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This classification method is divided by principle, function and structure, and is the most commonly used classification method at home and abroad. Generally, there are gate valves, globe valves, throttle valves, instrument valves, plunger valves, diaphragm valves, plug valves, ball valves, butterfly valves, check valves, pressure reducing valves, safety valves, traps, regulating valves, bottom valves, filters, blowdown valves, etc. Because the valve is widely used, so it plays a great role. For example, in power plants, valves can control the operation of boilers and steam turbines; In petroleum and chemical production, valves also play a role in controlling the normal operation of all production equipment and process flow. The same is true in other departments. However, valves are often overlooked when compared with other products. For example: in the installation of machinery and equipment, people tend to focus on the main machinery and equipment, but ignore the valve. This will reduce the efficiency of the whole production or stop production, or cause a variety of other accidents. Therefore, the selection, installation, use of valves must be serious and responsible work. Electric drive valve is a commonly used driving mode of the valve, usually called the driving device in the form of the valve electric device, the characteristics of the valve electric device are as follows: 1) fast opening and closing, can greatly shorten the time required to open and close the valve; 2) can greatly reduce the labor intensity of the operator, especially suitable for high pressure, large diameter valve; 3) Suitable for installation in the position that can not be operated manually or is difficult to access, easy to achieve remote control, and the installation height is not limited; 4) Conducive to the automation of the whole system; 5) The power supply is easier to obtain than the air and liquid sources, and the laying and maintenance of the wire is much simpler than the compressed air and hydraulic pipelines. The disadvantages of valve electric devices are complex construction, more difficult to use in wet places, for explosive media, need to use flameproof measures. Valve electric device according to the type of valve driven, can be divided into Z type and Q type two categories. The output shaft of Z-type valve electric device can turn out many circles, suitable for driving gate valve, globe valve, diaphragm valve, etc.; The output shaft of the Q-valve electric device can only rotate 90. Applicable to drive plug valve, ball valve and butterfly valve. According to its protection type, there are common type, flameproof type (represented by B), heat resistant type (represented by R) and triad type (i.e. outdoor, anti-corrosion, flameproof, represented by S). The valve electric device is generally composed of transmission mechanism (reducer), motor, stroke control mechanism, torque limiting mechanism, manual - electric switching mechanism, opening indicator, etc. Pneumatic and hydraulic valves Pneumatic valve and hydraulic is a certain pressure of air, water or oil as the power source, the use of cylinder (or hydraulic cylinder) and piston movement to drive the valve, the general pneumatic air pressure is less than 0.8MPa, hydraulic pressure or oil pressure is 2.5MPa~25MPa. Or diaphragm valve; Return transition gas and liquid drive devices for drive devices used to drive ball valves, butterfly valves or plug valves. The driving force of hydraulic device is large, suitable for driving large caliber valves. For example, when used to drive plug valves, ball valves and butterfly valves, the reciprocating motion of the piston must be converted into a rotary motion. In addition to the use of cylinder or hydraulic cylinder piston to drive, there is no use of pneumatic film driven, because of its stroke and driving force is small, so mainly used for regulating valve. Manual valve Manual valve is the most basic actuation mode of the valve. It includes two kinds of direct drive by hand wheel, handle or plate hand and drive by transmission mechanism. When the opening torque of the valve is large, it can be driven by gear or worm drive to achieve the purpose of omission. Gear drive is divided into spur gear drive and cone gear drive. Gear drive reduction ratio is small, suitable for gate and globe valves, worm gear drive reduction is larger, suitable for plug valves, ball valves and butterfly valves

2022

Classification of valves

(1) truncation: such as gate valve, globe valve, plug valve, ball valve, butterfly valve, needle valve, diaphragm valve, etc. Truncated valve, also known as closed circuit valve, cut-off valve, its role is to connect or cut off the medium in the pipeline. (2) Check type: such as check valve, check valve is also known as check valve or check valve, check valve belongs to an automatic valve, its role is to prevent the pipeline medium backflow, prevent the pump and drive motor reversal, and the leakage of the container medium. Water pump suction close the bottom valve also belongs to the check valve class. (3) Safety: such as safety valve, explosion-proof valve, accident valve, etc. The function of the safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection. (4) Regulation class: such as regulating valve, throttle valve and pressure reducing valve, its role is to adjust the pressure of the medium, flow and other parameters. (5) shunt class: such as distribution valve, three-way valve, trap. Its function is to distribute, separate or mix the medium in the pipeline. (6) Special purpose: such as pigging valve, vent valve, drain valve, exhaust valve, filter, etc. Exhaust valve is an indispensable auxiliary component in pipeline system, widely used in boiler, air conditioning, oil and gas, water supply and drainage pipeline. It is often installed at the commanding point or elbow to eliminate excess gas in the pipeline, improve the efficiency of road use and reduce energy consumption.

2022

The characteristics of ball valves

ball valve (ball valve in the field of Marine engineering and ship should be globe valve), standard GB/T21465-2008 "Valve terminology" is defined as: the opening and closing parts (ball) driven by the stem, and around the ball valve axis for rotating movement of the valve. Can also be used for fluid regulation and control, the hard seal V-type ball valve has a strong shear force between the V-type ball core and the metal seat of hardmetal alloy surfacing, especially suitable for medium containing fiber, small solid material. The multi-pass ball valve can not only flexibly control the confluence, shunt, and flow direction switch of the medium on the pipeline, but also close any channel and make the other two channels connected. Valves of this type should generally be installed horizontally in the pipeline. Ball valve classification: pneumatic ball valve, electric ball valve, manual ball valve.

2022

How the globe valve works

Globe valve, also known as the door stop, is the most widely used valve, it is popular, because the friction between the sealing surface in the process of opening and closing is small, relatively durable, opening height is not large, easy to manufacture, convenient maintenance, not only suitable for low and medium pressure, but also suitable for high pressure. The closing principle of the globe valve is to rely on the valve bar pressure, so that the valve disc sealing surface and seat sealing surface closely fit, prevent the flow of media. Globe valve The globe valve only allows one-way flow of media, and has directionality when installed. The structure length of the globe valve is longer than the gate valve, and the fluid resistance is large, and the sealing reliability is not strong in the long-term operation. Illustration of wire stop valve

2022

Performance of knife gate valves

1. Valve control can be local and remote control, but also according to user requirements to achieve remote position display and remote centralized control. 2. Light weight: the body is made of carbon steel, the weight is about 20%-30% less than the traditional gate valve, easy to install and maintain. 3. The use of the valve can improve the sealing performance of the conveying pipeline system, prevent leakage to the maximum extent, improve production efficiency, protect the environment will play a positive role in promoting. 4. Sealing surface with high wear resistance, corrosion resistant ceramic materials, Mosaic technology, high corrosion resistance, good wear resistance, so that the valve life is long, cost-effective than the ordinary valve is increased 10 times.

2022

Butterfly valve folding common failure

Valves can be used to control the flow of air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluids. In the pipeline mainly plays the role of cutting and throttling. Butterfly valve opening and closing part is a disc shaped butterfly plate, in the valve body around its own axis, so as to achieve the purpose of opening and closing or adjustment.

2022

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Founded in 1993, after 19 years of development, it has become one of the large valve manufacturing bases in Tianjin, China....

Tianshun Valve Industry Co., Ltd

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Address: 300459, No. 88, Zhuhai Road, Tanggu Ocean High-tech Zone, Binhai New Area, Tianjin

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