Method of opening fluid control valve and fluid control valve used for the same

3:

• The method of opening the fluid control valve according to claim 1, wherein
• the valve body includes a valve body portion configured for moving back and forth relative to the fluid pipe, a seal portion provided at an outer surface of the valve body portion, and a movement portion configured for moving relative to the valve body portion, the seal portion being expanded when the movement portion moves relative to the valve body portion taking a valve close position, wherein
• the valve opening step includes a first step of moving the movement portion in a valve opening direction and a second step of moving the valve body portion in the valve opening direction together with the movement portion, and
• the pressure adjustment step is started taking the first step as a trigger.

4:

• A fluid control valve for controlling fluid, comprising:
• a housing externally fitted onto a fluid pipe in a hermetic state;
• and
• a valve body having a valve body portion configured for moving back and forth relative to the fluid pipe and a seal portion provided at an outer surface of the valve body portion,
• wherein the seal portion is configured for hermetically contacting an inner peripheral surface of a hole of the fluid pipe formed in the housing and an inner peripheral surface of the fluid pipe to block or open a flow of fluid in the fluid pipe,
• the valve body portion is in a hollow shape, and is provided with a first communication hole communicating with the fluid pipe on a first side of the valve body and a second communication hole communicating with the fluid pipe on a second side of the valve body, the first side and the second side of the valve body being arranged so as to sandwich the valve body in an axial direction of the fluid pipe, and
• the valve body has a switching mechanism configured for switching a communication state and a non-communication state between the first communication hole and the second communication hole.

8:

• The method of opening the fluid control valve according to claim 2, wherein
• the valve body includes a valve body portion configured for moving back and forth relative to the fluid pipe, a seal portion provided at an outer surface of the valve body portion, and a movement portion configured for moving relative to the valve body portion, the seal portion being expanded when the movement portion moves relative to the valve body portion taking a valve close position, wherein
• the valve opening step includes a first step of moving the movement portion in a valve opening direction and a second step of moving the valve body portion in the valve opening direction together with the movement portion, and
• the pressure adjustment step is started taking the first step as a trigger.