A fluid transfer device comprising: a body formed of: a first section having a first end containing a first opening, a flange surrounding the first opening for attaching the body to an upstream component, and a body groove on the inner surface of the first section of the body; a second section rotatably engaged with the first section and having a second end containing a second opening; and a bore located in the interior of the body connecting the first and second openings (16, 18); a linearly movable plunger contained within the bore having: a plunger groove, a first portion containing a first opening and a bottom end, wherein the bottom end being in alignment with the flange surrounding the first opening of the body forms a fluid-resistant seal and a steamable face, a second portion containing a second opening, and a fluid channel located in the interior of the plunger connecting the first and second openings (66, 64) of the plunger; and a linear or gland seal arranged along a length of the plunger downstream of the first opening of the plunger, the linear or gland seal being retained within the body groove and within the plunger groove; wherein the plunger is linearly movable between a closed position and an open position by rotating the second section of the body; and the device is in the closed position when the bottom end of the plunger is in alignment with the flange surrounding the first opening of the body. a body formed of: a first section having a first end containing a first opening, a flange surrounding the first opening for attaching the body to an upstream component, and a body groove on the inner surface of the first section of the body; a second section rotatably engaged with the first section and having a second end containing a second opening; and a bore located in the interior of the body connecting the first and second openings (16, 18); a linearly movable plunger contained within the bore having: a plunger groove, a first portion containing a first opening and a bottom end, wherein the bottom end being in alignment with the flange surrounding the first opening of the body forms a fluid-resistant seal and a steamable face, a second portion containing a second opening, and a fluid channel located in the interior of the plunger connecting the first and second openings (66, 64) of the plunger; and a linear or gland seal arranged along a length of the plunger downstream of the first opening of the plunger, the linear or gland seal being retained within the body groove and within the plunger groove; wherein the plunger is linearly movable between a closed position and an open position by rotating the second section of the body; and the device is in the closed position when the bottom end of the plunger is in alignment with the flange surrounding the first opening of the body. a first section having a first end containing a first opening, a flange surrounding the first opening for attaching the body to an upstream component, and a body groove on the inner surface of the first section of the body; a second section rotatably engaged with the first section and having a second end containing a second opening; and a bore located in the interior of the body connecting the first and second openings (16, 18); a linearly movable plunger contained within the bore having: a plunger groove, a first portion containing a first opening and a bottom end, wherein the bottom end being in alignment with the flange surrounding the first opening of the body forms a fluid-resistant seal and a steamable face, a second portion containing a second opening, and a fluid channel located in the interior of the plunger connecting the first and second openings (66, 64) of the plunger; and a linear or gland seal arranged along a length of the plunger downstream of the first opening of the plunger, the linear or gland seal being retained within the body groove and within the plunger groove; wherein the plunger is linearly movable between a closed position and an open position by rotating the second section of the body; and the device is in the closed position when the bottom end of the plunger is in alignment with the flange surrounding the first opening of the body.