Shut-off unit (V46.2, V46.0) or rough control unit (V40.2) with linear characteristic is designed for the use with water, steam, gas and other working media. It is used in chemical and nuclear equipment depending on body material selection.
Throttle device (В25) is used for continuous alkali removal from steam boilers, quick-opening unit (В10) is used for hot sewage water discharge. In itself it is not shut-off valve. So if it is necessary to ensure leakproofness, shut-off valves are to be installed to pipeline. These devices are designed for normal, tropical or seismic environment.
V46.2, V40.2 - Control is executed via flywheel, electric actuator (as well as for seismic version), bevel gear, and direct drive in case of remote control. It is possible to furnish the flywheel-controlled valves with locking device.
В10 - Control is executed via two flywheels. Valve is opened or closed by rotation of big flywheel. At rotation of minor flywheel once retaining nut is released mutual cleaning of contaminated sealing faces occurs. Cleaning must be performed several times to discharge boiler deposit at quick flow break.
В25, V46.0 – Flywheel-controlled
Depending on working conditions and body material valves are tested for strength, impermeability, serviceability and leakproofness with water and sometimes with steam. Minimum pressure for strength test made of 1,5PN. In case of flanged connection body-to-flange weld seam is inspected ultrasonically.
Valves are mounted in whatever position with flow directed under slide valve. Mounting of electric-actuated gates is performed in accordance with manufacturer’s recommendations. In case of remote control maximum displacement angle of extension stem made of 25°. Electric connections and gear connections to valves are as per ISO 5210 and DIN3210, ОСТ26-07-763. Valves with such type of control are secured especially for seismic impact. Control valves equipped with electric actuator МОА are installed in complete with contact box with brake.
V46.2, V40.2, В10, В25 - Body is made of free forging with separate body and cast yoke. Body seat is hard-faced. Slide valve and spindle with sealing face are made of hard alloy as well. Gland is made of asbestos-free material. Flanged valves have flanges welded to body.
V46.0 – Body is made of pressed-out forging with seat made of austenitic material. Slide valve and spindle are single part with sealing faces hard-faced with cobalt-free alloy