KR20210135824A - Pneumatic filter directional change valve - Google Patents

Abstract

According to the present invention, provided is a pneumatic filter direction switching valve capable of having a dual filter channel formed therein, in which two pneumatic filters are parallelly placed. According to the present invention, when the pneumatic filter direction switching valve of the present invention is installed on an air pipe, one of the two pneumatic filters placed in two directions can be replaced without a separate bypass pipe, and also, an air flow and a filtering function can become seamless, and therefore, purified air can be supplied all the time. Since purified compressed air can be supplied even with a pneumatic filter, the pneumatic filter direction switching valve can be used as an essential component to improve the performance of a selective catalytic reduction (SCR) system for purifying exhaust gas produced from various apparatuses or facilities using a high-temperature combustion reaction, and can be effectively applied to selective catalytic reduction (SCR) systems of a vessel engine and an industrial site to make a contribution to the prevention of environmental pollution.

Description

Pneumatic filter directional change valve

The present invention is to provide a pneumatic filter directional switching valve having two pneumatic filters arranged in parallel and having a double filter channel disposed therein. It becomes possible to replace any one of the two pneumatic filters arranged in both directions without the need for a pneumatic filter replacement, and the air flow and filtering functions are seamlessly performed, so that purified air can be always supplied. As such, since purified compressed air can be supplied even when the material of the pneumatic filter is used, the pneumatic filter directional valve according to the present invention is SCR (Selective Catalytic Reduction) for purifying exhaust gas generated from various devices or facilities using a high-temperature combustion reaction. , selective catalytic reduction) can be used as an essential component to improve system performance, and it can be effectively applied to SCR (Selective Catalytic Reduction) systems of industrial sites and marine engines to contribute to environmental pollution prevention.

Vehicles equipped with engines that use fossil fuels, ships or industrial sites that use engines equipped with engines emit large amounts of air pollutants such as nitrogen oxides (NOx), which are the main culprits of environmental pollution and climate change. , an exhaust gas reduction device to improve this needs to be installed in conjunction with the engine, and the SCR system, which is a kind of exhaust gas reduction device, mainly processes nitrogen compounds by applying a selective catalyst reduction technology.

The Urea injection system, which is a major part of the SCR system, converts nitrogen oxides into nitrogen and water vapor by mixing and spraying purified compressed air and ammonia in an appropriate ratio. Here, the pneumatic filter is to supply compressed air purified from the SCR system to the Urea injection system, and is recognized as a key part of the SCR system applied to prevent environmental pollution caused by nitrogen oxides generated in vehicles/ships/industrial sites, etc. is becoming Currently, pneumatic filters of various structures have been developed and used at home and abroad, but they are often operated in harsh environmental sources caused by vibration or movement, so they need to have excellent durability. Pneumatic filters suitable for these conditions have been put to practical use by Korea, the United States, and Germany, and are being applied to SCR systems in industrial fields.

However, when the pneumatic filter is located in the conventional SCR system, the flow of compressed air is diverted, and the unpurified compressed air is supplied to the Urea injection system, causing deterioration in the performance of the SCR system due to nozzle clogging, etc., as shown in FIG. 1 . As a separate bypass pipe for diverting the air flow needs to be installed, the structure becomes complicated and fluid flowability is deteriorated.

In order to solve these problems, it is necessary to remove the separate bypass pipes from the system and provide a pneumatic filter directional valve with a structure in which a plurality of pneumatic filters are arranged in parallel and an intuitive structure equipped with a fluid direction change/flow control function. have. Such a pneumatic filter directional switching valve needs to have a flow structure that selectively switches the flow direction of compressed air while overcoming the pressure of the supplied compressed air, and minimizes pressure drop. In the case of a pneumatic filter applied to this, it is necessary to secure durability against a harsh environment, and since the replacement frequency may be higher than other components, it is necessary to develop a structure in which only the pneumatic filter can be easily replaced.

Meanwhile, as the technology related to the exhaust gas reduction device, Republic of Korea Patent Publication No. 10-1461875 'Exhaust purifier', Registration No. 10-2079540 'Solid urea-based ammonia reducing agent supply system for selective reduction catalyst denitrification facility' and its operation method' have been devised.

Such a conventional exhaust gas reduction device fundamentally prevents external leakage of ammonia gas by sequentially connecting an SCR device, a diesel oxidation catalyst (DOC), and a diesel particulate matter filter (DPF) on an exhaust pipe, If there is a problem, it is impossible to control the unpurified gas at the source, so there is a limit that the performance of the device is deteriorated.

Republic of Korea Patent Publication No. 10-1461875 'Exhaust purifier' Republic of Korea Patent Publication No. 10-2079540 'Solid urea-based ammonia reducing agent supply system and operating method for selective reduction catalyst denitrification facility'

Therefore, the present invention improves the problems of the prior art, so that the first filter channel and the second filter channel are formed separately inside the housing to bypass the flow of exhaust gas and compressed air when a problem with the pneumatic filter and piping occurs. An object of the present invention is to provide a pneumatic filter directional switching valve that does not need to be coupled with a separate bypass pipe.

And an object of the present invention is to provide a pneumatic filter directional switching valve that includes a first direction switching port and a second direction switching port to control the flow of exhaust gas by allowing air to flow into only one filter channel.

In addition, the first pneumatic filter and the second pneumatic filter are arranged at a set angle and arranged together with a spring, so that the fixed position inside the housing and the separation work to the outside of the housing can be performed simply and easily. aims to provide

According to a feature of the present invention for achieving the above object, the present invention is connected to the air pipe 1, the air inlet 110 and the air outlet 120 are formed at both ends in the longitudinal direction, and the air inlet 110 ) and a housing 100 in which the first filter channel 130a and the second filter channel 130b connected to the air outlet 120 are separately formed therein; a first pneumatic filter (200a) disposed in the first filter channel (130a) of the housing (100); a second pneumatic filter 200b disposed in the second filter channel 130b of the housing 100; The first is disposed in the air inlet channel 140a communicating with the air inlet 110 of the housing 100 so that the air moves only to one selected from the first filter channel 130a and the second filter channel 130b. direction turning hole (300a); The air outlet 120 is disposed in the air outlet channel 140b communicating with the air outlet 120 of the housing 100 and the air passing through the first filter channel 130a does not flow into the second filter channel 130b. ), or a second direction switching port (300b) for allowing the air that has passed through the second filter channel (130b) to be discharged to the air outlet (120) without being introduced into the first filter channel (130a); It provides a pneumatic filter directional switching valve, characterized in that it consists of a configuration comprising a.

In such a pneumatic filter directional switching valve according to the present invention, the first direction bulb (300a) and the second direction switching port (300b) are made in a spherical shape, and the first passageway (321a) and the second passageway are arranged at right angles. (321b) is formed in the lateral direction, the handle fixing groove 322 is formed in the upper central portion of the ball 310; a handle 350 connected to the top of the ball 320 and protruding out of the housing 100 to rotate the ball 320 by a user operation; It may be a manually operated valve body of a configuration comprising a.

The first filter channel 130a and the second filter channel 130b are formed between the air inlet channel 140a and the first pneumatic filter 200a and between the air inlet channel 140a and the second pneumatic filter ( 200b) respectively disposed between the inlet channel units (131a, 131b) having a circumference smaller than the inlet of the first pneumatic filter (200a) and the second pneumatic filter (200b); are respectively disposed between the first pneumatic filter 200a and the air discharge channel 140b and between the second pneumatic filter 200b and the air discharge channel 140b, the first pneumatic filter 200a and the air discharge channel 140b The outlet channel unit (132a, 132b) having a smaller circumference than the inlet of the second pneumatic filter (200b); It may be of a configuration comprising a.

The pneumatic filter directional valve according to the present invention as described above sequentially arranges the disk 310, the ball 320, and the ball cap 330 so that the ball 320 is positioned without flow, but the disk 310. is provided between the second filter channel 130b and the ball 320 so that the ball 320 can be fixedly operated, and the ball cap 330 is provided between the ball 320 and the first filter channel. It may be provided between (130a).

The first direction turning hole (300a) and the second direction turning hole (300b) is provided on the ball 320, the handle plate 360 is formed on the upper surface of the number engraving is disposed at right angles; With the handle 350 passing through the handle plate 360 and disposed on the upper side of the handle plate 30, the handle of the first direction turning hole 300a and the second direction turning hole 300b 350 can be manually oriented to be located on the same numbered engraving.

The first pneumatic filter (200a), the second pneumatic filter (200b) is made of a stainless steel material, the upper surface is opened in a cylindrical shape, the circumferential surface and the bottom surface of the filter case 210 made of a mesh structure; a first spring 220 surrounding the outer circumferential surface of the filter case 210; a filtering net 230 made of a polyethylene material and inserted into the filter case 210 in a cylindrical shape; a spring cap 240 provided on an upper surface of the filter case 210; a second spring 250 provided on the spring cap 240; a fixing cap 260 provided on the second spring to be fixed to the housing 100; It may be of a configuration comprising a.

According to the pneumatic filter directional switching valve according to the present invention, the following effects can be obtained.

First, there is no need to provide a separate pipe (bypass pipe, etc.), so there is no additional trouble for the user and it is economical. Second, it overcomes the pressure of the supplied exhaust gas and compressed air and prevents the bypass of the compressed air, thereby reducing the risk of damage to the device and gas leakage. Third, it is easy to separate the filter, so that the working time can be shortened.

In addition, through the domestic development of the pneumatic filter directional valve of the present invention, it is possible to increase the market dominance in the domestic and foreign SCR system parts field and improve the capabilities of small and medium-sized enterprises, and to increase added value by applying it to the SCR system of a ship. have. And by gradually expanding its application to the environmental industry, it can contribute to preventing environmental pollution caused by nitrogen oxides generated in industrial sites and ships.

1 is a view for showing a filter valve and a pipe structure of a conventional SCR system;
2 is a configuration diagram of a pneumatic filter directional switching valve according to an embodiment of the present invention;
3 is an exploded view of a pneumatic filter directional switching valve according to an embodiment of the present invention;
4 is a configuration diagram of a first pneumatic filter and a second pneumatic filter according to an embodiment of the present invention;
5 is a diagram illustrating a first filter channel and a second filter channel according to an embodiment of the present invention;
6 is a view for showing the configuration of a ball according to an embodiment of the present invention;
7 is a view for showing the configuration of a handle according to an embodiment of the present invention;

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings 2 to 7 . On the other hand, in the drawings and detailed description, the illustration and reference of the configuration and action that can be easily recognized by those skilled in the art from the general valves, pipes, etc. are simplified or omitted. In particular, in the drawings and detailed descriptions, detailed descriptions and illustrations of specific technical configurations and actions of elements not directly related to the technical features of the present invention are omitted, and only the technical configurations related to the present invention are briefly illustrated or described. did.

The pneumatic filter direction switching valve according to an embodiment of the present invention is a housing 100, a first pneumatic filter 200a, a second pneumatic filter 200b, a first direction switching port 300a, as shown in FIGS. 2 and 3 . , to overcome the pressure of the supplied compressed air provided with a second direction change port (300b) and to change the direction.

The housing 100, as shown in FIG. 2, is to which the components of the pneumatic filter directional switching valve are arranged and fixed, and is made of a single block body shape, the first pneumatic filter 200a, the second pneumatic filter 200b, the second A space in which the first direction turning hole 300a and the second direction turning hole 300b are inserted and fixed is formed concavely from the upper surface and the side surface. The pneumatic filter directional control valve is made up of a unit block body and can be used interchangeably in various pipes. The housing 100 is connected to the air pipe 1 so that compressed air is introduced and filtered and purified compressed air is discharged. At both ends of the housing 100 in the longitudinal direction, an air inlet 110 and air outlet ( 120) is formed. In addition, the first filter channel 130a and the second filter channel 130b are formed separately in the housing 100 while being connected to the air inlet 110 and the air outlet 120 . The excitation first filter channel 130a and the second filter channel 130b are arranged in parallel.

The first pneumatic filter 200a performs a filter function of removing fine foreign substances mixed in the exhaust gas. It is disposed on the first filter channel 130a of the housing 100, and is inclined at a set angle to be seated.

Like the first pneumatic filter 200a, the second pneumatic filter 200b performs a filter function of removing fine foreign substances mixed in the exhaust gas. It is disposed on the second filter channel 130b of the housing 100, and is inclined at a set angle to be seated.

The first pneumatic filter 200a and the second pneumatic filter 200b are the filter case 210, the first spring 220, the filtering net 230, the spring cap 240, and the second spring 250, as shown in FIG. ), and is made of a configuration including a fixing cap 260, through which the housing 100 is separately separable from the outside.

The filter case 210 corresponds to a central body portion from which foreign matter is removed. It is made of a stainless steel material with strong corrosion resistance and has an open top surface in a cylindrical shape. The circumferential surface and the bottom surface are made of a mesh network structure and are inclined at a set angle to be seated inside the housing 100 . In addition to stainless steel, other materials with strong corrosion resistance can be used.

The first spring 220 may be easily separated when the first pneumatic filter 200a and the second pneumatic filter 200b are separated from the outside of the housing 100 based on the elastic force of the spring. It has a larger circumference than the circumference of the filter case 210 and is disposed to surround the outer circumferential surface of the filter case 210 . Through this, the external separation of the first pneumatic filter 200a and the second pneumatic filter 200b is easily performed while the elastic force is applied to the filter case 210 in the outward direction.

The filtering net 230 is made of a polyethylene material and performs a filtering function. In order to be inserted and seated inside the filter case 210, it is manufactured in a cylindrical shape similar to the filter case 210, which may be changed according to circumstances. The material can also be changed to a lightweight material similar to polyethylene.

The spring cap 240 is fitted to the filter case 210 from the top surface of the filter case 210 . It is a circular cap with a circular hole in the middle, and three fixing protrusions formed in the opposite direction of the filter case 210 are spaced apart around the circular hole.

The second spring 250 is fitted and fixed to three fixing protrusions formed on the spring cap 240 , and when the fixing cap 260 is fixedly coupled to the housing 100 , the spring cap 240 and the filter case 210 . to give an elastic force in the inward direction. Through this, the first pneumatic filter 200a and the second pneumatic filter 200b are firmly fixed to the inside of the housing 100 without movement.

The fixing cap 260 is provided on the second spring 250 to be fixedly coupled to the housing 100 , and the fixing cap 260 and the housing 100 are screwed to form a bolt-nut coupling structure. to have a detachable structure.

The first filter channel 130a is a channel through which exhaust gas discharged from the engine enters through the air inlet 110 and is filtered. In the first filter channel 130a, as in FIGS. 2 and 5, the inlet channel units 131a and 131b, the first pneumatic filter 200a, and the outlet channel units 132a and 132b are sequentially arranged.

The inlet channel unit 131a is a passage through which the exhaust gas before being filtered flows, and is disposed between the air inlet channel 140a and the first pneumatic filter 200a. The inlet channel unit (131a) has a smaller circumference than the inlet circumference of the first pneumatic filter (200a).

The outlet channel unit 132a is a passage through which the filtered air flows, and is disposed between the first pneumatic filter 200a and the air discharge channel 140b. The outlet channel unit (132a) also has a smaller circumference than the inlet circumference of the first pneumatic filter (200a).

The second filter channel 130b is a channel through which exhaust gas discharged from the engine enters through the air inlet 110 and is filtered when the passage of the first filter channel 130a is blocked. Like the first filter channel 130a, the second filter channel 130b includes inlet channel units 131a and 131b, a first pneumatic filter 200a, and outlet channel units 132a and 132b sequentially.

The inlet channel unit 131b is a passage through which the exhaust gas before being filtered flows, and is disposed between the air inlet channel 140a and the first pneumatic filter 200a. The inlet channel unit 131b has a smaller circumference than the inlet circumference of the first pneumatic filter 200a. The inlet channel unit 131b toward the air inlet 110 is sealed so that the inlet channel cap 1310b is fitted to prevent gas from leaking to the outside.

The outlet channel unit 132b is a passage through which the filtered air flows, and is disposed between the first pneumatic filter 200a and the air discharge channel 140b. The outlet channel unit (132b) also has a smaller circumference than the inlet circumference of the first pneumatic filter (200a).

As described above, the first filter channel 130a having inlet channel units 131a and 131b and outlet channel units 132a and 132b having a smaller circumference than the inlet of the first pneumatic filter 200a and the second pneumatic filter 200b. ) and the second filter channel 130b, since the filtering area is formed to be larger than the inlet/outlet area, it is possible to increase the filtering effect.

The first direction switching port (300a) is a switching port serving as a direction change for controlling the flow of compressed air. It is disposed in the air inlet channel 140a communicating with the air inlet 110 of the housing 100 to change the direction so that the air moves only to one of the first filter channel 130a and the second filter channel 130b. is granted

The second direction turning hole (300b) is a turning hole serving as a direction change for controlling the flow of compressed air like the first direction turning hole (300a). It is disposed in the air outlet channel (140b) communicating with the air outlet (120) of the housing (100). The air that has passed through the first filter channel 130a is discharged to the air outlet 120 without being introduced into the second filter channel 130b, or the air that has passed through the second filter channel 130b is discharged into the first filter channel ( 130a) to be discharged through the air outlet 120 .

For this, the first direction turning hole (300a) and the second direction turning hole (300b) according to the embodiment of the present invention for this purpose are a ball 320, a disk 310, a ball cap 330, a handle 350, a handle plate ( 360) is included.

The ball 320 is made in a spherical shape as shown in FIG. 6 and is rotated as much as a right angle direction. A first passage 321a and a second passage 321b disposed at right angles to the rotation direction are formed in the lateral direction, and a handle fixing groove 322 is formed in the upper central portion.

The disk 310 is provided between the second filter channel 130b and the ball 320 and is installed to fix the ball 320 . As a device for maintaining the position of the ball 320 by internal pressure, the first direction turning hole 300a and the second turning hole 300b by the disk 310 can be applied to both horizontal and vertical pipelines .

The ball cap 330 is provided between the ball 320 and the first filter channel 130a. A plurality of through-holes 331 are formed to be spaced apart along the central circumferential surface, an inlet channel cap 1310a for sealing is fitted in one through-hole 331, and a first filter channel 130a is inserted in the other through-hole 331. make it fit

The disk 310, the ball 320, and the ball cap 330 are sequentially arranged so that the ball 320 can be rotated in place without flow.

The handle 350 is an interlocking means to rotate the ball 320 by a user operation. It is connected to the top of the ball 320 and protrudes out of the housing 100 . The handle 350 includes a direction change handle 351 and a handle pin 352 as shown in FIG. 7 .

The direction changing handle 351 is formed as a handle extending from the fan-shaped plate, so that the user can change the direction by holding the handle. The fan-shaped plate is provided with a direction confirmation groove 351b created on the upper side to check direction information and a first handle pin groove 351a created on the lower side so that the handle pin 352 passes through.

The handle pin 352 is a member that connects the ball 320 and the handle 350 to transmit direction change. The lower end of the handle pin 352 is fitted and fixed to the handle fixing groove 322 of the ball 320 as shown in FIG. 6 , the handle plate 360 is fitted thereon, and the direction changing handle 351 is fitted at the upper end. In accordance with the direction change of the direction change handle 351, the direction of the ball 320 is changed at the same time.

The handle plate 360 is provided on the upper side of the ball 320 so as to immediately identify the direction of the direction change handle 351 . The handle plate 360 is formed on the upper surface of the number engraving such as 1 and 2 disposed at right angles as in FIG. A second handle pin groove 361a is provided at the center so that the handle pin 352 passes therethrough, and is disposed in contact with the first handle pin groove 351a. The handle 350 passes through the handle plate 360 and is disposed on the upper side of the handle plate 30, and the handle 350 of the first turning hole 300a and the second turning hole 300b is the same number engraved. manually oriented to position. Through this, it is possible to implement a fail-safe function that prevents errors when replacing/cleaning the pneumatic filter by the operator and can continue operation.

When the replacement and repair of the first filter channel 130a or the first pneumatic filter 200a is in progress and the second pneumatic filter 200b needs to be used, the pneumatic filter directional valve according to the embodiment of the present invention, the first pneumatic The exhaust gas is prevented from flowing into or backflowing into the first filter channel 130a on the filter side. As shown in FIG. 2 , when the direction changing handle 351 faces the forward direction and the engraved number 1 of the handle plate 360 is visible, the first passage 321a of the ball 320 is interlocked with the second filter channel 130b and , the first filter channel 130a is blocked. Therefore, the exhaust gas is introduced only into the second filter channel 130b so that the purified compressed air is efficiently supplied.

In the pneumatic filter directional valve according to an embodiment of the present invention, when replacement and repair of the second filter channel 130b or the second pneumatic filter 200b is in progress and the first pneumatic filter 200a is used, the second pneumatic filter The exhaust gas is prevented from flowing into or backflowing into the second filter channel 130b of the direction. When the direction changing handle 351 is rotated at right angles from the forward direction to the clockwise direction to see the engraved number 2 of the handle plate 360, the first passage 321a of the ball 320 is interlocked with the first filter channel 130a and , the second filter channel 130b is blocked. Therefore, the exhaust gas is introduced only into the first filter channel 130a so that the purified compressed air is efficiently supplied.

As described above, although the pneumatic filter directional valve according to the embodiment of the present invention has been shown according to the above description and drawings, this is merely an example and various changes and changes within the scope not departing from the technical spirit of the present invention It will be appreciated by those skilled in the art that modifications are possible.

1: air piping
100: housing
110: air inlet
120: air outlet
130a: first filter channel
130b: second filter channel
131a, 131b: inlet channel unit
1310a, 1310b: inlet channel cap
132a, 132b: outlet channel unit
140a: air inlet channel
140b: air exhaust channel
200a: first pneumatic filter
200b: second pneumatic filter
210: filter case
220: first spring
230: filter net
240: spring cap
250: second spring
260: fixed cap
300a: first turning hole
300b: second turning hole
310: disk
320: ball
321a: first passage
321b: second passage
322: handle fixing groove
330: ball cap
331: through hole
350: handle
351: direction change handle
351a: first handle pin groove
352b: direction confirmation groove
352: handle pin
360: handle plate
361a: handle pin groove

Claims (5)

A first filter channel 130a connected to the air pipe 1, an air inlet 110 and an air outlet 120 are formed at both ends in the longitudinal direction, and connected to the air inlet 110 and the air outlet 120. and a housing 100 in which the second filter channel 130b is formed separately;
a first pneumatic filter (200a) disposed in the first filter channel (130a) of the housing (100);
a second pneumatic filter 200b disposed in the second filter channel 130b of the housing 100;
The first is disposed in the air inlet channel 140a communicating with the air inlet 110 of the housing 100 so that air moves only to one selected from the first filter channel 130a and the second filter channel 130b. direction turning hole (300a);
The air outlet 120 is disposed in the air outlet channel 140b communicating with the air outlet 120 of the housing 100 and the air passing through the first filter channel 130a does not flow into the second filter channel 130b. ), or a second direction switching port (300b) for allowing the air that has passed through the second filter channel (130b) to be discharged to the air outlet (120) without being introduced into the first filter channel (130a);
A pneumatic filter directional switching valve, characterized in that it consists of a configuration comprising a. The method of claim 1,
The first direction turning hole (300a) and the second direction turning hole (300b) is,
a ball 310 having a spherical shape, a first passage 321a and a second passage 321b disposed at right angles are formed in the lateral direction, and a handle fixing groove 322 is formed in the upper central portion;
a handle 350 connected to the top of the ball 320 and protruding out of the housing 100 to rotate the ball 320 by a user operation;
A pneumatic filter directional valve, characterized in that it is a manually operated valve chain of a configuration comprising a. The method of claim 1,
The first filter channel 130a and the second filter channel 130b are,
are respectively disposed between the air inlet channel 140a and the first pneumatic filter 200a and between the air inlet channel 140a and the second pneumatic filter 200b, the first pneumatic filter 200a and the Inlet channel units (131a, 131b) having a smaller circumference than the inlet of the second pneumatic filter (200b);
are respectively disposed between the first pneumatic filter 200a and the air discharge channel 140b and between the second pneumatic filter 200b and the air discharge channel 140b, the first pneumatic filter 200a and the The outlet channel unit (132a, 132b) having a smaller circumference than the inlet of the second pneumatic filter (200b);
A pneumatic filter directional switching valve, characterized in that it consists of a configuration comprising a. 3. The method of claim 2,
The disk 310, the ball 320, and the ball cap 330 are sequentially arranged so that the ball 320 is positioned without flow,
The disk 310 is provided between the second filter channel 130b and the ball 320 so that the ball 320 is fixed to operate,
The ball cap 330 is provided between the ball 320 and the first filter channel 130a,
The first direction turning hole (300a) and the second direction turning hole (300b) is,
a handle plate 360 provided on the ball 320 and having a number engraving disposed at a right angle formed on the upper surface; With the handle 350 passing through the handle plate 360 and being disposed on the upper side of the handle plate 30, the handle of the first direction changing port 300a and the second direction changing port 300b (350) is a pneumatic filter directional valve, characterized in that the manual direction control to be located in the same number engraved. The method of claim 1,
The first pneumatic filter (200a), the second pneumatic filter (200b) is,
a filter case 210 made of a stainless steel material, having an open top surface in a cylindrical shape, and a circumferential surface and a bottom surface having a mesh structure;
a first spring 220 surrounding the outer circumferential surface of the filter case 210;
a filtering net 230 made of a polyethylene material and inserted into the filter case 210 in a cylindrical shape;
a spring cap 240 provided on an upper surface of the filter case 210;
a second spring 250 provided on the spring cap 240;
a fixing cap 260 provided on the second spring to be fixed to the housing 100;
A pneumatic filter directional valve, characterized in that it comprises a.

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