GAS VALVE WITH OUTWARDLY-OPENING VALVE CLOSURE ELEMENT

Abstract

The invention relates to a gas valve (1), comprising: a valve body (2) which is hollow-cylindrical at least in parts and which forms a sealing seat (3) over which a gas flow path (4) is conducted, a reciprocating valve closure element (5) which is accommodated at least partly in the valve body (2) and which has a plate-like end portion (6) arranged outside the valve body, (2) which end portion interacts with the sealing seat (3), a sleeve (7) which at least partially surrounds the valve body (2) and the valve closure element (5) and which, together with the plate-like end portion (6) of the valve closure element (5), delimits an annular gap (8) which forms a throttle point in the gas flow path (4) downstream of the sealing seat (3).

Claims

1. A gas valve (1), comprising: a valve body (2) which is hollow-cylindrical at least in parts and which forms a sealing seat (3) over which a gas flow path (4) is conducted, a reciprocating valve closure element (5) which is accommodated at least partly in the valve body (2) and which has a plate-like end portion (6) arranged outside the valve body, (2) wherein the plate-like end portion (6) interacts with the sealing seat (3), and a sleeve (7) which at least partially surrounds the valve body (2) and the valve closure element (5) and which, together with the plate-like end portion (6) of the valve closure element (5), delimits an annular gap (8) which forms a throttle point in the gas flow path (4) downstream of the sealing seat (3).

2. The gas valve (1) according to claim 1, characterized in that upon a maximum stroke of the valve closure element (5), a flow cross-section of the annular gap (8) is smaller than a flow cross-section between the valve body (2) and the valve closure element (5) in a region of the sealing seat (3).

3. The gas valve (1) according to claim 1, characterized in that the flow cross-section of the annular gap (8) is the same over an entire stroke of the valve closure element (5).

4. The gas valve (1) according to claim 1, characterized in that the gas flow path (4) is conducted through the valve body (2) over the sealing seat (3) and the annular gap (8) into a chamber (9), which is delimited by the sleeve (7).

5. The gas valve (1) according to claim 1, characterized in that, on an end side, the sleeve (7) forms at least one inflation opening (10) for creating a gas jet, a flow cross-section of said inflation opening being greater than a flow cross-section of the annular gap (8).

6. The gas valve (1) according to claim 5, characterized in that the inflation opening (10) is delimited by at least one flow conduction surface (11), which is aligned at an angle to a longitudinal axis (A) of the gas valve (1).

7. The gas valve (1) according to claim 1, characterized in that the sealing seat (3) is tapered and opens towards the plate-like end portion (6) of the valve closure element (5).

8. The gas valve (1) according to claim 1, characterized in that the plate-like end portion (6) forms a sealing surface (12) which interacts with the sealing seat (3).

9. The gas valve (1) according to claim 1, characterized in that a bolt-like or needle-like portion (13) is connected to the plate-like end portion (6), via which the valve closure element (5) is guided.

10. The gas valve (1) according to claim 8, characterized in that the sealing surface (12) is rounded.

11. The gas valve (1) according to claim 2, characterized in that the flow cross-section of the annular gap (8) is the same over an entire stroke of the valve closure element (5).

12. The gas valve (1) according to claim 11, characterized in that the gas flow path (4) is conducted through the valve body (2) over the sealing seat (3) and the annular gap (8) into a chamber (9), which is delimited by the sleeve (7).

13. The gas valve (1) according to claim 12, characterized in that, on an end side, the sleeve (7) forms at least one inflation opening (10) for creating a gas jet, a flow cross-section of said inflation opening being greater than a flow cross-section of the annular gap (8).

14. The gas valve (1) according to claim 13, characterized in that the inflation opening (10) is delimited by at least one flow conduction surface (11), which is aligned at an angle to a longitudinal axis (A) of the gas valve (1).

15. The gas valve (1) according to claim 14, characterized in that the sealing seat (3) is tapered and opens towards the plate-like end portion (6) of the valve closure element (5).

16. The gas valve (1) according to claim 15, characterized in that the plate-like end portion (6) forms a sealing surface (12) which interacts with the sealing seat (3).

17. The gas valve (1) according to claim 16, characterized in that a bolt-like or needle-like portion (13) is connected to the plate-like end portion (6), via which the valve closure element (5) is guided.

18. The gas valve (1) according to claim 16, characterized in that the sealing surface (12) is rounded.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] A preferred embodiment of the invention is explained in further detail below with reference to the accompanying drawing.

[0023] The sole drawing FIGURE shows a schematic longitudinal section through a gas valve according to the invention in the region of a sealing seat for an outwardly-opening valve closure element.

DETAILED DESCRIPTION

[0024] The gas valve 1 shown in the FIGURE comprises a valve body 2, which is formed in a hollow-cylindrical manner at least in parts. On the end side, the valve body 2 forms a sealing seat 3, over which a gas flow path 4 is conducted. In the valve body 2, a valve closure element 5 with a plate-like end portion 6 is accommodated, wherein the plate-like end portion 6 projects into a chamber 9, which is delimited by a sleeve 7 arranged on the valve body 2. This leads to the formation of an annular gap 8 between the sleeve 7 and the plate-like end portion 6 of the valve closure element 5. The flow cross-section of the annular gap 8 is smaller than the flow cross-section between the valve body 2 and the valve closure element 5 in the region of the sealing seat 3 when the gas valve 1 is fully opened, so that the annular gap 8 forms a throttle point in the gas flow path 4. This restricts the mass flow through the gas valve 1, so that the mass flow is precisely adjustable via the annular gap 8 or the surfaces delimiting the annular gap 8.

[0025] The jet shaping or jet guiding is effected independently of the adjustment of the mass flow via an inflation opening 10 provided in the sleeve 7, via which the gas located in the chamber 9 is discharged. The inflation opening 10 is delimited by a flow conduction surface 11, which is aligned obliquely to a longitudinal axis A of the gas valve 1, so that the gas jet shaped thereby is purposefully deflected. The position, shape, and size of the inflation opening can be freely selected, because the inflation opening is not used in order to adjust the mass flow. Furthermore, multiple inflation openings 10 can also be provided.

[0026] The valve closure element 5 of the gas valve 1 shown has a bolt-like or needle-like portion 13 adjacent to the plate-like end portion 6, via which the valve closure element 5 is guided in the valve body 2. The guidance ensures that the annular gap 8 between the plate-like portion 6 and the sleeve 7 has an equal width circumferentially. This is important in terms of precisely adjusting the mass flow. With the help of the guidance, in particular, an oblique position of the valve closure element 5 during opening can be prevented.

[0027] In the present case, the valve closure element 5 also experiences a type of guidance in that the sealing seat 3 is tapered and a sealing surface 12 of the valve closure element 5 formed on the plate-like end portion 6 is rounded. In this way, a self-centering of the valve closure element 5 with respect to the sealing seat 3 is achieved.