Valve basic knowledge and classification (a) valve details! Here’s everything you don’t know about Angle valves

Valve basic knowledge and classification (a) valve details! Here’s everything you don’t know about Angle valves

Valve is oil, chemical Ding:, power station, long discovery pipeline, paper making, nuclear industry, all kinds of cryogenic engineering, aerospace and offshore oil and other flow control parts of the transport system, with diversion, cut-off, regulation, throttling, prevent countercurrent, diverting or flow pressure relief functions. Valves for fluid control range in variety and specification from simple truncation devices to extremely complex automatic control systems. The valve is to rely on dipping or white moving mechanism to make its opening and closing parts for lifting, sliding, spinning or rotating motion, so as to change the size of its flow area, to achieve the control function.
Valve is oil, chemical Ding:, power station, long discovery pipeline, paper, nuclear industry, all kinds of cryogenic engineering, aerospace and offshore oil and other flow control parts of the transport system, with diversion, cut-off, regulation, throttling, prevent countercurrent, shard or flow pressure relief functions.
Valves for fluid control range in variety and specification from simple truncation devices to extremely complex automatic control systems. The nominal size of valves ranges from very small instrument valves to industrial pipeline valves with nominal sizes up to 10 m and weighing dozens of tons. Valves can be used to control air, water, steam, all kinds of corrosive chemical media mud, oil, liquid metal and radioactive fluid and other types of fluid flow. Valve working pressure can be from 1.3× 10-3MPa to 1000MPa. Operating temperature from -269℃ to 1430℃ high temperature. Valve control can adopt a variety of transmission methods, such as manual, electric, pneumatic, hydraulic, electric or electric hydraulic linkage and electromagnetic drive; Can also be under the action of pressure, temperature or other forms of sensing bow, according to the predetermined requirements of action, or simply open or close. The valve is to rely on dipping or white moving mechanism to make its opening and closing parts for lifting, sliding, spinning or rotating motion, so as to change the size of its flow area, to achieve the control function.
1. Valve classification Valve variety, with the continuous improvement of all kinds of complete sets of equipment process flow and performance, valve types are still increasing, and there are a variety of classification methods.
1, according to automatic and drive classification
(1) Automatic valves rely on the ability of the medium (liquid, air, steam, etc.) to operate on its own, such as safety valves, check valves, pressure reducing valves, steam traps, air traps, emergency cut-off valves, etc.
(2) Drive valve Valve operated by hand, electric, hydraulic or pneumatic. Such as gate valve, globe valve, throttle valve, butterfly valve, ball valve, plug valve, etc.
2. Classification by use and function
(1) truncation valve is mainly used to truncate or connect the medium flow in the pipeline. Such as globe valve, gate valve, ball valve, plug valve, butterfly valve, diaphragm valve, etc.
(2) Check valves are used to prevent media backflow. Such as a variety of different structures of the check valve.
(3) Regulating valves are mainly used to adjust the pressure and flow of the pipeline medium. Such as regulating valve, throttle valve, reducing valve and so on.
(4) The shunt valve is used to change the direction of the flow of the medium in the pipeline, and plays the role of distributing, shunt or mixing the medium. Such as a variety of structure of distribution valve, tee or four-way cock, tee or four-way ball valve, various types of traps.
(5) safety valve is used for overpressure safety protection, discharge of excess media, to prevent the pressure from exceeding the specified value. Such as various types of safety valves.
(6) Multi-purpose valves are used to replace two, two or more types of valves, such as stop check valves, check ball valves, stop check safety valves, etc.
(7) Other special valves such as blowdown valve, blowoff valve, coke clearing valve, pigging valve emergency cut-off valve, etc.
3, according to the main technical parameters classification
1. Classification by nominal size
(1) Small diameter valve nominal size DN≤40mm, the valve.
(2) medium diameter valve nominal size DN50~300mm valve.
(3) large diameter valve nominal size DN350~1200mm valve.
(4) Large diameter valve nominal size DN≥1400mm valve.
3.2 Vacuum valves classified by nominal pressure — valves with working pressure lower than standard atmospheric pressure.
[2] Low pressure valve — nominal pressure PN≤1.6MPa valve:
(3) Medium pressure valve — nominal pressure PN2,.5~ 6.4 mpa valve:
(4) High pressure valve – nominal pressure PN10. 0~80. 0MPa valve.
(5) super high pressure valve – nominal pressure PN≥100MPa valve.
3.3 Classified by medium operating temperature
(]) High temperature valve t450℃ valve.
(2) medium temperature valve 120≤t≤450℃ valve.
{3) Normal temperature valve – 29℃ ≤t≤120℃ valve.
(4) Low temperature valve 100℃ ≤t≤ 29 ℃ valve.
(5) ** temperature valve t 100℃ valve.
3. 4 Classification by body material
(1) Non-metallic valves such as ceramic valves, glass steel valves, plastic valves
(2) Metal valves — such as copper alloy valve, lead alloy valve, titanium alloy valve, chin alloy valve, Monel valve, Hastelloy valve, cast iron valve, cast steel valve, low alloy steel valve, high alloy steel valve.
(3) Metal body lined valves – such as lead lined valves, plastic lined valves, enamel lined valves.
Valve details! Here’s everything you don’t know about Angle valves
If the Angle valve leaks, and it is found that the core of the Angle valve is broken, it can only change the Angle valve. If it is found that the leakage point of the Angle valve is at the interface, just re-wrap the sealing raw material belt and tighten it. In real life, the triangle valve on the water heater burst as soon as the new house of some owners was finished, which caused the pipes to leak and flooded the floor, TV cabinet, wardrobe, etc. This happens, usually because the quality of the Angle valve is not caused by. Therefore, in the process of home decoration, we must pay attention to the choice of good quality Angle valve don’t be penny wise and pound foolish.