What are the types of commonly used valves, structural characteristics, directionality, and their us

As we all know, the air intake system of protective ventilation is set up next to the secondary entrance, and the entrance and exit of the dust and filtration room are set in a closed passage, separated by a closed door. Because the closed passage can only be closed and isolated to achieve the purpose of anti-virus, so in the case of outdoor poisoning, the protective closed door or closed door of the closed channel shall not be opened - this brings a problem: when the ventilation mode needs to be converted from clean to isolated or from isolated to filtered when the outdoor is poisoned, how should the staff operate the closed valve in order to safely realize the conversion of the ventilation mode.

It is understood that the closed valves on the market of protective products can be divided into two types: manual closed valves and manual electric closed valves according to the driving mode. Manual type airtight valves can only be realized by manually operating the handle...

Cut-off valves are mainly used to cut off or turn on the flow of media. Including gate valves, globe valves, diaphragm valves, ball valves, plug valves, etc

Disc valves, piston valves, ball plug valves, needle instrument valves, etc.

Control valves are mainly used to regulate the flow and pressure of the medium. Including regulating valves, throttle valves, pressure reducing valves, etc.

Check valves are used to stop the backflow of media. Check valves of various constructions are included.

Diverter valves are used to separate, distribute, or mix media. Including distribution valves and traps of various structures.

Safety valves are used for safety protection in case of overpressure of the medium. Various types of safety valves are included.

Classified by main parameters.

a) Classification by pressure.

Vacuum valve A valve whose working pressure is lower than the standard atmospheric pressure.

Low pressure valve A valve whose nominal pressure pn is less than.

Medium Pressure Valve A valve with a nominal pressure of pn.

High Pressure Valve A valve with nominal pressure.

Ultra-high pressure valve A valve with a nominal pressure pn greater than 100MPa.

2) Classification according to the temperature of the medium.

High temperature valve T > 450C valve.

Medium temperature valves 120 C less than t less than 450 C valves.

Normal temperature valves -40 C less than t less than 120 C valves.

Cryogenic valves -100 C less than t less than -40 C valves.

Cryogenic valves T Valves less than -100 C.

3) Classification according to the material of the valve body.

Non-metallic material valves: such as ceramic valves, FRP valves, plastic valves.

Metal material valves: such as copper alloy valves, aluminum alloy valves, lead alloy valves, titanium alloy valves, Monel alloy valves.

Cast iron valves, carbon steel valves, cast steel valves, low alloy steel valves, high alloy steel valves.

Metal body lined valves: such as lead-lined valves, plastic-lined valves, enamel-lined valves.

Common Taxonomy.

This classification method is divided according to principle, function and structure, and is the most commonly used classification method at home and abroad. General points.

Gate valves, globe valves, throttle valves, instrument valves, plunger valves, diaphragm valves, plug valves, ball valves, butterfly valves, check valves, pressure reducing valves.

Safety valves, steam traps, regulating valves, foot valves, filters, blowdown valves, etc.

Types of valves for water systems:

Plug valves, gate valves, globe valves, ball valves are used to open or close the flow of media in pipelines.

Check valves (including foot valves) are used to automatically prevent the backflow of media in the pipeline.

Throttle valve 1 is used to regulate the flow rate of pipeline media.

Butterfly valve 1 is used to open or close the medium in the pipeline. It can also be used for adjustment.

Safety valve 1 is used in boilers, container equipment and pipelines, when the medium pressure exceeds the specified value, it can automatically eliminate the excess medium pressure to ensure the safety of production and operation.

Pressure reducing valve 1 is used to automatically reduce the pressure of the medium in the pipeline and equipment. When the medium passes through the gap of the valve disc, the resistance is generated and the pressure loss is generated, so as to achieve the purpose of decompression.

Trap 1 is used to automatically discharge condensate from steam piping to prevent steam loss or leakage.

(1) Valve body: It is the channel for the flow of the medium, which bears the pressure of the medium and the force of forced closing. The connection between the valve body and the pipeline is connected by threads.

Flange connection and welded connection.

2) Bonnet: The connection between the bonnet and the valve body includes thread connection, flange connection and self-sealing by using medium pressure.

The <> valve is a control component in the pipeline fluid transportation system, which is used to change the channel section and the direction of medium flow, and has the functions of diversion, cut-off, regulation, throttling, check, diversion or overflow pressure relief.

The valve is a kind of pipeline accessory, which is used to change the channel section and the direction of medium flow, and control the movement of the conveyed medium. Specifically, valves have the following functions:

1. Truncation: Turn on or cut off the medium in each section of the pipeline. Such as gate valve punch, globe valve, ball valve, plug valve, diaphragm valve, butterfly valve, etc.

2. Regulation: adjust the flow and pressure of the medium in the pipeline. Such as throttle valves, regulating valves, pressure reducing valves, safety valves, etc.

3. Shunt: change the flow direction of the medium in the pipeline for distribution, separation or mixing of the medium. Such as distribution valves, three-way plug valves, three-way or four-way ball valves, traps, etc.

Valves for fluid control, from the simplest globe valves to all kinds of valves used in extremely complex automatic control systems, have a wide variety of varieties and specifications, and the nominal diameter of valves ranges from very small instrument valves to industrial pipeline valves with diameters of up to 10m. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid, the working pressure of the valve can be from negative pressure to positive pressure 1000MPa ultra-high pressure, and the working temperature is from -269 ultra-low temperature to 1430 high temperature.

The control of the valve can adopt a variety of transmission modes, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic-hydraulic, electrical-hydraulic, pneumatic-hydraulic, spur gear, bevel gear drive, etc.; Under the action of pressure, temperature or other forms of sensing signals, it can act according to predetermined requirements, or simply open or close without relying on sensing signals, and the valve relies on a driving or automatic mechanism to make the opening and closing parts lift, slide, swing or slew movement, so as to change the size of its flow channel area to achieve its control function.

Here are some 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, Chaoda, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only the role of estimation and banquet reference, 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 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 changing 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.