DE2426632A1 - Temperature sensitive flow shut down valve - has poppet held open by end cap that bursts at predetermined temperature - Google Patents

Abstract

A flow control valve has a temperature sensitive element that results in shut down in the event of fire hazard. Under normal conditions flow passes from inlet to outlet over an orifice formed between a poppet (3) and a seat (8) machined in the valve body. The poppet is held away from the seat by a stem (3a), which is forced by a screwed end cap (2) against a compression spring (4). The end cap is manufactured from a material that will burst at a predetermined temperature (approximately 300 deg.C). The poppet spindle will force through the cap and the compression spring securely holds the poppet against the seat to prevent flow through the valve.

Description

Temperature-sensitive safety shut-off valve

The invention relates to safety shut-off valves, in particular of the check valve type.

With conventional fire safety devices V7erden im In the event of a fire, pipelines through temperature-sensitive valves or through melt plugs, that is to say Efcopfen, which deform at a relatively low temperature and burst or be destroyed and collapse and thus the pipeline and isolate the liquid contained therein from the fire, separated. The temperature-sensitive valves are complex and the fusible plug valves are difficult to manufacture, their functionality cannot be easily checked after installation and are difficult to adjust.

The invention solves the problem of the safety barrier a temperature-sensitive safety shut-off valve with a preloaded in the closed position and a temperature-sensitive one Element held in the open position valve head with valve spindle in that the valve spindle of the valve disk is supported in the opening position by a cap that is attached to the valve housing and is made of a material, which at a lower temperature than the material

509850/0185

the valve housing is deformed and is or is destroyed, wherein the cap is at the same time a part of the valve housing.

Advantageous refinements result from the subclaims.

The cap may be made of a metal are made with low melting point than the valve housing or a softening at elevated temperatures plastic, may be made during the valve housing of gray cast iron, so that the cap zusai about 3 00 ⁰ C? .Inenfällt while the gray cast iron temperatures resists, which are a few hundred degrees larger.

An embodiment of the invention is described with the aid of a drawing, which shows:

1 shows a fire safety shut-off valve with a melt cap from underneath;

FIG. 2 shows a cross section through the valve, and FIG. 3 shows a plan view of the valve.

Since the safety shut-off valve consists of the housing 1, which is made of gray cast iron or another material that ^{is resistant up to and above about 800 0} C, a closure cap 5, which consists of the same or similar material as the housing and is screwed onto the housing and the Cap 2, - which is opposite the closure cap and in which the valve disk 3 is mounted.

A valve spring 4 is between the cap 5 and the valve disk 3 attached and ensures a constant load on the valve plate in the direction of the valve seat 8 and thus also loads the Melt cap on which the valve disc rests centrally.

509850 / 018S

The valve spindle 3a is through on the Schnielz cap side a seal 7 and gland 6 sealed in a conventional manner.

The valve plate or valve body is designed so that it sits in the closed position in the valve seat 8 and the valve keeps closed.

The valve body can either be designed in such a way that the valve is supported by its own weight or with the aid of the compression spring 4 in FIG. 2 is actuated.

The function of the valve is as follows:

In the event of a fire near the valve, the cap will. 2 at a predetermined temperature, e.g. B. about 300 ⁰ C, destroyed, so that the valve spindle 3a and the valve plate 3 move under the pressure of the spring 4 down against the valve seat 8 and close the channel 9 scniii.

Expectations

509850/0185

Claims (7)

Λ N S P R Ü C H E 1 _v Tempera Lure.iapfindliches safety shut with "a ^1-biased into the closed position and inthe by a temperature sensitive element opening position held valve plate with the valve stem, characterized in that the valve spindle (3a) of the valve disc (3) at a to the valve housing fluddicht fixed cap ( 2) is supported in the open position, which consists of a material which deforms and bursts or destroys v. ^R at a lower temperature than the material of the valve housing, wherein the cap is at the same time a part of the valve housing. 2. Safety shut-off valve according to claim 1, characterized in that the material from which the cap (2) is made, has a lower melting point than the material of the valve housing. 3. Safety shut-off valve according to claim 1, characterized in that the material from which the cap (2) is made of a plastic that softens at elevated temperature. 4. Safety shut-off valve according to one of claims 1 to 3, characterized in that the valve housing consists of Is made of gray cast iron. 5. Safety shut-off valve according to one of claims 1 to 4, characterized in that the valve spindle (3a) is mounted on one side in the cap (2) and on the other side carries the valve disk (3) and its center line coincides with the center line of the valve seat (8). 6. Safety shut-off valve according to one of claims 1 to 5, characterized in that a spring (4) den 5098 5 0/0185 The valve disk (3) pushes into the valve seat (8) and into the valve seat holds when the cap (2) melts and is destroyed. 7. Safety shut-off valve according to claim 6, characterized in that the spring (4) between a part of the valve housing, esp. A closure cap (5), and the valve plate is mounted. 1058 509850/0185 Blank page