Sealed tube valve necking

The present invention relates to a valve, particularly to a sealed tube necking valve. Specific technical scheme: necking a blocked pipe valve, comprising a valve body drive member, the valve body and the drive spool, the valve body comprises a medium inlet channel and the connecting chamber, the connection chamber is provided with a trumpet-shaped beam sets, the beam includes a large end and a small end of the sleeve, between the big end and small end through the connection port is turned on, the beam is in the large end of the valve body sleeve medium at the inlet channel, is connected to the small end of the chamber, the valve body comprising reciprocally sliding tubular body having an axial flow passage in the valve connecting chamber, the valve body comprising a sealing end and a drive end, the sealing end is provided with a sealing seat, an actuating drive member comprises a tube, the tube is defined on the operating and the valve body upstream of the flow path channel is turned, with the circumferential axial guide means between the spool and valve body to limit, the connection member detachably provided on the outer tube operation. With the above aspect, there is provided an environmentally friendly, online troubleshooting, operation member without external control valve necking sealed tube.