Long stem cryogenic globe valve
Connection type: Flange, Butt welding, Thread
Operation: Hand wheel, bevel gear, Pneumatic, Electric
Medium: liquid nitrogen, liquid ammonia etc.
Working temperature: -196℃≤T≤200℃
Face to face: ANSI B16.10
Flange End: ANSI B16.1
Testing and inspection: API 598
Low temperature globe valve refers to the valve whose closing part (disc) moves along the center line of valve seat. According to the movement of the disc, the change of the valve seat opening is proportional to the disc travel. Because the opening or closing stroke of the valve stem is relatively short, and has a very reliable cut-off function, and because the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for the flow regulation. Therefore, this type of valve is very suitable for cutting off or regulating and throttling.
(1) The structure is simpler than that of gate valve, and the manufacture and maintenance are more convenient.
(2) Therefore, it is not easy to wear and tear the sealing surface between the valve body and the sealing surface, so it is not easy to wear and tear with the valve body sealing surface.
(3) When opening and closing, the stroke of the disc is small, so the height of the stop valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve.
(4) The opening and closing torque is large, and the opening and closing time is long.
(5) Due to the tortuous medium channel in the valve body, the fluid resistance is large and the power consumption is large.
(6) When the nominal pressure PN ≤ 16MPa, the forward flow is generally adopted, and the medium flows upward from the lower direction of the valve disc; when the nominal pressure PN ≥ 20MPa, the reverse flow is generally adopted, and the medium flows downward from the upper direction of the valve disc, so as to increase the sealing element energy. In use, the medium of the stop valve can only flow in one direction, and the flow direction cannot be changed.
(7) When the valve is fully opened, the valve disc is often eroded.