The butterfly valve at the water supply and return place of the air conditioner can be changed to th

Yes, the butterfly valve is easy to use, why change it.

I don't know why I changed it? Is the butterfly valve not easy to use? Or is there a problem with the butterfly valve itself?

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 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, 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 the user's stove.

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 the rankings may vary by time and region. For the latest ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

With the same material and specifications, the gate valve is much more expensive. The gate valve is also much heavier than the butterfly valve.

With the same pipe diameter, the same material, and the same pressure level, the weight of the gate valve is much heavier than that of the butterfly valve, about 2 times that of the butterfly valve!

Gate valve. In general, if you need to have better adjustability, you should choose a gate valve, and if you need to do better, you can choose a globe valve.

However, the price is also increasing for butterfly valves, gate valves, and globe valves.

According to the connection method, butterfly valves are divided into two types: a pair of clamp butterfly valves and two flange butterfly valves.

Under normal circumstances, below DN400, the flange butterfly valve is the most expensive, the gate valve is the second, and the clamp type is the cheapest. For DN400 or more, the gate valve is the most expensive, followed by the blue butterfly valve, and the clamp is the cheapest.

In general, the diameter less than or equal to DN400 is selected gate valve and pair clamp butterfly valve. However, it is subject to on-site working conditions.

Gate valves and butterfly valves cannot simply be compared there, depending on the actual design requirements of the project. Generally, small-caliber gate valves are selected, because the sealing performance is better, and the service life is long, the maximum diameter of the general gate valve is to DN800, and the pipeline above 800 usually chooses to use butterfly valves, because butterfly valves are cheaper, only half of large-diameter gate valves. There are also some pipelines that choose gate valves from the perspective of quality of use.

For more information on how to use it, please click on the map markers.

These are two different types of valves.

The opening and closing parts of the butterfly valve are disc-shaped butterfly plates, which do angular stroke movement, and the opening and closing parts of the gate valve are gate plates, which do linear stroke movements.

The installation of valves on the water inlet and return pipes of the air conditioner is the need for pressure testing of the pipeline system, and the other is the need for disassembly and assembly during equipment maintenance and cleaning.

There should be both water and return water, and the water can be turned off during maintenance to facilitate maintenance.

The opening of the valve should mean open and closed, the butterfly valve is half open or fully open, the flow rate is calculated according to your switch angle, there is nothing to worry about, rest assured to use.

What is the ratio of the overflow area? In the case of a butterfly valve, does the opening refer to the angle at which the flap is turned? The linear closing of the butterfly valve means that the valve of the butterfly valve is kept constant.

The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body, so as to achieve opening and closing or adjustment; The actuator is electric or pneumatic, etc., and the valve stem and valve plate are driven to rotate through the transmission device;

The butterfly valve is usually less than 90 degrees from full open to fully closed, and the opening refers to the angle of rotation of the butterfly plate;

Linear closing should be the positioner is linear, if the potentiometer is 0-10 thousand ohms, corresponding to 0-90 degrees, 500 ohms, the opening is 45 degrees;

The "opening-flow" curve of a butterfly valve is essentially linear at a flow rate of 25%-75%. That is to say, if the opening is 40%, the flow rate is about 40%.

The opening of the butterfly valve should be 50% open, that is, the opening is 45 degrees;

The opening of the valve refers to the percentage, in general, the butterfly valve is expressed by an angle of 0 degrees for full closure and 90 degrees for full opening. The regulating valve is expressed in terms of diameter, for example, a DN100 diameter valve means that its diameter is 100 mm, but its (spool) fully open stroke is not 100 mm. People don't understand this kind of opening relationship, so they use it as a percentage.

For example, the butterfly valve is 45 degrees when it is half open, which is not easy to understand, so we say 50%, and the same is true for the regulating valve.

1.Ball valves.

Ball valves are evolved from plug valves. It is the same as the rotation of 90 degrees, the difference is that the body is a sphere, with a circular through hole or channel and its axis. The ratio of the spherical surface to the channel mouth should be such that when the ball is rotated 90 degrees, the sphere should be presented at the inlet and outlet, thus cutting off the flow.

The ball valve only needs to be rotated 90 degrees and the torque is small to close tightly. The completely equal body cavity provides a straight-through flow path with minimal resistance to the medium. Ball valves are generally considered to be most suitable for direct opening and closing, but recent developments have designed ball valves to throttle and control flow.

The main feature of the ball valve is that it is compact in its own structure, easy to operate and maintain, and is suitable for general working media such as water, solvents, acids and natural gas, but also for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be monolithic or combined.

2.Shut-off valves.

The axis of the globe valve and stem is perpendicular to the seat sealing surface. The relatively short opening or closing stroke of the stem and the very reliable shut-off action make this valve ideal for use as a shut-off or for mediating and throttling. Once the disc of the globe valve is in the open state, once its seat and disc are in the open state, there is no longer contact between the valve seat and the sealing surface of the valve disc, and it has a very reliable shut-off action, which is very suitable for the use of cut-off or adjustment and throttling of the medium.

Once the globe valve is in the open state, there is no longer contact between its seat and the sealing surface of the valve disc, so the mechanical wear of its sealing surface is small, because the valve seat and disc of most globe valves are relatively easy to repair or replace the sealing elements without removing the entire valve from the pipeline, which is very suitable for the occasion when the valve and the pipeline are welded into one. The flow direction of the medium through these valves changes, so the flow resistance of the globe valve is higher than that of other valves.

3.Gate valve. The gate valve is used as a shut-off medium, and the entire flow is straight through when fully opened, when the pressure loss of the medium is minimal. Gate valves are usually suitable for applications where the gate does not need to be opened and closed as often as possible, and the ram is kept fully open or closed. Not intended for use as conditioning or throttling.

For high-speed flowing media, the ram can cause the vibration of the gate when it is partially opened, and the vibration may damage the sealing surface of the ram and the valve seat, and the throttling will cause the ram to suffer from the erosion of the medium. In terms of structural form, the main difference is the form of the sealing element used. Depending on the form of the sealing element, gate valves are often divided into several different types.

In addition, the manual valve is the most basic type of actuation valve. It is available in two ways: direct drive with a handwheel, handle or wrench, and drive through a transmission mechanism. When the starting torque of the valve is large, it can be driven by gear or turbine transmission to achieve the purpose of omission.

Gear transmission is divided into spur cylindrical gear transmission and bevel gear transmission. The gear rotation reduction ratio is small, which is suitable for gate valves and globe valves, and the turbine transmission reduction ratio is large, which is suitable for and ball valves.

First, the opening and closing parts are different.

1. Gate valve: The opening and closing parts are rams, and the direction of movement of the ram is perpendicular to the direction of fluid.

2. Butterfly valve: The opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body.

3. a globe valve.

The opening and closing parts are plug-shaped discs, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid.

Second, the characteristics are different.

1. Gate valve: light weight, flat-bottomed gate seat, integral rubberization, precision casting valve body.

2. Butterfly valve: simple structure, small size, light weight, low material consumption, small installation size, fast switch, 90° reciprocating rotation, small driving torque, etc., used for cutting, connecting and adjusting the medium in the pipeline, with good fluid control characteristics and closing sealing performance.

3. Globe valve: The opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable shut-off function, and the change of the valve seat port is proportional to the stroke of the valve disc.

It is very suitable for regulating the flow rate.

Third, the working principle is different.

1. Gate valve: The gate plate of the gate valve moves in a straight line with the valve stem, which is called the lifting rod gate valve, also known as the open rod gate valve. There are usually trapezoidal threads on the lifting rod.

Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust.

2. Butterfly valve: a valve that opens, closes or adjusts the flow of the medium by turning the disc opening and closing parts back and forth about 90°. 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.

3. Globe valve: The closing principle of the check valve is to rely on the pressure of the valve bar to make the sealing surface of the valve disc and the sealing surface of the valve seat fit tightly to prevent the flow of medium. China's valve "three to give" has stipulated that the flow direction of the globe valve is all top-down, so there is directionality when installing.

Encyclopedia - Globe valve.

Encyclopedia - Butterfly Valve.

Gate valves, butterfly valves, and globe valves are different types of valves, and there are some differences in their structure, working principle, and application, as follows:

Knife gate valves. 1.Structure:

A gate valve usually consists of a valve body with a flat or inclined gate that changes the diameter of the valve port by raising and lowering the stem. A butterfly valve consists of a disc-shaped body that changes the bore of the valve port by rotating the stem or handle. A globe valve generally consists of a body and a bonnet with a spool, which is raised and lowered by the stem to change the orifice diameter.

2.Working principle: The gate valve realizes the truncation or shut-off of the fluid through the lifting of the ram.

Butterfly valves open or close the fluid by rotating the valve disc. The globe valve can cut off or cut off the fluid by lifting and lowering the spool, and the flow can be adjusted by the rotation of the spool.

3.Applications: Gate valves are generally used to cut off fluids, such as when the flow of fluids needs to be completely blocked.

Butterfly valves are generally suitable for opening or closing control of large flow of fluids, such as fluid control in large bore pipes. Shut-off valves are generally used to cut off or cut off the fluid, and the flow rate needs to be regulated, such as when the flow of the fluid needs to be controlled.

4.Fluid resistance: Gate valves generally have a large fluid resistance because the fluid flows through the ram plate and there is a large friction.

Butterfly valves have less fluid resistance in the fully open state, but can produce greater fluid resistance in the partially open or closed state. The shut-off valve has less fluid resistance because the spool can be fully opened or closed.

5.Operation mode: Gate valve is generally manually operated or spiral driven, pneumatic, electric and other methods can also be selected. Butterfly valves are generally operated manually, geared, pneumatic, electric, etc. Globe valves are generally operated manually, geared, electric, etc.

The right valve type needs to be selected based on specific process requirements, fluid properties, flow control requirements, and other factors to ensure that it can meet the expected control needs in practical applications.

According to the function and use of gate valve and butterfly valve, the flow resistance of the gate valve is small, the sealing performance is good, because the flow direction of the gate valve plate and the medium is a vertical angle, if the gate valve is not in place in the valve plate switch, the medium scouring the valve plate makes the valve plate vibrate, and it is easy to damage the gate valve seal.

Butterfly valve, also known as flap valve, is a simple structure of the regulating valve, which can be used for the on-off control of low-pressure pipeline medium butterfly valve refers to the shut-off part (disc or butterfly plate) as a disc, rotating around the valve shaft to achieve opening and closing of a kind of valve, the valve can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. It mainly plays the role of cutting and throttling on the pipeline. The butterfly valve opening and closing part 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.

The butterfly plate is driven by the valve stem, and if it is turned 90°, it can complete a opening and closing. By changing the deflection angle of the butterfly, the flow rate of the medium can be controlled.

Working conditions and medium: Butterfly valve is suitable for conveying various corrosive and non-corrosive fluid media in engineering systems such as furnaces, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting and power generation environmental protection, building water supply and drainage, etc., and is used to regulate and cut off the flow of media.

Gate valve (gate valve) is an opening and closing part of the gate, the direction of movement of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully opened and closed, the discomfort of the door parameters are different, usually 5°, when the medium temperature is not high, it is 2°52'. To improve its manufacturability and make up for the deviation of the sealing surface angle in the processing process, this kind of ram is called elastic ram.

When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, only rely on the medium pressure to press the sealing surface of the ram to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the ram must be forcibly pressed to the valve seat by external force to ensure the tightness of the sealing surface.

Movement mode: The gate plate of the gate valve moves in a straight line with the valve stem, which is also called the open rod gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into operating thrust.

When the valve is opened, when the ram lift height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but this position cannot be monitored during operation. In actual use, it is marked by the apex of the valve stem, that is, the position that cannot be opened, as its fully open position.

In order to account for the lock-up phenomenon of temperature changes, it is usually opened to the apex position, and then reverted back to 1 2 1 turns, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the ram (i.e., the stroke). Some gate valve stem nuts are located on the gate plate, and the handwheel rotates to drive the valve stem to rotate, and the gate plate is lifted, and this valve is called the rotary rod gate valve or the dark rod gate valve.