JPS609496Y2 - Ceramic ball valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic ball valve that is disposed in a fluid circuit of general equipment and controls the flow rate in the circuit.

Generally, conventional ball valves constructed of stainless steel, brass, or other metals are mechanically robust and can have a sufficiently long life when used to open and close normal liquid flow paths.

However, metal ball valves have the disadvantage that they are extremely susceptible to chemicals, especially acids and alkaline liquids with strong corrosion resistance, and are also inferior in wear resistance.

Further, Teflon, synthetic rubber, etc. are usually used as materials for the valve seat of a ball valve, but these have the disadvantage that they cannot withstand the temperature when handling high-temperature fluids.

On the other hand, in order to improve the corrosion resistance of ball valves, the parts that come in contact with liquid, such as the valve body and valve seat, are made of porcelain, and the porcelain valve body is covered with adhesive using a metal protector that also serves as a flange for connecting piping. There is a valve with a structure in which it is tightened and covered from both sides by interposing it (Utility Model Publication No. 39-25538).

However, in the ball valve, the porcelain valve body is covered from both sides with a metal protector that also serves as a piping connection flange, and the porcelain side valve body and the metal protector are fixed with adhesive. Therefore, if an external force is applied to the metal protector and both metal protectors are pulled outward, the porcelain member (valve body) may become loose and fluid may leak. There is a problem.

The technical problem that this invention aims to solve is to further improve the corrosion resistance, wear resistance, and heat resistance of ball valves, as well as to prevent loosening of the valve body assembly and increase mechanical strength. This is a point that can be further enhanced.

In order to solve the above technical problem, the technical means provided in the present invention is to provide a ball valve with a ceramic acid valve seat and a ceramic acid ball valve body thereon,
A ceramic acid valve box that can contain a ball valve body and a valve seat, a valve rod that is installed in the valve body and rotates the ball valve body, and a ceramic acid valve body that holds the ball valve body, valve seat, and valve body from both sides. a socket, a corrosion-resistant and heat-resistant elastic body interposed between the valve seat and the socket to tightly fit the valve seat to the ball valve body, and a metal flange for piping attachment fitted to the outer circumferential step of each socket; Bolts and nuts that tighten both sockets and assemble the ball valve body, valve seat, and valve box together; and bolts and nuts that can accommodate these components and whose inner peripheral edges are threaded into the outer peripheral surface of the metal flange for piping installation. The main feature is that it is constructed from a matching metal cylinder.

In the present invention, the parts that come into contact with fluid, that is, the ball valve body, valve seat, socket, and valve box, are all made of ceramic acid, so they have excellent corrosion resistance, abrasion resistance, and heat resistance.

In addition, since the ceramic acid valve box, etc. is covered with a metal cylinder and flange, the metal cylinder, etc. will absorb the tensile force and impact force, and the scales will be able to withstand the impact force sufficiently. I can do it.

Furthermore, the ball valve body, valve seat, and valve box are assembled using bolts and nuts regardless of the metal flange for piping installation, and the outside is covered with a metal cylinder and metal flange. Even if tensile stress is applied to the metal flange or the like, the assembly of the ceramic valve body will not come loose.

Furthermore, since an elastic body is interposed between the socket and the valve seat, the left and right valve seats receive pressing force and fit tightly against the ball valve body, improving sealing performance.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of this ceramic ball valve, and FIG. 2 is a side view of the ceramic ball valve.

The ball valve body 6 in the center of FIG. 2 is a ball-shaped ceramic valve body having a hole in the horizontal direction.

On both sides of the valve body 6, an annular valve seat 8 that tightly fits thereon is supported and abutted against the inner surface of the annular valve body 3.

Reference numerals 1 and 2 are sockets that are approximately disk-shaped and have a through hole in the center.

The outer circumferential edge of this socket is formed to be stepped, and annular metal flanges 4 and 5 for attaching pipes are fitted to this outer circumferential step.

The metal flanges 4 and 5 for attaching the pipes are screwed and fixed to a metal cylinder 7 surrounding the outer periphery.

Through holes 22 and 23 are formed in the flanges 4 and 5, into which hexagon socket head bolts 15 are installed.

In other words, sockets 1 and 2 are connected to this hexagon socket head bolt 15.
It is firmly connected by a nut 16 screwed onto this end.

The socket 1.2 then clamps and fixes the valve body 3.

17 is a sheet packing made of a corrosion-resistant and heat-resistant material such as asbestos.

A circumferential groove 25 is carved on the inner surface of the socket 1, and the circumferential groove 2
A corrosion-resistant and heat-resistant metal elastic body, that is, a stainless steel Nosfring 10 is interposed between the valve seat 5 and the valve seat 8.

The left valve seat 8 is constantly brought into tight contact with the ball valve body 6 under the pressure of the spring 1o.

Moreover, this ceramic ball valve is assembled in the following order.

That is, the nut 16 is inserted into the through hole 22 of one flange 4, and the flange 4 is screwed onto the inner peripheral edge of the cylinder 7.

Next, the socket 1 is fitted into the flange 4, and the spring 10 is inserted into the circumferential groove 25 of the socket 1.

Then, a pre-assembled combination of the valve box 3, valve stem 9, ball valve body 6, valve seat 8, etc. is inserted into the cylinder 7, and one side of the valve box 3 is fitted into the socket 1.

Thereafter, the other socket 2 is fitted into the other side of the valve box 3, and the other flange 5 is screwed onto the inner peripheral edge of the cylinder 7.

Finally, the through holes 22 and 23 of the flanges 4 and 5 and the nut 1
A bolt 15 is inserted into the hole 6 to tighten the ceramic member, that is, the socket 1, 2, etc.

The ceramic ball valve is assembled in this way.

The tip of the valve rod 9 becomes a projection 28, which is inserted into a horizontal groove 29 of the ball valve body 6.

A flange 21 is formed at the lower part of the valve stem 9, and abuts against the inner surface of the valve case 3 via a packing 14' to prevent removal.

The upper part of the valve stem 9 is threaded, and a lock nut 13 is screwed into this thread.

12 is a gasket for maintaining watertightness between the valve box 3 and the valve stem 9.

(2) The gasket 12 has adapters 11 on the upper and lower sides, and is pushed down from above by the lock nut 13 via the gasket 14.

By rotating the valve stem 9, the valve can be opened and closed.

A handle is further provided above the valve stem 9 and is manually operated.

In addition, an actuator 19 is attached as shown by the broken line,
The valve stem 9 may be driven to rotate via the connector 20.

In this case, since the cylinder 7 is made of metal, the bracket 18,
Installing the actuator 19 is easy.

The cross section marked with the Nakamura point in Figure 2 shows that it is made of ceramic.

That is, the ball valve body 6, the valve seat 8, the valve box 3, and the sockets 1 and 2 are made of ceramic.

The flanges 4, 5 and cylinder 7 to which tension, bending stress, etc. are applied are made of stainless steel or other metal.

Reference numeral 30 denotes a pipe mounting screw hole bored in the flange 5.

A mounting bolt 31 is inserted into a mounting hole of a flange of a pipe to be connected, and a nut (not shown) is screwed onto the bolt to connect the flange of the pipe to the flanges 4 and 5 of the valve.

In this invention, the parts of the valve that come in contact with the fluid, that is, the ball valve body, valve seat, socket, and valve box, are all made of ceramic, so they have excellent corrosion resistance, abrasion resistance, and heat resistance. .

It is a suitable valve for fluids containing corrosive chemicals, even when the fluids are at high temperatures.

In addition, the ball valve body, valve seat, and valve box are assembled by tightening both sockets with bolts and nuts, regardless of the metal flange for piping installation, and the outside is covered with a metal cylinder and metal flange. Because of this structure, even if tensile stress is applied to the flange, etc., the assembly of the ceramic valve body will not loosen due to this.

Furthermore, although ceramics are strong in compression, they are fragile in tension.

Here, the flange and cylinder, which are the parts to which tensile force is applied, are made of metal, so the characteristics of both materials are utilized to produce complementary effects.

That is, the metallic outer shell part receives the tensile force and impact force, and the ceramic members seal off the corrosive fluid.

Therefore, it has excellent corrosion resistance, abrasion resistance, and heat resistance, and can sufficiently withstand impact force.

Furthermore, since an elastic body is interposed between the socket and the valve seat, the left and right valve seats receive pressing force and are constantly brought into close contact with the ball valve body, improving sealing performance.

[Brief explanation of the drawing]

FIG. 1 is a front view of a ceramic ball valve according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional side view thereof. 1.2 is a ceramic socket, 3 is a ceramic valve box, 4 and 5 are metal flanges for piping installation, 6 is a ceramic ball valve body, 7 is a metal cylinder, 8 is a ceramic valve seat, 9 is a ceramic valve seat Valve stem, 10 is an elastic body, 15 is a bolt,
16 is Natsuto.

Claims (1)

[Scope of utility model registration request] A ceramic acid valve seat 8; A ceramic acid ball valve body 6 serving thereon; A ceramic acid valve box 3 that can house the ball valve body 6 and the valve seat 8; A ball valve body provided in the valve box 3; a valve stem 9 that rotates the valve body 6; ceramic acid sockets 1 and 2 that sandwich the ball valve body 6, the valve seat 8, and the valve box 3 from both sides; A corrosion-resistant and heat-resistant elastic body 10 that brings the seat 8 into close contact with the ball valve body 6; and each socket 1.
, 2; metal flanges 4, 5 for piping installation fitted to the outer circumferential step of the sockets 1, 2; and a ball valve body 6, by tightening both sockets 1, 2;
A bolt 15 and a nut 16 for integrally assembling the valve seat 8 and the valve box 3; a metal flange 4 that can accommodate these components and whose inner peripheral edge is for mounting the piping;
5. A ceramic ball valve characterized by comprising a metal cylinder 7 which is threadedly engaged with the outer peripheral surface of the ceramic ball valve 5.