Basic knowledge of the hottest valve

2022-08-01
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Basic knowledge of valves

valves are the control components in the pipeline fluid transmission system. They are used to change the channel section and medium flow direction, and have the functions of diversion, cut-off, regulation, throttling, check, diversion or overflow pressure relief

valves used for fluid control range from the simplest stop valve to various valves used in extremely complex automatic control systems. The nominal diameter of valves ranges from extremely small instrument valves to industrial pipeline valves with a diameter of 10m. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can be from 1.3 х The operating temperature ranges from -269 ℃ to 1430 ℃. The valve can be controlled by various transmission modes, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic hydraulic, electric hydraulic, pneumatic hydraulic, spur gear, bevel gear drive, etc; It can act according to the predetermined requirements under the action of pressure, temperature or other forms of sensing signals, or simply open or close without relying on the sensing signals. The valve relies on the driving or automatic mechanism to make the hoist move up and down, slide, swing or rotate, so as to change the size of its flow channel area to achieve its control function

i use of valve

valve is a kind of pipeline accessory. It is a device used to change the channel section and medium flow direction, and control the movement of the transmitted medium. It has the functions of diversion, cut-off, adjustment, throttling, check, diversion or overflow pressure relief. Specifically, valves have the following uses:

1.1 block valves: connect or cut off the medium in each section of the pipeline. Such as gate valve, globe valve, ball valve, plug valve, diaphragm valve, butterfly valve, etc

1.2 regulating valves: regulating the flow and pressure of the medium in the pipeline. Such as throttle valve, regulating valve, pressure reducing valve, safety valve, etc

estimate the performance in the trial application, based on the product model and prototype, the properties of material selection and personal experience, stop measuring the consumed products in the assembly line, and estimate whether the designed product can have excellent performance in the trial application.

inspection and adjustment of tensile testing machine:

1.3 diverter valve: change the flow direction of the medium in the pipeline for distribution, separation or mixing of the medium. Such as distribution valve, three-way plug valve, three-way or four-way ball valve, drain valve, etc

ii classification of valves

there are many types of valves. With the continuous improvement of the process flow and performance of various complete sets of equipment, the types of valves are still increasing, but in general, they can be divided into two categories:

2.1 automatic valves

valves that act by themselves depending on the capacity of the medium (liquid, gas, steam, etc.). Such as safety valve, check valve, pressure reducing valve, drain valve, hydraulic control valve, emergency shut-off valve, exhaust valve, etc

2.2 it is used for interior insulation in the soil covering of roof, ground and basement walls. It is very suitable for driving valves

valves operated by manual, electric, hydraulic and pneumatic means. Such as gate valve, stop valve, throttle valve, butterfly valve, ball valve, balance valve, plunger valve, plug valve, etc

the valve depends on the automatic or driving mechanism to make the hoist move up and down, slide, swing or swing, so as to change the size of its flow channel area to achieve its control function

in addition, there are several classification methods for valves

2.3 according to structural features

it can be divided into:

2.3.1 sectional shape: the closure moves along the center line of the valve seat

2.3.2 gate shape: the hoist moves in the direction perpendicular to the center line of the valve seat

2.3.3 cock and ball: the hoist is a plunger or ball that rotates around its own axis

2.3.4 swing type: the hoist rotates around the axis outside the valve seat

2.3.5 butterfly shape: the disc of the hoist rotates around the axis inside the valve (central line type) or outside the valve seat (eccentric type)

2.3.6 slide valve shape: the hoist slides upward in the direction perpendicular to the channel

2.4 classification by operation method: according to different operation methods, it can be divided into:

2.4.1 manual valve -- with the help of handwheel, handle, wrench, lever or sprocket, etc. When the valve operated by manpower needs to transmit large torque, it can be equipped with worm gear, gear and other reducer rotors, and can also be used for the test pump of compressive strength of other non-metallic materials

2.4.2 electric valve - a valve operated by means of motor, electromagnetic or other electrical devices

2.4.3 hydraulic or pneumatic valves - valves operated by liquid (water, oil and other liquid media) or gas

2.4.4 automatic valve -- a valve that acts by itself depending on the capacity of the medium (liquid, gas, steam)

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