May I ask what kind of check valve this is?

The specification of this check valve is ASTM A217-WC6 STL/STL CL900 RJ, which complies with API594 standard. And TYPE BMSSSP-144 Type B is its model number. PS-TILTING-DISC indicates that it uses a tilting valve disc design. As for the specific meaning of the last two rows, you need to refer to the technical manual of the product or ask the manufacturer for detailed information. .

According to the above information, the TILING DISC of type B check valves produced in accordance with API 594 standards indicates that the valve plate can tilt and rock. You know the information displayed by ASTM A217-WC6 STL/STL CL900 RJ. For others, check the manufacturer's instructions. API 594 B type valve as shown in the picture

The high-temperature alloy ring groove flange connects the swing check valve (the valve port is overlayed with carbide bonnet and adopts a self-tightening structure, that is, Wood seal). The closest picture

After looking at it, it seems that the difference with the swing check valve is that the valve seat is tilted, right?

Please check the manufacturer's instructions for specific details. The previous ones are basically universal.

This is a specification description of a check valve. Let me explain what each part means: ASTM A217: This is an American Society for Testing and Materials (ASTM) standard, standard specification for iron-based alloy castings used at high temperatures and pressures. ASTM A217 is mainly used in valves and other piping equipment. WC6: This is the material grade specified in ASTM A217. WC6 is a low-carbon martensitic alloy suitable for use at high temperatures. It usually has good strength and fatigue resistance in high-temperature environments. STL: STL is STL type check valve, which is the abbreviation of Solid Traplet. This means that this type of check valve has a carbide sealing surface and is suitable for use at high temperatures and pressures. CL900: This is the nominal pressure rating, which means that the design pressure of this check valve is 900 pounds (approximately 690 bar). RJ: This is the pipe size, indicating that the interface size of this check valve is RJ (Rose joint) type. API 594: This is an American Petroleum Institute (API) standard for inspection and testing methods of valves, pipelines and other equipment. API 594 specifies the testing and inspection requirements that valves must pass. BMSSSP-144: This may be a manufacturer-specific model or specification number for this check valve. Type B: This may refer to the structural type of the check valve. Usually different types of check valves have different working principles and structural characteristics. PS-TILTING-DISC: This may refer to the working principle of the check valve, and PS-TILTING-DISC may refer to the tilting plate structure of the check valve. Taken together, the specifications of this check valve are described as: The STL type check valve is manufactured in accordance with the ASTM A217 standard and has a material grade of WC6. The nominal pressure rating is 900 pounds (690 bar). The interface size is RJ type. It has passed the inspection of the API 594 standard. The manufacturer's specific model is BMSSSP-144, a type B tilting plate structure check valve.