JPS61127977A - Ball valve flow passage tube having heat resistance and abrasion resistance - Google Patents

Abstract

PURPOSE:To improve the heat resistance and abrasion resistance of a ball valve flow passage tube by applying ceramic liner containing silicon nitride, silicon carbide or high alumina for its main ingredients to the internal surface of the flow passage tube inside the ball valve. CONSTITUTION:A cylindrical or tyle shaped ceramic liner 1 is applied to the internal surface of a flow passage tube in a ball valve A and to the internal surface of the flow passage tube in a ball body (b), and also a cylindrical or tyle shaped ceramic liner 2 is fixed to the sealing surface of the ball body (b) by the aid of adhesives or heat resistant adhesives. In addition, an adhesion material 3, such as soft steel or semi-steel belleville spring, is located between the ball body (b) and the ceramic liner 2 to be stuck to the sealing surface so that these are sufficiently stuck to each other. The material for the ceramic liner is to be a ceramic containing silicon nitride, silicon carbide or high alumina for its main ingredients.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a ball valve which is most advantageous in terms of flow path loss and frictional resistance, and more specifically relates to a ball valve having heat resistance and wear resistance in the flow path pipe. It is related to.

<Prior art> Various types of valves have been used to control fluid (gas, liquid, powder or granular material) depending on the purpose. As a result, ball valves, which are the most advantageous, are often adopted, and the material of the valve body and ball of the ball valve is small, and for medium temperature and pressure, bronze,
Forged steel is used for high temperature and high pressure, and for large valves, temperature and
Bronze, cast iron, cast steel, stainless steel, special steel, etc. are used depending on the pressure.

When controlling high-temperature fluids, the valve body and ball require considerable hardness, and require materials that are heat resistant, wear resistant, and corrosion resistant.

<Problems to be solved by the invention> When conventional ball valves are used for fluids, especially powder fluid systems and high viscosity systems, friction on the flow path surface causes severe wear, resulting in extremely poor sealing performance and increased leakage. This had a major impact on the life of the ball valve.

<Means for Solving the Problems> The present invention aims to solve the above-mentioned problems, and is a ball valve with extremely excellent heat resistance and wear resistance. A heat-resistant and wear-resistant ball valve flow path pipe characterized by having a cylindrical or tile-shaped ceramic liner mainly made of silicon nitride, silicon carbide, or high alumina adhered to the circumferential surface. be.

<Example> The present invention will be described in detail below with reference to embodiments.

FIG. 1 is a cross-sectional side view of the ball valve (A) of the present invention, FIG. 2 is a cross-sectional front view showing a cylindrical ceramic, and FIG.
The figure is a cross-sectional front view showing a tile-shaped ceramic.

The present invention provides heat-resistant and
#4j! iSilicon nitride with excellent wear resistance (S i 5N4)
, silicon carbide (SiC) and high alumina (Person J!z03)
It uses ceramic as the main material and is attached with adhesive or the like.

As shown in Figure 1, a cylindrical or tile-shaped ceramic liner (1) is pasted on the inner surface of the flow path of the ball valve (A) and the inner surface of the flow path of the ball body (b), and the sealing surface of the ball body (b) is Also, cylindrical or tile-shaped ceramic liner (2
) are fixed with adhesive or heat-resistant adhesive. Furthermore, an adhesive material (3) such as a soft material or a rust-resistant disc spring is interposed between the ball body and the ceramic liner (2) which is adhered to the sealing surface in order to bring them into close contact. For example, synthetic rubber, nylon, fluororesin, etc. are used as the soft material.

Function> The present invention has the above configuration, and the material of the cylindrical or tile-shaped ceramic liner is silicon nitride (Si7N).
4), silicon carbide (SiC), or high alumina (Ai)
As mentioned above, high alumina ceramics are superior in wear resistance.
Ceramics made of silicon nitride or silicon carbide have excellent heat resistance and thermal shock resistance, and examples of the main materials and properties of these ceramics are shown in Table 1.

Table 1 Note that the above-mentioned main materials such as ceramics and shapes can be variously selected depending on the application.

<Effects> As described above (according to the present invention, heat resistance and
It has many effects such as improving wear resistance and reducing the frequency of replacement and repair even under severe conditions.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of the ball valve, and FIGS. 2 and 3 are cross-sectional front views, respectively. In the figure: (A) Ball valve (a) Inner periphery of two channels (b): Pole body (1) Two cylindrical or tile-shaped ceramic liners (2): Cylindrical or tile-shaped ceramic liner (3) / adhesive material Patent applicant: Korenaga Shoji Co., Ltd. (and one other person) Agent: Noriharu Ariyoshi

Claims (1)

[Claims] 1. A heat-resistant device characterized by having a cylindrical or tile-shaped ceramic liner mainly made of silicon nitride, silicon carbide, or high alumina adhered to the inner peripheral surface of the flow path and the sealing surface inside the ball valve.・Ball valve flow pipe with wear resistance.