Butterfly slow closure check valve

一种蝶式缓闭止回阀

Abstract

本发明提供一种蝶式缓闭止回阀,包括阀体、两个半圆形阀板、阀轴、两个扭簧和两个缓闭装置,缓闭装置分别设于阀板的圆弧中点处,缓闭装置主体伸入阀体的部分内部设有空腔,空腔中部设有一个与空腔内壁贴合滑动的弹簧座,空腔底部与弹簧座之间设有弹簧,弹簧一端固定于空腔底部,另一端固定于弹簧座内侧;弹簧座外侧设有伸缩杆,伸缩杆截面呈工字形;空腔顶部设有封盖,封盖中间设有通孔,伸缩杆穿过通孔,通孔上设有波纹橡胶垫;伸缩杆底部与弹簧座贴合,中部套有与波纹橡胶垫相匹配的波纹密封圈,顶部位于封盖外部并顶住阀板。本发明结构简单,节省成本且安全性能好,不易损坏。
The invention provides a butterfly slow closure check valve. The butterfly slow closure check valve comprises a valve body, two semi-circular valve plates, a valve shaft, two torsional springs and two slow closure devices. The slow closure devices are disposed in the centers of circular arcs of the valve plates respectively; cavities are formed in the parts, extending into the valve body, of main bodies of the slow closure devices; spring seats which are attached to the inner walls of the cavities to slide are disposed in the middles of the cavities respectively; springs are arranged between the cavity bottoms and the spring seats; one end of each spring is fixed to the bottom of the corresponding cavity, and the other end of each spring is fixed to the inner side of the corresponding spring seat; retractable rods are disposed on the outer sides of the spring seats, and the section of each retractable rod is in an I shape; seal covers are disposed at the tops of the cavities; through holes are formed in the middles of the seal covers; the retractable rods penetrate through the through holes; the through holes are provided with corrugated rubber pads; the bottoms of the retractable rods are attached to the spring seats, the middles of the retractable rods are sleeved with corrugated seal rings which are matched with the corrugated rubber pads, and the tops of the retractable rods are located outside the seal covers and tightly push the valve plates. The butterfly slow closure check valve is simple in structure, capable of reducing cost, good in safety performance and not prone to being damaged.

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