Pipeline type adjusting needle valve

Abstract

The invention belongs to the technical field of ship equipment and particularly relates to a pipeline type adjusting needle valve. The pipeline type adjusting needle valve comprises a lead sealing block, a screw, cap nuts and a shell and is characterized in that the middle of the shell is provided with a central hole, the lower end and the lateral side of the shell are provided with oil ports, the lower end of the shell is provided with a threaded connector, a pipe connected is welded to the oil port on the lateral side of the shell, and flat-shoulder connectors are mounted on the pipe connector and the threaded connector through gaskets and the cap nuts; an adjusting valve rod is located in the shell, and the regulating valve rod and the shell are sealed through a composite gasket; a gland is mounted on the shell through a screw and a regulating gasket and compresses the composite gasket for sealing, the upper end of the gland is provided with a retaining groove, and pre-tightening and retaining is performed through a fastening screw after the regulating valve rod performs regulation; a cap is mounted on the shell through a thread, and lead sealing is performed through a low-carbon steel wire and the lead sealing block; the composite gasket is formed by formed by four convex-concave-phase-combined teflon gaskets which are identical in thickness and contact at a certain angle.

Description

Technical field: [0001] The invention belongs to the technical field of ship equipment, and in particular relates to a pipeline type regulating needle valve. Background technique: [0002] The needle valve currently used by ships to adjust the overspeed protection of the steam turbine is installed on the bearing box cover on the nose side above the speedometer. The speed regulating needle valve currently used mainly has the following disadvantages: 1. When the speed is adjusted, due to the high speed operation of the steam turbine unit, the bearing The ambient temperature near the box cover is very high, and the speed regulating needle valve is located between the bearing box and the main steam valve. The ambient temperature is too high and the needle valve cannot be adjusted, which leads to the delay of the test; 2. The throttle valve stem has no stroke limit, and an experienced operator must be used for each speed adjustment, otherwise it is easy to adjust the throttle val...

AI Technical Summary

Problems solved by technology

[0002] The needle valve currently used by ships to adjust the overspeed protection of the steam turbine is installed on the bearing box cover on the nose side above the speedometer. The speed regulating needle valve currently used mainly has the following disadvantages: 1. When the speed is adjusted, due to the high speed operation of the steam turbine unit, the bearing The ambient temperature near the box cover is very high, and the speed regulating needle valve is located between the bearing box and the main steam valve. The ambient temperature is too high and the needle valve cannot be adjusted, which leads to the delay of the test; 2. The throttle valve stem has no stroke limit, and an experienced operator must be used for each speed adjustment, otherwise it is easy to adjust the throttle valve stem due to too many turns. The separation from the main body caused the high-pressure oil output by the speedometer to spray out. During the test, there was a case where the high-pressure oil output from the speedometer was sprayed out due to the excessive number of turns of the throttle valve rod being adjusted and separated from the main body, resulting in personal injury, and the test was terminated; 3 .The throttle valve rod is sealed with a flexible graphite composite braided rope, and there is oil leakage. The flexible graphite composite braided rope will become brittle and become powder after long-term use, which is easy to contaminate the lubricating oil, resulting in insufficient precision of the lubricating oil, which poses a safety hazard to the unit.

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