Model of the check valve
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Is there an H44H model for check valves?
Each letter and digit in H44H has a specific meaning: H denotes the valve type, which is a check valve; 4 indicates that the valve is driven by spur gears; 4 also indicates that the valve is connected using flanges; H signifies that the check valve has a single-disc structure. Therefore, H44H refers to a check valve with spur gear drive, a single-disc design, and flange connections. Actually, a valve should have a complete code; I won’t go into details unless you ask. Read the book by yourself and you’ll understand right away.
General notation for check valves: “H44H-25P DN80”. The first digit “H” indicates that the valve type is a check valve. The second digit “4” denotes flange connection. The third digit “4” indicates it is a single-disc swing check valve. The fourth digit “H” signifies that the sealing and lining material is alloy steel. The fifth digit “25” represents a nominal pressure of 25 kg/cm2 (it can also be 6, 10, 40, 64, etc.; this is just an example). The sixth digit “P” indicates that the valve body material is 1Cr18Ni9Ti (although other materials can also be used). “DN80” denotes a nominal diameter of 80 mm (other sizes are also possible; this is just an example). Swing check valves can be installed in horizontal pipes or in vertical pipes where the fluid flows from bottom to top； There is also a straight-through lift check valve of the “H41H” type that can only be installed in horizontal pipes (vertical lift check valves can be installed in vertical pipes). Swing check valves are suitable for large-diameter pipes; those with a nominal diameter of less than 50 mm generally do not exist, and their sealing performance is also inferior to that of lift check valves. Great care must be taken when selecting check valves.
It is recommended to refer to the chapter on valves in the \"Reference Manual for the Design of Petrochemical Pipeline Installation\", which provides detailed information
Flange-connected types include H44H swing-type, H42H vertical lifting type, and H41H lifting type
I learned it~~ You need to look it up in a specialized book ~~
This really exists. It is a swing check valve