Valve opening and closing indicating device and valve

Abstract

The invention provides a valve opening and closing indicating device. The valve opening and closing indicating device comprises a fixed base, a cover, a driving gear, a driving connecting rod, a transmission gear assembly, an indicating gear and an indicating component, wherein the cover covers the fixed base; the driving gear rotatably penetrates in the fixed base through a rotating shaft; the rotating shaft movably penetrates through the fixed base and extends downwards; the driving connecting rod extends in the up-down direction; a connecting part which is coaxially and fixedly connected with a valve rod or a valve rod adapter is arranged at the lower end of the driving connecting rod; the upper end of the driving connecting rod is matched with the rotating shaft to drive the driving gear to rotate; the transmission gear assembly is arranged on the fixed base and is engaged with the driving gear; the indicating gear is rotatably arranged on the cover and is engaged with the transmission gear assembly; and the indicating component is fixed on the indicating gear and rotates along with the indicating gear. The valve opening and closing indicating device is skillful in structural design and convenient to mount, is suitable for being mounted in a valve of which a valve rod is not exposed, and is high in universality. Operators can conveniently and timely observe and know the opening situation of the valve with the valve opening and closing indicating device.

Description

technical field [0001] The invention relates to a valve switch indicating device and a valve, in particular to a valve switch indicating device and a valve for a dark stem gate valve. Background technique [0002] In the hidden stem gate valve, the valve stem only rotates around its own axis, and the gate plate is driven up and down by the action of the thread of the valve stem and the valve stem nut to open and close the valve. Since the valve stem does not rise and fall with the gate plate, it is difficult to detect the opening of the valve when operating the valve. Therefore, in order to facilitate observation and operation, a valve switch indicating device needs to be installed on the dark rod gate valve. [0003] In the prior art, the switch indicating device of the dark stem gate valve is usually directly sleeved on the valve stem, and the rotation of the valve stem drives the gear assembly and the indicating part to display the valve opening. For example, the hidden...

AI Technical Summary

Problems solved by technology

However, there are some problems in the installation and use of the existing opening indicators, for example: (1) At least part of the valve stem is required to be exposed outside the valve body during installation, otherwise it cannot be installed; The diameter of the installation hole of the valve stem matches the diameter of the valve stem. When the diameter of the valve stem has multiple specifications, the opening indicator cannot be used universally.

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