Comparison of the performance of ordinary handle butterfly valve and gate valve of handle type butte

Which ordinary butterfly valve or gate valve with the same nominal pressure and nominal diameter has better tightness and is not easy to leak?

The tightness of the gate valve is better than that of the butterfly valve, but there are also manufacturers with good sealing performance of the butterfly valve.

Gate valves are large in size and take up a lot of space.

The butterfly valve is small in size and occupies little space.

When selecting specifically, it is also necessary to consider the temperature of the medium, the sealing and packing of the valve.

The specification stipulates the use of disc valves with nominal diameters greater than 50.

The handle type butterfly valve is a national key new product, and the high-performance manual butterfly valve adopts a double eccentric and a special oblique cone oval seal structure. It solves the drawback that the traditional eccentric butterfly valve is still in sliding contact friction at the instant sealing surface of 0° 10° when opening and closing, and realizes the effect of separating the sealing surface of the butterfly plate at the moment of opening and sealing when the contact is closed, so as to achieve the purpose of prolonging the service life and the best sealing performance.

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 are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, 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 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 evolving 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.

Butterfly valve, also known as flap valve, is a simple structure of the regulating valve, but also can be used for low-pressure pipeline medium on/off control. Butterfly valve refers to a kind of valve in which the shut-off part (disc or butterfly plate) is a disc and rotates around the valve shaft to achieve opening and closing, which mainly plays the role of cutting off 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.

Butterfly valves are suitable for transporting 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 and environmental protection, and are used to regulate and cut off the flow of media.

1. The butterfly valve has the characteristics of simple structure, small size, light weight, low material consumption, small installation size, fast switch, 90° reciprocating rotation, small driving torque, etc., and is used to cut, turn on and adjust the medium in the pipeline, and has good fluid control characteristics and closing sealing performance.

2. The butterfly valve can transport mud and accumulate the least liquid at the mouth of the pipeline.

At low pressures, a good seal can be achieved.

Good regulation performance.

3. The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be described as an energy-saving product.

4. The valve stem is a through-rod structure, which has good comprehensive mechanical properties, corrosion resistance and scratch resistance after quenching and tempering treatment. When the butterfly valve is opened and closed, the valve stem only rotates and does not lift and fall, and the packing of the valve stem is not easy to be damaged, and the sealing is reliable. It is fixed with the butterfly plate taper pin, and the overhanging end is designed to prevent the valve stem from falling out when the connection between the valve stem and the butterfly plate is accidentally broken.

5. The connection methods include flange connection, clamp connection, butt welding connection and lug clamp connection.

The driving forms are manual, worm gear drive, electric,

Pneumatic, hydraulic, electro-hydraulic linkage and other actuators can realize long-distance control and automatic operation.

The main products of Suzhou Dahao Heshan Mechanical and Electrical Equipment are: seamless steel pipes for medium and low pressure boilers, seamless steel pipes for oil casing, seamless steel pipes for ships, seamless steel pipes for conveying fluids, seamless steel pipes for oil cracking, seamless steel pipes for fertilizer equipment, seamless steel pipes for structures, and seamless steel pipes for hollow rods. Available by GB, ASTM, API

5l、api

5ct, din, jis and other standards for the production of seamless steel pipes.

The difference between a butterfly valve and a gate valve

Differences in definition:

The butterfly valve is also called the flap valve, its opening and closing part is a disc-shaped butterfly plate, which rotates around the valve shaft to realize the opening and closing of the valve, and the butterfly valve can be used as a cut-off valve on the pipeline, and can also be used to regulate the flow rate. The rotation angle of the butterfly plate is between 0-90°, when the rotation angle is 90°, the butterfly valve is in a fully open state, at this time, only the thickness of the butterfly plate is the only resistance of the fluid, and the fluid resistance is small.

Gate valve is also called gate valve, is also the most common opening and closing valve, its opening and closing parts are called gate, the gate plate with the valve stem to do the lifting movement to achieve the opening and closing of the valve, the gate valve movement direction and the direction of the flow medium in the valve body is perpendicular. The gate valve can only be fully opened or closed, and can only be used to cut off the flow of medium on the pipeline. When the gate valve is fully open, the fluid resistance in the valve body is less than that of the butterfly valve.

Differences in applicable working conditions:

The butterfly valve can be cut off and has the function of adjusting the flow rate. The scope of application is wider than that of gate valves. The butterfly valve opens and closes quickly, and can also be opened and closed frequently, so the butterfly valve is the first choice in the working environment where the opening and closing speed is required or the opening and closing is more frequent.

Under the same caliber conditions, the butterfly valve should be smaller in shape and lighter in weight, and in the working conditions with limited installation space, it will be more space-saving to choose the clamp butterfly valve. Butterfly valves of the same caliber are also cheaper than gate valves.

In addition, butterfly valves are more suitable for large-diameter ones, and butterfly valves are also suitable for conveying medium pipelines containing impurities such as small particles. However, butterfly valves also have disadvantages, the pressure and operating temperature range of its use are not as good as those of gate valves, and the tightness is not as good as that of gate valves. A butterfly valve** of the same caliber is much lower than a gate valve.

Because of its own structure, the flow resistance of the gate valve is smaller than that of the butterfly valve, and the sealing performance is better than that of the butterfly valve. The opening and closing speed of the gate valve is laborious, the opening and closing speed is slow, and it is not suitable for use in the occasion of frequent operation or emergency shut-off, and the gate valve can only be fully opened and closed, and cannot be used to adjust the flow. Therefore, gate valves are mostly used for cut-off use of pipelines that have strict requirements for sealing performance and do not need to be opened and closed frequently.

It is not suitable for adjusting the parameters of pipeline media.

The gate valve has strong adaptability and can be used in high temperature, low temperature, high pressure, low pressure and other working conditions. In steam pipelines and large-diameter feed pipes, gate valves are suitable due to the need for high sealing performance and low fluid resistance.

At present, butterfly valves and gate valves are widely used, but in many working conditions, butterfly valves have begun to gradually replace other types of valves and become the first choice for many users.

The butterfly plate of the handle butterfly valve is installed in the diameter direction of the pipe. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates around the axis, and the rotation angle is between 0°-90°, and when the rotation reaches 90°, the valve is fully open. This valve is generally installed horizontally.

The handle butterfly valve has a simple structure, small size, light weight, and is composed of only a few parts. Moreover, it can be opened and closed quickly by only 90° rotation, which is easy to operate, and the valve has good fluid control characteristics. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is very small, so it has good flow control characteristics.

Butterfly valves are available in two types of seals: elastic seal and metal seal. Elastomeric seal valves, the sealing ring can be embedded in the valve body or attached to the perimeter of the butterfly plate.

Valves with metal seals generally last longer than valves with elastomeric seals, but it is difficult to achieve a complete seal. Metal seals can accommodate higher operating temperatures, while elastomeric seals have the disadvantage of being limited by temperature.

If a butterfly valve is required to be used as a flow control, the main thing is to choose the correct size and type of valve. The structural principle of butterfly valves is particularly suitable for making large-diameter valves. Butterfly valves are not only widely used in general industries such as petroleum, gas, chemical industry, water treatment, etc., but also used in the cooling water system of thermal power stations.

There are two commonly used butterfly valves: clamp-type butterfly valve and flanged butterfly valve. The clamp butterfly valve is to connect the valve between the two pipeline flanges with stud bolts, and the flanged butterfly valve is a valve with a flange plate, and the flanges at both ends of the valve are connected to the flanges of the pipeline with bolts.

The unique design of three-way eccentricity enables frictionless transmission between sealing surfaces, prolonging the service life of the valve. Bright and good.

An elastic seal is created by torque. Wide burial.

The clever wedge-shaped design allows the valve to have an automatic sealing function that closes tighter and tighter, and the lead seal surface is compensated and has zero leakage.

Small size, light weight, light operation, easy to install.

Pneumatic and electric devices can be configured according to user requirements to meet the needs of remote control and program control.

The material of the replacement parts can be applied to various media, and the lining can be protected against corrosion (lining F46, GXPP, PO, etc.).

Continuous structure diversification: butt clamp, flange, butt welding.

Material Varieties Neoprene Nitrile Rubber Ethylene Propylene Rubber PTFE Silicone Rubber Viton Natural Rubber Nylon English Abbreviation: CR NBR EPDM PTFE SI VITON NR PA Model Code X or J XA or JA XB or JA F or XC, JC XD or JD XE or JE X1 N Maximum temperature resistance 82 93 150 232 250 204 85 93 Minimum temperature resistance -40 -40 -40 -268 -70 -23 -20 -73 Applicable operating temperature 0 +80 -20 +82 -40 +125 -30 +150 -70 +150 -23 +150 -20 +85 -30 +93

Connection Dimensions Nominal diameter (DN) l d1 d z- d h h0 a b 50 43 125 165 4-18 63 315 180 65 65 46 145 185 4-18 70 330 180 65 80 46 160 200 8-18 83 390 245 72 100 52 180 220 8-18 105 431 245 72 125 56 210 250 8-18 115 455 245 72 150 56 240 285 8-22 137 626 355 93 200 60 295 340 8-22 164 720 350 93 250 68 350 395 12-22 206 800 550 350 300 78 400 445 12-22 230 860 600 350 350 78 460 505 16-22 248 883 600 350 400 102 515 565 16-26 289 972 600 350 450 114 565 615 20-26 320 1043 750 380 500 127 620 670 20-26 343 1098 750 380 600 154 725 780 20-30 413 1236 750 380 700 165 840 895 24-30 478 1431 750 380 800 190 950 1015 24-33 525 1488 750 380