JPS6338773A - Ceramic valve capable of sampling - Google Patents

Abstract

PURPOSE:To make it possible to carry out sampling having a low possibility of contamination by residual liquid, by forming the fit surface of a cock and a seal as tapered surfaces, and by forming a sample extraction port substantially orthogonal to a fluid passing hole in a seat. CONSTITUTION:The fit surfaces of a cock 1 and a seat 2 are formed as tapered surfaces, and a spring 5 is provided between the cock 1 and the seat 1 to urge the cock 1 always toward the seat surfaces of the seat 2, and a sample extraction hole is formed in the seat in the direction substantially orthogonal to a fluid passing hole 21. With this arrangement, when a lever 31 is turned to the position of sampling, liquid charged in a fluid passing hole 11 in the cock 1 flows down through the sample extraction hole and is therefore stored in a container, thereby it is possible to carry out sampling with no fear of contamination by residual liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a sampling valve whose main parts are made of ceramic.

[Prior Art] Valves used to construct equipment for transporting acids, alkalis, and other corrosive liquids, as well as slurry that easily causes wear, have traditionally been made of various materials such as stainless steel and cemented carbide, as well as Teflon and other materials. A combination of these has been used. However, if there are metal fitting surfaces in the valve structure, it is inevitable that sludge will get in there and cause galling on the metal surfaces, and Teflon and other materials have a limited heat resistance. If it moves af, there is concern about wear resistance.

Therefore, ball valves whose main parts are made of ceramic are becoming popular as valves that can be used under harsh conditions such as high temperatures that fluororesin and other valves cannot withstand, and maintenance-free requirements.

On the other hand, it is often required for the valve to have a sampling function, and methods have been attempted in which the sample liquid is handled by gravity or pushed out by air pressure.

From a manufacturing standpoint, processing ceramics is difficult, so in the case of ball valves, there is a limit to the accuracy of the spherical finish of both the ball and the seat, and costs are high.

Ceramic ball valves currently in use have a structure in which a ceramic ball is sandwiched between ceramic sockets with ceramic seats on both sides. This is because, due to the structure, there is an angle during the rotation of the ball that makes it impossible to seal with the seat, at which point the liquid migrates into the cavity inside the valve box.
Although leakage of liquid to the outside is prevented by an O-ring between the socket and the box, there is a risk that this residual liquid may be mixed in when sampling.

[Problems to be solved by the invention] For this reason, there is a need for a ceramic valve that takes advantage of the advantages of ceramics, is easy to manufacture, low cost, and allows sampling without worrying about contamination with residual liquid. It had been.

An object of the present invention is to provide a valve that meets these demands.

Structure of the invention [Means for solving the problem] The sampleable ceramic valve of the present invention has the following features:
As shown in FIGS. 1 to 3, it has a cock 1 made of ceramics that is in the shape of an inverted trapezoid and has a fluid passage hole 11 that crosses its axis, and a seat surface that corresponds to the taper of the cock, A ceramic seat 2 having a fluid passage hole 21 that crosses the seat surface is attached to the valve box members 4A and 4B together with a stem 3 that rotationally drives the cock 1.
It is a valve that is integrated with stem 3 and cock 1.
A spring 5 is placed between the cock 1 and the cock 1 so that the cock 1 is always pressed toward the sheet surface of the sheet 2. It is characterized by having been established.

In FIG. 1, 31 is a lever for operating the stem.

Taper angle of cock and seat surface is 1.5-30'
Choose from a range of. If this angle is too small, the force pressing the cock against the seat surface will be weak, causing problems with sealing. On the other hand, if it is too large, the force of the fluid will push the cock toward the stem. Usually, a range of 2 to 15 degrees is suitable.

As shown in FIG. 2, the surface of the cock 1 is preferably provided with at least one groove 12 (in the illustrated example, two grooves each above and below the liquid passage hole) that goes around the tapered surface. This groove may be provided on the sheet surface. A similar effect can be obtained by forming the cock surface and/or seat surface into a rough surface instead of providing the grooves.

In addition, a weaker spring (not shown) is placed below the cock 1, opposite the upper spring 5, and the force of pressing the cock against the seat is adjusted appropriately by balancing the forces of the upper and lower springs. It is highly recommended that you adjust the

In order to facilitate sample collection, it is preferable to provide a gas inlet 7 or a sample extrusion port on the sheet 2 at a position facing the sample collection port 6 across the cock 1.

Also, if a bolt 8 is provided on the seat 2 at a position facing the stem 3 across the cock 1 so that the cock 1 can be pushed up by the forward movement of the bolt 8, the cock 1 may become difficult to rotate for some reason. You can solve it when you need it.

The ceramics used for the cock and seat may be oxides such as alumina Af1203 and zirconia ZrO2, or non-oxides such as silicon carbide SiC and silicon nitride 513N4.

A composite material in which the main body is made of metal and the surface is coated with ceramics can also be used.

(Function) If a cock that uses a tapered surface is made of metal, smooth rotation cannot be expected unless measures are taken, such as applying lubricant to the sliding parts or combining sheets such as Teflon. In contrast, ceramic parts can easily rotate due to the high interlocking nature of the material itself.

Since the interlocking properties of ceramics vary depending on the surface roughness, it is necessary to select an appropriate degree of surface finish.

Providing the groove 12 on the outer periphery or seat surface of the cock 1 is of great help in ensuring smooth rotation of the cock.

Select the taper angle and the spring cock pressing force (if the spring is used above and below, the balance of that force), taking into consideration the size of the valve, the physical properties of the fluid flowing through the line, and conditions such as temperature and pressure. This provides a valve that does not leak and can be operated smoothly.

Since the spring 5 above the cock rotates together with the stem 3 and the cock 1, no wear occurs due to sliding on the ceramic material.

The valve of the present invention is typically used as shown in FIG. In other words, the pie line 9 runs horizontally.
Incorporate into A and 9B, and use lever 31 when sampling.
Rotate to the position indicated by the dashed line. Then, the liquid sealed in the fluid passage hole 11 of the cock 1 flows into the sample collection port 6.
It flows down through and is contained in a container. At this time, if necessary, air or other gas is blown through the upper gas inlet 7 to ensure liquid discharge. Especially in the case of liquids or slurries with high viscosity, the fluid passage hole 1 of the cock
It is also possible to forcibly extrude the inside of 1 by passing something like a plunger (not shown).

Since the sampling capacity is determined by the volume within the fluid passage hole 11 of the cock, the desired volume can be obtained by adjusting the volume.

Effects of the Invention The sampleable ceramic valve of the present invention has
Since the taper surface is used for the contact between the cock and the seal, it is easy to manufacture even ceramics, and a leak-free product can be provided at a low cost.

Since it is not combined with fluororesin, etc., it is possible to take full advantage of the properties of ceramics, such as heat resistance, corrosion resistance, and abrasion resistance.

Sampling is easy and a constant amount can always be collected. Due to its structure, there is almost no residual liquid, so there is no need to worry about sample contamination.

The explanation given above with reference to the drawings relates to a sampling valve with four-way ports. It can also be formed into a one-way valve, a three-way valve, a branch valve, a mixing valve, etc. Their construction may follow what is known in valve technology.

Furthermore, it goes without saying that the valve is not limited to the case where the fluid is a liquid, and can be configured to be a valve intended for gas by selecting the degree of finishing of the driving surface.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view taken along the direction I--2 in FIG. 4, showing a preferred example of the sampleable ceramic bulb of the present invention. FIG. 2 is a side view showing the cock of the valve of the present invention. FIG. 3 is a cross-sectional view of the valve shown in FIG. 1 taken in the direction of FIG. 4 - ■. FIG. 4 is a side view illustrating an aspect of using the valve of the present invention in a pipeline together with a sampling method.

Claims (5)

[Claims] (1) Fluid passage hole 1 that is in the shape of an inverted truncated cone and crosses its axis
A stem 3 for rotationally driving the cock 1 includes a ceramic cock 1 having a diameter of 1 and a ceramic seat 2 having a seat surface shaped to correspond to the taper of the cock and having a fluid passage hole 21 that crosses the seat surface. In addition, the valve is formed by integrating valve box members 4A and 4B, and a spring 5 is placed between the stem 3 and the cock 1.
A ceramic material capable of sampling, characterized in that a cock 1 is configured to always press against the sheet surface of a sheet 2, and a sample collection port 6 is provided in the sheet 2 in a direction substantially perpendicular to the fluid passage hole 21 thereof. Manufactured valve. (2) The ceramic valve according to claim 1, wherein the surface or seat surface of the cock 1 is provided with at least one groove 12 that goes around the tapered surface. (3) The ceramic valve according to claim 1, in which a spring having a weaker force is placed below the cock 1 and facing the upper spring 5. (4) The ceramic valve according to claim 1, wherein a gas inlet 7 or a sample extrusion port is provided on the seat 2 at a position facing the sample collection port 6 across the cock 1. (5) A bolt 8 is provided on the seat 2 at a position facing the stem 3 with the cock 1 in between, so that the cock 1 can be pushed up by the forward movement of the bolt 8.
Ceramic valve.