What is a Globe Valve?

 

Valve refers to a valve whose closure (disc) moves along the center line of the seat. According to the movement of the disc, the change of the seat opening is proportional to the disc travel. Because the stem opening or closing stroke of this kind of valve is relatively short and has a very reliable cut-off function, and because the change of the seat opening is proportional to the disc travel, it is very suitable for flow regulation. Therefore, this type of valve is very flexible for cutting or regulating, and throttling. For more at van điều khiển tuyến tính

The globe valve is used for throttling flow control. Shut off is accomplished by moving the disc against the flow stream rather than across it as in the case with a gate valve. The flow pattern through a globe valve involves changes in direction, resulting in greater resistance to flow, causing a high pressure drop. The globe valve is an excellent valve to use in high pressure operation of steam. Our globe valves are factory-made with quality material for long term use.

Globe valve refers to the valve that the plate moves along the center line of the valve seat. According to this form of valve movement, the change of seat opening is proportional to the valve stroke. Because the opening or closing stroke of the stem is relatively short and has a very reliable cutting function, it is very suitable for flow regulation. Globe valves can be divided into external thread type and internal thread type according to the thread. Globe valves can also be divided into the straight type and angle type with the flow direction. Globe valves can also be divided into the straight-flow type and angle type with the flow direction. Globe valves can be divided into packing sealing type and bellow sealing type according to the sealing form.

A globe valve is a linear motion valve used to stop, start, and regulate fluid flow.

A Z-body globe valve is illustrated the globe valve disk can be totally removed from the flow path or it can completely close the flow path.

The essential principle of globe valve operation is the perpendicular movement of the disk away from the seat.

Conventional Globe valves may be used for isolation and throttling services. Although these valves exhibit slightly higher pressure drops than straight=through valves (e.g., gate, plug, ball, etc.), they may be used where the pressure drop through the valve is not a controlling factor.

Because the entire system pressure exerted on the disc is transferred to the valve stem, the practical size limit for these valves is NPS 12 (DN 300). Globe valves larger than NPS 12 (DN 300) are an exception rather than the rule. Larger valves would require that enormous forces be exerted on the stem to open or close the valve under pressure. Globe valves in sizes up to NPS 48 (DN 1200) have been manufactured and used.

Globe valves are extensively employed to control flow. The range of flow control, pressure drop, and duty must be considered in the design of the valve to avert premature failure and to assure satisfactory service. Valves subjected to high-differential pressure-throttling service require specially designed valve trim.

Generally, the maximum differential pressure across the valve disc should not exceed 20 percent of the maximum upstream pressure or 200 psi (1380 kPa), whichever is less. Valves with special trim may be designed for applications exceeding these differential pressure limits. For more at van bi điều khiển khí nén According to the position of the stem, the screw has the external screw type globe valve and the internal screw type globe valve. According to the flow direction of the medium, there are straight-through globe valves, straight-flow globe valves, and Angle globe valves. Globe valve according to seal form, packing seal globe valve, and bellows seal globe valve.