DE2827189A1 - Mushroom-type gas non-return valve - has damping cushion with adjustable volume and is closed by spring against flange at end of stem - Google Patents

Abstract

The gas non-return valve has a damping system working with a gas cushion enclosed during the closing movement. The vol. of this cushion is adjustable. Where the valve is of the mushroom type shut by a spring acting against a flange on the end of the valve stem, the flange can form a damper piston (17) working in a cylinder (18). The base closing the end of the cylinder comprises an insert, adjustable to and from the piston in the axial direction, typically by a screwthread.

Description

ENGINE AND TURBINE UNION
FRIEDRICHSHAFEN GMBH

Friedrichshafen

check valve

The invention relates to a check valve for gases with a damping device, the kit a during the closing movement of the check valve trapped gas cushion works.

The damping device causes a reduced material stress on the moving valve parts, which at sudden closing of the check valve occurs. It is known in power cylinders that the To dampen the piston by a gas cushion enclosed before the end of the stroke. The one in the enclosed gas cushion The resulting pressure is reduced with a time delay via a spring-loaded throttle valve. The controllability of the damping effect, which is desirable in some cases, is possible with the known damping devices not reachable.

It is therefore the object of the invention to propose a solution for a check valve with a damping device

07/19/78

gri-sch 7 8 0 7

909885 / OOU

to make whose damping effect is adjustable. These The problem is solved by the characterizing feature of claim one. The advantageous embodiment of Invention results from the features of claims two to four.

The advantages achieved by the invention are in particular the space-saving construction and the fact that the damping effect can be adjusted in a simple manner and can be finely dosed.

An embodiment example of the invention is shown in the drawing and is described below. The drawing shows a cross section of a check valve.

In a housing-like expanded part 12 of a line 11 for gases a check valve is arranged, which consists of a valve basket 13, a poppet valve lh and a compression spring that closes the check valve. The compression spring If engages a collar arranged at the end of the valve stem 16, which is designed as a damper piston 17 in a cylinder 18 within the Valve basket 13 is performed. Between the damper piston 17 and a threaded insert 19 closing off the cylinder 18, a space 20 is enclosed, the volume of which can be changed by axially adjusting the threaded insert 19. In the open position of the poppet valve lh is the

Space 20 via bore 21 with the interior of the line 11

connected to equalize pressure. During the closing movement of the poppet valve 1h , a gas cushion is enclosed in space 20, which cushion the end stop of the poppet valve 14. With changing the volume of space 20 through axial ver position of the threaded insert 19 is the damper effect adjustable and can be finely dosed.

06/19/78

gri-sch 7 8 0 7

909868/0014

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Claims (1)

ENGINE AND TURBINE UNION
FRIEDRICHSHAFEN GMBH Friedriehshafen Claims Non-return valve for gases with a damping device, which works with a gas cushion trapped during the closing movement of the check valve, characterized in that the volume of the damping gas cushion is adjustable. 2. Check valve according to claim i with a poppet valve, in which a closing of the poppet valve causing compression spring rests against a collar arranged at the end of the valve stem, characterized in that that the end collar is designed as a damper piston (17) and guided in a cylinder (18) is. 3. Check valve according to claim 2, characterized in that a cylinder (I8j ^ final Bottom consists of an insert that stood in its Abc to the damper piston (17) is axially adjustable. k. Check valve according to Claim 3, characterized in that the insert has a thread which enables axial adjustability. 06/19/78 gri-sch 7 8 0 7 909885 / OOU