Globe Valves

GLOBE VALVES

Globe valves are valves types used to regulate, start, or stop fluid flow in systems. Globe valves are made following the API 602 and ASME B16.34 standards. Globe valves are low pressure valves used in many applications and industries. The valve is designed with a movable disc joined to the valve stem which allows for easy regulation of fluid flow in systems.

Globe valves are available in sizes ranging from 3/4” to 6” and can work with pressure ranging from 150# to 800#. Globe valves are made from materials such as cast iron, cast steel, forge steel A105 and stainless steel SS316. The connection types for globe valves are welded end socket weld, 150# flange end, threaded end (BSPP and NPT), and JIS 10K flange end.

Material Specification	Forged Steel A105 Cast Iron Cast Steel Stainless steel SS316
Connection Type	Welded End Socket Weld 150# Flange End Threaded End (BSPP / NPT) JIS 10K Flange End
Size	3/4” to 6”
Working Pressure	150# 200# 800#

Globe Valves Specifications

To learn more about individual product specification, please read the details below:

ANSI 150# SS316 Globe Valve

JIS 10K SS316 Globe Valve

Threaded End SS316 Globe Valve (200PSI)

Threaded End SS316 Globe Valve (800PSI)

ANSI 150# Cast Iron Globe Valve

JIS 10K Cast Iron Globe Valve

ANSI 150# Cast Steel Globe Valve

ANSI 150# Forged Steel Globe Valve

Threaded End Forged Steel Globe Valve

Welded End Forged Steel Globe Valve

1. What are Globe Valves?

Globe valves are made following API 602 and ASME B16.34 standards and are classified as the most renowned valves available. Globe valves as linear motion valves can control, shut down, or open a system's fluid flow. The globe valve has an outside structure resembling a globe, hence, the name it’s called.

Globe valves are designed with a disc that moves perpendicular to the flat surface of the valve seat. This angular contact between the disc and valve seat gives an improved sealing and reduces susceptibility to leakages. When the valve is at an opened position, process fluid flows through a middle seat hole. However, the valve reduces the flow rate by changing the gap between the movable disc and seat.

Regular valves or globe valves have been designed before modern times and they are applied in throttling and isolation systems. The globe valves have their body halves structured in a spherical shape and divided by an inner baffle. Today, many globe valves have been restructured to other shape asides from the conventional valves' spherical shape.

The disc in globe valves is produced in different types. These types are shown in the table below:

Needle Type	Variety flow conditions The better throttling amongst ball type and composite type A wide variety of long and tapered disc is available
Ball Types	Capable of throttling flow The most common type Low temperature application Low pressure application
Composition Type	Disc is replaceable Applicable in steam and hot Resilient to close on solid particles with maintaining the valve condition Hard, non-metallic insert ring on the disc to create tight closure Erosion resilient

2. How does a Globe Valve operate?

Like other valves, the globe valve body is inscribed with a flow direction arrow to guide and indicate the inlet and outlet ports. The fluid flow in the globe valves is unidirectional and connected with the inlet or pressure side placed under the valve seat. The globe valve has many major components which are discussed below:

Ansi 150# SS316 Flange End Globe Valve

Valve Body: The body of the globe valve is the major pressure function and the simplest to spot because it carries the valve's major weight. It comprises all other inner important components that contribute to the functioning and control of the valve. The body is attached to the valve's bonnet and serves as a restraint for the fluids and gases being regulated.
Bonnet: the bonnet is available in a variety of options which are bolted, screw-in, or union bonnet. The bonnet contributes to the leak-proof termination for the body. The screw-in bonnet is the easiest and renowned bonnet type. More so, it gives a pressure-tight and long-lasting sealing. Union bonnet is designed for systems requiring periodic inspection, maintenance, and cleaning. The bolt connected to the bonnet makes it suitable for high pressure systems. The bonnet also sustains the seal applied between steam and the bonnet during fluid flow.
Disc or Plug: the discs are controlled for flow throttle. They are attached to the stem through the screwing or sliding method. Plugs are available in two types; balance and unbalance plugs. The unbalanced plugs are firm and used for small valves with low pressure drops during operation. The plugs are cost-effective, easy to use, and have reduced leakages. Specifically, there’s only one possible leak passage from the seat. One major drawback of an unbalanced plug is the restriction in available sizes of the plugs.

For balanced plugs, they are simpler to close due to the holes designed on the plug. A leak passage may occur between the cage and plug.

Stem: the stem is a connecting device from the handwheel handle to the valve's inner part. They can be used for manual threaded valves or valves controlled with actuators. The smooth stems are encompassed with packing material to avoid fluid leakage. This material is prone to wear and can be easily changed during maintenance of the valve. The smooth stem gives the threaded ends the allowance to connect to the handwheel plug.
Seat: the seat ring gives a uniform, replaceable, and stable shut-off area, and it is connected by screwing in or torque.

BAHASA INDONESIA

3. How does a Glove Valve work?

There are several design types for the globe valve body. However, the most popular types are the angle type, Z-type, and Y-type.

Z-type or Tee Pattern: this is the easiest and most popular type. The globe valve body is partitioned internally in a Z-shape and this houses the valve seat. The straight seating arrangement gives the stem and disc the allowance to move vertically to the pipe axis which causes a huge loss of pressure. The seat is easily reachable via the bonnet and connected to a large opening at the peak of the valve. However, this drop in pressure does not disturb the operation of the valve because throttling is needed.
Y-type/Wye Pattern: the Y-type is designed as a way out for the high pressure drop problem that occurs in the Z-type. For the Y-type, the seat and stem are positioned at precisely 45-degrees to the pipe axis.
Angle Type: the angle type is used to turn flow direction to 90-degrees. This is a singular act by the angle type as no additional tools such as elbow or extra pipe welding connector is needed.

NPT Globe Valve A105

4. Where is a Globe Valve used for?

Ansi 150# SS316 Flange End Globe Valve

The globe valve is used in a variety of applications such as:

Cooling water system
Turbine drains and seals
Low point drains and high point vents
Chemical feed, condenser air extraction, extraction drain systems, and feed water
Fuel oil system where the flow is controlled and leak-proof flow is important
Heater drains, boiler vents and drains, and mainstream vents.

The benefits of applying globe valves in system installation include:

Throttling capability
Easy repair of disc and seal
Globe valves are designed with smaller stroke length and this allows for swift operation
Produced in various angles types such as angle, Y, and Z angle types
Designed to be used for throttling flow regulation