초록 ▼

A valve body includes a chamber for the flow of fluid between an inlet and an outlet thereto. The chamber includes an upper portion with an opening therethrough and a lower portion including a valve seat between the inlet and outlet. A bonnet is positioned in the chamber upper portion and is connect

A valve body includes a chamber for the flow of fluid between an inlet and an outlet thereto. The chamber includes an upper portion with an opening therethrough and a lower portion including a valve seat between the inlet and outlet. A bonnet is positioned in the chamber upper portion and is connected to the valve body and extends upwardly therefrom. The bonnet includes a passageway, and a stem is positioned in the passageway for longitudinal movement into and out of sealing relation with the valve seat. An air operator is connected to the upper end of the stem and is connected to a source of fluid under pressure, such as compressed air, which is supplied by remote control to the air operator to control reciprocation of the stem to open and close the valve. The air operator includes a base connected to the bonnet in surrounding relation with the stem and positioned in spaced relation with a piston connected to the upper end of the stem to thereby form a fluid chamber. A housing encloses the piston and the base. Pressurized air is admitted and released to and from the chamber for reciprocating the piston to open and close the valve. A compression spring acts on the stem to normally maintain the valve closed. Supplying compressed air to the chamber exerts an upward force on the piston to raise the stem and compress the spring to open the valve. Sliding seal means is provided on the piston for maintaining a seal between the piston and housing as the piston is reciprocated. The housing is rotatably supported on the base to permit selective positioning of the passageway to accommodate connection of the air operator to a source of compressed air.

대표청구항 ▼

A valve comprising, a valve body having a valve chamber therein, said valve chamber including an upper portion with an opening therethrough and a lower portion having a valve seat, inlet and outlet openings extending through said valve body and communicating with said valve seat, a bonnet positioned

A valve comprising, a valve body having a valve chamber therein, said valve chamber including an upper portion with an opening therethrough and a lower portion having a valve seat, inlet and outlet openings extending through said valve body and communicating with said valve seat, a bonnet positioned in said chamber upper portion and connected to said valve body, said bonnet having a passageway therethrough aligned with said chamber, a stem positioned for longitudinal movement in said bonnet passageway and including a lower end portion extending into said chamber lower portion and being adapted to sealingly engage said valve seat to thereby open and close the valve, said stem including an upper end portion extending above said bonnet, a piston connected to said stem upper end portion, said piston including an outer cylindrical surface and an end portion, a base connected to said bonnet in surrounding relation to said stem, said base having an end portion positioned in spaced relation with said piston end portion, a cylindrical housing enclosing said piston and said base, said housing having an internal wall, said housing internal wall and said spaced apart piston end portion and said base end portion forming a fluid chamber between said piston and said base, said piston outer cylindrical surface being longitudinally slidable on said housing internal wall, a passageway extending through said housing internal wall and communicating with said fluid chamber for admitting and releasing pressurized fluid to and from said fluid chamber for reciprocating said piston to open and close the valve, first seal means positioned between said base and said housing internal wall for maintaining a fluid-tight seal between said housing and said base, second seal means positioned between said piston and said housing internal wall for maintaining a fluid-tight seal therebetween as said piston reciprocates in said fluid chamber, said second seal means including an annular seal member having an inner edge and an outer edge, said piston outer cylindrical surface having a recess, said annular seal member inner edge positioned in said recess and said annular seal member outer edge positioned for slidable movement on said housing internal wall upon reciprocation of said piston, said annular seal member being movable with said piston with said annular seal member inner edge being maintained in sliding sealing engagement with said housing internal wall to prevent escape of fluid upwardly through said housing between said piston and said housing internal wall, a compression coil spring positioned on said stem and abutting said base at one end and acting on said stem at the other end, and said coil spring exerting a force on said stem to normally maintain said stem lower end portion engaging said valve seat in the absence of fluid in said fluid chamber to exert an upward force on said piston to raise said stem and open the valve.