Does the T303 2 square air duct check valve positive pressure system need to be installed?

The check valve of the air duct is installed in the air conditioner or pipeline, and the blades lift the airflow smoothly when the fan is running; The valve blades are closed when the fan is stopped, preventing gas from backflowing. However, it is required that the wind speed in the air duct should not be less than 8m s. (It can be made into explosion-proof type and pneumatic type).

Check valve refers to the valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the medium from backflowing, also known as check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium.

Material. 1.Cast iron check valve.

2.Brass check valve.

3.Stainless steel check valve.

4.Carbon steel check valve.

5.Forged steel check valve.

Check valve refers to the valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the medium from backflowing, also known as check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium. Check valves can also be used on lines that supply auxiliary systems where pressure may rise above the system pressure.

Check valves can be mainly divided into swing-type check valves (rotating according to the center of gravity) and lifting check valves (moving along the axis).

Check valves are this type of valve that allows the flow of media in only one direction and prevents it from flowing in the opposite direction. Usually this kind of valve works automatically, and the disc opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-closing disc of the disc act on the valve seat, thus cutting off the flow.

In order to prevent the exhaust fan from blowing in after it stops, the wind blows in the opposite direction.

The air duct check valve is installed in the ventilation or air conditioning pipeline, the valve is opened when the fan is running, the airflow passes smoothly, and the valve is closed when the fan is stopped to prevent the airflow from reversing.

Check valve, flow in one direction, prevent negative pressure backflow.

Consider the need to install, normally open air outlet, check valve is there, but there is no 70 fire damper, unless the pressurized fan is set in the fan room, the fire damper is set.

A check valve is added directly to the air duct of the outdoor exhaust to prevent negative pressure and air backfilling in the room on windy days.

The check valve needs a certain wind pressure to open, generally greater than 8 meters of wind speed, some fans are positive pressure fans, some are negative pressure fans, which is the determining condition of the installation position.

A check valve is also known as a check valve. As the name suggests, the fluid in the system can only flow in one direction, and it is forbidden to flow in the opposite direction. In the design of fire and smoke exhaust systems, check valves are often used when two systems share a wind shaft or a wind balance grip pipe, etc., and the function of the check valve is to prevent the flue gas from entering the other system when only one of the two systems is running.

I don't know if what you're talking about is this case, but you can discuss and learn.

Roof ventilator - fire damper - or check valve - positive pressure air outlet - self-hanging louver.

Positive pressure air supply outlets, fans and other ventilation products.

Air inlet ---positive pressure fan--- air duct or air duct --- air supply outlet (fire damper + louver tuyere).

Fire damper and blower interlocking; The blower is interlocked.

Check valves are generally installed at the air outlet of the fanto prevent air backflow, some are installedConnection with the machine, some are installed onJunction with the wall.

The air duct check valve is a kind of valve that opens and closes with a circular disc and relies on its own weight and medium pressure to block the backflow of the medium, which is an automatic valve. The disc of the check valve opens under fluid pressure and the fluid flows from the inlet side to the outlet side. When the pressure on the inlet side is lower than that on the outlet side, the disc automatically closes under the action of factors such as fluid pressure difference and its own gravity to prevent the fluid from backflowing.

The type of check valve.

1. Lifting check valve.

The structure of the lifting check valve is generally similar to that of the globe valve, and its disc moves in a line along the channel, which is reliable in action, but the fluid resistance is large, and it is suitable for light and small diameter occasions. Lift check valves are available in both straight-through and vertical versions. Straight-through lift check valves can generally only be installed in horizontal pipelines, while vertical lift check valves are generally installed in vertical pipelines.

2. Swing-open check valve.

The disc of the swing check valve rotates around the rotating shaft. Its fluid resistance is generally less than that of the lifting check valve, and it is suitable for larger diameter occasions. According to the number of discs, the swing check valve can be divided into three types: single valve swing type, double valve swing type and multi-valve swing type.

Single-lobe swing check valves are generally suitable for medium caliber applications. When a single-valve swing-open check valve is selected for large-diameter pipelines, a slow-closing check valve that can reduce water hammer pressure is used to reduce the water hammer pressure. The double-flap swing check valve is suitable for large and medium diameter pipelines.

Multi-lobe swing check valves are suitable for large diameter pipelines.

3. Butterfly check valve.

The structure of a butterfly check valve is similar to that of a butterfly valve. Its structure is simple, the flow resistance is small, and the water hammer pressure is also small.

4. Diaphragm check valve.

Diaphragm check valve has a variety of structural forms, all of which use diaphragm as the opening and closing parts, due to its good waterproof hammer performance, simple structure and low cost. However, the operating temperature and pressure of diaphragm check valves are limited by the diaphragm material.

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