KR101631205B1 - Soft seal sluice valve - Google Patents

Soft seal sluice valve Download PDF

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Publication number
KR101631205B1
KR101631205B1 KR1020160007494A KR20160007494A KR101631205B1 KR 101631205 B1 KR101631205 B1 KR 101631205B1 KR 1020160007494 A KR1020160007494 A KR 1020160007494A KR 20160007494 A KR20160007494 A KR 20160007494A KR 101631205 B1 KR101631205 B1 KR 101631205B1
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KR
South Korea
Prior art keywords
mcf
rubber sheet
coating layer
milled
carbon fiber
Prior art date
Application number
KR1020160007494A
Other languages
Korean (ko)
Inventor
구충호
신대하
장정연
김권일
Original Assignee
주식회사 동양밸브
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Priority to KR1020160007494A priority Critical patent/KR101631205B1/en
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Publication of KR101631205B1 publication Critical patent/KR101631205B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/0227—Packings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/0263—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor using particular material or covering means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/30—Details
    • F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)

Abstract

According to the present invention, a soft seal water control valve comprises: a body having a connection flow passage connecting each pipe; and a disk opening and closing the connection flow passage. Opening and closing of the connection flow passage are determined depending on a coupling state between a rubber sheet provided on the disk and a coating layer formed on the inner surface of the body, and at least one among the coating layer and the rubber sheet can contain the carbon fiber.

Description

SOFT SEAL SLUICE VALVE with carbon fiber

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a soft chamber water valve having improved airtightness using carbon fibers.

The soft room drain valve can be determined by the combination of the rubber sheet portion of the disk and the powder coating surface inside the valve body.

Frequent operation, foreign matter, fast flow rate, repetitive motion by water pressure, etc. can cause wear and damage of rubber sheet and coating surface.

Wear of rubber sheets and coating surfaces can cause valve leakage, which can shorten the life of the product and lead to excessive maintenance costs of the pipe, which can lead to loss of valuable water resources.

Korean Patent Registration No. 1356121 discloses a soft seal movable sweep valve which is easy to replace due to the repair of a sweep valve, but measures against wear of the rubber sheet and the coating surface are not shown.

Korean Patent Registration No. 1356121

The present invention is to provide a soft chamber water valve including carbon fibers for improving wear resistance.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

According to another aspect of the present invention, there is provided a soft seal water valve comprising: a body having a connection passage for connecting pipes; and a disk for opening and closing the connection passage, The opening and closing of the connecting passage is determined, and at least one of the coating layer and the rubber sheet may contain carbon fibers.

The coating layer includes an epoxy resin containing 2 to 6 wt% MCF (Milled Cabon Fiber), and the rubber sheet includes an ethylene propylene diene M-class (EPDM) containing 3 to 7 wt% MCF (Milled Cabon Fiber) .

The soft chamber valve of the present invention may contain a MCF (Milled Cabon Fiber) in a powder coating of a raw material of a coating layer (coating surface) on the inner surface of a valve body and a disc rubber sheet of a valve disc serving as an index.

Due to the inclusion of MCF (Milled Cabon Fiber), the tensile strength, hardness, abrasion resistance and impact resistance of the coating layer and the rubber sheet can be improved.

Improvement of the physical properties of the coating layer and the rubber sheet improves the exponential performance of the valve and ensures high durability and long life.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a soft chamber wastewater valve of the present invention. Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a soft chamber wastewater valve of the present invention. Fig. In Figure 1, a cross section of a soft chamber flush valve is posted.

1 may include a body 110 having a connecting oil channel for connecting the respective pipes 10, and a disk 130 for opening and closing the connecting oil channel.

At this time, opening and closing of the connection channel can be determined according to the coupling state of the coating layer 111 formed on the inner surface of the body 110 and the rubber sheet 131 provided on the disk 130.

Since the body 110 is formed of a metal generally corresponding to a rigid body, the connection channel corresponding to the through hole provided in the body 110 may be insufficient in airtightness.

The coating layer 111 may correspond to the coating surface of the powder coating painted on the inner surface of the body 110 to improve the airtightness of the connecting flow path.

The disk 130 can open or close the connection channel by linear motion or rotational motion.

During the closing operation of the disc 130, the exponential performance can be determined according to the airtightness between the connecting passage and the disc 130. The airtightness of the coupling channel can be improved by the coating layer 111 and the airtightness of the disc 130 can be determined according to the state of engagement of the entire disc 130 or the rubber sheet 131 covering the rim.

Since both the coating layer 111 and the rubber sheet 131 are made of a soft material as compared with the metal material constituting the body 110 or the disk 130, airtightness between the coating layer 111 and the rubber sheet 131 can be improved. On the other hand, it can be easily damaged compared with a metal material.

For example, the coating layer 111 or the rubber sheet 131 may be damaged by foreign matter such as sand, gravel, stones, etc., sludge remaining in the piping 10, or other solid matter that has solidified.

The fluid flowing through the piping 10 connected to the soft room drain valve may contain sand, gravel, stones, etc. that flow in the process of taking the raw water. These foreign substances move along the flow path of the fluid and can move to the position where the valve is closed or the discharge port (Ito). Foreign matter passing through the valve or placed in the valve may damage the rubber sheet 131 (rubber material) of the disc 130 or the coating layer 111 (paint) on the inner surface (inner surface) of the body 110 .

The rubber sheet 131 and the coating layer 111 are elements that are connected to the leakage immediately when they are damaged. Leakage of the valve at the end of the pipe (10) or located at the place where the shutoff is important can lead to serious problems such as massive loss of water resources and inundation accident.

In addition, the valve used in the sewage treatment plant, the sludge conveyance line installed in the sanitary, wastewater, livestock, and water treatment plant can be eroded or chemically deteriorated by the sludge by the coating layer 111 or the rubber sheet 131. As a result, the contact surface between the coating layer 111 and the rubber sheet 131 is burned, and leakage may occur due to burning of the contact portion.

In the event of a leak, including the above example, valve operators essentially open and close the valve again. Repeating the valve opening and closing operations to solve the leak can apply a torque much larger than the normal torque. Therefore, when foreign matters such as sand, gravel, and stones are present between the coating layer 111 and the rubber sheet 131 during repetition of the valve opening / closing operation, the damage of the coating layer 111 or the rubber sheet 131 may be further intensified have.

In the above example, the requirements for the soft room drain valve can be summarized as follows.

1. The index is executed by the combination of the coating layer 111 on the inner surface of the body 110 constituting the valve and the rubber sheet 131 of the disk 130. [

2. A technique is required to minimize the damage of the coating layer 111 and the rubber sheet 131 by foreign substances such as sand, gravel, and stones, and to maintain the exponential capacity of the valve.

3. A technique for improving the wear resistance or strength of the coating layer 111 is required to prevent the coating layer 111 from being damaged by foreign substances.

4. A technique for improving the abrasion resistance or strength of the rubber sheet 131 in order to prevent damage of the rubber sheet 131 due to a foreign substance is required.

The present invention may be to solve Problems 3 and 4 above.

Damage to the coating layer 111 or the rubber sheet 131 that provides airtightness means a decrease in airtightness, and the index performance may be rapidly deteriorated due to a decrease in airtightness.

Damage to the coating layer 111 or the rubber sheet 131 has a large effect on the life span.

In order to prevent the coating layer 111 or the rubber sheet 131 from being damaged, carbon fiber may be contained in at least one of the coating layer 111 and the rubber sheet 131.

The coating layer 111 may be formed by powder coating using heat (200 ° C to 230 ° C) using an epoxy resin powder coating material. In order to improve the strength of the coating layer 111, a paint excellent in shock and strength is required, and carbon fibers can be blended into the epoxy resin to satisfy the above requirements.

There is a problem that the carbon fibers are not uniformly distributed in the epoxy resin paint because of their strong aggregation properties. Experimental results show that MCF (Milled Cabon Fiber) with the size of several tens to several hundred ㎛ is the carbon fiber which has the least aggregation. Preferably, the size of the MCF is 60 to 100 mu m.

Since the MCF (Milled Cabon Fiber) has a size of 60 to 100 mu m, the dispersion of the MCF (Milled Cabon Fiber) is prevented.

MCF (Milled Cabon Fiber) does not change or deteriorate its property or performance in the process of manufacturing epoxy paint or powder coating process. This is because the carbon fiber is a material heat-treated at a temperature of 1,000 to 1,500 ° C, and thus can be safely maintained at a treatment temperature of 100 to 220 ° C or a coating temperature of a powder coating process. Therefore, the MCF (Milled Cabon Fiber) is sufficient for the appropriate process in the epoxy resin manufacturing process. At this time, the ratio of MCF (Milled Cabon Fiber) used is preferably 2 to 6 parts by weight (wt%) based on 100 parts by weight of the paint or coating layer 111.

As a result, the coating layer 111 of the present invention may include an epoxy resin containing 2 to 6 wt% MCF (Milled Cabon Fiber). The gastric coating layer 111 may be formed by electrostatically coating a mixture of epoxy resin and MCF (Milled Cabon Fiber) on the inner surface of the body 110 heated in advance.

The finished coating layer 111 can maintain grayscale, and some black dots can be seen due to MCF (Milled Cabon Fiber), but there is no problem with the performance of the product.

As a result of the experiment, the coating layer 111 of the present invention satisfied the quality of the paint and paint required by the KWWWA B 102 water softening slush valve standard proposed by the Korean Waterworks and Sewerage Association. In addition, it has been found that the abrasion resistance has an excellent effect.

Table 1 below shows the results of experiments on the abrasion resistance of the coating layer 111.

The reciprocating motion was performed in a state in which a needle having a predetermined pressure was applied in contact with the coating layer 111. The number of reciprocations until the coating layer 111 was broken due to abrasion was measured. The larger the number of reciprocations, the better the abrasion resistance.

Content of MCF (Milled Cabon Fiber) (wt%) Abrasion resistance 0 10 0.5 19 One 28 1.5 33 2 76 3 88 4 103 5 90 6 81 7 31 8 16 9 8

The pressure applied to the needle was set to a value at which the coating layer 111 formed of an epoxy resin containing no MCF (Milled Cabon Fiber) was broken by ten reciprocations.

Table 1 shows that the wear resistance is improved as the MCF (Milled Cabon Fiber) content is increased. Although the MCF (Milled Cabon Fiber) content was 0.5 wt%, 1 wt% and 1.5 wt%, the wear resistance was partially improved, but the wear resistance improved remarkably when the MCF (Milled Cabon Fiber) content was 2 ~ 6 wt%.

In particular, when the content of MCF (Milled Cabon Fiber) was 4 wt%, the wear resistance was improved by more than 10 times as compared with the comparative example in which no MCF (Milled Cabon Fiber) was contained.

On the other hand, when the content of MCF (Milled Cabon Fiber) exceeds 4 wt%, it is confirmed that the wear resistance is rather reduced. Especially, from 7wt%, endurance was dramatically deteriorated. As a result, when the content of the MCF (Milled Cabon Fiber) exceeds 6 wt%, the coating layer 111 is not cut by abrasion, but the coating layer 111 can not maintain its original shape and is broken or broken, It is understood that it is caused by the deformation.

Based on the above experimental results, it is judged that MCF (Milled Cabon Fiber) content is 2 ~ 6 wt%, which is the optimal selection range.

The rubber sheet 131 formed on the disc 130 may include EPDM (ethylene propylene diene M-class).

The first manufacturing process of the EPDM (ethylene propylene diene M-class) rubber sheet 131 is a descending process. Lowering of rubber can increase plasticity by putting EPDM (Ethylene propylene diene M-class), which is a raw material, on rollers. MCF (Milled Cabon Fiber) can be blended with EPDM (ethylene propylene diene M-class) to improve abrasion resistance of EPDM (ethylene propylene diene M-class). According to this, the rubber sheet 131 may include a combination of EPDM (ethylene propylene diene M-class) and MCF (Milled Cabon Fiber).

As a result of the test, it is preferable that 3 to 7 parts by weight (wt%) of MCF (Milled Cabon Fiber) is contained in 100 parts by weight of the rubber sheet 131.

After the descending process is completed, mixing, rolling, molding, vulcanization, compression, and finishing are performed. The heating temperature of the whole process is 130 to 150 ° C and the pressure is 150 to 200 kgf / cm 2 . This temperature and pressure do not affect the properties of MCF (Milled Cabon Fiber) at all. Therefore, it is sufficient that MCF (Milled Cabon Fiber) is blended in an appropriate process during the production or molding of EPDM (ethylene propylene diene M-class).

At this time, note that the initial hardness value of the raw material EPDM (ethylene propylene diene M-class). If the MCF (Milled Cabon Fiber) is mixed with the raw material, the characteristics of the rubber can be changed with the hardness higher than the initial hardness value according to the ratio. The tensile strength increases with the hardness and conversely the elongation can be lowered. Therefore, the initial hardness value of EPDM (ethylene propylene diene M-class) is preferably well selected.

In summary, the hardness value of the rubber sheet 131 varies depending on the blend ratio of EPDM (ethylene propylene diene M-class) and MDF, and the hardness value of EPDM (ethylene propylene diene M- Is set to be lower than the hardness value.

A combination of EPDM (Ethylene propylene diene M-class) and MCF (Milled Cabon Fiber) is put into a mold of the rubber sheet 131 and heated and lined. After the lining, the rubber sheet 131 can be completed through natural cooling, drying and desulfurization. 3 ~ 7wt% must be strictly observed because the characteristics of the product changes according to the ratio of MCF (Milled Cabon Fiber).

Table 2 below shows the test results of the abrasion resistance of the rubber sheet 131.

A needle applied with a set pressure was reciprocated in contact with the rubber sheet 131 in the same manner as the coating layer 111. The number of reciprocations until the coating layer 111 was broken due to abrasion was measured. The larger the number of reciprocations, the better the abrasion resistance.

Content of MCF (Milled Cabon Fiber) (wt%) Abrasion resistance 0 10 One 12 2 17 3 51 4 65 5 110 6 72 7 60 8 21 9 16

The pressure applied to the needle was set to a value at which the rubber sheet 131 formed only of EPDM (ethylene propylene diene M-class) not containing MCF (Milled Cabon Fiber) was broken by ten round trips.

As shown in Table 2, it can be seen that the abrasion resistance is improved as the MCF (Milled Cabon Fiber) content is increased. The abrasion resistance was remarkably improved when the content of MCF (Milled Cabon Fiber) was 3 ~ 7 wt%.

In particular, when the content of MCF (Milled Cabon Fiber) was 5 wt%, the wear resistance was improved by more than 10 times as compared with the comparative example in which the MCF (Milled Cabon Fiber) was not contained.

On the other hand, when the content of MCF (Milled Cabon Fiber) exceeds 5 wt%, it is confirmed that the wear resistance is rather reduced. Especially, from 8wt%, the maternal resistance was dramatically deteriorated. As a result, when the content of MCF (Milled Cabon Fiber) exceeds 8 wt%, it is understood that the rubber sheet 131 is not cut by abrasion but deformed without maintaining the original property of the rubber sheet 131.

Based on the above experimental results, it can be judged that the MCF (Milled Cabon Fiber) content is 3 to 7 wt%, which is the optimum selection range.

On the other hand, depending on the valve size, it is better to vary the mixing ratio to 3 wt% for small size, 3 to 5 wt% for medium type, and 5 to 7 wt% for large size. This is because of dispersion of MCF (Milled Cabon Fiber).

As a result, unlike the case of applying to the coating layer 111, MCF (Milled Cabon Fiber) tends to aggregate regardless of dispersion. At this time, the value for reducing the loss rate and improving the dispersion to the maximum is the above value.

As can be seen from the above Tables 1 and 2, the coating layer 111 and the rubber sheet 131 suitably containing carbon fibers can be improved in abrasion resistance up to 10 times or more as compared with the comparative example in which carbon fibers are not contained have.

In addition, other physical and chemical performances were found to meet all the requirements of the KWWA B 102 Water Soft Slush Valve Standard.

The carbon fiber blended with the coating layer 111 or the carbon fiber has a large elastic modulus and strength and a small thermal expansion coefficient. There are also vibration damping properties, biocompatibility, and creep resistance. Also, it has advantages of fatigue, corrosion, friction, wear characteristics and chemical stability. MCF (Milled Cabon Fiber) is heat treated in the initial production process, and properties should be determined at this time. The nature of the MCF (Milled Cabon Fiber) can vary depending on how 'sizing' is done.

For example, it is preferable to judge whether the carbon fiber is thermosetting-friendly or thermoplastic-friendly and suitably treated.

The soft seal valve of the present invention described above may include a coating layer 111 or a rubber sheet 131 containing carbon fibers. Abrasion resistance and the like can be remarkably improved due to the combination of carbon fibers. Due to the excellent abrasion resistance, damage of the coating layer 111 or the rubber sheet 131 due to various foreign substances can be prevented. Therefore, according to the present invention, it is possible to provide a soft chamber valve which hardly deteriorates in index performance even when used for a long period of time.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

10 ... piping 110 ... torso
111 ... Coating layer 130 ... Disk
131 ... rubber sheet

Claims (7)

A body having a connection passage for connecting the respective pipes;
A disk for opening / closing the connecting passage by linear motion or rotational motion;
A coating layer formed on an inner surface of the body;
And a rubber sheet provided on the disc and covering the whole of the disc or the rim of the disc,
The opening and closing of the connection passage is determined according to a coupling state between the coating layer and the rubber sheet,
The rubber sheet is made of a soft seal valve containing EPDM (ethylene propylene diene M-class) containing 3 to 7 wt% MCF (milled carbon fiber) of 60 to 100 μm.
The method according to claim 1,
Wherein the coating layer comprises an epoxy resin containing 2 to 6 wt% MCF (Milled Carbon Fiber) of 60 to 100 탆.
delete The method according to claim 1,
Wherein the coating layer comprises an epoxy resin, a MCF (Milled Carbon Fiber) of 60 to 100 탆, and a dispersion inducing agent to prevent aggregation of MCF (Milled Carbon Fiber).
The method according to claim 1,
Wherein the coating layer is formed by electrostatically coating an inner surface of the body to which an MCF (Milled Carbon Fiber) blended with an epoxy resin in an amount of 60 to 100 mu m is electrostatically coated.
delete The method according to claim 1,
The rubber sheet comprises a combination of EPDM (ethylene propylene diene M-class) and MCF (Milled Carbon Fiber)
The hardness value of the rubber sheet varies depending on the mixing ratio of the ethylene propylene diene M-class (EPDM) and the MCF (Milled Carbon Fiber)
Wherein the hardness value of the EPDM (ethylene propylene diene M-class) is set to be lower than the hardness value of the rubber sheet.
KR1020160007494A 2016-01-21 2016-01-21 Soft seal sluice valve KR101631205B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005114140A (en) * 2003-10-10 2005-04-28 Asahi Organic Chem Ind Co Ltd Resin member for valve
KR101356121B1 (en) 2013-06-18 2014-01-29 (주) 삼진정밀 Water valve for operation
KR101401093B1 (en) * 2013-04-22 2014-05-28 오씨아이 주식회사 Carbon fiber bead insulator and preparation method thereof
JP2015090183A (en) * 2013-11-06 2015-05-11 株式会社清水鐵工所 Soft sealing gate valve

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005114140A (en) * 2003-10-10 2005-04-28 Asahi Organic Chem Ind Co Ltd Resin member for valve
KR101401093B1 (en) * 2013-04-22 2014-05-28 오씨아이 주식회사 Carbon fiber bead insulator and preparation method thereof
KR101356121B1 (en) 2013-06-18 2014-01-29 (주) 삼진정밀 Water valve for operation
JP2015090183A (en) * 2013-11-06 2015-05-11 株式会社清水鐵工所 Soft sealing gate valve

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