Stem seal automatic monitoring compensation and emergency device

Abstract

The invention discloses an automatic monitoring compensation and emergency device for valve rod seal, and relates to the field of valve rod seal. The automatic monitoring compensation and emergency device for valve rod seal sequentially comprises a valve body upper end, a soft filler, a metal ring and a valve rod from bottom to top, wherein a threaded filler compression piece is arranged at the upper end of the metal ring; the valve rod penetrates through the soft filler, the metal ring and the threaded filler compression piece; a mould pressing filler and a sealed O-shaped ring slot are arranged at the top end of the valve body upper end; a medium leakage monitoring ring is arranged at the upper ends of the mould pressing filler and the sealed O-shaped ring; a medium leakage monitoring sensor is arranged on a monitoring port of the medium leakage monitoring ring; the medium leakage monitoring ring is connected with a programmable logic controller; a drive wheel, a rolling steel ball and a driven ratchet wheel are arranged at the upper end of the medium leakage monitoring ring; the drive wheel is connected with a micro hydraulic cylinder; the driven ratchet wheel and the threaded filler compression piece are in clearance fit; and the micro hydraulic cylinder is connected with a micro hydraulic pump and the programmable logic controller. The automatic monitoring compensation andemergency device for valve rod seal can realize the real-time monitoring on the valve rod seal leakage, and has the functions on automatically compensating a soft filler and emergently sealing in case of complete failure.

Description

Technical field [0001] The invention relates to the field of valve stem sealing, in particular to a valve stem sealing automatic monitoring compensation and emergency device. Background technique [0002] The stem seal is used to reduce or eliminate the leakage of medium from the valve. For sub-atmospheric applications, the stem seal must reduce or eliminate air infiltration into the valve. Although the sealing device is only a few parts, it can determine the safety, reliability and durability of the overall device. When transmitting corrosive, flammable, explosive or toxic media, leakage can easily cause major safety accidents, endanger personal safety, and bring huge economic losses. [0003] At this stage, the main forms of valve stem sealing are single seal and double seal. The sealing methods mainly include O-ring sealing and soft packing sealing. O-ring seal is the simplest way for the valve stem to advance and rotate. It does not have the ability to adjust. It is an idea...

AI Technical Summary

Problems solved by technology

Compensation by springs is relatively weak, spring loads are controlled by manufacturing tolerances and are not adjustable during assembly

The spring is easily affected by the external environment and process medium. As the spring tension changes, the compensation effect will gradually fail. This compensation process is non-active and nonlinear.

Images