Draining device for high-pressure heater regulating valve

Abstract

The invention relates to a draining device for a high-pressure heater regulating valve. The draining device comprises a plurality layers of valve cages which are combined by a layer-to layer sleeve manner; a plurality of through-flow holes are formed in each layer of valve cages; the through-flow holes in every two adjacent layers of valve cages under the same cross section are arranged in a half-hole staggering manner. Compared with the prior art, the draining device has the advantages that the structure is simple, the flow characteristic of the original valve can be remained, a valve element greatly avoids scouring, the draining performance is outstanding, blocking is difficultly caused, the flowing capacity is high, the dismounting and maintaining are convenient, and the maintenance period is short; and the cleaning frequency is effectively reduced, so that the use cost is decreased, and the safety and the reliability are ensured.

Description

technical field [0001] The invention relates to a draining device for a regulating valve, in particular to a draining device for a regulating valve of a high-pressure heater. Background technique [0002] High pressure heaters play a very important role in the production and operation of power plants. The high-pressure heater is a device located between the feedwater pump and the economizer or evaporator in the feedwater recuperation system of the power plant, which uses steam turbine extraction to heat the high-pressure feedwater. However, during the long-term operation of the high-pressure heater, the flow of the regulating valve is often poor or even blocked. After inspection, it was found that the cage of the original regulating valve was a double-layer structure, that is, it was composed of an inner cage and an outer cage. The connection is realized through the gap between the double-layer structure. This means that when the valve cage is draining water, the water fl...

AI Technical Summary

Problems solved by technology

This means that when the cage is draining water, the water flow through the through hole of the outer cage needs to go through the gap between the double-layer structure to reach the through hole of the inner cage; and due to the gap between the double-layer structure Smaller, it is easy to accumulate impurities, which will cause the problem of unsmooth drainage and even blockage

When blockage occurs, it is necessary to suspend the operation of the high-pressure heater and disassemble the cage of the control valve for cleaning, which has a great impact on the economy and safety of the unit, and the high frequency of cleaning will also affect the control valve cause damage

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