JPH09133247A - Tank bottom valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the generation of puddles in a valve seat, a diaphragm and a discharge pipe in a tank bottom valve by fixing a valve main body having a funnel-shaped flow-in hole to a fitting hole drilled in a bottom part of a tank, and opening an inclined valve seat with a flat diaphragm. SOLUTION: When the compressed air at predetermined pressure 19 supplied to a pressure receiver chamber 14 of a tank bottom valve, a spring 17 is compressed, and a piston 13, a piston rod 19, a diaphragm 4 are driven to the valve opening direction. The diaphragm 4 is thereby separated from the valve seat 3 so as to open the tank bottom valve, and the liquid is flowed out from a flow-in port 1 through a flow-out pipe 2. When the supply of the compressed air to the pressure receiver chamber 14 is stopped and the inner pressure of the pressure receiver chamber 14 is reduced to the atmospheric air, the diaphragm 4 is locked with the valve seat 3 for closing. At this stage, a lower end of the flow-in port 1 is formed with the inclined valve seat 3, and the flat- shaped diaphragm 4 is fitted to the inclined valve seat 3, and the flow-out pipe 2 is provided nearly under the inclined valve seat 3 so as to eliminate the generation of puddles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank bottom valve installed at the bottom of a tank used for discharging a liquid contained in a tank.

[0002]

2. Description of the Related Art Conventionally used tank bottom valves are shown in FIGS. In FIG. 3, a valve 102 is provided at the bottom of the tank 101, and the handle 103 is rotated to move the valve 102 up and down to cause the fluid to flow out from the discharge pipe 104.

In FIG. 4, a valve 202 is provided at the bottom of a tank 201, and the valve 202 is attached to a diaphragm 205, which is actuated by a cylinder 206 to operate the valve 20.
Fluid is discharged from the discharge pipe 204 by opening and closing 2.

[0004]

In the tank bottom valve of FIGS. 3 and 4, there is a shaft portion in both of which, it is difficult to clean, and there is a case where the valve is easily contaminated by the diaphragm or the O-ring seal. Further, in FIG. 4, although the liquid pool is reduced, the liquid pool is generated over the entire circumference of the diaphragm tightening portion.

On the other hand, in FIG. 3, the valve 102 is the tank 10
When it is inside 1, and when it is open, it projects into the tank 101, so the rotating blades of the agitator hit the valve 102.
There is a restriction on the installation of the stirrer installed in 1, which may hinder the stirring of the liquid in the tank.

[0006]

In view of the above circumstances, therefore, the present invention minimizes the number of difficult-to-clean places to minimize the liquid pool, and the valve itself can be installed outside the tank. As a structure, the valve itself can be easily cleaned, pollution can be prevented, product quality can be improved, and the valve itself can be installed outside the tank to ensure agitation of the product in the tank, improving product quality. In order to achieve this, a mounting hole is formed in the bottom of the tank, a valve element having a funnel-shaped inlet hole is fixed to the mounting hole, and the lower end of the funnel-shaped inlet hole is formed into an inclined valve seat that is inclined with respect to the horizontal plane. The diaphragm is provided so as to cover the valve seat, and the diaphragm is driven forward and backward by an actuator to open and close the valve seat, and the discharge pipe is provided as a tank bottom valve provided near the lower position of the inclined valve seat.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to specific embodiments shown in FIGS. In FIG. 1, a mounting hole 7 is formed in the bottom of a tank 6, and a valve body 8 having a funnel-shaped inflow hole 1 and an outflow pipe 2 is fixed to the mounting hole 7, and the lower end of the inflow hole 1 is fixed. Forms a tilted valve seat 3 which is tilted with respect to the horizontal, and is provided so as to cover the valve seat 3 and the valve chamber 18 at the lower end of the valve body 8 with a flat diaphragm 4, and the diaphragm 4 is driven forward and backward by an actuator 5. The valve seat 3 is opened and closed by the diaphragm 4, and the outflow pipe 2 is provided near the lower position of the inclined valve seat 3.

As the drive source of the actuator 3, any drive source such as electric, hydraulic pressure, pneumatic pressure, etc. can be used, but here pneumatic pressure is used as the drive source. That is, the actuator 5 of this embodiment is composed of a single-acting air cylinder, covers the diaphragm 4, and faces the valve chamber 18 of the valve body 8, and the cylinder chamber 12 formed in the valve lid 11. A piston 13 slidably fitted in the cylinder chamber 12, a pressure receiving chamber 14 defined by the piston 13 in the cylinder chamber 12, and the valve lid 11, which is formed in the cylinder lid 12. Supply port 15 connected to the source, a spring case 16 assembled on the side opposite to the valve body 8 of the valve lid 11, and a spring case
A spring 17 that is housed in the piston 16 and biases the piston 13 toward the pressure receiving chamber 14 is provided.

The piston 13 passes through the valve lid 11 and the valve chamber 18
An indicator 21 is connected to the central portion of the diaphragm 4 via a piston rod 19 that rushes into the piston rod 19, and an indicator 21 that is inserted into the end wall 20 of the spring case 16 so as to be retractable outside thereof is connected to the piston rod 19. Reference numeral 22 is an air hole in the spring case 16, and reference numeral 23 is also an air hole. When compressed air having a predetermined pressure is supplied from the compressed air source to the pressure receiving chamber 14 of the tank bottom valve, the spring 17 is compressed and the piston 13, the piston rod 19 and the diaphragm 4 are driven in the valve opening direction. The diaphragm 4 is separated from the valve seat 3 and the tank bottom valve is opened, and the liquid flows out of the inflow hole 1 through the valve seat 3 and the outflow pipe 2 to the outside.

When the supply of compressed air to the pressure receiving chamber 14 is stopped and the internal pressure of the pressure receiving chamber 14 is reduced to the atmosphere, the spring 17 extends and the piston 13, the piston rod 19 and the diaphragm 4 are driven in the valve closing direction. As a result, the diaphragm 4 comes into close contact with the valve seat 3 and the tank bottom valve is closed. Here, in this tank bottom valve, in order to eliminate the liquid pool, the valve seat 3 at the lower end of the inflow hole 1 is formed to be inclined, and the flat diaphragm 4 is attached to the valve seat 3 so that the valve seat 3 can be positioned below the inclined valve seat 3. The outflow pipe 2 is provided in the.

Further, in the present invention, since there is no protrusion on the side of the inflow hole 1 of the diaphragm 4 and it is flat, it is easy to clean and is unlikely to be contaminated. Further, in the present invention, since there are no protrusions into the tank 6, there is nothing that hinders the rotation of the rotary blades of the stirrer, the stirring of the liquid in the tank 6 is not hindered, and the liquid in the tank 6 is not disturbed. Can be sufficiently stirred.

Furthermore, in the present invention, since the actuator 5 and the diaphragm 4 can use the conventional products, no die cost is required, and only the pipe member 8 needs to be changed, so that it can be provided at a low cost. When the liquid pool does not pose a problem, as shown in FIG. 2, a cleaning pipe 32 is provided in a direction orthogonal to the outflow pipe 2 in FIG. 1, and the cleaning liquid is flown through the cleaning pipe 32 to allow the valve seat 3 and the diaphragm 4 to flow. Can be washed and steam sterilized.

[0013]

As described above, according to the present invention, a mounting hole is formed in the bottom of a tank, a valve body having a funnel-shaped inflow hole is fixed to the mounting hole, and the lower end of the funnel-shaped inflow hole is set horizontally. Formed on an inclined valve seat, a flat diaphragm is provided so as to cover the valve seat, the diaphragm is driven forward and backward by an actuator to open and close the valve seat, and the outflow pipe is moved toward the lower position of the inclined valve seat. Since it is the tank bottom valve provided in the above, there is no liquid pool in the valve seat, the diaphragm and the discharge pipe, and it is possible to provide a high quality product. It can maintain high quality of liquids that require certain strict quality, such as ultrapure water, sterile water, and culture liquid used in the fields of pharmaceutical manufacturing, food manufacturing, etc., and prevent product loss due to liquid pooling. You can

Further, in the present invention, since there are no protrusions in the tank, the rotary blades of the stirrer can be installed up to the vicinity of the bottom of the tank, sufficient liquid can be stirred, and it is particularly suitable for stirring high viscosity liquid. .

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a specific embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of another embodiment of the tank bottom valve when a liquid pool is allowed.

FIG. 3 is a vertical sectional view of a conventional tank bottom valve.

FIG. 4 is a vertical cross-sectional view of another conventional tank bottom valve.

[Explanation of symbols]

 1 ... Funnel-shaped inflow hole 2 ... Outflow pipe 3 ... Valve seat 4 ... Diaphragm 5 ... Actuator 7 ... Mounting hole 8 ... Valve body 16 ... Tank 11 ... Valve lid 12 ... Cylinder chamber 13 ... Piston 14 ... Pressure receiving chamber 15 ... Pilot supply Mouth 16 ... Spring case 17 ... Spring 18 ... Valve chamber 19 ... Piston rod 20 ... End wall 21 ... Indicator 22 ... Air hole 23 ... Air hole 32 ... Outflow pipe

Claims (1)

[Claims] 1. A mounting hole is formed in the bottom of a tank, a valve body having a funnel-shaped inflow hole is fixed to the mounting hole, and the lower end of the funnel-shaped inflow hole is formed into an inclined valve seat inclined with respect to the horizontal. A tank bottom valve provided with a flat diaphragm so as to cover the valve seat, and the diaphragm is driven forward and backward by an actuator to open and close the valve seat, and the outflow pipe is provided near the lower position of the inclined valve seat.