Valve seat machining device, and valve seat machining method using said valve seat machining device

1. A valve seat processing machine configured to process a valve seat in a valve device including a valve body portion which forms a flow passage of fluid and a valve drive portion which is detachably provided on the valve body portion and which opens and closes the flow passage by driving a valve element capable of tightly engaging with the valve seat in the valve body portion, the valve seat processing machine comprising:

a base portion configured to be attached to the valve body portion;

a main body portion provided on the base portion and movable relative to the base portion in two different axial directions;

a support portion provided on the main body portion and movable relative to the main body portion in a drive direction of the valve element when attached to the valve body;

a main spindle provided on the support portion and rotatable relative to the support portion; and

a tool holder provided on the main spindle and configured to hold a tool for processing the valve seat, wherein:

the main body portion includes pressing means for pressing the base portion to form a gap between the main body portion and the base portion from a state where the main body portion and the base portion are in contact,

the base portion includes a plurality of bolt insertion holes that are capable of being aligned with a plurality of existing bolt holes provided in the valve body portion, the bolt insertion holes being arranged at an equal pitch on a common circumference,

the base portion is capable of being attached to the valve body portion in various attachment positions within a plane orthogonal to the drive direction of the valve element, and

a position of the main spindle is capable of being adjusted, relative to the base portion, to be rotatable about an axis parallel to the drive direction of the valve element by causing the pressing means to tilt the main body portion relative to the base portion.

2. The valve seat processing machine according to claim 1 , wherein the valve seat processing machine further comprises a ring member rotatably attached to an outer periphery of the main spindle and fixable to the valve body portion.

3. A valve seat processing method of processing a valve seat in a valve device including a valve body portion which forms a flow passage of fluid and a valve drive portion which is detachably provided on the valve body portion and which opens and closes the flow passage by driving a valve element capable of tightly engaging with the valve seat in the valve body portion, characterized in that the valve seat processing method comprises

processing the valve seat into a shape corresponding to the valve element by removing the valve drive portion from the valve body portion, attaching the valve seat processing machine according to claim 1 to the valve body portion, and attaching a plurality of cutting tools with different cutting blade shapes to the tool holder in turns.

4. The valve seat processing machine according to claim 1 , wherein the pressing means is capable of pressing the base portion independently at a plurality of positions.

5. A valve seat processing machine configured to process a valve seat in a valve device including a valve body portion that forms a fluid flow passage and a valve drive portion that is detachably provided on the valve body portion and which opens and closes the flow passage by reciprocally driving a valve element relative to the valve seat in the valve body portion, the valve seat processing machine comprising:

a base portion configured to be attached to the valve body portion;

a main body portion provided on the base portion, the main body portion being movable relative to the base portion in two different axial directions;

a support portion provided on the main body portion, the support portion being movable relative to the main body portion;

a main spindle provided on the support portion, the main spindle being rotatable about a spindle axis; and

a tool holder provided on the main spindle, the tool holder being configured to hold a tool for processing the valve seat, wherein:

the main body portion includes a plurality of flanges including a plurality of screw holes penetrating the flanges and lifting bolts received in the screw holes formed in the flanges, respectively,

the lifting bolts are capable of being screwed into the screw holes until the lifting bolts engage the base portion and a gap is formed between the main body portion and the base portion from a state where the main body portion and the base portion are in contact,

the base portion includes a plurality of bolt insertion holes capable of being aligned with a plurality of bolt holes provided in the valve body portion, the bolt insertion holes being arranged at an equal pitch on a common circumference,

the base portion is capable of being attached to the valve body portion in various attachment positions within a plane orthogonal to the axial direction of the main spindle, and

the main spindle is adjustable, relative to the base portion, by selectively screwing the lifting bolts in the screw holes formed in the flanges to tilt the main body portion relative to the base portion.

6. The valve seat processing machine according to claim 5 , further comprising a ring member rotatably attached to an outer periphery of the main spindle and fixable to the valve body portion.

7. The valve seat processing machine according to claim 5 , each of the lifting bolts is capable of being independently screwed into the screw holes formed in the flanges to engage the base portion independently at a plurality of positions.