What is the difference between globe valve and control valve?
Globe valves are good for regulating flow, whereas ball valves are better for on/off control without pressure drop. For decades globe valves were considered the industry standard in control valves. They are designed with a stem that moves up and down inside the valve to control flow.
What are the three types of globe valves commonly found?
There are three basic globe valve body designs: Tee, Angle, and Wye.
- Tee. This is the most common body type for a globe valve.
- Angle. The ends of this globe valve are at a 90° angle allowing fluid to flow in a single 90° turn.
- Wye. This type is an alternative for the high pressure drop commonly found in globe valves.
What is globe control valve?
A globe valve is one of the most common types of control valve. Globe valves have sphere-shaped bodies. Inside the valve, a baffle separates two halves. This internal structure creates a different flow path than ball valves and other rotary-type valves. Globe valves actuate in a linear movement.
What is a disadvantage of a globe valve?
DISADVANTAGES: Higher pressure drop (compared to a gate valve) Requires greater force or a larger actuator to seat the valve (with pressure under the seat) Throttling flow under the seat and shutoff flow over the seat.
When would you use a globe valve?
Globe valves are used primarily in situations where throttling of the commodity is required. By simply rotating the handwheel, the rate at which the commodity flows through the valve can be adjusted to any desired level. Having the valve seat parallel to the line of flow is an important feature of the globe valve.
What is another name for a globe valve?
Globe valves are also known as throttle valves.
What material is a globe valve made of?
In cast-iron Globe valves, disc and seat rings are usually made of bronze. In steel-Globe valves for temperature up to 750°F (399°C), the trim is generally made of stainless steel and so provides resistance to seizing and galling.
Why are globe valves used?
Unlike the gate valve, globe valve can be used for regulating flow or pressures as well as complete shutoff of flow. It may also be used sometime as a pressure relief valve or as a check valve. Compared with a gate valve or ball valve, the globe valve has considerably higher pressure loss in the fully open position.
What are globe valves made of?
Is globe valve non return?
Uses: Globe valve is used in applications where variable pressure is required in the pipeline such as emergency bilge suction line etc. It can also be used as a non return valve. The type of valve where the disc is not attached to the spindle is called screw down non-return valve.
What is the advantage of globe valve?
When compared to a gate valve, a globe valve generally yields much less seat leakage. This is because the disk-to-seat ring contact is more at right angles, which permits the force of closing to tightly seat the disk. Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow.
What materials are globe valves made of?
Do globe valves have a flow direction?
Flow Direction through Globe Valves Globe valve have specific flow directions. Depending on the application, a globe valve will have fluid flow above or below the disc. Globe valves can be arranged so that the disk closes against or in the same direction of fluid flow.
What are the types of control valves?
The two types of control valves are linear motion and rotary motion.
What are the applications of a globe valve?
Typical globe valve applications Cooling water systems. Fuel oil systems. Feedwater or chemical feed systems. Boiler and main steam vents and drains.
What material is used for valves?
|Bronze / Brass
|Bronze (CAC401) Brass (C3771)
|K metal (C3531) Stainless steel
|Gray cast iron (FC200)
|Ductile iron castings (FCD-S)
|Carbon steel castings for high temperature / pressure service (SCPH 2)
Does a globe valve have a rising stem?
Globe valves usually have rising stems, and the larger sizes are of the outside screw-and-yoke construction. Components of the Globe valve are similar to those of the gate valve. This type of valve has seats in a plane parallel or inclined to the line of flow.