STV Delivery Wafer Knife Gate Valve,304,150LB,To Canada,60PCS
KNIFE GATE VALVE CLASS 150# , CF8 BODY ,
304 / PTFE TRIM , WAFER TYPE
SIZE 4″ ” STV ” KG151 60PCS
wafer knife gate valve dimensions
KNIFE GATE VALVE CLASS 150# , CF8 BODY ,
304 / PTFE TRIM , WAFER TYPE
SIZE 4″ ” STV ” KG151 60PCS
wafer knife gate valve dimensions
The opening and closing part of manual butterfly valve is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening and closing or regulating.
The butterfly plate of the manual butterfly valve is installed in the diameter direction of the pipeline. In the cylindrical passage of the butterfly valve body, the disc butterfly plate rotates around the axis, the rotation angle is between 0 and 90 and when the rotation angle is between 0 and 90 the valve is fully open. The butterfly valve is simple in structure, small in volume and light in weight, and consists of only a few parts. The valve can be switched on and off quickly only by rotating 90 degrees. The operation is simple and the valve has good fluid control characteristics.
We all know that there are many kinds of ball valves, including this butterfly valve is one of them. Then the well-known difference between ball valve and butterfly valve is its opening and closing parts, the opening and closing parts of butterfly valve are plates, and the ball valve is a ball. They all rotate around one of their axes. Let’s go on and see what’s the difference between butterfly and ball valves.
Distinction One
Ball valves and butterfly valves have different cut-off modes: ball valves block the passage through the ball to achieve pipeline cut-off flow; butterfly valves rely on butterfly wings, laying the sealed pipeline will not flow.
Difference 2
The structure of ball valve and butterfly valve is different: ball valve is made of valve body, spool and stem assembly, only part of the parts can be seen in the body; butterfly valve is made up of valve body, seat, valve plate and stem, all parts are exposed outside. So it can be seen that the sealing of butterfly valve is not as good as that of ball valve. Speaking of sealing, butterfly valves are also divided into soft and hard seals. Butterfly valve structure is relatively simple, can only be used in low pressure environment, the maximum pressure is only 64 kg. Compared with ball valves, ball valves can be up to about 100 kilograms.
Distinction 3
The working principle of ball valve and butterfly valve is different: the ball valve has 90 degrees rotation action, because its opening and closing parts are spheres, only need to operate 90 degrees rotation to open or close, which is the most suitable switch. But now V-type ball valves can be used to regulate or control flow. The butterfly valve is a kind of valve which uses disc-type hoist to turn back and forth about 90 degrees to open, close or regulate medium flow. It has good function of regulating flow and is one of the fastest-growing valve varieties.
Comparison of Butterfly Valve and Ball Valve
Advantages of butterfly valve 1: simple structure, small size, light weight; Disadvantage is that the use of pressure and working temperature is much smaller than the spherical valve range.
Advantages of butterfly valves 2: Good sealing can be achieved under low pressure; Disadvantage is that the sealing performance is much worse than that of ball valves.
Advantages of butterfly valve 3: It can transport mud, and has the least liquid in the pipe mouth, which is better than ball valve.
Advantages of butterfly valves 4: The structure principle of butterfly valves is more suitable for large caliber valves, which are widely used in petroleum, gas, chemical and other industries.
One. Opening and closing parts are different
The knife gate valve is a gate that opens and closes vertically along the body passage. The gate has the function of cutting off, and can be used in sewage or impurity pipelines.
The butterfly valve is a rotary valve. The butterfly valve rotates in the channel to open and close. It has flow loss and can only be used for pure medium.
Similarity: The valve body is thin and is used in low pressure pipelines.
VALVE:CHECK;STEEL,
300DIAX180MM L,
WAFER TYPE
QNSI SER#150 DBL
DISC 316+EPDM SEAT
APPLICATION:
POTABLE WATER
MFR: STV
CORPORATION OR
EQUIVALENT” NOTE:
SEAT MATERIAL: TO
BE
ADVISEDHS:848180409
0
The WAFER check valve refers to a valve that automatically opens and closes the valve flap by means of the flow of the medium itself, and is used to prevent the back flow of the medium, which is also called a check valve, a check valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve whose main function is to prevent backflow of the medium, prevent the pump and drive motor from reversing, and discharge the container medium. The check valve can also be used to supply a line in which the pressure may rise to an auxiliary system that exceeds the system pressure. The check valve can be mainly divided into a swing type check valve (rotation according to the center of gravity) and a lift check valve (moving along the axis)
working principle
The function of this type of valve is to allow only the medium to flow in one direction and to prevent the flow in the opposite direction. Usually, the valve is automatically operated, and the valve flap is opened by the fluid pressure flowing in one direction; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing valve flap of the valve disc act on the valve seat to cut off the flow.
Among them, the stainless steel wafer type check valve belongs to this type of valve, and includes a swing type check valve and a lift check valve. The swing check valve has a hinge mechanism and a door-like flap that rests freely against the inclined seat surface. In order to ensure that the valve flap can reach the proper position of the valve seat surface each time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swinging space and the valve flap is truly and comprehensively in contact with the valve seat. The flaps can all be made of metal, or they can be inlaid with leather, rubber, or synthetic coverings depending on the performance requirements. With the swing-open check valve fully open, the fluid pressure is almost unimpeded, so the pressure drop across the valve is relatively small. The valve flap of the lift check valve is located on the valve seat sealing surface of the valve body. In addition to the flap being free to lift and lower, the valve is like a shut-off valve. The fluid pressure causes the flap to lift from the seat sealing surface. The backflow of the medium causes the flap to fall back onto the seat and shut off the flow. Depending on the conditions of use, the flap can be of all metal construction or it can be in the form of a rubber or rubber ring on the valve disc holder. Like the shut-off valve, the passage of fluid through the lift check valve is also narrow, so the pressure drop through the lift check valve is larger than that of the swing check valve, and the flow rate of the swing check valve is limited. Very few].
Technical Parameters
Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-900, JIS10-20K
Nominal diameter or caliber: DN15~900, NPS 1/4~36
Connection method: flange, butt welding, thread, socket welding, etc.
Applicable temperature: -196 ° C ~ 540 ° C
Body material: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), Ti.
Different materials can be used for water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media.
China’s pump and valve market is less concentrated in the industry, mainly in the production of low-end products. In terms of owning core technologies, there is still a certain gap between domestic enterprises and developed countries in the world.
At present, there are still some problems in China’s valve industry. For example, Chinese valve companies mainly focus on low-level, small-scale, family-run enterprises. In terms of products, due to repeated investment and insufficient technology introduction, the leading products of Chinese valve enterprises are still low-quality mass products. It is understood that the current various valves produced by Chinese enterprises generally have shortcomings such as leakage, internal leakage, low appearance quality, short life, inflexible operation, and unreliable valve electric devices and pneumatic devices. Some products are only equivalent to the last century. At the international level in the early 1980s, some valves required for high temperature and high pressure and critical equipment still depended on imports.
China’s valve industry in the industrial structure, the industrial chain of industrial valves, and the degree of specialization of the industry have a large gap with foreign companies, resulting in low quality of domestic valve products: due to the rapid expansion of the market, the original state-owned valve companies have Shut down and turn. According to the survey of air-conditioning and refrigeration market, although a number of township and village enterprises have developed rapidly, due to the low starting point of township and village enterprises, the technical strength is very weak, and the equipment is simple. Most of the products are imitated, especially the low-pressure valves for water supply and drainage. The above problems do not affect the broad prospects of the Chinese valve industry in the future. This is mainly due to the support of national policies and the strong demand for the valve product market. In particular, the construction of several projects such as “West-East Gas Transmission”, “West-to-East Power Transmission” and “South-to-North Water Transfer” requires a large number of valve products. .
Last year, the total import and export volume of China’s valve industry reached US$24.1 billion, a year-on-year increase of 28.2{8141c64f649aa10a30e48bdb99fa3eccf7af065b4b625c7c4d110ee570dfa2a6}. The total export value was US$22.4 billion, a year-on-year increase of 29.3{8141c64f649aa10a30e48bdb99fa3eccf7af065b4b625c7c4d110ee570dfa2a6}; the total import value was US$201.34 billion, a year-on-year increase of 27{8141c64f649aa10a30e48bdb99fa3eccf7af065b4b625c7c4d110ee570dfa2a6}. With the recovery of the world economy, the import and export of Chinese valve products has also increased. However, due to the large gap in high-end technology compared with foreign manufacturers, in the future, product technology will become a constraint on the development of China’s valve products. bottleneck.
Until recently, Chinese valve manufacturers were limited to a few profitable target markets, such as Ethiopia, Sudan, Iran, Iraq and parts of Southeast Asia. These markets are small in scale, and the decision-making process is entirely dependent on price and limited profit margins. Chinese imported valve manufacturers must pay attention to the undeniable fact that if they want to survive in the future, they must improve their previous sluggish performance and obtain large export manufacturing profits. The main reason for the current lack of export revenue is that there are a lot of business opportunities in China’s domestic market, and the quality of equipment imported from China’s valve manufacturing is not enough to sell overseas.
The butterfly valve is a simple regulating valve, which is mainly composed of a valve body, a valve stem, a butterfly plate and a sealing ring. The valve body has a cylindrical shape with a short axial length and a built-in disc. The butterfly valve has the advantages of flexible operation and labor saving, and can be selected by manual, electric, pneumatic, hydraulic, and convenient installation, and is well received by everyone. I believe that many people don’t know much about the specifications and models of butterfly valves. Let’s take a look at the specifications and models of butterfly valves.
Butterfly valve advantages
3, can transport mud
4, under low pressure, can achieve a good seal.
5, the adjustment performance is good.
Butterfly valve specifications and models
Model: D71X/F
Caliber: 40~800
Pressure: 1.6MPa
Material: cast iron, cast steel, stainless steel
Flanged butterfly valve
Model: D41X/D43H
Caliber: 50 ~ 1200
Pressure: 1.6MPa-4.0MPa
Material: cast iron, cast steel, stainless steel
Pneumatic hard seal butterfly valve
Model: D673H/D643H
Caliber: 50~2000
Pressure: 1.6MPa-4.0MPa
Material: cast iron, cast steel, stainless steel
Material: ductile iron, cast steel, alloy steel, stainless steel
The butterfly valve model indicates that the sequence code is generally: butterfly valve type code, butterfly valve transmission mode, butterfly valve connection form, butterfly valve structure form, butterfly valve sealing surface material or lining material, butterfly valve nominal pressure, butterfly valve body material, which is the most basic arrangement mode D341X. -16C.
The above is a brief introduction to the specification and model of the butterfly valve. It can be known from the above that the butterfly valve has a wide application range. The butterfly valve is widely used not only in general industries such as petroleum, gas, chemical, water treatment, but also for cooling of thermal power stations. water system. When installing the butterfly valve, you should pay attention to the valve flap to stop at the closed position. The opening position should be determined according to the rotation angle of the butterfly plate. The butterfly valve with the bypass valve should open the bypass valve before opening. I hope that the introduction of these butterfly valve specifications and models can help everyone.
Swing check valve is suitable for nominal pressure PN1.0MPa~42.0MPa, CLASS150Lb~2500Lb; nominal diameter DN15mm~1200mm, NPS1/2″~48″; working temperature -196C~540C for various pipelines, used for Prevent the media from flowing backwards. By using different materials, it can be applied to a variety of media such as water, steam, oil, nitric acid, strong oxidizing medium and urea.
The structure length is short, and its structure length is only 1/4~1/8 of the traditional flange check valve;
Small in size and light in weight, its weight is only 1/4~1/20 of the traditional flange check valve;
The valve flap is closed quickly and the water hammer pressure is small;
Both horizontal and vertical pipes can be used for easy installation;
Flow to smooth, fluid resistance is small;
Sensitive action and good sealing performance;
The valve flap has a short stroke and a small impact force;
The overall structure is simple and compact, and the shape is beautiful;
Long service life and high reliability
Stainless steel valves refer to valves made of stainless steel. Stainless steel valves are used in the industry: food biscuit industry, instant noodles and rice noodle industry, various quick-frozen food dewatering line equipment, and glass products industry. So how do stainless steel valves work?
Opening and closing of the valve: The stainless steel valve is the most widely used valve. Its hand wheel or handle is designed according to ordinary manpower, considering the strength of the sealing surface and the necessary closing force. Therefore, you cannot use long levers or long wrenches to move. Some people are accustomed to using the wrench, should pay careful attention, do not use too much force, otherwise it is easy to damage the sealing surface, or the plate breaks the hand wheel, handle. When opening and closing the valve, the force should be stable and not impact. Some components of high-pressure valves that have been opened and closed by impact have been considered such that the impact force cannot be equal to that of a general valve. For steam valves, pre-heating should be carried out before opening, and condensed water should be removed. When opening, it should be as gentle as possible to avoid water hammer. When the valve is fully open, the handwheel should be reversed a little to make the threads tightly tight to avoid loose damage.
For open-end valves, keep in mind the position of the stem when fully open and fully closed to avoid hitting the top dead center when fully open. And it is easy to check whether it is normal when fully closed. If the valve is detached or a large debris is embedded between the valve plug seals, the position of the valve stem will change when fully closed.
Some media, after the valve is closed, cool, the valve member shrinks, the operator should close again at the appropriate time, so that the sealing surface does not leave a slit, otherwise, the medium flows through the slit at a high speed, it is easy to erode the sealing surface. .
When the stainless steel valve is operated, if it is found that the operation is too laborious, the reason should be analyzed. If the packing is too tight, it can be loosened properly. If the valve stem is skewed, the person should be notified to repair it. In some cases, when the valve is closed, the closing member is heated and expanded, which makes opening difficult. If it must be opened at this time, the bonnet thread can be loosened by half a turn to one turn, the stem stress is eliminated, and then the hand wheel is driven.