JPS6135828Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a valve device, and in particular, a valve body that forms a fluid passage, a valve seat that is screwed to the valve body so that its movement can be adjusted, and a fluid port of this valve seat. This invention relates to an improvement in a valve device that is comprised of a valve body and a float that opens and closes, and is installed in a tank and used as a pilot valve.

1 and 2 are sectional views showing a conventional valve device of this type, with FIG. 1 showing the closed state and FIG. 2 showing the open state. In this figure, 1 is a valve body that is fixed in a tank (not shown) and forms a fluid passage 2 that receives fluid transfer pressure, and 3 is an opening 5 at one end of the fluid passage 2 of this valve body 1.
A valve seat is fluid-tightly connected to the valve body 1 via an O-ring 4 to form a fluid port 6, and is screwed to the valve body 1 by screw fitting 7 or the like so that its movement can be adjusted. . 8 is a valve body such as a poppet valve that abuts against this valve seat 3 and opens and closes the fluid port 6; 9 is a valve body 8 and a fixed plate 10 of the valve body 1 that rotate with different axes; It is a float that has connecting rods 11 that are freely connected and that operates the valve body 8 according to the liquid level 12 in the tank. 1
3 protrudes from the fixed plate 10, and the float 9
This is a stopper that prevents the valve body 8 from opening again if the valve body 8 rises too much.

In the conventional system configured as described above,
When the liquid level 12 in the tank is below a predetermined level, the valve body 8 opens the fluid port 6 as shown in FIG.
There will be more inflow. When the liquid level 12 in the tank exceeds a predetermined level, the valve body 8 is pushed up by the float 9 and collides with the valve seat 3 to close the fluid port 6 as shown in FIG. Thereafter, this process is repeated to keep the liquid level 12 in the tank constant.

However, in the conventional device described above, even if the transfer pressure of the fluid passing through the fluid passage 2 changes within a predetermined maximum value, the valve body 8 is designed to maintain the liquid level in the tank within a predetermined range. In order to accurately open and close the screw fitting 7, the movement of the screw fitting 7 must be adjusted according to the set transfer pressure.
There was a drawback that the valve seat 3 moved and vibrated when the transfer pressure changed because there was no play to prevent this. As a result, the valve body 8 does not properly abut against the valve seat 3, resulting in the inconvenience that the liquid level in the tank cannot be maintained within a specified level. In the case of a metal valve seat and metal valve body, if abnormal force is applied due to improper adjustment, the valve may stick, damaging the valve seat, or not opening even if the liquid level in the tank drops. .

This invention was devised in view of these drawbacks, and as shown in one embodiment in FIG. 14 is interposed between the fluid passage 2 of the valve body 1 and the fluid port 6 of the valve seat 3 so as not to obstruct the fluid passage,
The valve seat 3 is always pressed in a direction away from the valve body 1. Note that in FIG. 3, the same or corresponding parts as in FIGS. 1 and 2 are given the same reference numerals, and therefore the description of the other parts will be omitted.

As mentioned above, in this design, a spring with a load greater than the fluid transfer pressure that the valve seat receives is installed between the valve body and the valve seat, so the transfer pressure changes and a force greater than the spring load is applied to the valve body. When applied, the valve body moves by the amount of screw play, preventing sticking between the valve body and valve seat and damage to the valve seat, and allowing the valve body to open and close accurately according to the liquid level in the tank. Not only can the level be maintained within a specified range at all times, but the adjustment work can also be done precisely in a short period of time.Furthermore, with the specified transfer pressure, the valve seat does not move or vibrate. In addition, if abnormal force is applied due to improper adjustment, the valve seat and valve body can be moved and prevented from being damaged or stuck.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional valve device, with FIG. 1 showing the closed state and FIG. 2 showing the open state. FIG. 3 is a sectional view of the valve body showing an embodiment of this invention. In addition, the same reference numerals in the figures indicate the same or equivalent parts, 1 is the valve body, 2 is the fluid passage, 3 is the valve seat,
6 is a fluid port, 8 is a valve body, 9 is a float, 13 is a stopper, and 14 is a spring.

Claims (1)

[Scope of utility model registration request] A valve comprising a valve seat that is fluid-tightly coupled to an opening at one end of a fluid passage of a valve body to form a fluid port, and a valve body that abuts against the valve seat and opens and closes the fluid port, wherein the valve seat is connected to the valve body. A valve device comprising a spring interposed between the valve body and the valve seat, the spring being screwed to the main body so that its movement can be adjusted and having a load greater than the fluid transfer pressure received by the valve seat.