Fluid apparatus

1. A fluid apparatus that is installed in a piping through which a fluid used in a semiconductor manufacturing apparatus is allowed to flow, the fluid apparatus comprising:

a body portion in which a fluid flow passage is formed, the fluid flow passage extending along an axis, and having a valve hole at one end of the fluid flow passage; and

a valve element portion accommodated in the body portion in an advancing and retracting manner along the axis,

wherein at least a portion of the valve element portion is made of a conductive fluororesin material containing a fluororesin material and carbon nanotubes dispersed in the fluororesin material, and is conductive with a grounding portion maintained at a ground potential,

wherein a volume resistivity of the conductive fluororesin material falls within a range of larger than 1.0×10 3 Ω·cm and less than 1.0×10 4 Ω·cm,

wherein the valve element portion has a tubular shape conforming to an inner peripheral surface of the body portion, the valve element portion comprising:

a distal end portion, inserted into the valve hole, made of a non-conductive fluororesin material containing no carbon nanotubes; and

a proximal end portion made of the conductive fluororesin material, the proximal end having:

an inner space in communication with an other end of the fluid flow passage; and

a flow hole allowing a fluid to flow between the inner space and the valve hole,

wherein the body portion includes:

a first body portion configured to support an outer peripheral surface of the valve element portion on a distal end side; and

a second body portion configured to support an outer peripheral surface of the valve element portion on a proximal end side, the second body portion being disposed on an inner peripheral side of the first body portion,

wherein the first body portion is made of a non-conductive fluororesin material containing no carbon nanotubes, and

wherein the second body portion is made of the conductive fluororesin material, and is in contact with both a portion of the valve element portion, which is made of the conductive fluororesin material, and the grounding portion.

2. The fluid apparatus according to claim 1 , wherein the conductive fluororesin material contains carbon nanotubes at a ratio of 0.020 weight % or more and 0.030 weight % or less.

3. The fluid apparatus according to claim 2 , further comprising:

a biasing force generating portion configured to generate a biasing force in a direction that the valve element portion is inserted into the valve hole.

4. The fluid apparatus according to claim 1 , further comprising:

a biasing force generating portion configured to generate a biasing force in a direction that the valve element portion is inserted into the valve hole.

5. The fluid apparatus according to claim 1 , wherein the grounding portion is a metal member mounted on an end portion of the proximal end side of the body portion in a state of being in contact with the second body portion and is maintained at a ground potential.

6. The fluid apparatus according to claim 1 , wherein the distal end portion of the valve element portion is integrally formed with the proximal end portion of the valve element portion, the distal end portion being made of a non-conductive fluororesin material containing no carbon nanotubes and the proximal end portion being made of the conductive fluororesin material.