Technical analysis of straight-through check valve

I. Structural type and characteristics
‌Lifting Inline Check Valve

The valve disc moves vertically along the center line of the valve body, and the inlet and outlet channels are linear. The structure is compact and the sealing surface wears evenly. It is suitable for small-diameter pipes of DN15~200mm‌1.
Typical models include H41H-16C (carbon steel) and H41W-64P (duplex steel 2205), with a working pressure range of PN16~PN64 and a suitable temperature of -29~300℃‌24.
‌Butterfly straight-through check valve‌

Adopting a wafer-type design, the valve disc is a double-disc or single-disc disc structure, which is quickly opened and closed by springs or medium pressure, with a low flow resistance coefficient (about 0.05), suitable for DN50~1200mm pipes‌16. Representative models are H76H-16P (stainless steel 316L) and H76X-250P (duplex steel 2507), which can withstand Class 150~2500 pressure levels ‌35.
2. Core application scenarios ‌Industrial fluid control ‌
When transporting acid and alkali media in chemical plants, the H41W-64P model made of duplex steel 2205 is selected, which is resistant to concentrated sulfuric acid corrosion and has a sealing surface hardness of HRC40 or above ‌45.
The oil pipeline system uses H76X-250P wafer butterfly check valve, which can withstand hydrogen sulfide media and 25MPa high-pressure environment ‌57.
‌Municipal and building systems ‌
H41T-10K brass lift check valve is used in fire water supply networks to prevent water hammer impact, and the opening and closing pressure difference is ≤0.04MPa ‌1.
The HVAC system is adapted to the H76H-16P stainless steel butterfly check valve, saving more than 50% of the installation space ‌16. 3. Installation and maintenance points
‌Installation specifications‌
For horizontal pipelines, lift-type straight-through check valves are preferred, and vertical structures (such as H42W series) are required for vertical pipelines. The direction of the valve body arrow must be consistent with the flow direction of the medium‌17.
When installing the clamp-type valve, the flange parallelism must be calibrated, and the bolt preload must be controlled at 70~120N·m to prevent the valve body from deforming‌15.
‌Maintenance requirements‌

Check the valve disc and valve seat sealing surface every 6 months. If the scratch depth is ≥0.1mm, it needs to be ground and repaired‌5.
Under the working conditions of the medium containing particles, it is recommended to clean the valve cavity every 3 months to prevent impurities from blocking the movement of the valve disc‌.