Is the selection of the valve in front of the pressure gauge based on experience or on standards?

Features of globe valves: good regulation performance, relatively poor sealing performance, a simpler structure than gate valves, easier manufacturing and maintenance compared to gate valves, higher fluid resistance, and a lower price than gate valves. Selection criteria: 1. Globe valves are suitable for use in pipelines or devices handling high-temperature and high-pressure media ； For high-temperature and high-pressure pipelines in power plants and petrochemical systems, globe valves are the appropriate choice ； 2. In pipelines where the requirement for convective resistance is not strict, that is, in areas where pressure loss is not a major concern ； 3. For small valves, globe valves can be used, such as needle valves, instrument valves, sampling valves, pressure gauge valves, etc ； 4. Where flow or pressure regulation is required, but the precision of such regulation is not high, and the pipe diameter is relatively small – such as in pipes with a nominal diameter of ≤50 mm – globe valves or throttle valves are suitable choices ； 5. In water supply and heating systems used in urban construction, for pipelines with a small nominal diameter, globe valves, balance valves, or plug valves can be used, especially in pipelines whose nominal diameter is less than 150 mm ； 6. Suitable for pipelines carrying media such as steam with a DN200 or lower ； 7. Not suitable for media with high viscosity ； 8. Not suitable for media containing particles that tend to precipitate ； 9. It is not suitable as a vent valve or a valve for low-vacuum systems. Features of gate valves: good sealing performance, low fluid resistance, and certain regulating capability ； However, it has a large size and complex structure, making processing difficult; its sealing surfaces wear easily, repair is challenging, and the opening and closing time is long. Suitable for manufacturing large-diameter valves, they are applicable not only to media such as steam and oils but also to media containing particulate solids and those with high viscosity; they are also suitable as valves for venting and low-vacuum systems. Selection criteria: I. Plate gate valves 1. Applicable medium range: water, steam, oils, oxidizing and corrosive media (Z42W-16Ti), acids, alkalis, flue gases, etc. 2. Ball valves are suitable for media such as steam, high-temperature oils, and gas-oil mixtures, as well as in applications where frequent opening and closing occur; they are not appropriate for media prone to coking ； 3. For urban gas transmission pipelines, single-plate or double-plate soft-seal straight-stem flat gate valves should be used ； 4. For urban water supply systems, single-plate or double-plate flat gate valves without guide posts are used ； 5. For pipes with suspended particulate media, use knife-edge flat gate valves ； II. Wedge Gate Valve 1. It is generally suitable only for full open or full closed positions, and cannot be used for regulation or throttling ； 2. It is generally used in situations where there are no strict requirements regarding the external dimensions of the valve, and the operating conditions are quite harsh. Such as high-temperature and high-pressure working media, where it is required that the sealing components maintain a seal over the long term, and so on ； 3. Generally, when reliable sealing performance is required under certain operating conditions or requirements, such as high pressure, high-pressure shut-off, low-pressure shut-off, low noise, the presence of cavitation and vaporization phenomena, high-temperature media, or low-temperature cryogenic conditions, wedge gate valves are recommended. It is widely used in fields such as petrochemicals and petroleum, water supply and sewage treatment projects in urban construction, as well as the chemical industry ； 4. Suitable for applications that require low flow resistance, high flow capacity, good flow characteristics, and tight sealing ； 5. Use wedge gate valves for high-temperature and high-pressure media ； Such as high-temperature steam, high-temperature and high-pressure oils. 6. For low-temperature and cryogenic media such as liquid ammonia, liquid hydrogen, liquid oxygen, etc., wedge-type gate valves should be used ； 7. For low-pressure, large-diameter applications such as water supply systems and sewage treatment plants, wedge gate valves are used ； 8. Use a dark-stem type when height is limited; use a bright-stem gate valve when the installation height is not restricted ； 9. In applications where frequent opening and closing are not required, wedge gate valves are a suitable choice ； 10. Wedge-type single-plate gate valves are suitable for high-temperature media that tend to form coke; wedge-type double-plate gate valves are appropriate for steam, oils, and media that cause significant wear on the sealing surfaces, as well as in applications where frequent opening and closing occur. They are not suitable for media that tend to form coke ； Ball valve features: simple structure, rapid on/off operation, easy to use, small size, light weight, few components, minimal fluid resistance, and good sealing performance. Selection criteria: 1. Suitable for media with low temperatures (≤150°C), high pressure, and high viscosity ； 2. It cannot be used for flow regulation ； 3. Used in applications requiring rapid opening and closing ； 4. Generally, ball valves are recommended for applications that require two-position control, high sealing performance, resistance to wear, use in channels with reduced diameters, fast opening and closing actions, high-pressure shutdown (large pressure difference), low noise levels, presence of vaporization phenomena, low operating torque, and low fluid resistance ； 5. Also suitable for light structures, low-pressure shut-off, and corrosive media ； 6. The ideal valve for use with low-temperature and cryogenic media; for piping systems and devices involving such media, low-temperature ball valves equipped with valve caps are recommended ； 7. Most ball valves can be used in media containing suspended solid particles; depending on the sealing material, they can also be used for powdered and granular media ； 8. When selecting a floating ball valve, its seat material must be able to withstand the full load exerted by the ball and the working medium. Larger-diameter ball valves require more force to operate; for ball valves with a DN of 200 mm or more, a worm gear drive should be used ； 9. For high-pressure, large-diameter (tank bottom valves with DN greater than 200 mm) ball valves, fixed-ball ball valves should be used ； 10. In corrosive media such as acids and alkalis in chemical processing systems, it is advisable to use all-stainless-steel ball valves made of austenitic stainless steel, with polytetrafluoroethylene as the seat seal.

I need both; I need experience, and it needs to be fast. But of course the experience has to meet the requirements – failing to do so can have negative consequences.

What standards or regulations are used as a reference?