water wax pipeline 7, the gas circuit and the foam pipeline 5 are respectively communicated with a compressed air pump 8 through pipelines, and one end of the foam pipeline 5 is communicated with a foam spray assembly 9 through a pipeline; one end of the clear water pipeline 6 is communicated with the clear water spraying assembly 10 through a pipeline, one end of the water wax pipeline 7 is communicated with the water wax spraying assembly 11 through a pipeline,

the gas circuit includes first solenoid valve 12 and first check valve 13, and the last intercommunication of water knockout drum 4 has first check valve 13, and first check valve 13 communicates with first solenoid valve 12 through the pipeline, and first solenoid valve 12 one end communicates with compressed air pump 8.

Specifically, as shown in fig. 2, the solenoid valve 32 is kept closed, the sixth solenoid valve 42 is opened, and compressed air is introduced into the clean water line 6 through the fourth check valve 33, and the remaining water in the clean water line 6 is discharged. As another embodiment of the air path scheme, after brushing, the sixth electromagnetic valve 42 and the fourth one-way valve 33 are canceled, the first electromagnetic valve 12 is opened, the compressed air is introduced into the water separator 4 through the first one-way valve 13, at this time, the second electromagnetic valve 20 and the third electromagnetic valve 26 are both closed, the compressed air enters the clear water pipeline 6, the residual water in the clear water pipeline 6 is discharged, and the excessive water drops on the vehicle body in the drying process are prevented.

The main waterway 3 comprises a water tank 14, a first ball valve 15, a three-way valve 17, a water pump 16 and a main water inlet 18, wherein the water tank 14 is sequentially communicated with the first ball valve 15, the three-way valve 17, the water pump 16 and the main water inlet 18 through pipelines, the main water inlet 18 is communicated with the water separator 4, the three-way valve 17 can switch a water inlet, one end of the three-way valve is communicated with the water pump 16, and the other end of the three-way valve is communicated with the atmosphere, specifically, when a temperature sensor on the car washer detects that the ambient temperature is lower than a set value, the car washer needs to drain (at the moment, the water pump 16 is in a closed state and does not supply water to the whole waterway system): the drainage conditions of each branch are as follows: opening the first electromagnetic valve 12, sequentially opening the second electromagnetic valve 20, the third electromagnetic valve 26 and the fourth electromagnetic valve 32, and enabling compressed air to enter the water separator 4 through the first one-way valve 13 to drain the foam pipeline 5, the water wax pipeline 7 and the clear water pipeline 6 respectively; the main road drainage condition is: when the water is discharged, the second electromagnetic valve 20, the third electromagnetic valve 26 and the fourth electromagnetic valve 32 are kept closed, the three-way valve 17 is electrified to switch the water inlet, one end of the three-way valve is communicated with the water pump, the other end of the three-way valve is communicated with the atmosphere, the first electromagnetic valve 12 is opened, compressed air enters the water separator 4 through the first one-way valve 13, and water in a pipeline is discharged from the three-way valve 17 through the water pump 16. So far, the drainage of each branch, the main waterway and the water pump 16 in the waterway system is realized, the pipeline damage caused by the icing of a large amount of water in the pipeline and the water pump 16 and the damage of the water pump 16 are prevented, when the main water inlet 18 is connected with the main pipeline of the water separator 4 for drainage, each branch needs to be closed, otherwise, the compressed air is discharged from the nozzle opening of each branch (the compressed air can travel to the low pressure position), and the drainage effect of the main waterway 3 is affected.

The foam pipeline 5 comprises a second ball valve 19, a second electromagnetic valve 20, a foam interface 21, a first metering pump 22 and a second one-way valve 23, wherein the second ball valve 19 is communicated with the water distributor 4, one end of the second ball valve 19 is communicated with the second electromagnetic valve 20, one end of the second electromagnetic valve 20 is communicated with the foam interface 21, the foam interface 21 is communicated with the first metering pump 22 through a pipeline, one end of the foam interface 21 is communicated with a foam outlet 24, the upper end of the foam outlet 24 is communicated with the second one-way valve 23, the second one-way valve 23 is communicated with the compressed air pump 8 through a pipeline, a fifth electromagnetic valve 38 and a pressure regulating valve 39 are further arranged on the pipeline between the second one-way valve 23 and the compressed air pump 8 respectively, the foam outlet 24 is connected with the foam spraying assembly 9 in an adapting way, in the use process, the first metering pump 22 pumps car washing liquid and compresses compressed air in the compressed air pump 8, so that the required foam effect is realized, and the size and the water flow of the compressed air in the air pipeline 5 are regulated.

The water wax pipeline 7 comprises a third ball valve 25, a third electromagnetic valve 26, a water wax interface 27 and a second metering pump 28, the third ball valve 25 is communicated with the water separator 4, one end of the third ball valve 25 is communicated with the third electromagnetic valve 26, one end of the third electromagnetic valve 26 is communicated with the water wax interface 27, the water wax interface 27 is communicated with the second metering pump 28 through a pipeline, one end of the water wax interface 27 is provided with a water wax outlet 30, and one end of the water wax outlet 30 is connected with the water wax spray assembly 11 in an adapting way.

The clear water pipeline 6 comprises a fourth ball valve 31, a fourth electromagnetic valve 32, a fourth one-way valve 33 and a clear water interface 34, the fourth ball valve 31 is communicated with the water separator 4, one end of the fourth ball valve 31 is communicated with the fourth electromagnetic valve 32, one end of the fourth electromagnetic valve 32 is communicated with the clear water interface 34, the fourth one-way valve 33 is arranged at the upper end of the clear water interface 34, the fourth one-way valve 33 is communicated with the compressed air pump 8 through a pipeline, a sixth electromagnetic valve 42 is arranged on the pipeline between the fourth one-way valve 33 and the compressed air pump 8, and one end of the clear water interface 34 is connected with the clear water spray assembly 10 in an adapting way.

The working principle of the utility model is as follows: when the outdoor temperature is too low, the car washer needs to drain (at the moment, the water pump 16 is in a closed state and does not supply water to the main waterway 3), the first electromagnetic valve 12 is opened, the second electromagnetic valve 20, the third electromagnetic valve 26 and the fourth electromagnetic valve 32 are sequentially opened, and compressed air generated in the compressed air pump 8 enters the water separator 4 through the first one-way valve 13 to drain the foam pipeline 5, the water wax pipeline 7 and the clear water pipeline 6 respectively;

keeping the second electromagnetic valve 20, the third electromagnetic valve 26 and the fourth electromagnetic valve 32 closed, energizing the three-way valve 17, and opening the first electromagnetic valve 12, compressed air generated in the compressed air pump 8 enters the water separator 4 through the first one-way valve 13, so that water in the pipeline is discharged from the three-way valve 17 through the water pump 16. So far, the drainage of each branch and the main waterway 3 in the antifreezing waterway system is realized, and the pipeline and the water pump 16 are prevented from being damaged due to the icing of a large amount of water in the pipeline and the water pump 16.

The normal cleaning mode is as follows: the car washing is started, pre-cleaning spraying is carried out, clear water is sprayed by the clear water spraying component 10, wetting of the car body and a brush of the car washer is achieved, foam is sprayed by the foam spraying component 9 after backwashing, and the foam covers the car body; during brushing, the clean water spraying assembly 10 sprays clean water, so that the brush of the car washer is kept moist with the car body, foam sprayed by the foam spraying assembly 9 is washed, and during backwashing, the clean water spraying assembly 10 sprays clean water and the water wax spraying assembly 11 sprays wax.

The utility model has simple integral structure, realizes the drainage of each branch and the main waterway 3 in the anti-freezing waterway assembly 2, prevents pipeline damage and water pump 16 damage caused by icing of a large amount of water in the pipeline and the water pump 16, can simply, efficiently and economically realize the low-temperature protection of the car washer without heating the water of the car washer or paving an insulating layer on the waterway of the car washer, can be compatible with the requirements of quick washing and standard car washing, and realizes the clean and high-efficiency of the car washing.

The present utility model is not limited to the above-mentioned embodiments, and any person skilled in the art, based on the technical solution of the present utility model and the inventive concept thereof, can be replaced or changed within the scope of the present utility model.

Claims (10)

1. A water route system prevents frostbite for car washer, its characterized in that: the anti-freezing water pump device comprises a portal frame (1) and an anti-freezing water channel assembly (2), wherein the anti-freezing water channel assembly (2) is arranged in the portal frame (1), the anti-freezing water channel assembly (2) comprises a main water channel (3), a water separator (4), a gas channel, a foam pipeline (5), a clear water pipeline (6) and a water wax pipeline (7), the main water channel (3) is communicated with the water separator (4), the water separator (4) is respectively communicated with the gas channel, the clear water pipeline (6), the foam pipeline (5) and the water wax pipeline (7), the gas channel and the foam pipeline (5) are respectively communicated with a compressed air pump (8) through pipelines, and one end of the foam pipeline (5) is communicated with a foam spraying assembly (9) through pipelines; clear water pipeline (6) one end is through pipeline and clear water spray assembly (10) intercommunication, water wax pipeline (7) one end is through pipeline and water wax spray assembly (11) intercommunication, water wax spray assembly (11), clear water spray assembly (10) and foam spray assembly (9) all fixed mounting in on portal frame (1).

2. An antifreeze waterway system for a car washer according to claim 1, wherein: the air circuit comprises a first electromagnetic valve (12) and a first one-way valve (13), wherein the first one-way valve (13) is communicated with the water separator (4), the first one-way valve (13) is communicated with the first electromagnetic valve (12) through a pipeline, and one end of the first electromagnetic valve (12) is communicated with the compressed air pump (8).

3. An antifreeze waterway system for a car washer according to claim 2, wherein: the main waterway (3) comprises a water tank (14), a first ball valve (15), a three-way valve (17), a water pump (16) and a main water inlet (18), wherein the water tank (14) is sequentially communicated with the first ball valve (15), the three-way valve (17), the water pump (16) and the main water inlet (18) through pipelines, and the main water inlet (18) is communicated with the water separator (4).

4. An antifreeze waterway system for a car washer according to claim 3, wherein: foam pipeline (5) are including second ball valve (19), second solenoid valve (20), foam interface (21), first metering pump (22) and second check valve (23), the intercommunication has second ball valve (19) on water knockout drum (4), second ball valve (19) one end and second solenoid valve (20) intercommunication, second solenoid valve (20) one end and foam interface (21) intercommunication, through pipeline and first metering pump (22) intercommunication on foam interface (21), foam interface (21) one end and foam export (24) intercommunication, foam export (24) upper end and second check valve (23) intercommunication, on second check valve (23) through the pipeline with compressed air pump (8) intercommunication, foam export (24) with foam spray subassembly (9) adaptation is connected.

5. An antifreeze waterway system for a car washer according to claim 4, wherein: the water wax pipeline (7) comprises a third ball valve (25), a third electromagnetic valve (26), a water wax interface (27) and a second metering pump (28), wherein the third ball valve (25) is communicated with the water distributor (4), one end of the third ball valve (25) is communicated with the third electromagnetic valve (26), one end of the third electromagnetic valve (26) is communicated with the water wax interface (27), the water wax interface (27) is communicated with the second metering pump (28) through a pipeline, a water wax outlet (30) is formed in one end of the water wax interface (27), and one end of the water wax outlet (30) is connected with the water wax spraying assembly (11) in an adapting mode.

6. An antifreeze waterway system for a car washer according to claim 5, wherein: clear water pipeline (6) are including fourth ball valve (31), fourth solenoid valve (32), fourth check valve (33) and clear water interface (34), the intercommunication has fourth ball valve (31) on water knockout drum (4), fourth ball valve (31) one end and fourth solenoid valve (32) intercommunication, fourth solenoid valve (32) one end and clear water interface (34) intercommunication, clear water interface (34) upper end is equipped with fourth check valve (33), on fourth check valve (33) through the pipeline with compressed air pump (8) intercommunication, clear water interface (34) one end with clear water spray subassembly (10) adaptation is connected.

7. An antifreeze waterway system for a car washer according to claim 1 or 6, wherein: the clean water spray assembly (10) comprises a side spray assembly (35), a bottom spray assembly (36) and a top spray assembly (37), wherein the side spray assembly (35) and the bottom spray assembly (36) are arranged at intervals and are arranged behind the foam spray assembly (9), and the top spray assembly (37) is arranged above the rear of the side spray assembly (35).

8. An antifreeze waterway system for a car washer according to claim 4, wherein: a fifth electromagnetic valve (38) and a pressure regulating valve (39) are respectively arranged on the pipeline between the second one-way valve (23) and the compressed air pump (8).

9. An antifreeze waterway system for a car washer according to claim 1, wherein: and a baffle plate (40) is arranged on one side, opposite to the antifreezing waterway assembly (2), of the portal frame (1).

10. An antifreeze waterway system for a car washer according to claim 1, wherein: and the water separator (4) is also provided with an overhaul valve (41).