JPH06341558A - Drain plug - Google Patents

Abstract

PURPOSE:To provide a drain plug which has a double structure to lead a fluid such as a gas to a safe place through a hose and the like without leaking to the outer side, and to discharge there, and can carry out the detection of a leakage and an emergent dealing instantly when it is used for detecting a leakage. CONSTITUTION:Opposing to an inlet side passage 2d of an angle form body 2, a main needle valve 3 provided with the locking by a bolt with head 8, and the shaft sealing by an O-ring 7 is provided. An auxiliary needle valve 5 which has a hole 6a for exhaust to a coupling 6 is provided at the outlet 2c of a body 2, the form of the outer end of the coupling 6 is made in a connection 6a to connect a hose and the like, and the coupling screw 2d for the auxiliary needle valve 5 is made in a screw suitable to screw in a connecting member to connect a sealing agent pouring device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drain plug used by being connected to a body of a ball valve, a gate valve or other valves.

[0002]

2. Description of the Related Art This kind of drain plug is not always used, but is used for maintenance and inspection, extension work, or for safely discharging fluid such as gas in the body cavity of a valve. This prior art example is shown in FIG. In the figure, the male thread 41a of the body 41 is a threaded portion to be screwed into a valve body or the like.
The inlet flow path 41b provided in No. 1 is closed by a needle 42, and the needle 42 is held in the body 41 by a set screw 43. In this state, the sealing state of the needle 42 is bad and the fluid in the flow channel 41b is
Even if it leaks to c, it is sealed by an O-ring 45 mounted between the body 41 and the cap 44, and does not leak to the outside.

When the drain is discharged, the cap 44
Apply a wrench to the wrench hook 44a on the head of the head to rotate it, pull out the cap 44 to the left in the drawing, and remove the needle 42
A spanner is hung on the spanner hook 42a and rotated to loosen the needle 42 to discharge the internal fluid from the flow path 41c to the outside. At this time, the needle 42 is opened carelessly, and the open position of the needle 42 is determined by the set screw 43 so that the needle 42 does not pop out.

Due to such a structure, it is not possible to connect a hose or the like in order to discharge the internal fluid to a safe place, and even if the hose or the like can be replaced with a connectable cap, the needle Since the seal is only 42, the cap cannot be replaced when the seal is leaking, which is extremely dangerous in the case of flammable gas or toxic gas. In addition, depending on the installation location, you may want to inject the sealant for emergency from these drain plugs, but with the conventional drain plug, it is impossible to inject the sealant from the plug itself. Is.

[0005]

SUMMARY OF THE INVENTION The present invention has been developed in view of the above-mentioned conventional problems, and enables connection of a discharge hose and the like, and further prevents leakage from the shaft of the needle valve and the discharge portion. It is an object of the present invention to provide a drain plug which has a double seal for sure prevention and can be filled with an emergency sealant.

[0006]

In order to achieve the above-mentioned object, the present invention forms a body of a plug body into an angled shape, and provides a main needle valve facing the inlet of the angled body. The drain plug is configured such that a lock bolt for locking the needle valve is screwed to the body, and a sub-needle valve having a hole provided at the shaft center of the joint as an outlet is provided at the outlet of the angled body.

This lock bolt is a bolt with a head and is screwed in parallel to the body along the stem so that the head locks the upper and lower flange portions provided on the stem of the main needle valve. . In addition, install an O-ring between the stem of the main needle valve and the angled body.
As a heavy seal, the sealing performance is made more reliable. Also,
It is preferable to form a connecting portion for connecting a hose, a pipe or the like on the outer end portion of the joint provided with the outlet of the sub needle valve.

In this case, the auxiliary thread for the auxiliary needle valve formed on the angled body is formed into a thread suitable for screwing in a connecting member for connecting a sealant injection device such as a grease gun. The connection member can be replaced. Further, the present drain plug is screwed to a body valve sealing position or a cavity communicating position of a ball valve in which a ball having a through hole is rotatably provided inside the valve box. In addition, the plug valve according to the present invention can be applied to a gate valve having the same function as this ball valve or a valve of another type.

[0009]

According to the present invention, since the main needle valve is provided with the O-ring which is the shaft sealing member, even if the main needle valve is not completely sealed, the main needle valve can be discharged for drainage. Even if the valve is opened, it will not leak from the stem of this main needle valve.

Next, since the outlet is also a sub needle valve, it is necessary to open both the main needle valve and the sub needle valve in order to perform drain discharge, so that careless discharge does not occur. Furthermore, since the main needle valve is locked by the lock bolt in the closed position, there is no risk that the drain plug will be inadvertently opened or that it will be opened by vibration or impact. This lock bolt is locked parallel to the stem of the main needle valve by the head of a headed bolt that is screwed into the body, and is locked by the upper and lower collars provided on the stem to prevent it from popping out and preventing it from falling off. Since it has a structure that can be operated, the structure and processing are simple, it does not take up much space and it can be locked securely, so it is extremely safe.

Since a connecting portion for connecting a hose, a pipe or the like is formed at the outer end portion of the joint of the auxiliary needle valve having the discharge port, the hose or the like is connected to this to leak the internal fluid to the outside. You can lead to a safe place and release it without any trouble. Also, if you install this drain plug for leak detection and you want to inject the sealant, replace it with a connecting member to connect the sealant injection device instead of the needle of the sub needle valve, so that grease gun etc. It is extremely easy to inject an emergency sealant with
Leak detection and immediate action can be taken immediately.

[0012]

1 is a sectional view showing an embodiment of a drain plug of the present invention, in which 1 is a plug body and 2 is a body.
Is an angled body, 3 is a main needle valve, 4 is its stem (needle), 5 is an auxiliary needle valve, 6 is its joint (needle), 7 is between the main needle valve 3 and the body 2. The attached O-ring, 8 is a lock bolt, and in this example, a headed bolt is used. Further, the male screw 2a of the body 2 is a screw portion screwed into the ball valve 10, 2b is a flow passage on the inlet side, and the screw portion 4b of the stem 4 is screwed into the body 2 coaxially therewith, Main needle valve 3 is formed, 4c
Is a valve seat of the needle, and 4d is a spanner hook portion of the main needle valve 3. The main needle valve 3 is axially sealed by an O-ring 7 mounted between the stem 4 and the body 2, and in parallel with the stem 4, the screw portion 8b of the headed bolt 8 is attached to the body 2. The head portion 8a of the headed bolt 8 is screwed in to lock the upper collar portion 4a formed in the middle of the stem 4 to lock at the closed position of the main needle valve 3 and At the time of opening, the lower collar portion 4e prevents the lock bolt from falling off, and also prevents the main needle valve 3 from popping out due to over-opening of the main needle valve 3. The interval between the upper and lower collar portions 4a and 4e provided on the stem 4 of the main needle valve 3 is set to a lift necessary for opening the main needle valve 3 or more.

A screw portion 6f provided on the joint 6 of the auxiliary needle valve 5 on the joint screw 2d of the outlet 2c of the angled body 2.
1 is screwed in, the joint 6 is provided with a hole 6a in the shaft center as shown in FIG. 1 to serve as a discharge port, 6c is a flow-through hole formed at the tip of the needle, 6d is a valve seat, 6e is a spanner hanging part. The outer end of the joint 6 is formed with a connecting portion 6b for connecting a hose, a pipe or the like, and this connecting portion can be a quick and simple joint composed of a socket and a plug. Further, the joint screw 2d of the body 2 into which the joint 6 is screwed in is a connecting member 9 having an injection passage 9b for connecting a sealant injection device such as a grease gun as shown in the partial cross-sectional external view of FIG. Since it is a screw suitable for screwing in the screw portion 9a, the sub needle valve 5 and the connecting member 9 can be replaced.

FIG. 3 is a sectional view showing an example in which the drain plug according to the present invention is applied to a ball valve. 11 in the figure
Is a valve box of the ball valve 10, 12 is a ball having a through hole 13, 14 is a ball seat provided on both sides of the ball 12, 15 is a seat retainer for holding the ball seat 14, and 16 is a ball which rotates the ball 12. A valve shaft for dynamic operation, 17 a gland flange, 18 a valve shaft provided at the bottom of the ball 12, 18a an end plate, 19-23
Is an O for sealing the sealing portion of the ball valve 10.
A ring, 24 is a sealing agent injecting member for injecting a sealing agent into the ball seat 14, 25 is a threaded portion to be provided in the communication hole 26 of the gland flange 17, 28 is a valve box 11 for communicating with the body cavity 27. The formed communication hole, 29 is a threaded portion to be provided in the communication hole 28, 30 is a female threaded portion of the communication hole 31 formed in the end plate 18a, and the other sealing portions of the ball valve 10 are appropriately provided with a communication hole and a female thread. It is possible to form a portion and screw the drain plug to the female thread portion.

Next, the operation of the above embodiment will be described. Since the main needle valve 3 is provided with an O-ring 7,
Even if the main needle valve 3 is not completely sealed, the main needle valve 3 may be drained for drainage.
Even if the valve is opened, the stem 4 of the main needle valve 3 does not leak, which is extremely safe.

The outlet 2c of the body 2 is also a sub needle valve 5
Therefore, in order to discharge the drain, both the main needle valve 3 and the sub needle valve 5 must be opened, so that careless discharge does not occur. Moreover, even if any one of the seals is incomplete, it does not leak. Furthermore, since the main needle valve 3 is locked by the headed bolt 8 in the closed state, the drain plug 1 will not be opened accidentally and will not be opened by vibration or impact. Further, since the head portion 8a of the headed bolt 8 screwed into the body 2 in parallel with the stem 4 pushes the upper brim portion 4a provided on the stem 4, the structure and processing are simple and the space is saved. It is reliable and safe.

Since the outer end portion 6b of the joint 6 of the auxiliary needle valve 5 provided at the outlet 2c is formed in a special shape for connecting a hose, a pipe or the like, a hose or the like is connected to the outer end portion 6b to allow the internal fluid to flow. It is extremely safe because it can be led to a safe place and released. When a drain plug is attached for leak detection, a connecting member 9 as shown in FIG. 2 for connecting the sealant injection device instead of the joint 6 of the auxiliary needle valve 5 is attached to the joint screw of the body 2. When screwed into 2d, it is extremely easy to inject an emergency sealant with a grease gun or the like, and it is possible to immediately detect a leak and take immediate measures against it.

As shown in FIG. 3, when the plug body 1 is screwed to the body 11 at the sealing position of the valve shaft 16 of the ball valve 10 or the lower valve shaft 18 or the communicating position of the body cavity 27, the drain shown in FIG. In the case of a plug, a hose can be attached to the connecting portion 6b so that the fluid in the body cavity 27 can be discharged to a safe place, and the drain plugs attached to the upper and lower valve shafts for leak detection are shown in FIG. By replacing the connection member 9 shown, the sealant can be supplied. In addition to the all-welded ball valve shown in FIG. 3, this drain plug can be used with a split ball valve that tightens the body, a gate valve having the same function as these ball valves, and other types of valves. Applicable to all valves.

[0019]

As is apparent from the above, the drain plug of the present invention has the following excellent effects. That is, in the main needle valve, the seal on the seat surface of the valve and the shaft seal, and on the discharge side, the seal on the seat surface of both the main needle valve and the sub needle valve are double seals. A reliable seal is provided, and the main needle valve is equipped with a locking device in the closed position so that it cannot be opened accidentally or opened by vibration or impact. Further, at the time of the opening operation, the head of the lock bolt can be loosened only up to the lower brim, so that the lock bolt can be prevented from falling off and the needle valve can be prevented from popping out. Also, since the outlet is formed in a specially shaped connection part for connecting a hose or a pipe, it is easy to connect a hose, etc., and guide the internal fluid to a safe place without leaking to the outside and discharge it. You can In addition, when using for leak detection, make it possible to easily inject an emergency sealant with a grease gun etc. so that leak detection and emergency measures can be immediately performed. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a drain plug of the present invention.

FIG. 2 is a partial cross-sectional external view showing an example of a connecting member for connecting a sealant injection device attached to the drain plug of the present invention.

FIG. 3 is a sectional view showing an example in which the drain plug according to the present invention is applied to a large diameter ball valve.

FIG. 4 is a sectional view showing an example of a conventional drain plug.

[Explanation of symbols]

 1 Plug Main Body 2 Body 2b Inlet Side Flow Path 2c Outlet 2d Joint Screw 3 Main Needle Valve 4 Stem 4a Upper Collar 4e Lower Collar 5 Sub-Needle Valve 6 Joint 6a Hole 6b Connection 7 O-ring 8 Headed Bolt 8a Head 9 Connection member 10 Ball valve 16, 18 Valve shaft 19-23 O-ring

Claims (5)

[Claims] 1. A body of a plug body is formed in an angle shape, a main needle valve is provided so as to face an inlet of the angle body, and an O-ring is provided between a stem portion of the main needle valve and the angle body. A seal part is provided, and a lock bolt that locks the main needle valve is screwed to the body, and a sub-needle valve that has a hole provided in the shaft center of the joint as an outlet is provided at the outlet of the angled body. -A drain plug characterized in that both the auxiliary needle valve and the inlet are double-sealed. 2. The lock bolt described above is a bolt with a head screwed into a body in parallel with the stem of the main needle valve, and the interval between the upper and lower brim portions provided on the stem of the main needle valve is As the lift required for opening the main needle valve or more, the lower collar is locked by the head of the lock bolt when the main needle valve is closed, and the upper collar prevents the lock bolt from falling off when the main needle valve is opened. The drain plug according to claim 1, wherein the main needle valve is prevented from popping out due to over-opening of the main needle valve. 3. The drain plug according to claim 1 or 2, wherein a connection portion for connecting a hose, a pipe or the like is formed at an outer end portion of a joint provided with a discharge port of the sub needle valve. 4. The connection screw for the auxiliary needle valve formed on the angled body is formed as a screw suitable for screwing a connecting member for connecting a sealant injection device such as a grease gun. The described drain plug. 5. The plug body according to claim 1, wherein the plug body is screwed to a body at a sealing position or a body communicating position of a ball valve in which a ball having a through hole is rotatably provided inside a valve box. Item 4. The drain plug according to item 4.