JPH0440058Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a valve installed in a tank installed in a railway vehicle, ship, automobile, etc. to store water or the like.

[Conventional technology]

Figure 3 shows a water tank 30 installed on a railway vehicle.
This shows that. Water stored in the water tank 30 is supplied from a water supply pipe 31 to a water cooler or the like disposed inside the vehicle. Also, this water tank 3
0 generally includes a water test valve 32 for checking whether the amount of water stored is above a predetermined value, and a drain valve 3 for draining water from the tank 30.
3 is provided.

The water test valve 32 is opened at the time of a station stop and checks the presence or absence of water discharged from the outflow portion 29.
This is for checking whether the water level in the tank 30 is above or below the water test valve 32. Then, when there is no water discharged from the water test valve 32, water is replenished into the tank 30.

The above conventional water test valve 32 and drain valve 33
, a valve B having a structure as shown in FIG. 4 is adopted. In the valve B, a valve box 23 having an inflow part 28 and an outflow part 29 is provided integrally with a tank 30. A valve stem 24 and a valve body 25 are housed inside the valve body 23, and the valve seat 2 of the valve body 25
The abutment and separation from the valve 7 is controlled by an operation handle 21 via a valve pusher 22.

[The problem that the idea aims to solve]

In many cases, the above-mentioned inspection of the amount of water stored in the water tank 30 and the water supplying operation must be completed during a short stoppage time of the train. Therefore, the opening and closing operation of the valve B must be performed quickly.

Specifically, opening and closing the valve B means rotating the operating handle 21 to open and close the valve pusher 22 and the valve stem 24.
This is to move the valve body 25 through the . Conventionally, the degree of tightening of the valve B was determined based on intuition and experience, and in the rush of work, when crimping the valve body 25 to the valve seat 27, excessive torque was used to tighten the valve body 25. A problem has often arisen in which the gasket 26 is irreversibly deformed or damaged. Furthermore, if the pressing force of the valve body 25 against the valve seat 27 is extremely excessive, or if the structure becomes weakened due to repeated operations,
Damage to the valve body 23, valve stem 24, or valve body 25 results. Due to the structure of conventional valve B, it is extremely difficult for the operator to properly control the tightening torque, so repeated operations accelerate the deterioration of each member, resulting in the above-mentioned defects occurring frequently. Ta.

If the above-mentioned defect occurs in valve B,
The water stop function is impaired and water leaks, resulting in insufficient water storage in water tanks, etc. Furthermore, in the conventional example, since the valve B and the tank 30 are integrated, it is necessary to replace not only the defective valve B but also the water tank in some cases, which requires time. However, there is a problem in that the manpower and costs are enormous. Furthermore, there was a risk that it would hinder vehicle operation and lead to a decline in passenger service.

[Means to solve the problem]

The present invention is a valve having a novel structure devised in view of the above-mentioned conventional problems, and its features include a valve stem connected to a valve body, and a crimping of the valve body to a valve seat. A pressure buffer made of an elastic material is interposed between the valve pusher that operates the separation, and a stop means is provided to set a limit of movement of the valve pusher in the valve body compression direction. It is.

[Effect]

By adopting the above configuration, the valve according to the present invention (hereinafter referred to as the valve according to the present invention) has the following features:
The force that presses the valve body against the valve seat is transmitted from the valve pusher body to the valve stem via a pressure buffer made of an elastic material. Therefore, if the pressure force exceeds a predetermined value after the valve body contacts the valve seat, the pressure buffer will elastically contract, causing the pressure force of the valve body against the valve seat to become excessive. to prevent Furthermore, since the limit of movement of the valve pusher in the valve body pressing direction is set by the stop means, the maximum pressing force of the valve body against the valve seat does not exceed a predetermined value. Therefore, when the valve body is closed, no extra force is applied to each part including the valve body, so there is no risk of damage or accelerated deterioration of the members.

In addition, the valve of the present invention exhibits an excellent water-stopping function because by moving the valve pusher and the valve body to the stop position, the valve body can be pressed against the valve seat in an appropriate state and the flow path can be reliably closed. Moreover, since the maximum pressure force of the valve body is limited, even if the valve body is repeatedly opened and closed, the state of pressure contact between the valve body and the valve seat is always maintained properly. Therefore, the water stop function does not deteriorate over a long period of time.

〔Example〕

The details of the present invention will be explained in Figs.
This will be explained based on the diagram.

First, the structure of the valve A of the present invention will be explained. The outer shell of the valve A is the operating part 1 and the valve pusher 2.
an upper outer shell 4 that forms the lid of the valve box 7, and a lower outer shell 5 that forms the majority of the valve box 7 and the valve seat 10 and is provided with an inlet 17 and an outlet 18.
It becomes more. In this embodiment, the lower shell 5 is provided integrally with the tank 30. The operation unit 1 is
It is a handle-shaped member fixed to one end of the valve pusher 2, and is used to rotate the valve pusher 2. The valve pusher body 2 has a threaded portion 2a that is screwed into the upper outer shell 4, and a double nut is screwed into the threaded portion 2a as a stop means 3 for the valve pusher body 2. A buffer mechanism 11 is provided at the other end to adjust the pressing force of the valve body 8 against the valve seat 10. This buffer mechanism 11 includes a cylinder body 12 whose lower end is open and has a storage chamber 13 inside, a compression force buffer 14 such as a spring loaded in the storage chamber 13, and a cylinder body 12 that is opened at the lower end of the cylinder body 12 and has a storage chamber 13 therein. It consists of a lid body 16 attached. and valve stem 6
However, one end thereof is inserted into the storage chamber 13 through the lid 16, and is prevented from coming off by a flange 15 attached to the side. Thereby, the valve rod 6 is connected to the valve pusher body 2 via the buffer mechanism 11. A valve body 8 is attached to the other end of the valve stem 6.
A gasket 9 for maintaining watertightness is attached to the surface of the valve body 8 that is press-fitted to the valve seat 10.

Valve A in FIG. 1 shows a state in which the flow path is open. That is, the valve body 8 is spaced apart from the valve seat 10, and the water supplied from the water supply source flows through the inflow portion 1.
After passing through the valve box 7 from 7, it is sent out from the outflow section 18 to the discharge section.

In order to close the flow path in the valve A, the operating portion 1 is rotated and the valve pusher body 2 is screwed in the direction in which the valve body 8 is pressed. Then, the buffer mechanism 11 and the valve stem 6
move together, and as shown in FIG. 2, the valve body 8 is pressed against the valve seat 10. This blocks the flow of water from the inlet 17 to the outlet 18.

By the way, as mentioned above, the rotation operation on the operation part 1 is not necessarily performed properly, and excessive tightening is often performed. In such a case, with the valve A according to the present invention, after the valve body 8 contacts the valve seat 10, the operating part 1 is further rotated to screw the valve pusher body 2 in the valve body crimping direction. At times, the compression force buffer 14 interposed between the valve pusher 2 and the valve stem 6 elastically contracts, causing the cylinder portion 1 of the valve stem 6 to
The insertion length into 2 increases. In other words, the distance between the valve pusher 2 and the valve element 8 is reduced, and a proper crimped state is maintained. Furthermore, the threaded portion 2a of the valve pusher 2 is provided with a stop means 3, and the stop means 3 comes into contact with the surface of the upper outer shell 4, thereby stopping the movement of the valve pusher 2. Therefore, even if the operator does not pay special attention, by simply rotating the operating part 1 until it stops, a proper crimped state that ensures water stoppage and does not cause damage to the valve body 8 can be easily obtained. I can do it. The stop means 3 is constructed of a double nut or the like as shown in the figure, and by making it possible to change the screwing position to the valve pusher body threaded portion 2a, the movement limit of the valve pusher body 2 can be changed, and the valve body It is possible to adjust the maximum crimping force of 8.

Furthermore, if the valve body 8 has a structure that vertically closes the inflow portion 17 as in this embodiment, when an abnormal increase in water pressure occurs on the primary side of the flow path, the pressure absorbing member 1
4 retracts to separate the valve body 8 from the valve seat 10, which acts to alleviate the pressure increase on the primary side of the flow path. Normally, water tanks installed in railway vehicles contain 1Kg/cm ²
Since a certain amount of internal pressure is applied, even a slight thermal expansion or a change in air pressure while passing through the tunnel will have a considerable effect on the water tank and valve A. As in this embodiment, the water tank 30 of a railway vehicle
When the valve A according to the present invention is installed, the valve A has a function as a safety valve, so an excellent effect is exhibited in that the durability performance of the water tank 30 against pressure fluctuations is improved.

Furthermore, the valve A of this embodiment has many structural parts in common with the conventional valve (see Figure 4) to ensure compatibility, so there is almost no increase in manufacturing costs and the installation process is easy. There is no loss in workability at all.

The embodiments of the valve of the present invention are not limited to those described above, and various changes can be easily made depending on the mode of implementation.

[Effect of idea]

As is clear from the above description, in the valve of the present invention, a pressing force acts from the valve pusher to the valve element via the pressing force buffer. Furthermore, a stop means is provided for setting a limit of movement of the valve pusher in the valve body pressing direction. Therefore, it is possible to easily apply the maximum pressure force to the valve body that can reliably shut off water within a range that does not cause damage. Therefore, when the valve of the present invention is installed in a water tank of a railway vehicle or the like, it can easily handle opening/closing operations in a short period of time, thereby improving the speed of work. In addition, even if used for a long time,
Since damage to the proposed valve is extremely rare, the incidence of water leakage accidents is significantly reduced. As a result, there is a significant saving in repair costs that were previously necessary, and in the case of railway vehicles, there is no risk of unexpected water outage accidents, so there is no reduction in passenger service. This is particularly effective when applied to vehicles on routes with long travel distances and many passengers, such as the Shinkansen.

As described above, the present invention provides a valve that has many excellent practical effects.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the valve according to the present invention, in which FIG. 1 is a vertical cross-sectional view of the valve in a flow path open state, and FIG. 2 is a vertical cross-sectional view of the valve in a flow path closed state. FIG. 3 is a longitudinal cross-sectional view of the valve. FIG. 3 is a front view showing a conventional water tank installed in a railway vehicle, and FIG. 4 is a longitudinal sectional view showing a conventional valve. A...Valve, 1...Operation section, 2...Valve pusher,
3... Stopping means, 6... Valve stem, 7... Valve box, 8...
...Valve body, 9...Packskin, 10...Valve seat, 14...
...Crimping force buffer, 17...Inflow section, 18...Outflow section, 30...Tank.

Claims (1)

[Scope of utility model registration request] A valve for a tank installed and moved in a railway vehicle, ship, automobile, etc., which includes a valve stem connected to a valve body, and a valve pusher that operates to press and separate the valve body from a valve seat. A valve for a movable tank, characterized in that a compression force buffer made of an elastic material is interposed therebetween, and a stop means is provided for setting a limit of movement of the valve pusher in the valve body compression direction.