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**Emergency Shut-off Valve Principle**
Yongjia County Tianhong Valve's shut-off valve series includes emergency shut-off valves, gas shut-off valves, quick shut-off valves, pneumatic shut-off valves, and electric shut-off valves. These valves are designed to control the flow, switching, or cutoff of fluids within process pipelines.
**Features**
The emergency shut-off valve is known for its excellent technical performance, low pressure loss, and high reliability. It is ideal for use with flammable gases such as natural gas, liquefied petroleum gas (LPG), and other similar media. This type of valve is widely applied in gas pipeline networks, gas heating plants, boiler rooms, and residential facilities.
**Function and Working Principle**
The gas emergency shut-off valve is a normally open solenoid valve that operates on a pulse trigger mechanism. It features an automatic self-locking function during accidents and requires manual reset after the issue is resolved.
**Technical Parameters**
- **Price**: Varies depending on size, material, and pressure; prices are not publicly listed.
- **Connection Type**: Flanged connection
- **Actuation Modes**: Pneumatic, electric, hydraulic
- **Size Range**: DN15 to DN300
- **Pressure Range**: 1.0MPa to 16MPa
- **Temperature Range**: -20°C to 600°C
- **Materials**: Carbon steel, stainless steel
**Applications**
1. **Gas Detection Systems**: Connected to flammable gas leak detectors. When a leak is detected, it automatically closes the main gas supply valve, preventing potential accidents.
2. **Thermal Equipment Safety**: Linked to temperature or pressure controllers. If the set limit is exceeded, the valve quickly cuts off the gas supply.
3. **Fire Alarm Systems**: Integrated with fire alarm systems in high-rise buildings. During a fire, the gas supply is automatically cut off to prevent explosions.
4. **Central Control Systems**: The ZCR gas emergency shut-off valve can be centrally controlled from a control room, allowing remote shutdown during emergencies.
**Working Principle**
Under normal operation, the valve remains open, and the solenoid coil is de-energized, consuming no power. In case of an emergency, the coil is briefly energized, causing the valve to close rapidly and lock into place. Even if power is removed, the valve remains closed until manually reset.
The valve uses a pilot-operated design, making it easy to open even at pressures up to 6 bar. For larger diameters (over DN125), a lever handle is used to make operation more efficient and faster.
**Manual Reset**
Once the emergency has been resolved, staff can manually reopen the valve to restore gas supply.
**Additional Options**
A normally closed emergency shut-off valve with power-off functionality is also available upon request.
If you need an emergency shut-off valve, please contact Yongjia Tianhong Valve directly for more information.
This article is reproduced from: http://news.chinawj.com.cn