FIELD: transport.
SUBSTANCE: set of inventions relates to pipeline fittings and is designed as fluid flow rate controls for fluid pressure equalisation. Disk shutter to be used together with internal valve includes the first body with the first locking surface to control fluid flow rate through the valve. This body has the second locking surface located opposite the first one and intended for control of fluid flow rate through the valve. In the body there is hole for passing valve stem and channel located coaxially with hole for stem and surrounded by the first locking surface to accept at least either seal or carriage. At least one through channel piercing the first body connects by fluid channel chamber with other chamber. At least one through channel has a hole located between hole for stem and the second locking surface. The carriage has external surface capable to perform sliding movement thus sealing the channel formed in the body. There are versions of fluid flow rate controls execution.
EFFECT: set of inventions is aimed to improve operation reliability and durability.
27 cl, 11 dwg
