What is Globe Valve?

A globe valve is a linear motion valve used to stop, start, or regulate fluid flow.
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What is Globe Valve?

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

This feature gives the globe valve the throttling capability needed to regulate flow.

Globe valve types

Based on disk layout type

• Type of ball
• needle type

Based on body type

• Globe valve type Z
• Y type globe valve
• Angle Type Globe Valve

Based on connection type Bonnet Body

1-Screw hood

2- Welded hood

3-Screw hood

4- Pressure seal hood

Globe valve components

• Handwheel
• Stem
• Hood
• Packing
• Washer
• disc peduncle
• disk or fork
• Body
• chair

Handwheel

The role of the handwheel is to rotate the stem and insert or remove the plug from the seat, which activates or deactivates the fluid flow.

A valve actuator is an example of a handwheel (the part that controls the movement of the stem and disc).

It is outside the pressure boundary (the pressure caused by the fluid inside the pipe and valve) and hence it is subjected to the pressures that are applied to it only when the valve is working, i.e. the torque produced by turning the handwheel.
Stem

The stem transmits rotary motion from the trolley to the plug, and the power screw on it converts the rotary motion of the trolley into a vertical motion, seating the disc and blocking the flow opening.

The valve stem is attached to the handwheel via four smooth edges at the top and is screwed into the lead screw, which is then locked in place with a nut.

At the bottom, the fork is screwed to the stem and secured with a disc base nut. As a result, the electric screw exerts torsional stresses on the stem.

Globe valve hood

The hood is the part of the valve that closes the opening.

It is a pressure-bearing part that holds the full pressure of the fluid as it passes through the valve body as service loads.

A nail nut holds it in place.

It also serves as a support for the tube, and in this case, it is made of bronze.

The cap is usually made of the same material as the valve body.

واشر

Gaskets are static seals in a joint that expand to fill material imperfections when clamped over its surfaces.

They can be made from materials like Teflon or compressed paper, like the one we looked at, that have non-absorbent bonding agents.

As the gasket is subjected to seawater pressure and wear, it will most likely need to be replaced during the life of the valve.

A tensile stress test on the gasket should be performed to determine where the material breaks.

Gaskets are also subjected to a test known as the “hot compression test”.

They are evaluated in which the gasket is crushed in a hydraulic press and the temperature is increased while the thickness of the gasket is measured.

Disc peduncle

The stem is connected to the fork by the disc stem nut.

The thread secures it to the disc, while the wider plate of the stem holds the screw in place.

When screwed, the disc presses against the wider hexagonal plate of the disc stem nut.

It will have service loads on its threads, it will be compressed when the valve is closed and exposed to the full pressure of the fluid flowing through the valve.

This part, like the rest of the parts in contact with sea water, is made of bronze, but stainless steel may be used instead.

disk or fork

The function of the plug is to prevent the valve from opening, allowing or restricting fluid flow.
It screws into the stem nut of the disc, which secures it to the stem. As it descends, it compresses the seat and restricts flow.

The plug withstands the full pressure of the fluid passing through the valve and must form a tight seal with the seat.

While the thread bears the load of the fluid pressure that exerts upward pressure on it.

Since it will be in contact with seawater, it will be made of bronze and stainless steel will be used as an alternative material.

The edges are machined to ensure a secure fit with the seat.

It should be tested for yield point under pressure and thread strength as well as the maximum force it can withstand as a load.

Globe valve body

The valve body acts as the framework to which all other components are attached.

This is the main pressure boundary of the valve, which means that it bears the full weight of the pressure of the fluid flowing through the valve, as well as the loads of the pipes connected to it.

It acts as a container for fluid flow and accepts fluid input and output.

The valve body is sand casting and the side is turned for sealing and gasket connection.

Both sides are machined to accommodate screws well.

This piece is milled perfectly to fit the hood and provides a pilot hole and a flat seat for the nuts.

chair

The seat or seat is the part where the plug is placed, and in the valve for this study, the seat is integrated into the body. to be
It is machined and must maintain an impenetrable seal with the disc. The seat is tested next to the body.

Globe milk advantages and disadvantages

Advantages Globe Valve

• Good for repeated operation as seat and disc do not wear out.
• Repair is easy because the seat and disc are accessible from above the valve.
• Because of its shorter stroke length, it can be operated faster than butterfly valve a> launched.
• Typically operated by an automatic actuator

Disadvantages Globe Valve

• Two or more rotations at a right angle from the flowing fluid in the valve body cause a lot of fluid loss.
• High head drop is caused by blockage and discontinuity in the flow path.
• Big globe valves need a lot of electricity to open and make noise during operation.
• High weight compared to other valves with the same pressure rating.
• Ezgate is even more expensive.

Buy Globe Valve

To buy Globe Velo, you should pay attention to things such as the credibility of the store, having a warranty, after-sales service, etc.

All products of Kiasanat have 18 months warranty and after-sales service.
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