Pars Regulator Corp. Globe Valve

Globe Valve

Forged Steel Globe Valve

Features and benefits
● A compact but extremely sturdy design for high pressure-temperature service.
● Available types: Stop, Stop check, Needle, Flow control.
● Available with bolted or welded bonnet.
● Packing rings are pre-compressed to 4000 psi to provide a high integrity seal.
● Repairable 2-piece stem drive.
● Available with double packing, leak-off connection, and live-loading. 

Size range(s)
NPS 1/4 – 2 (DN 8 – 50)
Pressure rating

ASME Class 150 – 1500
Standard connections
Threaded, Socket weld, Flanged

Globe Valve BS 1873 and API 602

What is a globe valve? When shall it be used instead of gate and ball valves? In this article, we illustrate the scope of this type of valve (which is, in a word, to regulate the flow), the differences with other types of valves, the alternative designs, and specifications (BS 1873 for the cast steel and API 602/BS 5352 for the forged steel type).


Globe valves are used to regulate the flow of a fluid and to shut-off the fluid (even if ball valves and gate valves are always preferred for shut-off operations). Globe valves are bi-directional valves, differently from check valves, meaning that the fluid can flow either way within the valve.

The image illustrates how the valve works and its main components: the flow is managed via a disc that can be lifted (manually or via actuators) from the seat, thus regulating the volume of the allowed flow.

Fluid flow through a globe valve, pressure drop

The key specifications for globe valves used for piping applications in the petrochemical industry are:

  • BS 1873: cast steel valves
  • API 603: stainless steel valves
  • API 602/BS 5352: forged steel valves
  • API 598 and BS EN 12266-1: valves testing
  • ASME B16.10: face to face dimensions for 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 ADVANTAGES AND Disadvantages The advantages 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 main disadvantages are:

  • the valve creates a pressure drop in the piping system (different from gate valves): this is since the flow of the fluid is not linear inside the valve, which has an “S-shaped” passageway (see the image below)
  • shut-off requires more torque than gate valves
Globe valve disadvantage: pressure drop


The valve is available in three main types, considering the shape of the body:

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

The globe valve symbol in P&ID diagrams is the following:  Globe valve symbol


The key difference between a globe and a ball valve is that a ball valve is designed for shut-off operations, whereas a globe valve is designed to throttle fluids. These two valves are industry-standards respectively for shut-off (ball valve) and for regulation (globe valve) applications.

A globe valve does not fit shut-off operations, due to the pressure drop it creates in the piping system (a problem that does not exist for full bore ball valves).

Ball valves have a long service life even in case of continuous on-off operations; globe valves would deteriorate easily under this type of service.


The main differences between these two valves are:

  • fluid shut off is the main goal of gate valves, whereas flow throttling is the main goal of globe valves
  • gate valves have poor, to none, fluid regulation capacity
  • gate valves do not generate a pressure drop in the pipeline, globe valves do
  • globe valves open faster than gate valves

Concluding on this topic: use a ball valve (or a gate valve) for shut-off operations; use a globe valve for regulation. Do not consider these valves as interchangeable.

Globe valve


A general assembly drawing for globe valves is shown in the image:

Globe valve drawing

Nonetheless, a large number of variations exist, depending on the following factors:

  • body material: cast (BS 1873) and forged (API 602/BS 5352)
  • bonnet design: standard or pressure seal type (for high-pressure applications)
  • bonnet to body connection: bolted or welded
  • valve end connections type: flanged (as shown in the image), buttweld, socket weld/threaded (forged bodies)
  • disc type
  • stem type (rising/non-rising)
  • seal type: conical or flat
  • specification: BS, API, EN
  • type of actuation: manual, with a gearbox, with an actuator