초록 ▼

A safety valve having an upright tubular body with an axial opening therethrough, a portion of the opening at the lower end forming a flow passageway, the body having outlet ports extending from the flow passageway to the external cylindrical surface, an end cap closing the upper end of the axial op

A safety valve having an upright tubular body with an axial opening therethrough, a portion of the opening at the lower end forming a flow passageway, the body having outlet ports extending from the flow passageway to the external cylindrical surface, an end cap closing the upper end of the axial opening, an internal stem guide within the axial opening separating the lower flow passageway from an upper cylinder and having a reduced diameter axial opening, a plunger reciprocally positioned within the flow passageway, the plunger having an upwardly extending axial stem received in the stem guide and the plunger having a seaing surface on the lower end, a seating surface within the flow passageway between the inlet ports and the open lower end of the passageway, the seating surface being engaged by the plunger sealing surface when the plunger is in the downward, valve closed, position, a piston positioned in the upper cylinder, the piston being affixed to the upper end of the plunger stem, the body having a small diameter passageway communicating between the body exterior and the cylinder above the stem guide so that fluid pressure may be applied to the small passageway to force the piston and thereby the plunger into an upper, valve open, position, and a spring normally urging the plunger into the downward, valve closed, position, so that loss of actuating fluid will cause the valve to automatically close.

대표청구항 ▼

A safety valve comprising: an upright tubular body having an axial opening therethrough, a portion of the opening at the lower end forming a flow passageway communicating with the lower end and forming an outlet port, the body having inlet ports spaced above the lower end communicating between the f

A safety valve comprising: an upright tubular body having an axial opening therethrough, a portion of the opening at the lower end forming a flow passageway communicating with the lower end and forming an outlet port, the body having inlet ports spaced above the lower end communicating between the flow passageway and the body exterior surface, said inlet ports comprised of a plurality of spaced openings in a common plane, the upper portion of the axial opening forming a cylinder, the body having an internal cylindrical shoulder in the axial opening dividing the lower flow passageway from the upper cylinder; an end cap closing the upper portion of the body axial opening; a cylindrical internal stem guide member removably positioned within said axial opening separating said lower flow passageway and said upper cylinder, and having a reduced diameter axial opening therein; a tubular sleeve received in said cylinder portion of said body axial opening, the lower end of the sleeve engaging said stem guide member and the upper end of said sleeve engaging said end cap whereby said sleeve and stem guide are held in place between said internal shoulder and said end cap; a plunger including a valve means reciprocally supported within said flow passageway, the plunger having an upwardly extending axial stem reciprocally and sealably received in said stem guide member axial opening, the plunger having a sealing surface thereon said valve means provides a recess for receiving a portion of said stem guide when the valve means is in the fully open position; a seating surface within and partially defining said flow passageway, the seating surface being between said inlet port and said lower end outlet port, the valve being closed when said plunger sealing surface engages the seating surface; a piston reciprocally positioned in said upper sleeve, the piston being affixed to the upper end of said plunger stem; a spring compressibly positioned within said sleeve between said piston and said end cap to urge said plunger towards the closed position; and said body having a small diameter passageway communicating between the body exterior and said cylinder above said stem guide means whereby fluid pressure may be supplied through the small passageway to force said piston and thereby said plunger upwardly to open the valve means.