초록 ▼

A safety shut-off device for sections of fluid circuits, which in case of damage or the like, have to shut off from each other on safety considerations. The safety shut-off device includes at least two valves connected to each other via a control chamber. A first pressure differential with the contr

A safety shut-off device for sections of fluid circuits, which in case of damage or the like, have to shut off from each other on safety considerations. The safety shut-off device includes at least two valves connected to each other via a control chamber. A first pressure differential with the control chamber closes the valves and a second pressure differential, which is greater than the first, opens the valves.

대표청구항 ▼

The invention claimed is: 1. A safety shut-off device for sections of fluid circuits comprising at least two segmenting valves each with an annular chamber connection, a sealing taper connection and a control chamber at low pressure are provided, the control chambers of the segmenting valves are co

The invention claimed is: 1. A safety shut-off device for sections of fluid circuits comprising at least two segmenting valves each with an annular chamber connection, a sealing taper connection and a control chamber at low pressure are provided, the control chambers of the segmenting valves are connected to each other and that in each segmenting valve a stepped piston is provided and held by a sealing force element, a first pressure difference between the annular chamber connection or the sealing taper connection compared to the pressure in the control chamber closes the sealing taper connection, a second pressure difference being greater than the first pressure difference opens the sealing taper connection such that fluid can flow from the annular chamber connection to the sealing taper connection or vice versa, a non-return valve is provided over which a higher pressure in the control chamber compared with the pressure in the annular chamber connection can be relieved. 2. The safety shut-off device of claim 1 wherein the non-return valve is created by an elastomer coating on the stepped piston, which functions as non-return valve and allows the fluid to flow only for a closed stepped piston from the control chamber to the sealing taper connection, whereby an annular gap between the body and the stepped piston is provided. 3. The safety shut-off device of claim 1 wherein a number N of segmenting valves are provided in the safety shut-off device and exactly N sections are capable of being shut off from each other. 4. The safety shut-off device of claim 1 wherein the sealing force elements are springs. 5. The safety shut-off device of claim 1 provided in a refrigerant circuit to prevent the outflow of refrigerant in case of damage. 6. The safety shut-off device of claim 5 wherein sections of the refrigerant circuit to be shut off contain inner heat exchangers of an air conditioning unit or heat pump or a combined air conditioning unit/heat pump. 7. The safety shut-off device of claim 1 provided in a hydraulic circuit to segment sections thereof and prevent the outflow of refrigerant in case of damage.