Emergency shut-off valve of ammonia station
Alternative name: pneumatic emergency shut-off valve ammonia emergency shut-off valve liquid ammonia emergency shut-off valve ammonia emergency shut-off valve
Model: AQDQ421F-25C AQDQ421F-25P
Description of emergency shut-off valve of ammonia station:
The emergency shut-off valve of the ammonia station is also called the emergency shut-off valve for the station. It is a pneumatic shut-off valve with a normally closed structure. It is installed on the pipeline at the bottom of the liquid ammonia storage tank and connected with the unloading crane arm of the liquid ammonia. The tank car shall be parked at the designated position, and the hand brake shall be used to brake and stop the engine. The wheels should be heightened≥ 150mm fixed plate or cover wood shall be covered to prevent sliding. After the tank car is normal, connect the liquid phase and gas phase of the tank car with the liquid phase pipe and gas phase pipe of the unloading crane wall according to the unloading requirements, open the emergency shut-off valve on the unloading liquid phase pipe, the root valve on the ammonia unloading tank, and the outlet valve of the liquid ammonia pump in turn, and the liquid ammonia will naturally flow into the ammonia unloading tank under the pressure difference between the tank car and the ammonia unloading tank.
During unloading, the operator must wear labor protection and protective equipment, and confirm the capacity of the ammonia unloading tank through the level gauge to prevent overloading. After the unloading of liquid ammonia, stop the liquid ammonia pump first, close the liquid phase valve of the tank car, the unloading crane wall liquid phase valve, the root valve of the ammonia unloading tank, the gas phase root valve of the ammonia unloading tank, the unloading crane wall gas phase valve, and the gas phase valve of the tank car in turn, and close the emergency cut-off valve. After unloading liquid ammonia, comprehensively check all valves and instruments, and confirm that there is no abnormality. Only after the connecting pipeline has been disconnected and handled, can the liquid ammonia tanker be commanded to leave.
Technical parameters of ammonia station shut-off valve:
| Technical parameters of ammonia station shut-off valve |
| Nominal diameter | DN25~200mm |
| Connection mode | flange |
| Cylinder type | Single acting (spring return) |
| control mode | Switch type |
| Nominal pressure | PN16、PN25、PN40 |
| Air supply pressure | 0.4～0.5MPa |
| Alloy melting temperature | ≤ 80℃ |
| Supporting accessories | 24V/220V explosion-proof solenoid valve, signal feedback, air filter pressure reducing valve, connecting pipe: stainless steel |
| body material | Carbon steel (WCB), stainless steel (304316316L) |
| Sealing material | Metal hard seal (H), hard alloy (Y), PTFE (F) |
Technical specifications for pneumatic shut-off valve:
| Technical specification for station pneumatic shut-off valve |
| design basis | GB/T 12235 |
| Product identification | GB/12220 |
| Structure length | Wafer connection | GB/12221 |
| Connecting flange size | JB/T79 |
| Experiment and inspection | JB/T9092 |
During unloading, the tank car must be turned off. During unloading, it is strictly prohibited to adjust the oil, electricity, lines and maintenance and inspection of the car. Vehicle drivers and unloading supervisors shall not leave the site, and other vehicles shall not approach.
In case of the following conditions during unloading, the tank car must stop loading and unloading immediately and handle them properly: thunderstorm weather, nearby fire, liquid ammonia leakage, abnormal liquid ammonia pressure, and no unloading at night.
The loading and unloading methods of storage equipment and electrical facilities must meet the requirements of national safety standards and specifications, and reliable safety measures must be taken especially in the aspects of fire prevention, explosion prevention, waterproof, anti-static, anti heavy pressure, and anti falling and dragging.
