Classification of materials for silencing check valves, what are the types of check valves, and what

Part Name Valve Body, Valve Cover, Valve Disc Sealing Surface Rocker Pin Gasket Part Material Carbon Steel Hardfacing Carbide Carbon Steel Chrome Stainless Steel Flexible Graphite +304 Eight, Installation and Use of Silencer Check Valve.

1. Both ends of the valve passage must be blocked, and there is a dry and ventilated room. If it is stored for a long time, it should be checked frequently for corrosion.

2. The valve should be cleaned before installation, and the defects caused during transportation should be eliminated.

3. When installing, you must carefully check whether the logo and nameplate on the valve meet the requirements of use.

4. This valve is installed on the horizontal pipeline, and the valve cover is upward.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

1. Structural classification:

According to the structure, it can be divided into three types: lifting check valve, swing check valve and butterfly check valve

1) Lifting check valves are divided into vertical and horizontal types.

2) Swing-open check valves are divided into three types: single-petal type, double-valve type and multi-valve type.

3) The butterfly check valve is a straight-through type.

The above check valves can be divided into four types in connection form: threaded connection, flange connection, welded connection and clamp connection.

2. Material classification:

1) Cast iron check valve.

2) Brass check valve.

3) Stainless steel check valve.

4) Carbon steel check valve.

5) Forged steel check valve.

3. Functional classification:

1) DRVZ silent check valve.

2) DRVG silent check valve.

3) NRVR silent check valve.

4) SFCV rubber flap check valve.

5) DDCV double-flap check valve.

Valves are a very common hardware product in our lives, such as our common tap water valves. Different valves have different materials and functions. Check valve is a type of valve that is widely used in our pipeline equipment to prevent the flow of fluid in the pipeline.

What are the common check valve materials?

1. Stainless steel check valve.

The stainless steel check valve is suitable for pipelines under various working conditions such as petroleum, chemical, manufacturing, fertilizer, power industry and other working conditions with a pressure working temperature of -29 +550°, and the applicable medium is water, oil, steam, acidic medium, etc. Stainless steel swing check valve product model: H44W-16P, H44W-16R, H44W-16RL, H44W-25P, H44W-25R, H44W-25RL, H44W-40P, H44W-40R, H44W-40RL.

2. Plastic check valve.

The plastic check valve body is light in weight, strong in corrosion resistance, compact and beautiful in appearance, light in weight and easy to install, strong in corrosion resistance, wide range of applications, hygienic and non-toxic material, wear-resistant, easy to disassemble, and simple and easy to maintain. Applicable fluids: water, air, oil, corrosive chemical liquids.

For example: piping systems for pure water and raw drinking water, drainage and sewage piping systems, brine and seawater piping systems, etc. In our many industries such as acid-base and chemical solution systems.

3. Forged steel check valve.

Forged steel check valves are available in three body cover connection designs. The valve is designed according to this design form, the valve body and the valve cover are connected with bolts and nuts, and the winding gasket is made of 316 clamp flexible graphite to seal; The second design form is a welded bonnet, according to this design form of the valve, its valve body and bonnet are connected with threads, and the all-welded seal; The third is the pressure self-tightening bonnet, which is designed according to this design form, and the valve body is connected with the bonnet with threads, and the internal pressure is sealed with a self-tight ring.

Generally at the pump outlet.

Silencer 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, silencer 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).

Shanghai No. 1 nuclear valve manufacturing ****.

The silencing check valve is a kind of lifting check valve, the model is HC41X-16, the silencing check valve adopts the contour design in line with hydraulics to obtain the best streamlined waterway, the design with fluid conduction inside can ensure a small pressure loss, the silencing check valve can be quickly closed before the water flow backflow to avoid water hammer, water hammer sound and destructive impact to achieve the effect of noise elimination. It is mostly used in water supply and drainage systems, high-rise building pipe networks, etc.

1. The valve disc is designed with the shape of "bullet", and the valve body is designed with the shape of "waist drum" to improve the flow direction of the medium and reduce the flow resistance coefficient.

2. The valve adopts a short structure form, although the head loss is slightly larger than that of the lifting silent check valve, but the size is small and cheap.

3. The structure is compact, and a non-metallic lubrication sleeve is installed between the guide shaft and the guide frame, and the valve disc can be lifted flexibly and will not cause locking.

4. The skeleton rubber sealing ring is directly embedded in the valve body, which avoids the direct washing of the sealing ring by the medium for a long time, and the service life is significantly prolonged, and it is durable and durable.

5. The opening and closing stroke of the valve disc is short, which can effectively prevent water hammer.

6. It is suitable for water supply and drainage system, high-rise building pipe network, can be installed at the outlet of the pump, and the structure is slightly modified, and can be used as a suction bottom valve, but it is not suitable for sewage pipe network.

1. During the use of this valve, the medium flows in the direction of the arrow shown in the figure.

2. When the medium flows in the specified direction, the valve disc is opened by the force of the medium; When the medium is in reverse, the valve disc and the sealing surface of the valve seat are closed due to the action of the self-weight of the disc and the reverse force of the medium, so as to prevent the medium from flowing back.

3. The sealing surface of the valve body and disc is welded with stainless steel.

3. The structural length of this valve is in accordance with the provisions of GB12221-1989, and the flange connection size is in accordance with the provisions of JB T79-1994.

The internal structure and operating principle of the waterproof hammer silencer check valve at the outlet end of the water system pipeline and water pump.