Regarding the safety valve of vinyl chloride spheres

General rules for selecting safety valves. (l) Hot water boilers generally use unenclosed safety valves with a wrench for slight opening. (2) Steam boilers or steam pipes generally use unenclosed, wrench-operated full-opening safety valves. (3) Incompressible media such as water generally use closed micro-pivot safety valves, or safety relief valves. (4) Closed full-opening safety valves are generally used for high-pressure feed water, such as in high-pressure feed water heaters and heat exchangers. (5) Compressible media such as gases generally use closed full-opening safety valves, such as in gas storage tanks and gas pipelines. (6) Class E steam boilers generally use gravity-type safety valves. (7) Pulse-type safety valves are generally used in large-diameter, high-displacement, and high-pressure systems, such as temperature and pressure reduction devices and power plant boilers. (8) Internal safety valves are typically used in train tank cars, road tank trucks, and storage tanks for transporting liquefied gas, as shown in Figure 4. (9) Hydraulic safety valves are generally used at the top of oil tanks, and they need to be used in conjunction with breather valves. (10) Pilot-operated safety valves are generally used for underground drainage or gas pipelines. (11) Safety return valves are typically used on the liquid-phase return pipes at the outlet of tank pumps in LPG stations. (12) Systems that may experience negative pressure or negative pressure during operation generally use vacuum pressure relief valves. (13) Bellows safety valves are generally used for systems with large backpressure fluctuations and for containers or piping systems that are toxic or flammable. (14) For systems with a low freezing point of the medium, insulated jacketed safety valves are generally used. For specific requirements regarding safety valves on spherical tanks, see this forum post: http://bbs.hcbbs.com/viewthread.php?tid=66117

Are Anderson Greenwood’s safety valves very expensive?

What other brands offer similar three-way valves?

People near the vinyl chloride spherical tank, come and give it a try

The diameter of the safety valve should be determined through calculation; storage tanks with different capacities and operating conditions require safety valves of different diameters.

The spherical tanks we use are of 500 and 2000 capacity, and each is equipped with 3 DN150 safety valves

7th floor: How are the three DN150 connections on each spherical tank connected to the tank? Are there three openings on the tank, with ball valves connected to them respectively and safety valves as well? Or some other way? Explain in detail