US 6,386,511 B1 · Gate valve apparatus

Abstract

To be able to reduce the size of a drive part and, as a result, to achieve the reduction in size and the lowering of manufacturing cots of a gate valve. An open/close mechanism is configured from a turning pair only. This open/close mechanism is configured from a first swing link, second swing link and coupling link. The first swing link is driven by a rotation cylinder to perform a swinging motion. The second swing link is connected to a drive shaft and performs a swinging motion with the drive shaft as its axis. The first swing link and second swing link are coupled by the coupling link. When the rotation cylinder is driven, whereby the first swing link is caused to swing, the coupling link is vertically driven whereby the second swing link is caused to swing. As a result, a valve, connected to the second swing link, swings and the opening and closing operation of the flow path port is performed.

Claims8

Dependent claims

A gate valve apparatus which comprises:

a valve box with a flow path port;
a valve housed in the inner side of the said valve box which is employed in the opening and closing of said flow path port;
a valve rod connected to said valve;
and
an open/close mechanism having a link mechanism which includes only a turning pair;
said link mechanism being connected to said valve rod for performing rotation thereof around its center axis to cause said valve to to swing in from the front of the valve seat to a closing position where said valve is seated on the valve seat of said valve box and to swing out from the front of the valve seat to an opening position where said valve is separated from said valve seat.

3 more elements

Dependencies are inferred from the claim text.

Gate valve apparatus

Life of this patent

Gate valve apparatus

Life of this patent

Abstract

Claims8