Gate valve in which amount of squeeze of sealing material is controllable

Abstract

{Technical Problem} To provide a gate valve that can control the amount of squeeze of sealing material according to each of situations, that is, under the in-manufacturing or during vacuum-maintaining state; thereby, the invented gate valve is capable of suppressing deterioration of its sealing material and lengthening the service life of the sealing material used therein. {Solution to Problem} The gate valveof the embodiment has the control device, which is comprised of the equipment control unitthat transmits an instruction either an in-manufacturing CLOSE instruction or a FULL CLOSE instruction and the storage meansthat stores position date that corresponds to each of such instructions. The control devicereceives either of such instructions and generates the position signal referring to the corresponding position data. The servo motorof the driving devicereceives the position signal and the rotative force of the servo motor, which corresponds to the received position signal, is translated into the movement of the activator. The sealing materialon the gateis pressed against the valve seatby the gatedriven according to each of the instructions and is maintained in the squeezed state.