What should be paid attention to before installing pipeline valves?

According to the instruction manual and packing list, first check whether the accessories of the valve are complete, and some valves should be sealed before installation, as well as whether the inside of the valve is clean, whether the manual is flexible, whether the switch can be in place, etc. In addition, attention should be paid to the direction of the medium flow of the valve and the position of the high-pressure side.

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.

This standard specifies gate valves, ball valves, check valves, and plug valves with flanged and welded connections.

That is, it is used in industrial pipelines: gate valves, ball valves, check valves, and plug valves. Want to know what.

General installation of valves First of all, check whether there are obvious problems or defects in the valves, pay attention to the specifications of the valve (pressure, temperature, material, diameter) and whether the pipeline matches, some design drawings for the positioning and installation of some valves (the valve has a special number corresponding to the drawing).

Secondly, pay attention to the direction of installation (the direction of the pipeline fluid).

As a general rule, the installed valve should be opened.

Not very clear what you want to know.

General installation of valves First of all, check whether there are obvious problems or defects in the valves, pay attention to the specifications of the valve (pressure, temperature, material, diameter) and whether the pipeline matches, some design drawings for the positioning and installation of some valves (the valve has a special number corresponding to the drawing).

Secondly, pay attention to the direction of installation (the direction of the pipeline fluid).

As a general rule, the installed valve should be opened.

Look at what valve, to be specific, welded or flanged, ball valve or gate valve or other type.

Globe valves, throttle valves, pressure reducing valves, check valves and other valves are directional, if the installation is reversed, the throttle valve will affect the use effect and life; Pressure reducing valves don't work at all, and check valves can even be dangerous.

General valves, there are direction signs on the valve body; In case not, it should be correctly identified according to the working principle of the valve.

The valve cavity of the globe valve is asymmetrical, and the fluid should be allowed to pass through the valve port from bottom to top, so that the fluid resistance is small (determined by the shape), the opening is labor-saving (due to the pressure of the medium upward), and the medium does not press the packing after closing, which is convenient for maintenance. This is why the globe valve cannot be reversed. Other valves also have their own characteristics.

The valve must be installed in a position that is easy to operate; Even if the installation is difficult for the time being, it is necessary to think about the long-term work of the operator.

It is best to take the valve handwheel and the chest (generally meters away from the operating floor), so that it is easier to open and close the valve. The handwheel of the landing valve should be facing upwards and not tilted to avoid awkward operation. The wall machine is close to the valve of the equipment, and the operator should also be allowed to stand.

It is necessary to avoid the operation of looking up to the sky, especially acid, alkali, toxic media, etc., otherwise it is very unsafe.

The gate valve should not be installed upside down (i.e., the handwheel is downward), otherwise the medium will remain in the bonnet space for a long time, which is easy to corrode the valve stem, and is contraindicated by some process requirements. It is extremely inconvenient to change the packing at the same time.

1. The pressure reducing valve should be installed upright on the horizontal pipeline, and should not be tilted in all directions.

2. When installing the lifting check valve, it is necessary to ensure that the valve disc is vertical, so that it can be lifted flexibly.

3. The swing-type check valve should be installed to ensure that the pin shaft is level, so that the swing-start is flexible.

4. Do not install the open rod gate valve underground, otherwise the exposed valve stem will be corroded due to moisture.

1. When installing the riser, first put the pipe section hoisting is aimed at the lower socket and insert the pipe end, which can not be shaken and squeezed in, and the force should be even. It is necessary to pay attention to the direction of the tee, that is, the direction of the throwing mouth, and align it with the direction of the transverse pipe.

2. Fix the riser immediately after installation, and plug the riser opening with fine stone concrete not lower than the floor mark.

3. The distance between the outside of the riser socket and the finish should be controlled at 20-50mm. An inspection opening should be set at 10m intervals on the riser. If there is a B-shaped pipe, an inspection port is arranged at the upper part of the B-shaped pipe in this layer.

4. When installing the riser, be sure to align the direction of the tee with the direction of the transverse pipe, so as not to affect the installation quality due to the deflection of the tee during installation. The height of the three-way port should be determined according to the length and slope of the transverse pipe.

5. The general pipe that extends upwards from the roof surface of the riser is called the ventilation pipe. The ventilation pipe can not be connected with the air duct and flue, and should not be located under the eaves and balconies, and should be higher than the roof, and should be greater than the maximum snow thickness.

6. After the installation of the riser is completed, cooperate with the civil engineering to fill the hole with concrete not lower than the floor slab mark, and remove the temporary support. If it is a pipeline in a high-rise building or tube well, it should be fixed with section steel according to the design requirements.

1.Understand the on-site situation, personnel training.

2.On-site installation requires equipment, as well as platform construction.

3.the quality of the construction, as well as the schedule requirements.

Plastic-lined elbows. <>

Wear-resistant pipes. <>

Install wear-resistant pipes.

(1) All kinds of valves used in ammonia systems (such as globe valves, throttle valves, constant pressure valves, check valves, safety valves, float valves, solenoid valves, electric valves) must use special products for ammonia.

2) Before installation, except for the safety valve sealed by the aluminum seal of the manufacturer, other valves must be disassembled and cleaned one by one to remove oil and rust. And carefully check its sealing performance. The method of this is:

Open and close the valve 4 5 times, then close the valve, test the leak with compressed air (or pour it into the machine from the lower inlet) and pass it if it does not leak for two hours, otherwise it cannot be used.

3) Float valves, solenoid valves, electric valves and float liquid level indication devices must be tested for their sensitivity and tightness before installation, and can only be installed after they are qualified.

4) All valves must be installed straight and the valve handle must be facing up for operation.

5) When installing all valves, attention must be paid to the flow direction of ammonia, which should be based on the valve seat, from bottom to top, and should not be reversed.

6) The safety valve is divided into high, medium and low pressure, and should not be installed wrong according to the purpose before installation, in order to facilitate maintenance, it is necessary to install a shut-off valve in front of the safety valve. The safety valve should be sealed in an open state and should not be closed.

1.Carefully check whether the valve model and specifications meet the requirements of the drawings.

2.Check whether the stem and disc are open flexibly and whether there is any jamming and skewness.

3.Check whether the valve is damaged, and whether the threads of the threaded valve are correct and intact.

4.Check whether the connection between the seat and the valve body is firm, the connection between the disc and the seat, the bonnet and the body, and the stem and disc.

5.Check whether the valve gasket, packing and fasteners (bolts) are suitable for the nature of the working medium.

6.The old or long-standing pressure reducing valve should be disassembled, and dust, sand and other debris should be cleaned with water.

7.Remove the through-mouth cap, check the degree of tightness, and the disc must be closed tightly.

Omar valve will answer for you:1It is not allowed to be thrown when handling the valve.

When stacking, carbon steel valves should be separated from stainless steel valves and non-ferrous metal valves. When the valve is hoisted, the wire rope should be tied to the connecting flange between the valve body and the valve cover, and should not be tied to the handwheel or valve stem to prevent damage to the valve stem and handwheel.

2.Open rod valves cannot be laid directly in the ground to prevent corrosion of the valve stem.

It can only be installed in a covered trench, and the valve should be installed in a location that is convenient for operation, inspection, disassembly, maintenance and operation.

3.The valve installation position should not obstruct the equipment.

The installation height should be convenient for operation and maintenance, and the valve operating handle is generally 1-1 from the ground2m is appropriate. Valves with more operations must be installed at a distance of 1 from the operating surface

When more than 8m, a fixed operating platform should be arranged, and when it must be installed above or below the operating surface, an extension rod should be set or the valve stem should be installed horizontally, and a handwheel or long-distance operating device with a transmission device should be installed at the same time. The angle of the axis of the valve transmission device should not be greater than 30 degrees, and its joint should rotate flexibly, be flexible and easy to use during operation, and the indication should be accurate. For valves with thermal deformation, the transmission should have compensating measures.

4.Place the valve vertically upwards or in the upper semicircle.

It is best to install the valve vertically upwards or the valve stem in the upper semicircle of the horizontal pipeline, but the valve stem and handwheel on the vertical pipeline must not be installed in the direction of the operation circuit. When possible, the valves should be installed as centrally as possible for ease of operation. The valves on the pipeline in the tower area above 4m above the ground should not be set outside the platform for easy installation and operation.

5.For directional valves.

For directional valves, the installation direction should be determined according to the medium flow direction of the pipeline, such as when installing the globe valve, the medium should flow from the bottom of the valve disc to the top, commonly known as low in and high out. When installing the and gate valve, the medium is allowed to flow out from either end. When installing the check valve, special attention must be paid to the flow direction of the medium to ensure that the valve disc can be automatically opened.

For swing-off check valves, ensure that the rotating pivot of the plug-in plate is installed in a horizontal position. For lifting check valves, ensure that the center line of the valve disc is perpendicular to the horizontal plane.

1. Since it is an agricultural irrigation valve, it is indispensable to have an agricultural irrigation pipeline, after all, the valve is installed on the pipeline, therefore, before installing the agricultural irrigation valve, it is first necessary to ensure that the agricultural irrigation pipeline has been installed correctly and firmly. Check the integrity of pipes and fittings, such as bolts, water-stopping rubber pads, wire mouths, etc.

2. The center line of the flange of the agricultural irrigation valve should coincide with the axis of the pipeline to ensure that the number of bolts is complete and the installation is tightened, and the water-stopping pad cannot block the water section.

3. When installing tees, ball valves and other wire accessories, soft plastic film materials can be used to wind and reinforce to ensure that the seal does not leak.

4. There can be no sundries and dirt at the connection between the agricultural irrigation pipeline and the agricultural irrigation valve, and the fittings with burrs can not be selected at the connection.

5. All the accessories installed with the agricultural irrigation valve should have a normal life expectancy, not too old, and the size and specifications should be strictly corresponding.

6. The plastic agricultural irrigation valve needs to be installed evenly to prevent damage caused by improper force during the installation process.

The agricultural irrigation valve undertakes the flow control of the entire water-saving irrigation system pipeline, and is a very important pipe fitting, I hope you can pay attention to these details when installing.