VALVE FOR HIGH TEMPERATURE LIQUID

Abstract

A valve for a high temperature liquid, more in particular for liquid ZnMg, wherein the valve parts are made of ceramic material and graphite to be heat-resistant against the temperature of these liquid metals.

Claims

1. A valve for high temperature liquid comprising a valve body, a valve seat, input and output connections, a valve closure member provided with a passageway, a valve cover member and a valve spindle connected to the valve closure member, wherein the parts of the valve that come into contact with the liquid are provided with a coating of a material or are made of a material that is resistant against the high temperature liquid.

2. The valve according to claim 1, wherein the valve has the coating, and wherein the coating is selected from the group consisting of graphite, BN, ZrO, Al2O3 and Si3N4.

3. The valve according to claim 2, wherein the part to which the coating is applied is made from steel, stainless steel, titanium, nickel, copper, brass or bronze.

4. The valve according to claim 1, wherein the valve closure member is made of graphite and the valve body is made of HIP BN.

5. The valve according to claim 4, wherein the valve cover member is made of HIP BN.

6. The valve according to claim 1, wherein the valve closure member and the valve body are made of graphite or tungsten.

7. The valve according to claim 1, wherein the spindle is made from steel, stainless steel, titanium, nickel, copper, brass or bronze.

8. The valve according to claim 1, wherein the high temperature liquid is a liquid containing at least one metal.

9. The valve according to claim 7, wherein the liquid is liquid ZnMg.

10. A method to operate the valve according to claim 6, wherein the valve is operated in an inert gas atmosphere.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The invention will be further explained on hand of the example shown in the drawing, which shows a schematic drawing of the valve in cross-section.

DETAILED DESCRIPTION OF THE DRAWINGS

[0026] The valve comprises a valve body 1 provided with an inlet connection 2 and an outlet connection 3 and a valve seat 4 which accommodates valve closure member 5. Valve closure member 5 is provided with a passageway which connects to inlet and outlet channels respectively when turned in a position corresponding with these channels. The valve closure member is provided with a spindle 6 which extends through valve cover member 7 and is to be operated by mechanical or electro-mechanical means. The valve closure member 5 is made from HIP BN and the valve body 1 and the valve cover member 7 from a high density graphite.

[0027] This is a two way valve but it is also possible to make a three way valve using the materials as disclosed.