Flue check valve, also known as check valve, reverse flow valve, smoke prevention treasure and inner wall cover, occupies an important position in modern kitchen decoration and is an essential product for kitchen decoration. There are many kinds of flue check valves, including plastic flue check valves, stainless steel flue check valves, fire-proof flue check valves, and five-smoke-proof flue check valves. So which is better? How to choose the check valve of kitchen flue? Let's have a look. 1. Which is the flue check valve?

(1) plastic flue check valve

1, the most original flue deodorizing product, material: plastic structure. An iron column runs through the valve plate, and the valve body is square, which needs to be perforated and installed, and the smoke prevention effect is average.

2. It is a multifunctional check valve, which is made of abs plastic as a whole, and the valve plate is a whole. The base and valve body are round. There are three kinds of apertures: 150mm, 160mm and 180mm, which can be installed on glass or flue without punching holes. Stick it on. The smoke prevention effect is excellent.

3. The valve body is made of plastic, and the blade consists of two parts. This kind of range hood is generally installed inside the range hood, and the better range hoods basically have this check valve. Smoke prevention effect, medium.

(2) Stainless steel flue check valve

1 has the same principle as the original plastic check valve. The whole fuselage is made of stainless steel or stainless steel. Need to be perforated for installation. Its advantage is that it plays the role of one-way fire prevention, and the smoke prevention effect is general.

2. It is the latest snap check valve, which is made of stainless steel or stainless steel as a whole, and the hinged opening and closing sealing performance of the valve leaf is better. The installation is simpler, and the only disadvantage is one-way fire prevention. Can't meet the requirements of the National Fire Bureau.

(3) Fire flue check valve

Fire-proof flue check valve is the most reliable flue check valve product at present, which fully conforms to the regulations of the State Environmental Protection Administration and the State Fire Bureau.

Material: steel

Appearance: red paint classic fashion

Structure: the valve plate is hinged, the blade is concave and the valve body is convex, achieving super sealing performance.

Fire protection performance: brand-new fire protection design, 75-degree automatic drop fuse, simple and practical.

Installation: Embedded simple installation. Convenient and quick.

(4) Five-prevention gas extraction flue check valve

Five-prevention smoke flue check valve is the most reliable check valve product of flue exhaust passage high-grade residence, which is named after its smoke extraction effect and five-prevention effect. It is a variable pressure gas extraction flue check valve. The design of spray plate can effectively avoid the defect of poor ventilation caused by pressure and vortex under gas.

Principle: aerodynamic principle

Material: stainless steel/copper/galvanized.

Performance: fire prevention, air blocking prevention, backflow prevention, oil accumulation prevention and fault prevention.

Second, how to choose the kitchen flue check valve

1, size

First, determine the size. Now the kitchen flue is generally divided into two ways. One is the smoke exhaust method of the public flue reserved by the developer, and the other is the way that kitchen fume is directly discharged to the outside through the window without passing through the public flue. The flue check valve can be used in both ways.

Generally, the check valve size on the market is 10- 18cm, while the pipeline is generally around 16cm, so you must refer to the flue size of your own range hood before buying.

Step 2 perform

Secondly, we must have the ability to choose and identify. Don't blindly believe in brands and sales. The most important thing is to buy what suits you. When choosing to buy, you must see whether the check valve is flexible and whether the valve can be easily opened and closed. The natural wind resistance with large opening and closing angle is weak, which makes it easier to discharge oil smoke, and of course it also includes some fire prevention functions.

3. Materials

Also, be sure to pay attention to the material of check valve. Although some materials are plastic structures, high-quality abs plastics are more durable, heat-resistant and easy to clean than aluminum alloys and general metals. Of course, after a long time, there may be a lot of smoke stuck between the baffle and the structure, which makes it difficult to open the check valve and greatly reduces the efficiency. At this time, it is necessary to choose to replace it. It is better to choose a check valve with a detachable valve, which is easier to maintain and will prolong the service life of the check valve.