Chemical plant valve type and application place (with type efficacy)

Chemical plant valve type and application place (with type efficacy)

After the invention of steam engines, in the past twenty or thirty years, because of the necessity of crude oil, chemical plants, power plants, metallurgical industry, ships, nuclear power generation, aerospace and other fields, better provisions have been clearly put forward for valves, and industrial production valves are also diverse in types. Like valve to introduce the chemical plant valve type application site and efficacy.

A chemical plant valve type and application

1. Categorize according to efficacy and application field

(1) disconnect valve: the cut-off valve is also known as the cable digital TELEVISION valve, and its effect is to access or disconnect the medium in the pipeline. Cut-off valves include globe valves, globe valves, plug valves, valves, disc valves and diaphragms.

(2) check valve: check valve is also known as throttle valve or check valve, its effect is to avoid the medium in the pipeline upstream. Centrifugal pump hygroscopic off pump bottom valve also belongs to the check valve class.

(3) valve: the function of safety valve class is to avoid the working pressure of the medium in the pipeline or equipment is higher than the specified value, so as to achieve the goal of safety protection.

(4) regulating valve: regulating valve class includes regulating valve, one-way throttle valve and pressure regulating valve, its effect is to adjust the working pressure of the medium, total flow and other three.

(5) separation valve: the shunt valve category includes a variety of multi-way valves and steam traps, etc., its effect is to dispatch, separate out or mix the medium in the pipeline.

2. Classification by pound class

(1) Vacuum valve: refers to the valve whose pressure is less than standard atmospheric pressure.

(2) Low voltage valve: refers to the pound class PN ¡Ü 1.6mpa valve.

(3) medium pressure valve: refers to the nominal pressure PN is 2.5, 4.0, 6.4Mpa valve.

(4) High pressure valve: refers to the valve with working pressure PN of 10 ~ 80Mpa.

(5) high pressure valve: refers to the valve of PN¡Ý100Mpa.

3. Classify according to operating temperature

(1) low temperature valve: for medium operating temperature t<-100¡æ valve. < p=”">

(2) low temperature valve: medium operating temperature -100¡æ¡Ü T ¡Ü-40¡æ valve.

(3) Normal temperature valve: medium operating temperature -40¡æ¡Ü T ¡Ü120¡æ valve.

(4) Medium temperature valve: for medium operating temperature of 120¡æ

(5) high temperature valve: for medium operating temperature T >450¡æ valve.

4. Categorize according to the promotion form

(1) Automatic valve is not external force to promote, but with the power of the medium itself to make the valve position of the valve. Such as valve, pressure regulating valve, steam trap, check valve, automatic control valve and so on.

(2) Driving force control valve: driving force control valve can use a variety of power devices to promote.

Electric control valve: relying on power engineering to promote the valve.

Pneumatic valve: valve driven by air compression.

Hydraulic valve: valve driven by the pressure of a liquid such as oil.

In addition, there are also the components of the above categories of driving methods, such as gas-electric regulating valves.

(3) Manual valve: manual valve depends on the spindle, rocker, rod bar, sprocket chain, by human resources to control the valve posture. When the valve opening and closing torque is relatively large, the wheel or worm gear reducer can be set between the spindle and the seat. If necessary, cardan joints and rotating shafts can also be used for long-distance practical operation.

5, according to the nominal diameter diameter classification

(1) Small diameter valve: nominal diameter DN¡Ü40mm valve.

(2) Medium diameter valve: nominal diameter DN of 50 ~ 300mm valve.

(3) Large diameter valve: nominal diameter valve DN of 350 ~ 1200mm valve.

(4) Oversized valve: the valve with nominal diameter DN¡Ý1400mm.

6. Categorize according to structure type

(1) valve shape: the opening and closing parts (piston valve) are driven by the seat along the axis of the high-pressure gate valve to adjust the fitness movement;

(2) plug valve shape: the opening and closing parts (globe valve) are pushed by the valve seat along the vertical bisecting high pressure gate valve axis for adjusting fitness movement;

(3) plug valve: opening and closing parts (cone plug or ball) tightly around its axis rotation;

(4) spin valve: the opening and closing parts (piston valve) tightly around the shaft outside the seat rotation;

(5) butterfly line: the opening and closing parts (disk) rotate tightly around the fixed fixed shaft in the high pressure gate valve;

(6) Rotary plate pump line: the opening and closing parts are rolling in the direction of vertical bisector safety channel.

7. Categorize according to connection mode

(1) Flanged connection valve: the valve body contains thread or pipe thread, connected with the pipe flange.

(2) Flanged connection valve: the valve body contains flange plate, connected with the pipeline flange.

(3) electric welding welding connection valve: the valve body contains electric welding welding seam, and the welding pipe connection.

(4) Clamp connection valve: the valve body contains a clamp and is connected with the pipe clamp.

(5) Sleeve type joint connection valve: with the pipe selection of sleeve type joint connection.

(6) Wafer connection valve: the connection mode that the valve and the pipelines on both sides are clamped together immediately with the ground bolt.

8, according to the valve body material

(1) Metal valve: the valve body and other parts are made of metal materials. Such as pig iron valve, carbon steel valve, alloy steel valve, alloy copper valve, aluminum alloy profile valve, aluminum alloy valve, titanium valve, Monel alloy valve, etc.

(2) non-metallic valve: the valve body and other parts are made of non-metallic materials. Such as plastic valve, ceramic valve, lined valve, FRP anticorrosive valve, etc.

(3) metal material valve body lining valve: valve body appearance design for metal material, internal structure where contact with the medium is mainly surface lining, such as oil distributor, plastic valve, ceramic valve, etc..

Two, chemical plant valve efficacy

Open and close type: disconnect or communicate the fluidity of liquid in the ac pipe;

Adjusting type: adjust the total flow rate and flow speed in the tube;

Throttle valve type: make the liquid according to the valve after causing very large gas pressure;

Other types: a. fully automatic opening and closing B. maintaining certain working pressure C. steam blocking drainage pipe.