The parameters of the downward unfolding discharging valve, and how to adjust the stroke of the pneu

Performance and use of downward unwinding valve: easy to operate, no flow resistance when opened; The assembly and maintenance of the valve disc is simple, the sealing structure is reasonable, and the sealing ring is convenient and practical. Structure:

It is mainly composed of valve body, valve disc, sealing ring, valve stem, bracket, valve gland , hand wheel, flange, nut, positioning screw and other parts.

Its main parameters are: nominal diameter DN, rated flow coefficient kv of discharge valve, nominal pressure and differential pressure of discharge valve, material of valve body and components in the discharge valve, flow characteristics of discharge valve, applicable temperature of discharge valve, power supply voltage and control signal of discharge valve, whether discharge valve has accessories, etc. This type of valve should generally be installed horizontally in the pipeline.

First, nominal diameter, also known as mean outside diameter, means the symbol DN, which is the general caliber of various pipes and pipeline accessories. Pipes and pipe accessories of the same nominal diameter can be connected to each other and are interchangeable.

It is not the outer diameter or inner diameter of the pipe in the actual sense, although its value is close to or equal to the inner diameter of the pipe, in order to make the connection size of the pipe and pipe fittings unified, the nominal diameter (also known as nominal diameter, nominal diameter) is used. For example, welded steel pipes can be divided into thin-walled steel pipes, ordinary steel pipes and thickened steel pipes according to their thickness. Its nominal diameter is not the outer diameter or the inner diameter, but a nominal size approximating the inner diameter of ordinary steel pipes.

Each nominal diameter corresponds to an outer diameter, and its inner diameter value varies with the thickness. The nominal diameter can be expressed in the metric system mm or in the imperial system. The pipeline accessories are also expressed by the nominal diameter, which means the same as the seam pipe.

Two. Nominal pressure: (nominal pressure), which represents the symbol pn, the maximum allowable working pressure when applied at a certain temperature.

For the control valve of the carbon steel valve body, it refers to the maximum allowable working pressure when the application is below 200 °C; For cast iron valve bodies, refers to the maximum allowable working pressure for applications below 120; For stainless steel body control valves, this refers to the maximum allowable operating pressure for applications up to 250 °C. When the operating temperature increases, the pressure resistance of the valve body decreases. For example, a carbon steel control valve with nominal pressure is rated at 300 °C, 400 °C and 450°.

3. Weigh the pressure valve body material: cast steel, stainless steel, 316L. Working pressure, operating temperature -20 -425.

Valve diameter DN25-DN300. Connection: flange.

Transmission: manual, pneumatic. Applicable media:

Oils, acids, corrosive media, etc. Manufacturing standard: national standard.

There is a washout-resistant and corrosion-resistant sealing ring in the cavity of the valve body, which can protect the valve body from being washed out by the medium and corroded at the moment of opening the valve, and carry out special treatment on the sealing ring, so that the surface hardness reaches HRC56-62, which has the function of high wear resistance and corrosion resistance. At the same time, the design of the short-stroke disc is adopted.

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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.

Hello, pneumatic downward discharge valve is a common industrial valve, which is widely used in the conveying and discharging process of various materials. Its stroke adjustment is an important part of ensuring the normal operation of the valve.

First of all, it is necessary to confirm whether the valve is installed in the correct position and orientation, and whether the pipe connection is secure. Secondly, check whether the air source and control system are working normally, such as whether the air source pressure is stable, whether the control signal is accurate, etc.

The valve stroke can then be adjusted by adjusting the air supply pressure and control signal. Generally speaking, increasing the air pressure can increase the stroke of the valve, while decreasing the air pressure can reduce the stroke of the valve. In addition, it is also possible to adjust the valve stroke by adjusting the size and time of the control signal.

In practice, it is necessary to pay attention to the stroke of the valve should not be too large or too small, so as not to affect the flow and quality of the material. At the same time, it is also necessary to determine the best valve stroke according to the nature of the material and the conveying requirements to achieve the best discharge effect.

In short, the stroke adjustment of the pneumatic downward discharge valve needs to comprehensively consider a variety of factors, including air source pressure, control signal, material properties, etc., in order to achieve the best discharge effect.

The upward discharge valve is the valve of the upward movement of the disc to open, and the valve needs to overcome the force of the medium when it is opened, and the torque is larger than that of the closing when it is opened. The downward expansion type and plunger type discharge valve is the downward movement valve of the valve disc (plunger) to open, and the direction of movement is the same as the force of the medium when opened, so the opening torque is smaller than that of closing.

The upward expansion type is used for the discharge of materials in the reactor with the agitator discharge valve; The downward unwinding valve is used for the reactor discharging of the frame anchor agitator.

It is mainly used for bottom discharge, discharge, sampling and non-dead zone shutdown operations of reactors, storage tanks and other vessels. The bottom flange of the valve is welded to the bottom of the tank and other vessels, thus eliminating the residue of the process media that is usually present at the outlet of the vessel. According to the needs of the actual situation, the bottom of the discharge valve is designed as a flat bottom type, the valve body is V-type, and two working modes of valve disc are provided for lifting and lowering.

Performance and use of the upward discharge valve: easy to operate, free to open, flexible and reliable movement; The assembly and maintenance of the valve disc is simple, the sealing structure is reasonable, and the replacement of the sealing ring is convenient and practical. Structure:

It is mainly composed of valve body, valve disc, dense digging sealing ring, valve stem, bracket, valve gland, hand wheel, flange, nut, positioning screw and other parts.