SU939179A1

SU939179A1 - Air-distributing apparatus of pneumatic hammer

Info

Publication number: SU939179A1
Application number: SU813272992A
Authority: SU
Inventors: Николай Александрович Клушин; Эдуард Александрович Абраменков; Юрий Михайлович Башлыков; Владимир Николаевич Карминский; Анатолий Матвеевич Добрюк; Владимир Иванович Кокарев
Original assignee: Институт Горного Дела Со Ан Ссср; Томский Электромеханический Завод Им.В.В.Вахрушева
Priority date: 1981-04-08
Filing date: 1981-04-08
Publication date: 1982-06-30

Description

Изобретение относится к горным и' строительным машинам и может быть использовано при создании пневматических машин ударно-вращательного, j ударно поворотного и ударного действия как ручных, так и не ручных.The invention relates to mining and construction machinery and can be used to create pneumatic shock-rotary machines, j rotary and impact machines, both manual and non-manual.

Известна конструкция пневматического молотка, содержащего рукоятку, инструмент, корпус с ударником и воз- jq духораспределение в виде трубчатого цилиндрического клапана, размещенного в гнезде клапанной коробки с боковыми подводящими и отводящими воздушными каналами [1].A known construction of a pneumatic hammer containing a handle, a tool, a body with a hammer and air distribution in the form of a tubular cylindrical valve located in a valve box socket with lateral inlet and outlet air channels [1].

Недостатками такого технического ’5 решения являются преобладающее трение боковой площадки клапана в гнезде и отсутствие площадок подтекания воздуха, обуславливающих неравномерное истирание боковой площадки клапана и задержку его при перемещении, включая начало и конец перекидки, что нарушает устойчивую работу воздухораспределительного устройства и пневматического молотка в целом. 25The disadvantages of this technical ’5 solution are the predominant friction of the side of the valve in the seat and the absence of air leakage areas causing uneven abrasion of the side of the valve and its delay in movement, including the beginning and end of the transfer, which disrupts the stable operation of the air distribution device and the pneumatic hammer as a whole. 25

Наиболее близким по технической сущности и достигаемому результату к предлагаемому является воздухораспределительное устройство пневматического молотка, включающее кольце- 30 вую клапанную коробку с ограничивающей обечайкой и гнездом, в котором расположен цилиндрический трубчатый клапан, и воэдухоподводящие каналы [2]. Недостатком указанного устройства является постоянное трение опорной торцовой поверхности цилиндрического клапана о посадочную площадку гнезда в клапанной коробке, обусловливающее задержки в переключении. Кроме того, перекос клапана в осевом направлении приводит к деформации торцовых кромок клапана от ударов (во время его перекидки) о боковые поверхности гнезда клапанной коробки. После приработки клапан приобретает бочкообразную форму вместо цилиндрической, что увеличивает непроизвольные утечки сжатого воздуха через образующиеся зазоры между боковыми поверхностями клапана и гнезда в ко*/ робке.The closest in technical essence and the achieved result to the proposed one is an air distribution device of a pneumatic hammer, including an annular valve box with a restricting shell and a socket in which a cylindrical tubular valve is located, and air-supply channels [2]. The disadvantage of this device is the constant friction of the supporting end surface of the cylindrical valve on the landing pad of the socket in the valve box, causing delays in switching. In addition, the bias of the valve in the axial direction leads to deformation of the end edges of the valve from impacts (during its transfer) on the side surfaces of the valve box socket. After running-in, the valve acquires a barrel-like shape instead of a cylindrical one, which increases the involuntary leakage of compressed air through the formed gaps between the side surfaces of the valve and the socket in the box.

Цель изобретения - повышение надежности запуска и работы воздухораспределительного устройства.The purpose of the invention is to increase the reliability of the launch and operation of the air distribution device.

Поставленная цель достигается тем, что на торцах трубчатого клапана выполнены радиальныё прорези, при этом оси клапана и клапанной коробки взаимно перпендикулярны.This goal is achieved by the fact that the ends of the tubular valve are made radial slots, while the axis of the valve and valve box are mutually perpendicular.

В клапанной коробке может быть выполнено несколько гнезд, в которых расположены трубчатые клапаны.In the valve box, several sockets can be made in which the tubular valves are located.

На фиг. 1 представлен пневматический молоток с воздухораспределительным устройством, частичный разрез; 5 на фиг. 2 - клапанная коробка, разрез по клапанным гнездам.In FIG. 1 shows a pneumatic hammer with an air distribution device, a partial section; 5 in FIG. 2 - valve box, section through valve seats.

Пневматический молоток содержит цилиндр 1, ударник 2, рукоятку 3 с пусковым устройством (не показано) щ любой конструкции, рабочий инструментThe pneumatic hammer contains a cylinder 1, a hammer 2, a handle 3 with a starting device (not shown) of any design, a working tool

4. Ударник 2 разделяет центральный канал цилиндра 1 на полости 5 и 6 холостого и рабочего ходов. На торце цилиндра 1 со стороны рукоятки З.установлена кольцевая клапанная коробка 7 с гнездом 8 и цилиндрическим трубчатым клапаном 9 в нем. Торцы клапана 9 снабжены прорезями 10 и выступами 11.4. Drummer 2 divides the central channel of cylinder 1 into cavities 5 and 6 of the idle and working strokes. At the end of the cylinder 1 from the side of the handle Z. an annular valve box 7 with a socket 8 and a cylindrical tubular valve 9 is installed in it. The ends of the valve 9 are provided with slots 10 and protrusions 11.

Применение нескольких одноименных ^2иклапанов способствует повышению стабильности! запуска и работы воздухораспределительного устройства и молотка в целом.The use of several of the same name ^{2 and} valves improves stability! start-up and operation of the air distribution device and the hammer as a whole.

Снаружи коробки 7 размещена ограж-²⁵дающая обечайка 12, выполненная в виде кольца с окнами 13 для удержания клапанов 9 от выпадания из гнезд 8 и пропуска воздуха в гнездо из кольцевой предкамеры 14, которая со- ^0 общена с сетью сжатого воздуха через1 каналы в цилиндре 1 и пусковое устройство в рукоятке 3. Клапанная коробка 7 прижата к торцу цилиндра 1 крышкой 15 с камерой 16. Гнездо 8 35 коробки 7 снабжено сквозными выходящими на торцы коробки каналами 17 и 18, сообщающими полость гнезда соответственно с полостью 5 через канал 19 в цилиндре 1 и с камерой 16 и по- 40 лостью 6. Цилиндр 1 снабжен выпускным каналом 20, через который полости 5 и 6 периодически сообщаются с атмосферой и опорожняются.Outside the box 7 there is a guard shell ²⁵ giving a shell 12 made in the form of a ring with windows 13 to keep the valves 9 from falling out of the sockets 8 and passing air into the socket from the annular precamera 14, which is connected to the compressed air network through 1 channels in the cylinder 1 and the starting device in the handle 3. The valve box 7 is pressed against the end of the cylinder 1 with a cover 15 with a chamber 16. The socket 8 35 of the box 7 is equipped with through channels 17 and 18 extending to the ends of the box, communicating the cavity of the socket with cavity 5, respectively, through channel 19 in cylinder 1 and with a camera 16 and - 40 by the cavity 6. The cylinder 1 is equipped with an exhaust channel 20, through which the cavities 5 and 6 periodically communicate with the atmosphere and empty.

Пневматический молоток работает 45 следующим образом.Air hammer works 45 as follows.

При нажатии на рукоятку 3 включается пусковое устройство (не показано) , и сжатый воздух из сети поступает в кольцевую предкамеру 14, откуда через впускные окна 13 - в полость гнезда 8 с трубчатым клапаном 9. В зависимости от положения клапанов 9 и ударника 2 воздух из гнезда 8 поступает или по каналу 18 в камеру 16 и полость 6 (фиг. 2, левое положение $5 клапана), или по каналу 17 и 19 в камеру 5 (фиг. 2, правое положение клапана).When the handle 3 is pressed, the starting device (not shown) is turned on, and compressed air from the network enters the annular chamber 14, from where it passes through the inlet windows 13 into the cavity of the socket 8 with the tubular valve 9. Depending on the position of the valves 9 and the hammer 2, the air from socket 8 enters either through channel 18 into chamber 16 and cavity 6 (Fig. 2, valve left position $ 5), or through channel 17 and 19 into chamber 5 (Fig. 2, right valve position).

Согласно положению молотка, изображенному на фиг. 1, сжатый воздух 60 из гнезда 8 поступает через канал 18 в камеру 16 и полость 6, откуда посредством выпускного канала 20 - в атмосферу, и давление в полости гнезда 8 со стороны канала 18 понижается. 65According to the hammer position shown in FIG. 1, the compressed air 60 from the socket 8 enters through the channel 18 into the chamber 16 and the cavity 6, from where through the exhaust channel 20 to the atmosphere, and the pressure in the cavity of the socket 8 from the channel 18 decreases. 65

Сетевой воздух, подтекающий благодаря прорезям 10 под клапан 9, повышает давление на него со стороны канала 17, и клапан перемещается в сторону канала 18 и перекрывает его.The network air flowing through the slots 10 under the valve 9 increases the pressure on it from the side of the channel 17, and the valve moves towards the channel 18 and closes it.

Прорези .10 на торцах клапана 9 позволяют реализовать равномерное подтекание сетевого воздуха с обеих торцов, и клапан, таким образом, в период своего перемещения поддерживается в полости гнезда без перекоса. Этому устойчивому положению клапана способствуют меньшие силы трения со стороны его торца, скользящего по внутренней поверхности гнезда. Меньшие силы трения обуславливаются площадью выступов 11, меньшей площади сплошного торца на величину площади прорезей 10.· Кроме того, сетевой воздух, омывающий равномерно со всех сторон клапан 9, благодаря прорезям 10 поддерживает его в устойчивом положении как после отрыва, так и во время движения до момента посадки. Отсутствие перекоса клапана 9 предохраняет его торцовые отсечные кромки и боковую поверхность от деформации. При этом искривления боковой поверхности клапана не происходит и зазоров между клапаном и внутренней поверхностью гнезда клапана не образуется, что позволяет избежать непроизвольных утечек сжатого воздуха из сети через молоток. После перекрытия клапаном 9 канала 18 воздух из сети прекращает поступать в камеру 16 и полость 6, давление в которой устанавливается близким по величине к атмосферному.The slots .10 on the ends of the valve 9 make it possible to realize uniform leakage of the network air from both ends, and the valve is thus supported in the cavity of the socket without distortion during its movement. This stable position of the valve is facilitated by lower friction forces from the side of its end, sliding along the inner surface of the socket. Smaller friction forces are determined by the area of the protrusions 11, the smaller the area of the solid end by the area of the slots 10. · In addition, the network air, washing the valve 9 evenly from all sides, thanks to the slots 10, keeps it in a stable position both after separation and during movement until landing. The lack of bias of the valve 9 protects its end cut-off edges and side surface from deformation. In this case, curvature of the side surface of the valve does not occur and gaps between the valve and the inner surface of the valve seat are not formed, which avoids the involuntary leakage of compressed air from the network through the hammer. After the valve 9 closes the channel 18, the air from the network stops flowing into the chamber 16 and the cavity 6, the pressure in which is set close to atmospheric pressure.

Таким образом, сетевой воздух из предкамеры 14 через окно 13 поступает в полость гнезда 8, откуда по каналам 17 и 19 - в камеру 5, давление в которой начинает повышаться. Разность сил давления на торцы ударника 2 со стороны полостей 5 и 6 обусловливает его движение от инструмента совершается холостой ход. В силу ускоренного движения ударника 2 давление в полости 5, канале 19 и под клапаном 9 заметно уменьшается, а после открытия выпускного окна 20 резко понижается до атмосферного. Давление воздуха на клапан 9 со стороны канала 18 в этот период, возрастает за счет сжатия отсеченного в полости 6 и камере 16 воздуха, а также подтекания сетевого воздуха под клапан благодаря прорезям 10. Под действием перепада давления клапан 9 перемещается в сторону канала 17, открывая поступление сетевого воздуха через канал 18 в камеру 16 и полость 6, увеличивая в последней противодавление, чем обусловвливается торможение ударника 2 в конце холостого хода.Thus, the network air from the pre-chamber 14 through the window 13 enters the cavity of the socket 8, from where it passes through the channels 17 and 19 into the chamber 5, the pressure in which begins to increase. The difference in pressure on the ends of the drummer 2 from the side of the cavities 5 and 6 determines its movement from the tool idle. Due to the accelerated movement of the striker 2, the pressure in the cavity 5, channel 19 and under the valve 9 decreases noticeably, and after opening the outlet window 20 drops sharply to atmospheric. The air pressure on the valve 9 from the side of the channel 18 during this period increases due to the compression of the air cut off in the cavity 6 and the chamber 16, as well as the leakage of network air under the valve due to the slots 10. Under the influence of the differential pressure, the valve 9 moves towards the channel 17, opening the flow of air through the channel 18 into the chamber 16 and the cavity 6, increasing in the latter backpressure, which determines the braking of the hammer 2 at the end of idling.

Клапан 9, перемещаясь в сторону канала 17, своим торцом скользит по поверхности глухого торца гнезда 8. Поскольку площадь выступов 11 со стороны торца клапана 9 меньше площади сплошного торца на величину площади прорезей 10, то силы трения в меньшей степени вызывают перекос клапана. 5 Кроме того, сетевой воздух, омывающий со всех сторон клапан 9, благодаря прорезям 10 поддерживает его в устойчивом положении до момента закрытия им канала 17. После закрытия клапа- 10 ном 9 канала 17 поступление сетевого воздуха в канал 19 и камеру 5 прекращается.The valve 9, moving towards the channel 17, slides with its end along the surface of the blind end of the socket 8. Since the area of the protrusions 11 from the side of the end of the valve 9 is less than the area of the solid end by the size of the slots 10, the friction forces cause the valve to skew to a lesser extent. 5 In addition, the network air, which flaps the valve 9 from all sides, thanks to the slots 10, keeps it in a stable position until the channel 17 closes. After closing the valve 10 of channel 9, the air supply to the channel 19 and the chamber 5 is stopped.

Продолжая холостой ход, ударник 2 под действием сил торможения со сто- 15 роны полости 6 и камеры 16 останавливается и начинает ускоренное движение к инструменту 4, совершая рабочий ход. При ускоренном движении ударника 2 к инструменту 4 давление в по- 20 лости 6 и камере 16, а также в канале 18 постепенно снижается, а после открытия выпускного канала 20 понижается до уровня атмосферного.. Силы давления, действующие на клапан 9 со стороны канала 18, также существенно уменьшаются. После перекрытия ударником 2 выпускного канала 20 в полости 5 начинается сжатие отсеченного там свободного воздуха.Continuing idling, the hammer 2 under the action of braking forces from the side of the cavity 6 and the chamber 16 stops and begins accelerated movement to the tool 4, making a working stroke. With the accelerated movement of the hammer 2 to the tool 4, the pressure in the cavity 20 and chamber 16, as well as in the channel 18, gradually decreases, and after opening the outlet channel 20 decreases to atmospheric level. Pressure forces acting on the valve 9 from the channel 18 side are also significantly reduced. After the drummer 2 closes the exhaust channel 20 in the cavity 5, compression of the free air cut off there begins.

Под действием возрастающего давления воздуха со стороны канала 17 и подтекания сетевого воздуха через прорези 10 под опорную боковую поверхность клапана 9 последний начинает перемещение в сторону канала 18 35 и перекрывает его. Перемещение клала-’ на 9 происходит без его перекоса й при сниженном трении со стороны торцовой поверхности, что обусловливается наличием выступов 11 и прорезей 40 10 на торцах клапана. Кроме того, такой устойчивый характер перемещения клцпана 9 обеспечивает более раннее и быстрое перекрытие впускного канала 18.Under the action of increasing air pressure from the side of the channel 17 and the leakage of network air through the slots 10 under the supporting side surface of the valve 9, the latter begins to move towards the channel 18 35 and blocks it. The movement of “put” by 9 occurs without its distortion and with reduced friction from the end surface, which is due to the presence of protrusions 11 and slots 40 10 at the ends of the valve. In addition, such a stable nature of the movement of the control panel 9 provides an earlier and faster overlap of the inlet channel 18.

Через открывшийся канал 17 по каналу 19 сжатый воздух из полости гнезда 8 начинает поступать в полость 5 холостого хода. Преодолевая противодавление со стороны полостй 5, ударник 2 наносит удар по инструменту 4 , после чего процесс повторяется с той лишь разницей, что в формировании силового импульса очередного хода участвует и импульс отскока.Through the opened channel 17 through the channel 19, compressed air from the cavity of the socket 8 begins to flow into the cavity 5 idle. Overcoming the backpressure from the side of the cavities 5, the striker 2 strikes the tool 4, after which the process is repeated with the only difference that the rebound impulse is also involved in the formation of the power pulse of the next stroke.

Предлагаемое техническое решение позволяет повысить надежность запуска и работы молотка, причем эта надежность дополнительно увеличивается практически во столько же раз, каково количество одноименных клапанов, задействовано в воздухораспределительном устройствб.The proposed technical solution improves the reliability of the launch and operation of the hammer, and this reliability additionally increases almost as many times as the number of valves of the same name is involved in the air distribution device.

Claims

The invention relates to mining and construction machines and can be used to create pneumatic machines of rotary percussion, rotary percussion and percussion actions, both manual and non-manual. The design of a pneumatic hammer containing a handle, an instrument, a housing with a hammer, and air distribution in the form of a tubular cylindrical valve placed in a valve box seat with side inlet and outlet air channels 1 is known. The disadvantages of this technical solution are the prevailing side friction friction the valve in the seat and the absence of air leakage sites, causing uneven abrasion of the valve side plate and its delay during movement, including the beginning and ec perekidki that disrupts the stable operation of the air distribution device and a pneumatic hammer in general. The closest to the technical essence and the achieved result to the proposed is the air distributing device of a pneumatic hammer, which includes an annular valve box with a limiting shell and a seat in which a cylindrical tubular valve is located, and air supply channels 2. The disadvantage of this device is the constant friction of the supporting face the surface of the cylindrical valve on the landing site sockets in the valve box, causing a delay in switching. In addition, the valve skewing in the axial direction leads to the deformation of the end edges of the valve from impacts (during its transfer) to the side surfaces of the valve box seat. After running in, the valve becomes barrel-shaped instead of cylindrical, which increases the involuntary leakage of compressed air through the gaps between the side surfaces of the valve and the seat in the valve. The purpose of the invention is to increase the reliability of the start and operation of the air-distributing device. The goal is achieved by the fact that radial slots are made at the ends of the tubular valve, with this axis of the valve and the valve box mutually perpendicular. In the valve box can be made several nests in which the tubular valves are located. FIG. 1 shows a pneumatic hammer with an air distribution device, a partial section; in fig. 2 - valve box, section along valve sockets. A pneumatic hammer contains a cylinder 1, a hammer 2, a handle 3 with a starting device (not shown) of any design, a working tool 4. A hammer 2 separates the central channel of cylinder 1 into cavities 5 and 6 of the idler and working strokes. At the end of cylinder 1, on the handle side, Z. is installed a ring valve box 7 with a socket 8 and a cylindrical tubular valve 9 in it. The ends of the valve 9 are provided with slots 10 and you are blunt 11. The use of several valves of the same name contributes to the stability of the launch and operation of the air distributor and the hammer as a whole. Outside the box 7 there is a fence 12, made in the form of a ring with windows 13 for keeping the valves 9 from falling out of the sockets 8 and passing air into the socket from the annular chamber 14, which communicates with the compressed air network through the channels in the cylinder 1 and the starting device the handle 3. The valve box 7 is pressed against the end face of cylinder 1 by a lid 15 with a chamber 16. The socket 8 of the box 7 is provided with channels 17 and 18 going to the ends of the box and 18, with a cavity cavity respectively with cavity 5 through channel 19 in the cylinder 1 and with the chamber 16 and polo Tew 6. The cylinder 1 is provided with an outlet channel 20 through which the cavity 5 and 6 are periodically communicate with the atmosphere and are emptied. Pneumatic hammer works as follows. When the handle 3 is pressed, a starting device (not shown) is turned on, and the compressed air from the network enters the annular chamber 14, and through the inlet ports 13 from the network enters the cavity of the socket 8 with the tubular valve 9. Depending on the position of the valves 9 and the hammer 2 the air from the socket 8 enters either through channel 18 into chamber 16 and cavity 6 (Fig. 2, left valve position), or through channel 17 and 19 into chamber 5 (Fig. 2, right valve position). According to the position of the hammer shown in FIG. 1, the compressed air from the port 8 flows through the channel 18 into the chamber 16 and the cavity 6, from where through the exhaust channel 20 to the atmosphere, and the pressure in the cavity of the nest 8 from the channel 18 side decreases. The air flowing through the slot 10 under the valve 9 increases the pressure on it from the side of the channel 17, and the valve moves towards the channel 18 and closes it. The slits 10 at the ends of the valve 9 allow for uniform leakage of the supply air at both ends, and the valve is thus kept in the socket cavity during its movement without tilting. This steady position of the valve is promoted by smaller frictional forces from the side of its end, which slides along the inner surface of the socket. Smaller friction forces are determined by the area of the projections 11, the smaller area of the solid end face by the size of the area of the slots 10.- In addition, the network air washing the valve 9 evenly from all sides, thanks to the slot 10, keeps it in a stable position both after detachment and during movement until landing. The absence of a skew of the valve 9 prevents its end cut-off edges and side surface from deformation. In this case, the curvature of the side surface of the valve does not occur and there are no gaps between the valve and the inner surface of the valve seat, which avoids involuntary leakage of compressed air from the network through the hammer. After shutting off the valve 9 of the channel 18, the air from the network stops flowing into the chamber 16 and the cavity 6, the pressure in which is set close to the atmospheric value. Thus, the network air from the chamber 14 through the window 13 enters the cavity of the socket 8, from where it is channeled through the channels 17 and 19 into the chamber 5, the pressure in which begins to rise. The difference in pressure forces on the ends of the striker 2 from the side of the cavities 5 and 6 causes its movement from the tool & idle done. Due to the accelerated movement of the striker 2, the pressure in the cavity 5, the channel 19 and under the valve 9 decreases markedly, and after the OPENING of the outlet port 20 decreases sharply to atmospheric. The air pressure on the valve 9 from the side of the channel 18 during this period increases due to the compression of the air cut off in the cavity 6 and the chamber 16, as well as the leakage of the network air under the valve due to slot 10. Under the action of the pressure differential, the valve 9 moves towards the channel 17, The air supply through channel 18 to chamber 16 and cavity 6 is removed, increasing the backpressure in the latter, which causes inhibition of the striker 2 at the end of idling. Valve 9, moving towards channel 17, with its end slides along the surface of the blind end of the socket 8. Since the area of the projections 11 from the end of the valve 9 is smaller than the area of the solid butt by the size of the area of the notches 10, the frictional forces cause the valve to skew. Moreover, the network air washing the valve 9 on all sides, thanks to the slits 10, keeps it in a stable position until it closes channel 17. After closing the valve 9 of channel 17, the flow of network air into the channel 19 and the chamber 5 stops. Continuing to idle, the striker 2 under the action of braking forces from the side of the cavity 6 and the chamber 16 stops and begins an accelerated motion to the tool 4, making a working stroke. With the accelerated movement of the striker 2 to the tool 4, the pressure in the cavity 6 and the chamber 16, as well as in the channel 18 gradually decreases, and after opening the exhaust channel 20 decreases to the atmospheric level. The pressure forces acting on the valve 9 from the side of the channel 18 are also significantly reduced. After the hammer 2 closes off the outlet channel 20 in the cavity 5, the compression of the free air cut there begins. Under the action of increasing air pressure from the channel 17 side and the flow of network air through the slots 10 under the supporting side surface of the valve 9, the latter begins to move towards the channel 18 and closes it. The movement of the put on 9 occurs without its skewing and with reduced friction from the end surface, which causes the presence of protrusions 11 and slots 10 at the valve ends. In addition, such a stable movement of the valve 9 provides for an earlier and faster closing of the inlet channel 18. Through the opened channel 17 through the channel 19, the compressed air from the cavity of the socket 8 begins to flow into the cavity 5 of idling. By overcoming the back pressure from cavity 5, darnik 2 strikes tool 4, after which the process is repeated with the only difference that the rebound impulse is involved in the formation of the force impulse of the next hoa. The proposed technical solution makes it possible to increase the reliability of starting and operating the hammer, and this reliability additionally increases almost as many times as the number of valves of the same name, which are used in the air distribution device. Claim 1. Air-distributing device of a pneumatic hammer, comprising an annular flared box with a restrictive shell and a socket in which a cylindrical tubular valve is located, and air supply channels, in which, d the purpose of improving the reliability of launching and operating the device is on the chords of the tubular valve. radial slots, with the axes of the valve and the valve box mutually perpendicular. 2. A device according to claim 1, characterized in that in the valve box there are several sockets in which tubular valves are located. Sources of information taken into account in the examination 1. German Patent I 217428, cl. 5 B 3/24, 1909.

2. The patent of Sweden 189338, cl. 87 В 2/05, 1964 (prototype).

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