Glove Valve: 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 service. Although these valves exhibit slightly higher pressure drops than straight through valves (gate, plug, ball, etc.), they may be used where the pressure drop through the valve is not a controlling factor.
The practical size limit for these valves is NPS 12. Large valves would require that enormous forces be exerted on the stem to open or close the valve under pressure.
Globe valve 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. Valve subjected to high differential pressure throttling service require a specially designed valve trim.
Maintenance of globe valve is relatively easy since the disks and seats are readily refurbished or replaced. This makes globe valves particularly suitable for services which require frequent valve maintenance. Where valves are operated manually, the shorter disk travel offers advantages in saving operator time, especially if the valves are adjusted frequently.
Advantages of Glove Valve
The main advantage of this arrangement is that a globe valve opens more rapidly than a gate valve as the disc only needs to move a small distance from its seat to allow full flow. This is an advantage when there is frequent operation of the valve.
Precise throttling control. Globe valves are very good at throttling flow, which means that they can be used to precisely control the amount of steam that is flowing through a line. This is important in steam applications where the temperature or pressure of the steam needs to be carefully controlled.
High-pressure applications. Globe valve can be used in high-pressure applications, up to 2000 psi. This makes them a good choice for steam lines that operate at high pressures.
Ease of maintenance. Globe valve are relatively easy to maintain, which is important in steam applications where the valves may need to be opened and closed frequently.
Versatility. Globe valves can be used in a variety of steam applications, including on/off service, throttling service, and pressure relief service.
Disadvantages of globe valve
Higher pressure drop. Globe valves create a higher pressure drop than other types of valves, such as gate valves. This means that there is a loss of pressure as the steam flows through the valve.
More complex design. Globe valves are more complex than other types of valves, which can make them more expensive.
Why glove valve is used
To stop and start the flow of fluids. Globe valves can be used to completely shut off the flow of fluids, making them a good choice for applications where it is important to isolate a section of pipe.
To regulate the flow of fluids. Globe valves can be used to precisely control the flow of fluids, making them a good choice for applications where the flow rate needs to be carefully maintained.
To protect equipment from over-pressure. Globe valve can be used as pressure relief valves, which means that they can be opened to release excess pressure in a system. This can help to prevent damage to equipment from over-pressure.
To mix or blend fluids. Globe valve can be used to mix or blend fluids, making them a good choice for
applications where it is important to ensure that the fluids are evenly mixed.
Boiler feed-water control valves. Globe valve are often used to control the flow of boiler feed-water, which is the water that is used to heat the steam in a boiler.
Steam traps. Globe valve are also used in steam traps, which are devices that are used to remove condensate from steam lines.
Steam pressure regulators. Globe valve are also used in steam pressure regulators, which are devices that are used to maintain a constant pressure of steam in a line.