Globe Valve Symbol – ZECO Valve

Globe Valve Symbol

Jerry — Wed, 29 Dec 2021 06:50:36 +0000

What is the Symbol for Globe Valve?

For a globe valve, a symbol is modified by adding a small dark circle between triangles. You can see that P&ID and isometric symbols are almost the same, with the only change in end types.

Universal Globe Valve Symbol

The symbol for a globe valve is two sideways triangles on the same linear line with the points touching in the middle. Where the points touch, there’s a black circle.

Angle Globe Valve Symbol

Globe valves can also be made to work at angles. If you see two triangles with points touching in an ” L” configuration and a black circle where the points meet, that indicates an angled globe valve.

When will You See Globe Valve Symbols?

Globe valves regulate flow in a single linear direction. When in the open position, the valve allows flow. In the closed position, it stops the flow.

They operate with excellent precision, more than similar gate valves, and they also close and open with a shorter stroke than similar valves.

They’re most often used in cooling systems, fuel lines, turbine lube oil systems, steam lines/systems, and water systems.

What is a Globe Valve Used for?

Unlike the gate valve, the globe valve can be used for regulating flow or pressures as well as complete shutoff of flow. It may also be used sometimes 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.

How to Solve the leakage of the Globe Valve?

Internal leakage is usually damage to the valve seat or the sealing surface of the valve plug. This can grind the seat or the sealing surface of the valve plug, but there is still
An ad hoc condition may be that the valve stroke is not set if it is electric or pneumatic. What is the central leak,
If the valve body leaks, only the valve can be changed.
If the inner leakage is a problem, the sealing surface should be a problem. If the sealing surface is disposed of to see if the result leaks out, the valve is divergent, and the leaking position is different. If the leakage at the filling point is to be treated differently, close or change the packing, we cannot Parking is done with pressure plugging.
The external leakage is also beneficial to handle. Regarding the leakage of the middle flange, tighten the bolt of the middle flange again. If it is not enough, open it.
Look at the damage of the middle flange gasket. Regarding the leakage at the packing, it is necessary to press the packing gland. If the packing is too loose, it is necessary to
Add filler, if it is directly leaking on the body, if it is low pressure, it can be welded. If it is high pressure, just abandon it.
Ping An first, about the problem of internal leakage, the situation is not good, first, may not be shut down, and then shut down
Second, the valve seat seal is damaged, this must be re-grinded. Regarding the damage of the valve core, it is necessary to wash the damage.
Damaged by media impact, but both must be re-welded to the sealing surface.
There are many leakage points in the forged steel stop valve. Most of the external leakage is leaking from the gland, and the gland is opened or added.
The packing should be tightened and the gland should not be leaked. The inner leak is that the sealing surface on the inside of the inner spool is broken, but the practice is
The calendar informs us that some time leaks may be caused by a hard object stuck on the valve core, forming an internal leak, detailed disposal methods
It is necessary to open the valve and close it, and then it will be able to wash away the hard object several times.

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What is a Globe valve – Globe Valve Types | Globe Valve Manufacturer

Jerry — Mon, 27 Dec 2021 10:06:22 +0000

What is a Globe Valve?

A globe valve is a linear motion valve that stops, starts, and regulates fluid flow. The globe valve disk can be removed entirely from the flow path, or it will completely close the flow path. During the opening and closing of the valve, the disc moves perpendicularly to the seat.

This movement creates the annular space between the disk and seat ring that gradually closes as the valve closes. This characteristic provides the globe valve good throttling ability required for regulating the flow.

Leakage from the globe valve seat is less as compared to the gate valve, mainly due to right-angle contact between the disc and seat ring, which allows a tighter seal between the seat and the disk.

Globe Valve Image

Globa Valve Function

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 the high-pressure operation of steam. Our globe valves are factory-made with quality material for long-term use.

Globe Valve Working Principle

A globe valve is primarily designed to stop, start and regulate flow. It is comprised of a movable disk and a stationary ring seat in a generally spherical body. The seat of a globe valve is in the middle of and parallel to the pipe, and the opening in the seat is closed off with the disk. When the handle is turned, manually or through an actuator, a disc is lowered or raised by means of the valve stem. When the disc is fully lowered, the fluid flow is shut off. When the disc is fully raised, the fluid flow is at its maximum rate. When the disc is in raised to less then maximum level, the fluid flow is regulated with proportion to the vertical travel of the disc.

Globe Valve Types

Body Designs of Globe valves

There are three primary body designs for Globe valves, namely. Tee Pattern or Z-body, Angle Pattern, and Wye Pattern or Y-body body.

Tee Pattern Globe Valve
- Tee Pattern Globe valve(T pattern globe valve) design is the most common body type, with a Z-shaped diaphragm. The horizontal setting of the seat allows the stem and disk to travel perpendicular to the horizontal line. This design has the lowest coefficient of flow and higher pressure drop. They are used in severe throttling services, such as in bypass lines around a control valve. Tee-pattern Globe valves may also be used in applications where pressure drop is not a concern and throttling are required.

Angle Globe Valve
- The angle Pattern Globe valves(Angle globe valve) design is a modification of the basic Tee Pattern Globe valve. The ends of this Globe valve are at an angle of 90 degrees, and fluid flow occurs with a single 90 degrees turn. They have a slightly lower coefficient of flow than wye-pattern Globe valves. They are used in applications that have periods of pulsating flow because of their capability to handle the slugging effect of this type of flow.

Wye Pattern Globe Valve (Y Type Globe Valve)
- Wye Pattern Globe valves(Y-type globe valve) design, is an alternative for the high-pressure drop, inherent in Globe valves. The seat and stem are angled at approximately 45 degrees, which gives a straighter flow path at full opening and offers the least resistance to flow. They can be cracked open for long periods without severe erosion. They are extensively used for throttling during seasonal or startup operations. They can be rod through to remove debris when used in drain lines that are normally closed.

Bonnet Design of Globe Valves

There are three primary bonnet designs for Globe valves, namely.. screwed bonnet, bolted bonnet, welded bonnet, or pressure seal bonnet.

Screwed Bonnet Globe Valve
- Screwed bonnet: This is the most basic design possible, and it is utilized for low-cost valves.
Bolted Bonnet Globe Valve
- Bolted-bonnet: This is the most common design and is seen in the majority of globe valves. A gasket is required to seal the junction between the body and the bonnet.
Welded Bonnet Globe Valve
- Welded-Bonnet: This is a common design that does not need disassembly. They weigh less than their bolted-bonnet equivalents.
Pressure Seal Bonnet Globe Valve
- Pressure-Seal Bonnet: This kind is commonly employed in high-pressure, high-temperature applications. The greater the pressure in the body cavity, the greater the strain on the gasket of a pressure-seal valve

Globe Valve Parts

A globe valve has several key parts:

Bonnet:
- The bonnet is the outer part of the valve, which encompasses these other parts.
Cage:
- The cage surrounds the stem within the valve.
Stem:
- The stem connects the disk to the valve actuator or handwheel, transmitting the force.
Disk (Plug):
- The part of the globe valve that moves perpendicular to the seat. It’s the moveable physical barrier that blocks (or frees) the flow. When closed, the disk sits against the seat, plugging the flow. When opened, the disk sits above the seat, allowing liquid to pass.
- Types of Disc
  - Ball Disc – suitable for low temperatures and low pressures. Ideal for starting and stopping operations. Ill-suited for flow regulation.
  - Composition Disc – composites by definition consist of several components. The disc is almost always manufactured from metal whilst a non-metallic ring is mounted onto the disc to form the seating area. The non-metallic ring material is chosen to have good corrosion and erosion characteristics and may be custom-made to ensure it is fit for purpose. If the non-metallic ring is chosen correctly, it should allow for better sealing. Composite discs are often employed for steam system applications.
  - Plug Disc – plug discs have a long and tapered shape. The shape of the plug disc makes it much more suitable to throttling than the composite and ball disc-type designs.
Seat (Seat ring):
- This part of the valve provides the seal between the stem/disk and bonnet when the disk is tightly pressed against it. It’s either integrated or screwed into the valve itself.

Globe Valve Symbol

The symbol for a globe valve is two sideways triangles on the same linear line with
the points touching in the middle. Where the points touch, there’s a black circle. You
can see a picture of it here.

For applications with low temperatures, Globe valves are normally installed so that the pressure is under the disc. This contributes to an easy operation and helps protect the packing.

For applications with high-temperature steam service, Globe valves are installed so that the pressure is above the disk. Otherwise, the stem will contract upon cooling and tend to lift the disk off the seat.

Globe Valve Application

The following are some of the typical applications of Globe valves:

Cooling water systems where flow needs to be regulated
Fuel oil system where flow is regulated and leak tightness is of importance
High-point vents and low-point drains when leak tightness and safety are major considerations
Feedwater, chemical feed, condenser air extraction, and extraction drain systems
Boiler vents and drains, main steam vents and drains, and heater drains
Turbine seals and drains
Turbine lube oil system and others

Advantages and Disadvantages of Globe Valve

Advantages
- Good shutoff capability
- Moderate to good throttling capability
- Shorter stroke (compared to a gate valve)
- Available in tee, wye, and angle patterns, each offering unique capabilities
- Easy to machine or resurface the seats
- With the disc not attached to the stem, the valve can be used as a stop-check 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