Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    A flange is a disc-shaped piece, also called a flange disc or rim. It is very common in piping engineering, mainly used to connect pipes to each other, and flanges are always used in pairs. The flange gasket is a very common and widely used component in engineering design. Price: 5-100 yuan per piece

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    Product Description Product Specifications Why Choose Us? FAQ

    What is a flange?

    　　Flange: it is a disc-shaped piece, also called flange disc or rim. It is very common in piping engineering, mainly to connect pipes to each other, and flanges are always used in pairs. The flange gasket is a very common and widely used piece in engineering design. It is an indispensable piece in the design of pipes, fittings, and valves, and is also an essential component in equipment and equipment parts (such as hatches, sight glasses, level indicators, etc.). Additionally, other specialties such as industrial furnaces, thermal engineering, water supply and drainage, heating, ventilation, and automatic control also frequently use flange gaskets.

    　　The flange manufacturer Zhonglian Pump Industry professionally offers products such as stainless steel flanges, forged carbon steel flange caps, forged high-pressure flanges, 304 flanges, forged flange discs, butt-welded steel pipe flanges, flat plate-type flanges, among others. The flange prices are fair and economical, with honest quotations.

     

    ↑High-pressure flange configured on horizontal multistage centrifugal pump↑

     

    Flange material

    　　Forged steel, WCB carbon steel, stainless steel, 316L, 316, 304L, 304, 321, chrome-molybdenum steel, chrome-molybdenum-vanadium steel, molybdenum-titanium, rubber coating, fluoride coating

     

    Flange classification

    　　Flat flange, neck flange, butt-weld flange, ring joint flange, plug flange, and blind flange, among others.

     

    Common flange connection forms for water pumps

    　　The flange connection for water pumps consists of fixing each of the two pipes, fittings, or equipment to a water pump flange disc, then placing a flange gasket between the two discs and tightening them with bolts to complete the connection. Some fittings and equipment already come with water pump flange discs, which is also considered a flange connection for water pumps.

    　　1. Connection forms of flange discs for water pumps

    　　This is the most commonly used connection form in valves. According to the shape of the joint surface, it can be divided into the following categories:

    　　1. Flat type: for low-pressure valves. Easy to process.

    　　2. Male-female type: for higher working pressures, medium-hard gaskets can be used.

    　　3. Tongue and groove type: gaskets with large plastic deformation can be used, widely used in corrosive media, with good sealing effect.

    　　4. Trapezoidal groove type: uses an oval metal ring as a gasket, for valves with working pressure ≥64 kg/cm² or high-temperature valves.

    　　5. Lens type: the gasket is lens-shaped and made of metal. It is used in high-pressure valves with working pressure ≥100 kg/cm² or high-temperature valves.

    　　6. O-ring type: it is a relatively new flange connection form, developed with the appearance of various rubber O-rings, and is used in sealing connections.

           2. Clamping flange connection:

    　　Connection form where the valve and pipes at both ends are directly clamped with bolts.

    　　3. Butt weld connection:

    　　Welded directly to the pipe.

    　　Installation of flange discs for water pumps

    　　1. Before installing the valve, carefully verify that the valve model and specification match the design.

    　　2. According to the valve model and factory manual, verify if the valve can be used under the required conditions.

    　　3. When lifting the valve, the rope must be tied at the flange connection between the valve body and bonnet, not on the handwheel or stem to avoid damage.

    　　4. When installing the valve on horizontal pipes, the stem must be vertical upwards; installation facing downwards is not allowed.

    　　5. When installing the valve, do not force the connection by pulling abruptly to avoid damage from uneven forces.

    　　6. Gate valves with exposed stems should not be installed in damp underground places to avoid stem corrosion.

    　　Compatible electric actuator

    　　The electric actuator is commonly used with valves in automatic control systems. There are many types of electric actuators with different operation modes, such as the angular travel electric actuator that produces torque, and the linear travel electric actuator that produces thrust. The selection of the electric actuator type for the system should be based on the valve's working needs.

    　　4. Threaded connection:

    　　It is a simple connection method, common in small valves. It is divided into two cases:

    　　1. Direct sealing: the internal and external threads act directly as a seal. To ensure no leaks, lead, hemp, and PTFE tape are usually used; PTFE tape is increasingly common, has good corrosion resistance, excellent sealing effect, is easy to use and preserve, and can be completely removed when disassembling, as it is a thin non-adhesive film, much better than lead and hemp.

    　　2. Indirect sealing: the force of tightening the thread is transmitted to the gasket between two flat surfaces, making the gasket act as a seal.

    　　5. Sleeve connection:

    　　The sleeve connection works and seals when tightening the nut, the sleeve is pressed and its edge bites the outer wall of the pipe, and the outer conical surface of the sleeve fits the inner conical surface of the connector body, effectively preventing leaks.

    　　The advantages of this connection form are:

    　　1. Small size, light weight, simple structure, easy to assemble and disassemble.

    　　2. Strong connection strength, wide range of use, resistant to high pressure (1000 kg/cm²), high temperature (650℃), and impact vibrations.

    　　3. Various materials can be selected, suitable for corrosion resistance.

    　　4. Does not require high processing precision; convenient for installation at height.

    　　Connection form with sleeve, already used in some small-diameter valve products in China.

    　　Six, clamp connection:

    　　This is a quick connection method that only requires two bolts, suitable for low-pressure valves that are frequently disassembled.

    　　Seven, internal self-adjusting connection:

    　　All the above-mentioned connection forms use external force to counteract the medium pressure and achieve sealing. Below is a connection form that uses the medium pressure to self-adjust. Its sealing ring is installed on the inner cone, with a certain angle on the face facing the medium. The medium pressure is transmitted to the inner cone and then to the sealing ring. On the conical surface with a certain angle, two component forces are generated: one parallel to the valve's central axis outward, and another pressing against the valve's inner wall. The latter force is the self-adjusting force. The higher the medium pressure, the greater the self-adjusting force. Therefore, this connection form is suitable for high-pressure valves. Compared to flange connection, it saves a lot of material and labor but also requires a certain preload force to ensure reliable use when the valve's internal pressure is not high. Valves manufactured with the self-adjusting sealing principle are generally high-pressure valves. There are many other valve connection forms, for example, some small valves that do not need disassembly are welded directly to the pipes; some non-metallic valves use plug-type connections, etc. Valve users should handle each case according to specific circumstances.

    Changsha Zhonglian Pump Industry Co., Ltd.

    Why Choose Us?

    Changsha Zhonglian Pump Industry Co., Ltd. was established in 1989, following the reform of the Changsha Water Pump Factory. It is a national high-tech comprehensive enterprise integrating design, research and development, manufacturing, and service. The company was listed on the Hunan Provincial Stock Exchange on December 31, 2019, with the abbreviated name "Zhonglian Pump Industry" and stock code: 600275HN. It is currently a key enterprise in China's centrifugal pump industry and one of the leading domestic manufacturers of multi-stage pumps, headquartered in Changsha, Hunan, a historical and cultural city in China.

    Changsha Zhonglian Pump Industry Co., Ltd.
    Changsha Zhonglian Pump Industry Co., Ltd.

    FAQ

    Q

    What products do you mainly produce?

    A

    Zoomlion Pump Industry manufactures various large industrial centrifugal pumps. The main products include: self-balancing multistage pumps, multistage centrifugal pumps, single-stage centrifugal pumps, split-case pumps, chemical pumps, submersible pumps, pipeline pumps, long-shaft pumps, condenser pumps, and more.

    Q

    Can you help me choose a model?

    A

    Of course! If the water pump model is not selected accurately, it can cause significant problems. After you take it back, it might be either too small to meet the usage requirements or too large, resulting in higher electricity and fuel costs, increasing the operating expenses.

    Q

    Why is the price quotation so slow?

    A

    Because centrifugal pumps are non-standard custom products with many models and a wide price range. Even for the same model, the price varies greatly depending on the materials and configurations used. Taking the most common pump accessory—the impeller—as an example, the price of a stainless steel impeller is several times that of a cast iron impeller. Therefore, we need to clearly confirm the relevant information to provide you with an accurate price. Normally, if you provide comprehensive information, we can quote within 5 minutes.

    Q

    What information should I provide when I need a quote?

    A

    Usually, if you want to get an accurate quote, it is recommended that you provide us with the following information: pump flow rate, head, on-site operating voltage, frequency, temperature of the conveyed liquid, pH value, solid particle content, on-site installation conditions (horizontal or vertical installation), and other related details. If you are not very familiar with these, it’s okay; our sales manager will assist you in determining them.

    Q

    Do you have centrifugal pumps in stock?

    A

    There are many models and configurations of centrifugal pumps. Except for a small number of commonly used standard models that are in stock, the vast majority of models and configurations are not stocked and are customized products. We need to first select the pump based on your site conditions such as flow rate, head, medium temperature, pH value, and installation conditions. After determining the pump model and configuration, we can then place an order with the workshop for production.

    Q

    What is your usual delivery time?

    A

    Models in stock can be shipped by the next day at the latest. Others are custom-made, and depending on the product size and specific project conditions, the delivery time is generally between 7-90 days. Please consult our sales manager for details: 0731-88632200 。

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