Fire isolation valve

It depends on the purpose for which you need the valve. Pneumatic valves come in various forms, and it is best to take a specific example for discussion. It usually remains inactive until the system pressure is no longer sufficient to counteract another force acting on the valve (such as the force exerted by the valve to stop the flow of material), at which point the valve loses control.

It depends on the requirements of your process. For example, in a heating furnace system, during an emergency, the feed valve is definitely closed. In other words, a pneumatic actuator is used, which shuts off in the event of a loss of air pressure to ensure safety.

The fire shut-off valve you mentioned is generally used in interlock systems, right? For such interlocks, it’s important to have a gas storage tank; generally, the choice depends on the specific circumstances. If it’s a pneumatic diaphragm type with a return spring and no holding valve, it will return to its original position when the air supply is lost. A position holding valve is used to maintain the valve position. If it is a pneumatic single-acting piston, it will also return to its original position; a double-acting type without a return spring will maintain the valve position. Specifically, it should be determined based on the conditions at the site and the type of valves used.

First: The shut-off valve also has an open and closed position, and it contains a spring inside. When there is no wind, switch to the open mode; switch to the closed mode when needed. Second: Important shut-off valves or larger ones are equipped with an air storage tank. The purified air flows into this tank through a one-way valve; even if the air supply is interrupted, the air stored in the tank is sufficient to operate the valve twice. Third: Fire isolation valves are generally electric. Anyway, the fire shut-off valves in my factory are electric.

There is no wind anymore; the wind shut-off valve is open, and the wind on-valve is closed.

If the wind stops, the valve opens, but the electrical signal also commands it to open – will it be controlled by the electrical signal?

This post was last edited by shiwendong on 2019-11-24 at 19:43. A fire shut-off valve is a normally open valve that is installed at the outlet of containers or tanks containing flammable gases (ammonia, gas, oils) or hazardous substances. When the temperature rises to 75°C ±5°C, or when it reaches a set temperature due to a fire, the fire shut-off valve automatically and quickly shuts off the flow of fluid in the pipeline. It is a valve that can operate automatically without the need for power or gas supply. Product features: 1. Can automatically shut off in case of a fire. 2. Fuse temperature options range from 165°F (74°C) to 360°F (182°C). 3. Materials available include carbon steel and stainless steel. 4. Valve types include ball valves and butterfly valves. 5. Connection methods: ball valve/threaded, welding, flange. Butterfly valve/welded, flange 6; applicable media: ammonia, gas, liquefied gas, methanol, oils, combustible gases/liquids 7. Components made of 304 stainless steel to ensure cleanliness during oil transportation and enhance corrosion resistance. A fire shut-off valve is a valve that can automatically detect temperature and close itself in the event of a fire. The valve remains in the open position; when the ambient temperature exceeds a certain threshold, it closes automatically, serving as a safety measure to prevent fires.

It mainly depends on the fault status. For FC/O or FL, there are mainly three types. The first type features a spring; it is a single-acting valve that uses a solenoid valve controlled by a single power source, and it returns to a safe state in the event of a power loss or loss of air pressure. The second type is a springless, double-acting valve that uses a solenoid valve controlled by a single power source; it returns to a safe state when power is lost, and remains in its original state when air supply is interrupted. The third type is a springless, double-acting valve that uses a dual-electronic control solenoid valve, remaining in its original state regardless of a power loss or air supply failure.

I don’t know; have you ever used an electronically controlled air motor? It involves installing a rotary air motor on the manual valve, which allows the valve to be controlled remotely via electricity, as well as manually using air to operate the valve. I think this is quite safe.

Question: After the fuse blows, what component is used to automatically close the valve? Is it an internal spring?