JPH09144895A - Follow jet valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To straightly protrude and retreat a valve element, uniformly seal the whole surface of a circumferential surface of a valve seat by the valve element, and prevent leakage of fluid by arranging a support means to prevent handing-down of the valve body in the valve element in a follow jet valve to open and close a valve port by protrusion and retreat of the valve element. SOLUTION: A follow jet valve 1 is formed by arranging a needle-like valve element 3 in a cylincylindrical valve casing 2 whose one end part side is formed more or less in a narrow diameter, and has a valve seat 4 with which a valve element 3 comes into contact. This valve element 3 is protruded and retreated in the horizontal direction by a cylinder 5 driven by oil pressure and air, and since it is made of metal and has fair weight, when a valve bar 7 of the valve element 3 fully extends from the cylinder 5, it hangs down by dead weight of the valve element 3. Therefore, a bar 8A is arranged so as to hand down from the valve bar 7, and a wheel 8B is installed in a lower end part of the bar 8A, and is formed as a support means 8. Therefore, hanging-down by dead weight of the valve element 3 is prevented, and sealing performance at valve closing time is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow jet valve having a needle-shaped valve body, for example.

[0002]

2. Description of the Related Art FIG. 2 is a schematic view of a valve body of a conventional hollow jet valve. The valve body 20 has a needle shape and has a considerable weight. The valve body 20 moves back and forth by a cylinder 21 driven by hydraulic pressure or air, and abuts and separates from a valve seat (not shown) to open and close the valve port. It is carried out.

[0003]

However, in the conventional hollow jet valve, when the valve rod 22 of the valve body 20 is extended by the cylinder 21, as shown in FIG. It cannot support horizontally with only one end, and hangs downward due to its own weight. For this reason, there is a problem in that the valve body 20 does not come into proper contact with the valve seat and a gap is created between the valve body and the valve seat, causing fluid leakage.

The present invention solves the above-mentioned conventional problems and eliminates sagging due to the weight of the valve body.
An object of the present invention is to provide a hollow jet valve that can prevent fluid leakage.

[0005]

In the hollow jet valve of the present invention, the valve body is provided with a support means for preventing the valve body from hanging down. This supporting means may be, for example, a bar that hangs down from the valve body to support the valve body from below or a bar that hangs from above to support the valve body. Also,
The valve body may be supported by a wing-shaped member extending horizontally from the valve body to prevent the valve body from hanging down, and any means may be used.

[0006] The valve element is moved straight out by the means for supporting the valve element, and the valve element evenly seals the entire circumferential surface of the valve seat.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an embodiment of a hollow jet valve of the present invention. This hollow jet valve 1 has a cylindrical valve box 2
The needle-shaped valve body 3 is arranged inside.
The cylindrical valve housing 2 has a slightly narrower diameter on one end side and is provided with a valve seat 4 with which a valve body 3 abuts.

[0008] The valve body 3 is horizontally retracted (left and right in FIG. 1) by a cylinder 5 driven by hydraulic pressure or air, and the valve body 3 abuts against and separates from the valve seat 4 to open and close the valve port 6. To do. The valve body 3 is metallic and has a considerable weight, and when the valve rod 7 of the valve body 3 extends beyond the cylinder 5, the valve body 3 hangs down due to its own weight. Therefore, a support means 8 is provided at the tip of the valve rod 7 to prevent the valve body 3 from hanging under its own weight. The support means 8 of this embodiment is provided with a bar 8A hanging from the valve rod 7, and a wheel 8B is attached to the lower end portion of the bar 8A.

In the cylinder 5, a piston 10, which also serves as the valve rod 7, is fitted in a cylindrical casing 9, a packing 11 is interposed between the outer periphery of the rear end of the piston 10 and the casing 9, and the tip of the casing 9 is provided. A packing 12 is also interposed between the inner circumference and the piston 10 to maintain airtightness.
Reference numeral 13 is a pipe for supplying oil or air to the rear chamber 14 of the piston 10, and 15 is a pipe for supplying oil or air to the outer peripheral chamber 16 of the piston 10.

Next, the operation of the above configuration will be described. FIG. 1 shows the open state of the hollow jet valve. To close the valve from this open state, air or oil is supplied from the pipe 13 into the rear chamber 14 of the piston 10 to extend the cylinder 5 to the valve seat 4 side and close the valve. At that time, the supporting means 8 supports the heavy valve body 3 and keeps the valve rod 7 horizontal so as not to hang downward. Therefore, the valve element 3 accurately contacts the valve seat 4 and evenly seals the entire circumferential surface of the valve seat 4 to prevent fluid leakage. The wheels 8B attached to the valve rod 7 act so that the movement of the supporting means 8 moves smoothly.

To open this valve 1, the cylinder 5
Air or oil is supplied to the outer peripheral chamber 16 from the pipe to contract the cylinder 5 and close the valve. In the above-described embodiment, the support means 8 suspends the bar 8A from the tip of the valve rod 7,
Although the wheel 8B is provided at the lower end of A, it goes without saying that the present invention is not limited to such a configuration. For example, bar 8A
The wheel 8B may not be necessarily provided if the lower end of the wheel slides smoothly. Further, the valve body 3 may be supported so as to be hung from above. Further, a wing-shaped plate that horizontally projects from the valve body may be guided along a guide groove formed on the side surface of the valve box, and its supporting means is not limited.

In the above-described embodiment, the cylinder 5 has a structure in which the valve element is moved out and forward. However, the valve is not limited to such a structure, and the valve element is moved in and out by rotating the gear. May be

[0013]

As described above, according to the present invention, due to the above-mentioned constitution, the valve element is straightly retracted, the valve element evenly seals the entire circumferential surface of the valve seat, and the fluid leakage can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view of a hollow jet valve according to an embodiment of the present invention.

FIG. 2 is a schematic view of a valve body of a conventional hollow jet valve.

[Explanation of symbols]

 1 Hollow Jet Valve 2 Valve Box 3 Valve Body 4 Valve Seat 5 Cylinder 6 Valve Port 8 Support Means

Claims (1)

[Claims] 1. In a hollow jet valve in which a needle-like heavy valve element is arranged in a valve box and a valve port is opened and closed by the withdrawal of the valve element, a support means for preventing the valve element from hanging down is provided in the valve element. A hollow jet valve characterized by being provided.