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Our mission: To fully utilize the effectiveness of industrial control valves to achieve better results
1. Gate valve
Gate valve refers to a valve whose closing member (gate) moves in the vertical direction of the channel axis, and is mainly used to cut off the medium on the pipeline, i.e., fully open or fully closed. Generally, gate valves cannot be used to regulate flow. It can be applied to low temperature and high pressure as well as high temperature and high pressure, and can be made of different materials according to the valve. However, gate valves are generally not used in pipelines conveying media such as mud
advantage:
① Low fluid resistance;
② The torque required for opening and closing is small;
③ It can be used in a loop network pipeline where the medium flows in two directions, which means that the flow direction of the medium is not limited;
④ When fully open, the sealing surface is less eroded by the working medium than the stop valve;
⑤ The body structure is relatively simple and the manufacturing process is good;
⑥ The structure length is relatively short.
Disadvantages:
① The overall dimension and opening height are large, and the installation space required is also large;
② During the opening and closing process, the sealing surface is subject to relative friction and large friction loss, which can easily cause scratches even at high temperatures;
③ Generally, gate valves have two sealing surfaces, which adds some difficulties to processing, grinding, and maintenance;
④ Long opening and closing time.
2. Butterfly valve
Butterfly valve is a valve that uses a disc type opening and closing device to rotate back and forth about 90 ° to open, close, and regulate the fluid channel.
advantage:
① Simple structure, small size, light weight, low consumption, not suitable for use in large diameter valves;
② Quick opening and closing, small flow resistance;
③ It can be used for media with suspended solid particles, and can also be used for powdery and granular media depending on the strength of the sealing surface. It is suitable for two-way opening, closing, and adjustment of ventilation and dust removal pipelines, and is widely used in gas pipelines and waterways in metallurgical, light industry, electric power, petrochemical systems, etc.
Disadvantages:
① The flow adjustment range is not large, and when the opening reaches 30%, the flow will increase by more than 95%;
② Due to the limitations of the structure and sealing materials of butterfly valves, they are not suitable for use in high-temperature and high-pressure pipeline systems. The general working temperature is below 300 ℃ and below PN40;
③ Compared to ball valves and globe valves, the sealing performance is poor, so it is used in places where the sealing requirements are not very high.
3. Ball valve
The ball valve is evolved from the plug valve, and its opening and closing member is a ball, which is rotated 90 ° around the axis of the valve stem to achieve the purpose of opening and closing. Ball valves are mainly used in pipelines to cut off, distribute, and change the flow direction of media. Ball valves designed with V-shaped openings also have good flow regulation functions.
advantage:
① Has a low flow resistance (actually 0);
② It can be reliably applied to corrosive media and low boiling point liquids because it does not get stuck during operation (when there is no lubricant);
③ Fully sealed in a wide range of pressure and temperature;
④ It can achieve rapid opening and closing, and the opening and closing time of some structures is only 0.05~0.1s to ensure that it can be used in the automation system of the test bench. When quickly opening and closing the valve, there is no impact during operation;
⑤ The spherical closure can be automatically positioned at the boundary position;
⑥ The working medium is reliably sealed on both sides;
⑦ During full opening and full closing, the sealing surfaces of the ball and valve seat are isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface;
⑧ Due to its compact structure and light weight, it can be considered as a reasonable valve structure for cryogenic media systems;
⑨ The valve body is symmetrical, especially the welded valve body structure, which can well withstand the stress from the pipeline;
⑩ The closing element can withstand the high pressure difference during closing The ball valve with a fully welded body can be directly buried underground, preventing the valve internals from being corroded, and has a high service life of up to 30 years. It is an ideal valve for oil and natural gas pipelines.
Disadvantages:
① Because the main valve seat sealing ring material for ball valves is polytetrafluoroethylene, which is inert to almost all chemical substances, and has comprehensive characteristics such as low friction coefficient, stable performance, resistance to aging, wide range of temperature applications, and excellent sealing performance. However, the physical characteristics of polytetrafluoroethylene, including its high coefficient of expansion, sensitivity to cold flow, and poor thermal conductivity, require that the design of the valve seat seal must revolve around these characteristics. Therefore, when the sealing material hardens, the reliability of the seal is destroyed. Moreover, the temperature resistance level of polytetrafluoroethylene is relatively low, and it can only be used at temperatures below 180 ℃. Beyond this temperature, the sealing material will age. When considering long-term use, it is generally not used at 120 ℃.
② Its regulating performance is worse than that of a shut-off valve, especially for pneumatic valves (or electric valves).
4. Stop valve
A valve in which the closing member (disc) moves along the centerline of the valve seat. According to this form of movement of the valve disc, the change in the valve seat opening is in direct proportion to the valve disc stroke. Due to the relatively short opening or closing stroke of the valve stem, as well as the very reliable cutoff function, and because the change in the valve seat opening is proportional to the stroke of the valve disc, this type of valve is very suitable for regulating flow. Therefore, this type of valve is very often used for shutoff or adjustment as well as throttling.
advantage:
① During the opening and closing process, the friction force between the valve flap and the valve body sealing surface is smaller than that of the gate valve, so it is wear-resistant.
② The opening height is generally only 1/4 of the valve seat channel, so it is much smaller than the gate valve;
③ Generally, there is only one sealing surface on the valve body and valve flap, so the manufacturing process is relatively good and convenient for maintenance;
④ Due to the fact that its filler is generally a mixture of asbestos and graphite, it has a high temperature resistance rating. Generally, steam valves use globe valves.
Disadvantages:
① Due to the change in the flow direction of the medium through the valve, the small flow resistance of the stop valve is also higher than that of most other types of valves;
② Due to the long stroke, the opening speed is slower than the ball valve.
5. Plug valve
It refers to a rotary valve with a plunger shaped closure, which can be opened or closed by rotating the passage port on the valve plug through 90 ° to connect or separate the passage port on the valve body. The shape of the valve plug can be cylindrical or conical. Its principle is basically similar to that of ball valves, which are developed on the basis of plug valves. They are mainly used for oil field exploration and also for petrochemical industry.
6. Safety valve
It refers to being used as an overpressure protection device on pressure vessels, equipment, or pipelines. When the pressure in the equipment, container, or pipeline increases beyond the allowable value, the valve automatically opens, and then fully discharges to prevent the equipment, container, or pipeline from continuing to increase in pressure; When the pressure drops to a specified value, the valve should automatically and timely close to protect the safe operation of equipment, containers, or pipelines.
7. Steam trap
During the transportation of steam, compressed air, and other media, some condensed water may form. In order to ensure the working efficiency and safe operation of the device, it is necessary to timely discharge these useless and harmful media to ensure the consumption and use of the device. It has the following functions: ① it can quickly remove the generated condensed water; ② Prevent steam leakage; ③ Remove air and other non condensable gases.
8. Pressure reducing valve
It is a valve that reduces the inlet pressure to a desired outlet pressure through adjustment, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure.
9. Check valve
Also known as reverse flow valve, check valve, back pressure valve, and one-way valve. These valves are automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, and belong to an automatic valve. Check valves are used in pipeline systems to prevent media backflow, reverse rotation of pumps and drive motors, and discharge of container media. "Check valves can also be used on pipelines that provide makeup to auxiliary systems in which the pressure may rise above the system pressure. They are mainly divided into swing type (rotating according to the center of gravity) and lift type (moving along the axis).".
