A globe valve is used to throttle the fluid flowing through the pipeline or to execute multiple, quick, opening/closing operations. A globe valve creates a pressure drop in the pipeline, as the fluid has to flow through an “S-shaped” pathway, and is not recommended for on-off service (a function better covered by gate valves).  Forged bodies are used for smaller sizes globe valves (below 2 inches, generally) and cast steel bodies are used for larger sizes (BS 1873 is the reference specification in this case).

 

A globe valve is used to regulate the flow of cooling water systems and fuel oil systems, for high point vents and low point drains, for boiler vents and drains and heater drains and, feed water, chemical feed, condenser air extraction, for extraction drain systems, for turbines, seal and drains or lube oil systems.

 

Fluid flow through a globe valve, pressure drop

 

GLOBE VALVES BENEFITS AND ISSUES

The benefits of this a globe valve are:

  • Good throttling and shut-off capabilities
  • Easy to maintain and resurface the seats
  • Can be used as a stop-check valve in case the disc is not attached to the stem

The disadvantages are related to the fact that their installation generates a remarkable pressure drop in the pipeline and that the complete shut off of the valve requires a way higher force than gate valves.

(Source: FBV Valve)

 

GLOBE VALVE PRESSURE DROP

As shown in the picture below, the fluid conveyed by the pipeline experiences a pressure drop when passing through this type of valve. This is due to the fact that the flow is not linear, as for gate valves, but “S-shaped”.

 

Globe valve oil & gas

 

GLOBE VALVE KEY SPECIFICATIONS

The most common specifications for globe valves are:

  • BS 1873 (design standard for carbon and alloy steel globe valves with cast body)
  • API 603 (stainless steel globe valves)
  • API 602 (forged steel globe valves)
  • BS EN 12266-1: testing standard
  • ASME B16.10: face to face dimensions for globe valves
  • ASME B16.5 and ASME B16.47: flanged connections
  • ASME B16.25: butt weld connections design
  • ASME B16.34: pressure and temperature ratings by material grade

 

GLOBE VALVE VS BALL VALVE

The key difference between a globe and a ball valve is related to the way they close the fluid passageway: indeed, while a globe valve features a stem that closes against the seat to interrupt the fluid flow, a ball valve has a ball that closes the flow when rotated.

Ball valves are the industry standard for “on/off” applications when no pressure drop is acceptable (similarly to gate valves), whereas globe valves are the industry standard when fluid flow regulation and modulation are necessary.

A globe valve would not be a great on/off valve, as it does not achieve top close-off ratings especially for larger nominal sizes and causes a remarkable pressure drop in the pipeline due to its S-shaped profile, and ball valves are not recommended to regulate the pipeline flow.

Ball valves have long lasting service time as on/off valves, even when repeated and continued opening and closing operations are executed and keep their shut-off capacity even after long years of service.

The conclusion is that piping engineers should specify ball or gate valves for shut-off applications, and should specify globe valves whenever fluid flow regulation is required.

 

GLOBE VALVE VS GATE VALVE

A frequently asked question is what is the difference between gate and globe valves? The main differences are:

  • Flow shut-off capacity: the fluid shut off is the main goal of gate valves, whereas flow throttling is the main goal of globe valves
  • Flow modulation: low for gate valves and high for globe valves
  • Pressure drop in the pipeline: low for gate valves,  appraisable for globe valves
  • Open and closing operation speed: fast for globe valves and rather slow for gate valves

Gate valves cannot be safely used as a replacement for globe valves and, vice-versa.

 

GLOBE VALVE DIAGRAM

GLOBE VALVE GENERAL ASSEMBLY DRAWING

The typical general assembly drawing of a globe valve is shown in this picture:

Globe valve drawing

Several variations of the above design are in any way possible, depending on:

  • body material construction: forged or cast globe valves
  • bonnet design and connection: can be standard or pressure seal (high-pressure gate valves), bolted or welded, etc.
  • ends connection: globe valves are available with multiple valves ends designs (socket weld and threaded for forged globe valves and butt weld for cast body globe valves)
  • disc type
  • stem type (rising/ non-rising)
  • seal type: conical or flat
  • manufacturing norm: API vs EN globe valves have slightly different designs
  • operation: manual, gearbox, actuator
  • etc.

 

GLOBE VALVE DESIGN: STRAIGHT, ANGLE, WYE

The main types of designs for this type of valve are:

  • straight globe valve or “T” type
  • angle globe valve, or “90 degrees”
  • Y pattern globe valve,  or “wye globe valve”

 

globe valve designs

 

GLOBE VALVE SYMBOL

The globe valve symbol is shown in the image below:

Globe valve symbol

 

MATERIALS FOR GLOBE VALVE

BODY MATERIALS

The body for valves below 2 inches is generally made of forged steel (common grades are ASTM A105 for high-temperature service, ASTM A350 for low-temperature service and, ASTM A182 F304/F316 for corrosive service), whereas the bodies for larger bore sizes are made of cast steel (ASTM A216 WCB for high-temperature service, ASTM A351 for low-temperature conditions and ASTM A351 CF8 and CF8M – i.e. SS304 and SS316).

TRIM MATERIALS

The removable and replaceable parts of the valve are collectively defined as “trim”. The API 600 specification foresees a number of standard trim combinations, as illustrated below:

API TRIM # BASE MATERIAL SEAT MATERIAL DISC MATERIAL BACKSEAT
MATERIAL
STEM MATERIAL
1 410 410 410 410 410
2 304 304 304 304 304
3 F310 310 310 310 310
4 Hard 410 Hard 410 410 410 410
5 Hardfaced Stellite Stellite 410 410
5A Hardfaced Ni-Cr Ni-Cr 410 410
6 410 and Cu-Ni Cu-Ni Cu-Ni 410 410
7 410 and Hard 410 Hard 410 Hard 410 410 410
8 410 and Hardfaced Stellite 410 410 410
8A 410 and Hardfaced Ni-Cr 410 410 410
9 Monel Monel Monel Monel Monel
10 316 316 316 316 316
11 Monel Stellite Monel Monel Monel
12 316 and Hardfaced Stellite 316 316 316
13 Alloy 20 Alloy 20 Alloy 20 Alloy 20 Alloy 20
14 Alloy 20 and Hardfaced Stellite Alloy 20 Alloy 20 Alloy 20
15 304 and Hardfaced Stellite Stellite 304 304
16 316 and Hardfaced Stellite Stellite 316 316
17 347 and Hardfaced Stellite Stellite 347 347
18 Alloy 20 and Hardfaced Stellite Stellite Alloy 20 Alloy 20

 

GLOBE VALVE TRIM SELECTION

TRIM RECOMMENDED SERVICE
13% Cr, Type 410 Stainless Steel For oil and oil vapors and general services with heat treated seats and wedges.
13% Cr, Type 410 plus Hardfacing Universal trim for general service requiring long service life up to 1100°F (593°C).*
Type 316 Stainless For liquids and gases which are corrosive to 410 Stainless Steel, up to 1000°F (537°C).*
Monel For corrosive service to 842°F (450°C) such as acids, alkalies, salt solutions, etc.
Alloy 20 For corrosive service such as hot acids -49°F to 608oF (-45°C to 320°C).
NACE Specially treated 316 or 410 trim combined optionally with B7M Bolts and
2HM nuts to meet NACE MR-01-75 requirements.
Full Stellite Full hard faced trim, suitable for abrasive & severe services up to 1200°F (650°C).

GLOBE VALVES DIMENSION

The tables show the dimensions and weights of BS 1873 valves, bolted bonnet type.

Globe valves dimensions

GLOBE VALVE DIMENSION CLASS 150

Dimensions in inches (millimeters)

Sizes L / L1 H (Open) W
2″ 8 (203) 13-3/8 (340) 8-7/8 (225)
2-1/2″ 8-1/2 (216) 14-1/2 (368) 8-7/8 (225)
3″ 9-1/2 (241) 16-1/2 (419) 11-7/8 (302)
4″ 11-1/2 (292) 17-3/8 (441) 12-3/4 (325)
5″ 14 (356) 24 (610) 12-3/4 (325)
6″ 16 (406) 24 (610) 17-3/4 (451)
8″ 19-1/2 (495) 26-3/4 (679) 21-5/8 (549)
10″ 24-1/2 (622) 30 (762) 30 (762)
12″ 27-1/2 (699) 33-7/8 (860) 30 (762)
14″ 31 (787) 56 (1422) 31-1/2 (800)
16″ 36 (914) 64 (1626) 35-1/2 (902)
GEAR OPERATOR RECOMMENDED FOR SIZE 10″ AND ABOVE

 

GLOBE VALVE DIMENSION CLASS 300

Dimensions in inches (millimeters)

Sizes L / L1 H (Open) W
2″ 10-1/2 (267) 13-3/8 (340) 9 (229)
2-1/2″ 11-1/2 (292) 15-3/8 (390) 9 (229)
3″ 12-1/2 (318) 16-1/2 (419) 13 (330)
4″ 14 (356) 19-3/8 (492) 14 (356)
5″ 15-3/4 (400) 21-1/2 (546) 15-3/4 (400)
6″ 17-1/2 (445) 24-3/8 (619) 17-3/4 (451)
8″ 22 (559) 31-1/4 (794) 22 (559)
10″ 24-1/2 (622) 45 (1143) 34 (864)
12″ 28 (711) 49 (1245) 34 (864)
GEAR OPERATOR RECOMMENDED FOR SIZE 8″ AND ABOVE

 

GLOBE VALVE DIMENSION CLASS 600

Dimensions in inches (millimeters)

Sizes L / L1 H (Open) W
2″ 11-1/2 (292) 15-1/2 (394) 9-1/2 (241)
2-1/2″ 13 (330) 17 (432) 11 (279)
3″ 14 (356) 19 (483) 13 (330)
4″ 17 (432) 21 (533) 14 (356)
5″ 20 (508) 25 (635) 15-3/4 (400)
6″ 22 (559) 26-7/8 (683) 18 (457)
8″ 26 (660) 35 (889) 20 (508)
10″ 31 (787) 49 (1245) 24 (610)
12″ 33 (838) 58 (1473) 30 (762)
GEAR OPERATOR RECOMMENDED FOR SIZE 8″ AND ABOVE

 

GLOBE VALVE DIMENSION CLASS 900

Dimensions in inches (millimeters)

Sizes L / L1 H (Open) W
2″ 14-1/2 (368) 20-1/2 (521) 12 (305)
3″ 15 (381) 22-3/4 (578) 14 (356)
4″ 18 (457) 26-1/2 (673) 21-1/2 (546)
6″ 24 (610) 36 (914) 20 (508)
8″ 29 (737) 37 (940) 24 (610)
GEAR OPERATOR RECOMMENDED FOR SIZE 6″ AND ABOVE

 

GLOBE VALVE DIMENSION CLASS 1500

Dimensions in inches (millimeters)

Sizes L / L1 H (Open) W
2″ 14-1/2 (368) 24 (610) 14 (356)
3″ 18-1/2 (470) 26 (660) 16 (406)
4″ 21-1/2 (546) 28 (711) 18 (457)
6″ 27-3/4 (705) 37-1/2 (952) 24 (610)
8″ 32-3/4 (832) 45 (1143) 24 (610)
GEAR OPERATOR RECOMMENDED FOR SIZE 6″ AND ABOVE

 

GLOBE VALVE DIMENSION CLASS 2500

Dimensions in inches (millimeters)

Sizes L / L1 H (Open) W
2″ 17-3/4 (451) 25-1/2 (648) 16 (406)
3″ 22-3/4 (578) 32-1/2 (825) 20 (508)
4″ 26-1/2 (673) 47 (1194) 24 (610)
6″ 36 (914) 70-1/2 (1790) 28 (711)
8″ 40-1/4 (1022) / /
GEAR OPERATOR RECOMMENDED FOR SIZE 6″ AND ABOVE

 

GLOBE VALVE PRICES

Looking for the price of globe valves? Click on the image and check our online globe valves price estimation tool!

price globe valve

The tool estimates the price for cast and forged globe valves manufactured in Europe and Asia.

Even if our price estimates are reliable, prices shall always be double checked with globe valves manufacturers and distributors.

 

BUY AND SELL GLOBE VALVES ONLINE!


buy globe valve

Do you BUY globe valves? 
Take a look at the globe valves for sale of our suppliers (manufacturers, stockists, and distributors), find the valve you need and close the order online in few easy steps. Don’t find what you need? Post a request for quote (RFQ) for globe valves and get offers from trustable vendors!

 

Do you SELL globe valves?
If you are a manufacturer, a stockist or a distributor of globe valves, list your valves and start getting orders from international buyers directly. Over 60.000 people are on Projectmaterials.com every day: what are you waiting for?

 

REGISTER FREE! Start buying and selling globe valves online with one single free account today!