Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Reexamination Certificate
2001-07-06
2003-09-02
Look, Edward K. (Department: 3754)
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
C137S270000
Reexamination Certificate
active
06612538
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a two-way valve having a first port and a second port for introducing and discharging pressurized fluid in two directions.
2. Description of the Related Art
Two-way valves have conventionally been used, e.g., in a fluid circuit. The two-way valve has a first port and a second port for introducing and discharging pressurized fluid, and has a valve body for opening and closing a communication passage between first and second ports. The valve body is operated by a pilot pressure supplied through a pilot port.
In the conventional two-way valves, however, the pilot port is fixed in a predetermined position of the valve body. If an installation space is small, it is difficult to connect a tube to the pilot port in piping operations and also difficult to freely change the direction of a tube since the direction of the tube is limited. Accordingly, the usability is not satisfactory.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a two-way valve wherein a position of a pilot port can be freely changed based on an installation environment. The two-way valve makes piping operations easy and allows pipes or tubes to be freely arranged for convenience.
REFERENCES:
patent: 4526341 (1985-07-01), Thomas
patent: 4687017 (1987-08-01), Danko et al.
patent: 4712576 (1987-12-01), Ariizumi et al.
patent: 4828219 (1989-05-01), Ohmi et al.
patent: 4840347 (1989-06-01), Ariizumi
patent: 4995589 (1991-02-01), Adishian et al.
patent: 5253671 (1993-10-01), Kolenc
patent: 5889275 (1999-03-01), Chen
patent: 5996636 (1999-12-01), Fukano et al.
patent: 38 08 478 (1989-09-01), None
patent: 0 844 401 (1998-05-01), None
patent: 61-79084 (1986-04-01), None
patent: 62-82477 (1987-05-01), None
patent: 63-88387 (1988-04-01), None
Co-pending U.S. patent application Ser. No. 09/899,196, filed Jul. 6, 2001, by Yoshihiro Fukano et al.
Co-pending U.S. patent application Ser. No. 09/899,202, filed Jul. 6, 2001, by Yoshihiro Fukano et al.
Note: U.S. Patent No. 4,840,347 corresponds in subject mater to DE 38 08 478 A1, and serves as a translation thereof.
Note: English language abstracts of the above Japanese citations are provided to serve as partial translations thereof.
Fukano Yoshihiro
Uchino Tadashi
Fristoe, Jr. John K
Guss Paul A.
Look Edward K.
SMC Kabushiki Kaisha
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