초록 ▼

A method of assembling a butterfly valve that includes a shaft rotatably supported by first and second bearing portions. A first adjusting instrument is used to adjust thrust and radial clearances between the first end of the shaft and the first bearing portion. A second adjusting instrument is used

A method of assembling a butterfly valve that includes a shaft rotatably supported by first and second bearing portions. A first adjusting instrument is used to adjust thrust and radial clearances between the first end of the shaft and the first bearing portion. A second adjusting instrument is used for adjusting thrust and radial clearances between the second end of the shaft and the second bearing portion, and the shaft is arranged at a center of the fluid flow passage.

대표청구항 ▼

1. A method for assembling a butterfly valve in a fluid flow passage in a valve system, said valve system including:a shaft to which said butterfly valve is attached, said shaft being a rotation center of said butterfly valve;a first bearing portion rotatably supporting a first end of said shaft; an

1. A method for assembling a butterfly valve in a fluid flow passage in a valve system, said valve system including:a shaft to which said butterfly valve is attached, said shaft being a rotation center of said butterfly valve;a first bearing portion rotatably supporting a first end of said shaft; anda second bearing portion rotatably supporting a second end of said shaft;the method for assembling said butterfly valve comprising steps of:using a first adjusting instrument for adjusting thrust and radial clearances between the first end of said shaft and said first bearing portion;using a second adjusting instrument for adjusting thrust and radial clearances between the second end of said shaft and said second bearing portion; and arranging said shaft at a center of said fluid flow passage. 2. A method for assembling a butterfly valve according to claim 1, whereinsaid first bearing portion includes a first bearing holder supporting a first bearing,said second bearing portion includes a second bearing holder supporting a second bearing,said method for assembling said butterfly valve further comprising steps of:fitting a ring-like projection of said first adjusting instrument to said first bearing, said first bearing holder, and the first end of said shaft, and fitting a ring-like projection of said second adjusting instrument to said second bearing holder and the second end of said shaft. 3. A method for assembling a butterfly valve according to further comprising steps of:temporarily fastening said butterfly valve to said shaft;putting a clearance adjusting instrument between said butterfly valve and an inner wall of said fluid flow passage for arranging said butterfly valve in such a manner that a clearance between said butterfly valve and the inner wall of said fluid flow passage is constant along an entire outer periphery of said butterfly valve; andfirmly fixing said butterfly valve to said shaft. 4. A method for assembling a butterfly valve according to claim 2, wherein said second adjusting instrument includes a protrusion and the second end of said shaft has a groove,said method for assembling said butterfly valve further comprising:fitting said protrusion of said second adjusting instrument to said groove of the second end of said shaft.