Replying to Gator:
The manufacture is CONTROLFLUID SRL
It's an old modeled valve & i've tried contacting them to get the related data sheet with no reply.
Replying to LittleInch:
A drawing isn't available.
My concern that overload may exist on the rest of the bolts as these bolts are 1,2,15,16 (...
There's a wafer check valve # 900 which is installed with four semi-attached stud bolts (Locations # 1,2,15,16).
The valve is installed on a high pressure gas piping system with design pressure 110 bar & operating temp. 54 C
Even though the outer diameter of the four holes (53.5mm) is larger...