Selection of control mode of liquid ammonia emergency shut-off valve
Time: May 11, 2020 12:17:33 Source: Yonglong Valve Reading: zero second
Liquid ammonia emergency shut off valve Control mode selection
Liquid ammonia emergency shut off valve, also known as ammonia emergency shut off valve, ammonia emergency shut off valve, can be selected from pneumatic emergency shut off valve, hydraulic emergency shut off valve and electric emergency shut off valve, and suitable products can be selected according to field operation requirements. Different types of control methods are different, so it is important to correctly select the products you need.
Selection of control mode of liquid ammonia emergency shut-off valve
The shell structure of the liquid ammonia pneumatic emergency cut-off valve is a stop valve, and there are two types of ball valves. The actuator of the liquid ammonia cut-off valve structure is a straight stroke cylinder, and the actuator of the liquid ammonia ball valve structure is an angle stroke cylinder. In maintenance and replacement, attention should be paid to that the structure lengths are different. The control mode of pneumatic liquid ammonia emergency shut-off valve can be divided into normally closed type and normally open type. The normally closed type is mostly used in the connection pipeline of storage tank and tank car loading and unloading, and the normally open type is applicable to the pipeline from ammonia station or liquid ammonia cylinder to production workshop.
Supporting accessories of pneumatic emergency shut off valve include: travel switch (signal feedback device), explosion-proof solenoid valve, air filter pressure reducing valve, and manual handwheel device. The site control needs to configure the required electronic components. Brand accessories manufacturers include: Japanese SMC, American ASCO, Honeywell, Omron, Yadeke, People Instrument.
The liquid ammonia hydraulic emergency cut-off valve is a normally closed hydraulic cut-off valve, which is used together with the SB-03 manual oil pump. It is used in the ammonia station storage tank, liquefied gas filling station and tank car loading and unloading or ammonia quantitative loading system, liquid ammonia quantitative loading system, and the SB-03 manual oil pump is manually operated to open and close. The actuator of the hydraulic liquid ammonia emergency cut-off valve is equipped with a high-temperature fusible plug automatic cut-off device. When the ambient temperature reaches 70 ± 5 ℃, the fusible alloy is softened and dissolved, the cylinder oil pressure is relieved from the pressure outlet, and the valve is quickly closed, playing the role of fire prevention.
Liquid ammonia electric emergency cut-off valve is operated by AC 220V electric signal control switch, angular travel actuator, explosion-proof grade: (explosion-proof grade: Exd Ⅱ BT4, CT5), connection form: flange, thread, welding, with manual handwheel device, which can be manually switched when there is no power supply. The electric liquid ammonia emergency cut-off valve is interlocked with the SIS system of safety instrument, fire alarm system, gas leakage detector or the electric box control cabinet remotely controls the opening and closing actions.
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