Is there a DN20 electric butterfly valve?

Which is the best manufacturer of valves in Shanghai? There are many valve manufacturers in Shanghai, specifically which one is the best, in fact, it is very difficult, this depends on where you can evaluate it conveniently, each manufacturer produces different valve products, and the fields involved are also very different, for example, some are doing water systems, some are doing industrial systems, and industrial systems are divided into many fields, such as: electric power, chemical industry, petroleum, pharmaceuticals and many other fields.

Here is a brief introduction to a few companies, Shanghai Qizhong valve in the field of water system, Suzhou Neway valve, Shanghai Guanlong valve this unit is not bad, industrial valve field can also be.

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be one of the top brands in the valve industry: water system valves and industrial valves The following more influential first-line brands can be used as a reference, and the following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only:

Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Suyan, 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.

It depends on what process system you use, some of the food industry produces, and other industries can generally do it with a minimum of 25 calibers. Hope it helps.

In the water supply system, the electric ball valve can be used to control the switch, or the solenoid valve can also be used instead.

Summary. Hello dear, inconsistent. The size of the DN250 pneumatic control butterfly valve is larger than that of the DN250 pneumatic butterfly valve, as it requires the installation of a controller and other components, so the size will be larger.

Hello dear, inconsistent. The size of the DN250 pneumatic adjustable butterfly valve is larger than that of the DN250 pneumatic butterfly valve, because the control and other components need to be installed on the Chunchai Bridge, so the size will be larger.

Extended informationButterfly valve, also known as flap valve, is a simple structure of the control valve, which can be used for the switch control of the medium before the failure of the low-pressure pipeline butterfly valve refers to the closing part (disc or butterfly plate) for the disc, around the valve shaft rotation to achieve opening and closing of a kind of valve. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurries, oils, liquid metals and radioactive media. It mainly plays the role of cutting and throttling on the pipeline.

The opening and closing part of the butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve the purpose of opening and closing or adjusting. Butterfly valve is a kind of valve that uses a disc opening and closing part to reciprocate about 90° to open, close or adjust the flow rate of the medium. The butterfly valve not only has simple structure, small size, light weight, low material consumption, small installation size, small driving torque, simple and fast operation, but also has good flow regulation function and closing sealing characteristics at the same time, and is one of the fastest growing valve varieties in the past ten years.

Butterfly valves are widely used. The variety and quantity of its use continue to expand, and develop to high temperature, high pressure, large diameter, high tightness, long life, excellent regulation characteristics, and multi-function of one valve. Its reliability and other performance indicators have reached a high level.

DN1000 represents the nominal diameter of the electric butterfly valve and the nominal pressure of the electric butterfly valve. The opening and closing of the butterfly valve is controlled by a power signal. It can be used as a shut-off valve, control valve and check valve for piping systems.

With manual control device, once the power failure occurs, it can be temporarily operated manually, so as not to affect the use.

The shape is roughly what the picture looks like above, and the specific dimensions are as follows.

dn：200 d：320 d1：

280 l：152 h：960 h1：

352 h2：480 b：22 n-d：

The flange connection size can be modified according to the customer's site or requirements.

DN20 is a representation of the nominal diameter of the steel pipe, and the nominal diameter is the approximate inner diameter value. DE20 is an expression of the diameter of the plastic pipe, which is an approximate outer diameter.

The globe valve, also known as the shut-off valve, is a forced sealing valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface not to leak. When the medium enters the valve from the bottom of the valve disc, the resistance that needs to be overcome by the operating force is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium, and the force of closing the valve is greater than the force of opening the valve, so the diameter of the valve stem should be larger, otherwise the failure of the top bend of the valve stem will occur. According to the connection method, it is divided into three types:

Flange connection, thread connection, welded connection. After the appearance of the self-sealing valve, the medium flow direction of the globe valve is changed from the top of the disc to enter the valve cavity, at this time, under the action of medium pressure, the force of closing the valve is small, and the force of opening the valve is large, and the diameter of the valve stem can be reduced accordingly. At the same time, under the action of the medium, this form of valve is also tighter.

China's valve "three to give" has stipulated that the flow direction of the globe valve is all top-down. When the globe valve is opened, the opening height of the disc is 25% to 30% of the nominal diameter. The maximum flow rate has been reached, indicating that the valve has reached the fully open position.

Therefore, the fully open position of the globe valve should be determined by the stroke of the disc.

It's different. DE specifically refers to the nominal outer diameter of plastic pipe fittings.

DN is a common diameter for all pipes and fittings.

DN20 should be equal to DE32

DN and DE are two specifications, as shown in the table below.

From: Yuanda Zhengzhou Office.

The DN20 valve is and 2 points, in addition to other specifications.

The DN20 valve is a 20 mm (diameter) valve nucleus that is usually used to control the flow of water valves. DN20 valves are available in a variety of sizes to meet the needs of different mu reforms, commonly used and 2 points, in addition to other specifications.

The DN20 valve works on the principle that when the valve on the piston rod is closed, the piston rod will transfer the pressure to the tank and quickly close the valve. When the valve on the piston rod is opened, the piston rod distributes water pressure to open the valve.

DN20 valve replacement method:

Replacing the DN20 valve requires some tools, first disconnect the water source, then open the valve to completely drain the water flow, and then use a piston rod screwdriver and a handle rod wrench to remove the piston rod and remove the old valve. Next, put the new valve in, use the chute screw to hold the valve in place, and hold the clamp ring, and use the handle bar to clamp it in place. Finally, turn on the water source, adjust the valve to the desired position, check the working condition, ensure that there is no leakage, and replace it.