Technical Specification

1.Standard:CJ/T 447-2014
2.Working Temperature:-10°C≤ t ≤ 40°C
3.Max Auto Self-Closing Pressure:8KPa±2KPa
4.Min Auto Self-Closing Pressure:0.8KPa±0.2KPa
5.Auto Closing Time: t ≤ 3s

Gas automatic shut-off valve with control valve Female/Male
A gas automatic shut-off valve with a control valve (female/male threads) is a safety device used in gas pipeline systems.

When encountering situations such as underpressure, overpressure, excessive flow, or gas cut-off, the gas automatic shut-off valve will automatically close and cut off the gas supply, preventing potential safety hazards such as gas leakage, flameout, and pipe disconnection. This valve features a simple structure and easy installation.

Q&A

What "magical" functions does a gas self-closing valve possess, and why is its installation necessary?

Underpressure Safety Protection:

Gas outages and underpressure situations, which often result from emergency repairs, unexpected accidents, or weather - related factors, are common. These conditions can easily lead to leakage at the user end. The gas self-closing valve automatically shuts off when a gas outage occurs or the pressure drops to 800 Pa. At this point, it cannot be manually opened, and it won't open automatically even when the gas supply resumes. It can only be opened for use when gas is available and someone manually operates it. This mechanism not only guarantees the safety of gas construction projects and boosts work efficiency but also ensures that users are free from gas leakage risks.

Overpressure Safety Protection:

As per the regulations, the normal indoor natural gas supply pressure is set at 2000 Pa. When the pressure regulating box malfunctions due to aging or is tampered with by unauthorized personnel, the gas supply pressure can rise, causing issues like flameout and hose disconnection. In such scenarios, the self-closing valve will automatically activate and close once the gas supply pressure exceeds the safe threshold.

Excessive Flow Safety Protection:

Incidents of mice biting through the hose in front of the stove are quite common. In these cases of accidental leakage, the gas flow typically exceeds the normal consumption of the gas appliance, which is referred to as excessive flow. When excessive flow occurs, the self-closing valve's micro-pressure differential sensing device moves in the direction of the gas flow. This action reduces the pressure within the valve cavity until the self-closing valve closes automatically. This enables reliable shut-off even for the slightest leaks. When the rubber hose detaches, the self-closing valve will close automatically and remain locked in the closed position, unable to be manually opened. It will stay in this closed state until the accident is resolved. Additionally, the self-closing valve can prevent the rubber hose from being ignited in case of a fire, effectively containing the spread of flames.