China Hot selling Worm Drive High Performance Butterfly Valve Wafer Lug Cast Iron Butterfly Valve with Hot selling

Product Description

Ductile Iron Wafer and Lug High Performance Butterfly Valves

        This series of butterfly valve use concentric structure design, and their main structure                    consists of body, disc, seat, stem and transmission mechanism parts, which can also                      according to the physical and chemical properties of different medium, to choose the                      corresponding material which is corrosion resistance, light resistance, aging resistance, 
        and can be widely applied in the drainage, petroleum, chemical, food, medicine, energy                  systems and other fluid on the pipeline as the adjusting and intercepting device. 


    Product Description

    Performance Specification  

       Nominal Diameter (DN) 25(1″)~600(24″) 25(1″)~600(24″) DN (inch)
    Nominal Pressure (PN) 10 16 BAR
     Test Pressure Body 15 24
     Sealing 11 17.6
    Working temperatureºC -15ºC~+150ºC
    Applicable Mediums Fresh water, sewage, sea water, air, steam, food, drug, various oil, acid, alkali, salt, etc.

    Note: Applicable temperature and mediums are depending on the materials of different valve seats, bodies, stems and discs, see table 1 and table 2:   

    Regular Material of the Main Parts (Table 1)

    Body Disc Stem
    Name Code Name Code Name Code
    Cast Iron GG25  Electric-plated
    GGG40+Ni Stainless Steel 416/316
     Ductile   Iron(DI) GGG40 AL-Bronze C954/C958     431/17-4
    AL-Bronze C954/C958 Stainless Steel CF8/CF8M    
    Stainless Steel CF8/CF8M Coating DI  GGG40+Nylon    
    Carbon Steel WCB        

    Properties of Valve Seat (Table 2)

    Seat Applicable TemperatureºC  Applicable Medium
    HYPALON -15ºC~+120ºC Water, some kind of oil and moderate chemicals, ozone, fat, animal fat, several of solvents, high and low pressure steam are forbidden.
    EPR -15ºC~+121ºC Ozone, strong and chemical oxidation, several of solvents, alcohol, acid and alkali, low pressure steam, air, water, heavy water, sewage, hot and cold water.
    CR -15ºC~+99ºC Air, water, heavy water, oil, moderate chemicals, acids, ozone, fat, animal fat, several of solvents.
    NBR -15ºC~+82ºC Water, sea water, air, gases, chemicals, alcohol, the non aromatic agent, kerosene, animal and plant oil, light grinding medium, shall not apply to phosphate series oil and extreme pressure additive oil.
    DRC -10ºC~+50ºC Mainly suitable for semiliquid and solid powder medium, such as mud, coal slurry, cement powder, coal powder and other powder materials.
    VITON -15ºC~+135ºC Water, sea water, sewage, alcohol, paraffin wax, oxygen, air, etc. High Chemical resistance, especially suitable for aliphatic fragrances in high temperature environment, and animal & plant oil with halogenated hydrocarbon acid. High and low pressure steam is forbidden.
    EPDM X9 -15ºC~+150ºC Mainly applicable to the low pressure steam with high temperature, hot & cold water and heat pipes for disposable water treatment.
    PTFE   -18ºC~+200ºC Mainly applicable to strong acid, strong alkali and other corrosive medium.


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    The butterfly valves are widely used in piping of chemical, food, medicine, paper making, water and electricity, shipbuilding, water supply and drainage, metallurgy and energy systems, and is available for regulating and closure devices in a variety of corrosive, non – corrosive gas, liquid, semi-liquid and solid powder pipelines and containers.   


    Q: What is your payment term?
    A: T/T 30% down payment, balance to be paid before shipment. Or L/C.

    Q: How long is your delivery time?
    A: Depends on QTY.

    Q: Are you a manufacturer or trading company? How to reach your company from ZheJiang ?
    A: We are a well-experienced manufacturer. And it is about 1.5 hours by high speed train from
    ZheJiang Nan Station.

    Q: Do you provide samples? Is it free or charged?
    A: Yes, we can offer sample free but shipping charges covered by customer.

    Q: If products have some quality problem, how would you deal with?
    A: We will responsible for all the quality problems if it is not human causes.



    Applications of Spline Couplings

    A spline coupling is a highly effective means of connecting 2 or more components. These types of couplings are very efficient, as they combine linear motion with rotation, and their efficiency makes them a desirable choice in numerous applications. Read on to learn more about the main characteristics and applications of spline couplings. You will also be able to determine the predicted operation and wear. You can easily design your own couplings by following the steps outlined below.

    Optimal design

    The spline coupling plays an important role in transmitting torque. It consists of a hub and a shaft with splines that are in surface contact without relative motion. Because they are connected, their angular velocity is the same. The splines can be designed with any profile that minimizes friction. Because they are in contact with each other, the load is not evenly distributed, concentrating on a small area, which can deform the hub surface.
    Optimal spline coupling design takes into account several factors, including weight, material characteristics, and performance requirements. In the aeronautics industry, weight is an important design factor. S.A.E. and ANSI tables do not account for weight when calculating the performance requirements of spline couplings. Another critical factor is space. Spline couplings may need to fit in tight spaces, or they may be subject to other configuration constraints.
    Optimal design of spline couplers may be characterized by an odd number of teeth. However, this is not always the case. If the external spline’s outer diameter exceeds a certain threshold, the optimal spline coupling model may not be an optimal choice for this application. To optimize a spline coupling for a specific application, the user may need to consider the sizing method that is most appropriate for their application.
    Once a design is generated, the next step is to test the resulting spline coupling. The system must check for any design constraints and validate that it can be produced using modern manufacturing techniques. The resulting spline coupling model is then exported to an optimisation tool for further analysis. The method enables a designer to easily manipulate the design of a spline coupling and reduce its weight.
    The spline coupling model 20 includes the major structural features of a spline coupling. A product model software program 10 stores default values for each of the spline coupling’s specifications. The resulting spline model is then calculated in accordance with the algorithm used in the present invention. The software allows the designer to enter the spline coupling’s radii, thickness, and orientation.


    An important aspect of aero-engine splines is the load distribution among the teeth. The researchers have performed experimental tests and have analyzed the effect of lubrication conditions on the coupling behavior. Then, they devised a theoretical model using a Ruiz parameter to simulate the actual working conditions of spline couplings. This model explains the wear damage caused by the spline couplings by considering the influence of friction, misalignment, and other conditions that are relevant to the splines’ performance.
    In order to design a spline coupling, the user first inputs the design criteria for sizing load carrying sections, including the external spline 40 of the spline coupling model 30. Then, the user specifies torque margin performance requirement specifications, such as the yield limit, plastic buckling, and creep buckling. The software program then automatically calculates the size and configuration of the load carrying sections and the shaft. These specifications are then entered into the model software program 10 as specification values.
    Various spline coupling configuration specifications are input on the GUI screen 80. The software program 10 then generates a spline coupling model by storing default values for the various specifications. The user then can manipulate the spline coupling model by modifying its various specifications. The final result will be a computer-aided design that enables designers to optimize spline couplings based on their performance and design specifications.
    The spline coupling model software program continually evaluates the validity of spline coupling models for a particular application. For example, if a user enters a data value signal corresponding to a parameter signal, the software compares the value of the signal entered to the corresponding value in the knowledge base. If the values are outside the specifications, a warning message is displayed. Once this comparison is completed, the spline coupling model software program outputs a report with the results.
    Various spline coupling design factors include weight, material properties, and performance requirements. Weight is 1 of the most important design factors, particularly in the aeronautics field. ANSI and S.A.E. tables do not consider these factors when calculating the load characteristics of spline couplings. Other design requirements may also restrict the configuration of a spline coupling.


    Spline couplings are a type of mechanical joint that connects 2 rotating shafts. Its 2 parts engage teeth that transfer load. Although splines are commonly over-dimensioned, they are still prone to fatigue and static behavior. These properties also make them prone to wear and tear. Therefore, proper design and selection are vital to minimize wear and tear on splines. There are many applications of spline couplings.
    A key design is based on the size of the shaft being joined. This allows for the proper spacing of the keys. A novel method of hobbing allows for the formation of tapered bases without interference, and the root of the keys is concentric with the axis. These features enable for high production rates. Various applications of spline couplings can be found in various industries. To learn more, read on.
    FE based methodology can predict the wear rate of spline couplings by including the evolution of the coefficient of friction. This method can predict fretting wear from simple round-on-flat geometry, and has been calibrated with experimental data. The predicted wear rate is reasonable compared to the experimental data. Friction evolution in spline couplings depends on the spline geometry. It is also crucial to consider the lubrication condition of the splines.
    Using a spline coupling reduces backlash and ensures proper alignment of mated components. The shaft’s splined tooth form transfers rotation from the splined shaft to the internal splined member, which may be a gear or other rotary device. A spline coupling’s root strength and torque requirements determine the type of spline coupling that should be used.
    The spline root is usually flat and has a crown on 1 side. The crowned spline has a symmetrical crown at the centerline of the face-width of the spline. As the spline length decreases toward the ends, the teeth are becoming thinner. The tooth diameter is measured in pitch. This means that the male spline has a flat root and a crowned spline.


    Spindle couplings are used in rotating machinery to connect 2 shafts. They are composed of 2 parts with teeth that engage each other and transfer load. Spline couplings are commonly over-dimensioned and are prone to static and fatigue behavior. Wear phenomena are also a common problem with splines. To address these issues, it is essential to understand the behavior and predictability of these couplings.
    Dynamic behavior of spline-rotor couplings is often unclear, particularly if the system is not integrated with the rotor. For example, when a misalignment is not present, the main response frequency is 1 X-rotating speed. As the misalignment increases, the system starts to vibrate in complex ways. Furthermore, as the shaft orbits depart from the origin, the magnitudes of all the frequencies increase. Thus, research results are useful in determining proper design and troubleshooting of rotor systems.
    The model of misaligned spline couplings can be obtained by analyzing the stress-compression relationships between 2 spline pairs. The meshing force model of splines is a function of the system mass, transmitting torque, and dynamic vibration displacement. This model holds when the dynamic vibration displacement is small. Besides, the CZPT stepping integration method is stable and has high efficiency.
    The slip distributions are a function of the state of lubrication, coefficient of friction, and loading cycles. The predicted wear depths are well within the range of measured values. These predictions are based on the slip distributions. The methodology predicts increased wear under lightly lubricated conditions, but not under added lubrication. The lubrication condition and coefficient of friction are the key factors determining the wear behavior of splines.

    China Hot selling Worm Drive High Performance Butterfly Valve Wafer Lug Cast Iron Butterfly Valve   with Hot sellingChina Hot selling Worm Drive High Performance Butterfly Valve Wafer Lug Cast Iron Butterfly Valve   with Hot selling