Control valve, in particular angle control valve and double control valve, also in the form of a straight-seat valve and inc.lined-seat valve for extreme control applications

Abstract

The invention relates to a control valve 1), in particular an angle control valve and double control valve, for extreme control applications, preferably for discharge or reduction for hot separators and vacuum distillation columns. The valve piston 12 and the valve head 13 are designed as one piece and consist of tungsten carbide. Furthermore, the control valve comprises different constructions across the entire control valve range. For example, the valve housing 100, the valve seat 6 and a packing retainer 14 are optionally shaped such that the inner hollow space tapers continuously from the valve inlet to the valve seat 6, which prevents evaporation upstream of the valve seat 6. Furthermore, the double control valve consists of a large sub-valve 36 and at least one small sub-valve 37, wherein the large sub-valve 36 is designed as an adjustable open-closed piston valve and the small sub-valve 37 is designed as a control valve.

Description

technical field [0001] The invention relates to control valves, in particular angle control valves and double control valves (i.e. a single seat valve and a Y control valve), in the case of abrasive and corrosive media at temperatures exceeding 500 °C and pressure drops exceeding 100 bar It is more suitable for the discharge and pressure regulation of high-pressure and medium-pressure thermal decomposers and vacuum distillation towers, especially for hydrogenation and coal liquefaction. The inlet and outlet channels of the valve body are lined with tungsten carbide. The valve seat is between the inlet and outlet channels, and the front end of the valve plug has a valve head with control characteristics. The valve seat and valve head are made of integral tungsten carbide structure. Background technique [0002] In a typical hydrogenation "or upgrading" unit, heavy hydrocarbons are contacted with hydrogen sufficiently to produce light hydrocarbons suitable for transportation m...

AI Technical Summary

Problems solved by technology

Therefore, it is very difficult to disassemble the control valve to replace the parts stuck together

[0009] Furthermore, other tungsten carbide components such as the valve head are closely coupled with steel components such as the valve plug, which is very complicated due to the above reasons

Tungsten carbide is very expensive and has long lead times

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