GOST
GOST 28343-89 Flanged steel ball valves. Technical requirements
GOST 9702-87 Conical and ball valves. Basic parameters.
GOST 21345-78 Conical, ball and cylindrical valves for Pnom to ≈16 MPa . General specification
GOST 28908-91 Ball and butterfly valves. End-to-end, face-to-face dimension.
GOST 14187-84 Conical valves. End-to-end, face-to-face dimension.