Regulating valve with double valve seats

Abstract

The invention relates to a regulating valve with double valve seats. The regulating valve comprises a bottom cover, a valve core, a valve body, a sealing packing material, a packing material washer, a packing gland, an upper guide sleeve, a valve rod, a positioning pin, an upper valve seat, a lower valve seat and a connecting piece, wherein the valve body is a large valve cavity structure valve body with an upper valve seat insulating wall and a lower valve seat insulating wall; a double valve core structure of integrated same flow characteristic curve is adopted for the valve core; a double guide structure of two orientations at the upper guide sleeve and a valve body bottom part blank cap is adopted; balance holes are manufactured on the blank cap and the upper guide sleeve; and copper sleeves manufactured by adopting tin bronze is adopted for the embedding of the guide holes on the upper guide sleeve and the blank cap. The invention has the beneficial effects of less loss of pressure drop, large flow, wide adjustable extent, good action stability, and the regulating valve is especially suitable for the use of a pipeline system that the caliber is greater than DN 200, the front and rear pressure difference of the valve is great, the required rated flow is great, the leakage level requirement is low, and mediums have fine impurity working conditions.

Description

technical field [0001] The invention relates to a regulating control valve, in particular to a double valve seat regulating valve. Background technique [0002] Single-seat regulating valve and sleeve regulating valve are the two most widely used regulating valves in various industrial fluid control systems today. Although the single-seat control valve has the advantages of small pressure drop loss and small leakage, it is not suitable for use in the conditions of large pressure difference between the front and rear of the valve or medium containing small impurities due to the top-guided structure and unbalanced force. Although the sleeve regulating valve has the advantages of large allowable pressure difference and good stability, when the valve caliber is large, the structural size of the sleeve valve core is correspondingly large, and it is easy to deform, so it must be manufactured to achieve high matching accuracy. , the processing difficulty is relatively large. Con...

AI Technical Summary

Problems solved by technology

Although the single-seat control valve has the advantages of small pressure drop loss and small leakage, it is not suitable for use in the conditions of large pressure difference between the front and rear of the valve or medium containing small impurities due to the top-guided structure and the unbalanced force.

Although the sleeve regulating valve has the advantages of large allowable pressure difference and good stability, when the valve caliber is large, the structural size of the sleeve valve core is correspondingly large, and it is easy to deform, so it must be manufactured to achieve high matching accuracy. , it is more difficult to process

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