10с-7-3Э

The control needle valves are used as fluid flow regulators.
The provision of smooth control within the limits of the rated throughput capability is achieved with the help of the valve needle form. The seat has reinforced hard-facing of increased hardness which is resistant erosive and corrosive wear.
They are not used as shutoff devices.

According to the actuator type of the working body and control method, the
control needle valves are divided into the following types:

• Lever-operated control needle valves. The valve control is carried out on a
  remote basis (automatically) with actuators of single-turn electric actuator type
  (МЭО) through the lever. The allowed pressure differential on the valve shall not
  exceed 1 MPa.
• Control needle valves. The valve control is carried out with a handwheel or an
  actuator with a current position sensor of electric multi-turn actuator types
  (ПЭМ) (ABS ZEIM Automation), SAR (AUMA) or linear pneumatic actuators
  FESTO, VALBIA, AIR Torque, ROTORK etc., chosen considering the working
  medium pressure and air pressure. The valves equipped with actuators shall be
  only installed on horizontal pipeline sections with the actuator position
  upwards.
• Control angle valves. The valves are controlled with a built-in multi-turn electric
  actuator with a current position sensor of electric multi-turn actuator / electric
  multi-turn mechanism types (ПЭМ/МЭМ) (ABS ZEIM Automation), SAR (AUMA)
  etc. or linear pneumatic actuators of electric multi-turn actuator types (МЭП)
  (ABS ZEIM Automation), REGADA etc., chosen considering the working medium
  pressure.

According to GOST 356-80, the valves designed for the ultimate pressure allow
their application on operating parameters within the following range:
— at PN 100 MPa – from 10 MPa, 200 °С to 3,6 MPa, 455 °С;
— at PN 63 MPa – from 6,3 MPa, 200 °С to 2,3 MPa, 455 °С;
— at PN 25 MPa – from 25 MPa, 200 °С to 9 MPa, 455 °С.