US4353388A — Butterfly valve

Claim 1

Independent Claim 303 words

A butterfly valve comprising: a valve housing (2) having first and second tubular portions (3,3); a valve stem (1) extending in said tubular portions (3,3) and carrying a valve closure member (6) rotatable in said valve housing (2); first and second gland packing portions (9,9) provided between said stem (1) and said first and second tubular portions (3,3) to prevent fluid leakage; first and second bearing portions (4,4) for said valve stem (1) provided outwardly of said gland packing portions (9,9) respectively, wherein each of said first and second gland packing portions (9,9) is divided axially of said valve stem (1) into two sections (9a,9b), and including a bearing member (10) is fitted between said valve stem (1) and said tubular portion (3) at a position intermediate between said two sections (9a,9b); and an inlet duct (R1) penetrating each of said tubular portions (3,3) and a passage (R) provided between said valve stem (1) and each of said first and second tubular portions (3,3) to introduce purge fluid into said valve housing (2), said passage (R) being defined at least at a position adjacent to an inwardly opening end (28) of each of said tubular portions (3,3) by a collar (19) surrounding said valve stem (1) and a bush (20) fitted against an interior wall of said tubular portion (3); said inlet duct (R1) including at least one perforation (21) defined in at least one of said tubular portions (3,3), and a purge ring (18) fitted in each of said tubular portions (3,3), said purge ring (18) having a peripheral groove (16) and a plurality of pores (17) defined circumferentially thereof to communicate with said peripheral groove (16) and said passage (R), said perforation (21) and said peripheral groove (16) being in communication and said pores (17) being staggered with said perforation (21).

Claim 2

Dependent Claim 303 words

A butterfly valve comprising: a valve housing (2) having first and second tubular portions (3,3); a valve stem (1) extending in said tubular portions (3,3) and carrying a valve closure member (6) rotatable in said valve housing (2); first and second gland packing portions (9,9) provided between said stem (1) and said first and second tubular portions (3,3) to prevent fluid leakage; first and second bearing portions (4,4) for said valve stem (1) provided outwardly of said gland packing portions (9,9) respectively, wherein each of said first and second gland packing portions (9,9) is divided axially of said valve stem (1) into two sections (9a,9b), and including a bearing member (10) is fitted between said valve stem (1) and said tubular portion (3) at a position intermediate between said two sections (9a,9b); and an inlet duct (R1) penetrating each of said tubular portions (3,3) and a passage (R) provided between said valve stem (1) and each of said first and second tubular portions (3,3) to introduce purge fluid into said valve housing (2), said passage (R) being defined at least at a position adjacent to an inwardly opening end (28) of each of said tubular portions (3,3) by a collar (19) surrounding said valve stem (1) and a bush (20) fitted against an interior wall of said tubular portion (3); said inlet duct (R1) including at least one perforation (21) defined in at least one of said tubular portions (3,3), and a purge ring (18) fitted in each of said tubular portions (3,3), said purge ring (18) having a peripheral groove (16) and a plurality of pores (17) defined circumferentially thereof to communicate with said peripheral groove (16) and said passage (R), said perforation (21) and said peripheral groove (16) being in communication and said pores (17) being staggered with said perforation (21).

Claim 3

Dependent Claim 83 words

A butterfly valve as claimed in claim 1 wherein each of said tubular portions (3,3) has a perforation (3a) and each of said bearing members (10) has inner and outer peripheral grooves (12,13) and at least one pore (14) communicating with said inner and outer grooves (12,13), said perforation (3a), said inner and outer grooves (12,13) and said pore (14) forming a duct (R2) for introducing grease to said bearing member (10) in contact with said stem (1) and said tubular portion (3).

Claim 4

Dependent Claim 50 words

A butterfly valve as claimed in claim 2 wherein said collar (19) surrounds said valve stem (1) with a space (L) therebetween and has one end thereof resting in a recess (24) defined on said valve closure member (6) and the other end thereof extending into said tubular portion (3).

Claim 5

Dependent Claim 29 words

A butterfly valve as claimed in claim 3 wherein said collar (19) is provided on a side defining said passage (R) with heat and wear resisting metal coating (27).

Claim 6

Dependent Claim 24 words

A butterfly valve as claimed in claim 4 wherein said bearing portions (4,4) comprise ball bearings and said bearing members (10,10) comprise metal bearings.

Claim 7

Dependent Claim 27 words

A butterfly valve as claimed in claim 5 wherein said bearing members (10,10) and said valve stem (1) have beads (11) at positions to contact each other.

Claim 8

Dependent Claim 33 words

A butterfly valve as claimed in claim 1 wherein said inlet duct (R1) for purge fluid includes a plurality of perforations (121) defined in said at least one of said tubular portions (3,3).

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1985-10-11	1986-04-12	1986-10-12	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1989-10-11	1990-04-12	1990-10-12	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1993-10-11	1994-04-12	1994-10-12	$7700.00	Window Closed / Lapsed

Butterfly valve

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